replace github url

Breaks OIDC for some not yet updated applications, that we use.

This reverts commit c51628ea27.

.forgejo.bak/ISSUE_TEMPLATE/bug_report.yaml

@@ -2,6 +2,7 @@ name: Bug Report
 description: "Create a bug report to help us improve ZITADEL. Click [here](https://github.com/zitadel/zitadel/blob/main/CONTRIBUTING.md#product-management) to see how we process your issue."
 title: "[Bug]: "
 labels: ["bug"]
+type: Bug
 body:
   - type: markdown
     attributes:

.forgejo.bak/ISSUE_TEMPLATE/docs.yaml

@@ -1,6 +1,7 @@
 name: 📄 Documentation
 description: Create an issue for missing or wrong documentation.
 labels: ["docs"]
+type: task
 body:
   - type: markdown
     attributes:

.forgejo.bak/ISSUE_TEMPLATE/enhancement.yaml

@@ -1,11 +1,12 @@
 name: 🛠️ Improvement
 description: "Create an new issue for an improvment in ZITADEL"
-labels: ["improvement"]
+labels: ["enhancement"]
+type: enhancement
 body:
   - type: markdown
     attributes:
       value: |
-        Thanks for taking the time to fill out this improvement request
+        Thanks for taking the time to fill out this proposal / feature reqeust
   - type: checkboxes
     id: preflight
     attributes:

.forgejo.bak/dependabot.yml

@@ -9,6 +9,16 @@ updates:
   commit-message:
     prefix: chore
     include: scope
+- package-ecosystem: gomod
+  target-branch: "2.12.x"
+  directory: "/"
+  schedule:
+    interval: daily
+    time: '04:00'
+  open-pull-requests-limit: 10
+  commit-message:
+    prefix: chore
+    include: scope
 - package-ecosystem: "github-actions"
   directory: "/"
   schedule:

.forgejo.bak/workflows/codeql-analysis.yml

@@ -29,7 +29,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v3
       # Override language selection by uncommenting this and choosing your languages
       with:
         languages: go
@@ -37,7 +37,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@v3
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -51,4 +51,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v3

.forgejo.bak/workflows/issue.yml

@@ -0,0 +1,43 @@
+name: Add new issues to product management project
+
+on:
+  issues:
+    types:
+      - opened
+  pull_request_target:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue and community pr to project
+    runs-on: ubuntu-latest
+    steps:
+      - name: add issue
+        uses: actions/add-to-project@v1.0.2
+        if: ${{ github.event_name == 'issues' }}
+        with:
+          # You can target a repository in a different organization
+          # to the issue
+          project-url: https://github.com/orgs/zitadel/projects/2
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - uses: tspascoal/get-user-teams-membership@v3
+        id: checkUserMember
+        if: github.actor != 'dependabot[bot]'
+        with:
+         username: ${{ github.actor }}
+         GITHUB_TOKEN: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - name: add pr
+        uses: actions/add-to-project@v1.0.2
+        if: ${{ github.event_name == 'pull_request_target' && github.actor != 'dependabot[bot]' && !contains(steps.checkUserMember.outputs.teams, 'engineers')}}
+        with:
+          # You can target a repository in a different organization
+          # to the issue
+          project-url: https://github.com/orgs/zitadel/projects/2
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - uses: actions-ecosystem/action-add-labels@v1.1.3
+        if: ${{ github.event_name == 'pull_request_target' && github.actor != 'dependabot[bot]' && !contains(steps.checkUserMember.outputs.teams, 'staff')}}
+        with:
+          github_token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+          labels: |
+            os-contribution

.forgejo.bak/workflows/release.yml

@@ -14,25 +14,25 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
-        go: ['1.19', '1.20', '1.21']
+        go: ['1.23', '1.24']
     name: Go ${{ matrix.go }} test
     steps:
       - uses: actions/checkout@v4
       - name: Setup go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
       - run: go test -race -v -coverprofile=profile.cov -coverpkg=./pkg/... ./pkg/...
-      - uses: codecov/codecov-action@v3.1.4
+      - uses: codecov/codecov-action@v5.4.3
         with:
           file: ./profile.cov
           name: codecov-go
   release:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs: [test]
     if: ${{ github.event_name == 'workflow_dispatch' || github.ref == 'refs/heads/main' || github.ref == 'refs/heads/next' }}
     env:

.github/ISSUE_TEMPLATE/proposal.yaml

@@ -1,44 +0,0 @@
-name: 💡 Proposal / Feature request
-description: "Create an issue for a feature request/proposal."
-labels: ["enhancement"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for taking the time to fill out this proposal / feature reqeust
-  - type: checkboxes
-    id: preflight
-    attributes:
-      label: Preflight Checklist
-      options:
-      - label:
-          I could not find a solution in the existing issues, docs, nor discussions
-        required: true
-      - label:
-          I have joined the [ZITADEL chat](https://zitadel.com/chat)
-  - type: textarea
-    id: problem
-    attributes:
-      label: Describe your problem
-      description: Please describe your problem this proposal / feature is supposed to solve.
-      placeholder: Describe the problem you have.
-    validations:
-      required: true
-  - type: textarea
-    id: solution
-    attributes:
-      label: Describe your ideal solution
-      description: Which solution do you propose?
-      placeholder: As a [type of user], I want [some goal] so that [some reason].
-    validations:
-      required: true
-  - type: input
-    id: version
-    attributes:
-      label: Version
-      description: Which version of the OIDC Library are you using.
-  - type: textarea
-    id: additional
-    attributes:
-      label: Additional Context
-      description: Please add any other infos that could be useful.

.github/workflows/issue.yml

@@ -1,18 +0,0 @@
-name: Add new issues to product management project
-
-on:
-  issues:
-    types:
-      - opened
-
-jobs:
-  add-to-project:
-    name: Add issue to project
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/add-to-project@v0.5.0
-        with:
-          # You can target a repository in a different organization
-          # to the issue
-          project-url: https://github.com/orgs/zitadel/projects/2
-          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}

README.md

@@ -2,10 +2,10 @@
 
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 [![Release](https://github.com/zitadel/oidc/workflows/Release/badge.svg)](https://github.com/zitadel/oidc/actions)
-[![GoDoc](https://godoc.org/github.com/zitadel/oidc?status.png)](https://pkg.go.dev/github.com/zitadel/oidc)
+[![Go Reference](https://pkg.go.dev/badge/github.com/zitadel/oidc/v3.svg)](https://pkg.go.dev/github.com/zitadel/oidc/v3)
 [![license](https://badgen.net/github/license/zitadel/oidc/)](https://github.com/zitadel/oidc/blob/master/LICENSE)
 [![release](https://badgen.net/github/release/zitadel/oidc/stable)](https://github.com/zitadel/oidc/releases)
-[![Go Report Card](https://goreportcard.com/badge/github.com/zitadel/oidc)](https://goreportcard.com/report/github.com/zitadel/oidc)
+[![Go Report Card](https://goreportcard.com/badge/github.com/zitadel/oidc/v3)](https://goreportcard.com/report/github.com/zitadel/oidc/v3)
 [![codecov](https://codecov.io/gh/zitadel/oidc/branch/main/graph/badge.svg)](https://codecov.io/gh/zitadel/oidc)
 
 [![openid_certified](https://cloud.githubusercontent.com/assets/1454075/7611268/4d19de32-f97b-11e4-895b-31b2455a7ca6.png)](https://openid.net/certification/)
@@ -21,9 +21,10 @@ Whenever possible we tried to reuse / extend existing packages like `OAuth2 for
 ## Basic Overview
 
 The most important packages of the library:
+
 <pre>
 /pkg
-    /client            clients using the OP for retrieving, exchanging and verifying tokens       
+    /client            clients using the OP for retrieving, exchanging and verifying tokens
         /rp            definition and implementation of an OIDC Relying Party (client)
         /rs            definition and implementation of an OAuth Resource Server (API)
     /op                definition and implementation of an OIDC OpenID Provider (server)
@@ -37,6 +38,10 @@ The most important packages of the library:
     /server            examples of an OpenID Provider implementations (including dynamic) with some very basic login UI
 </pre>
 
+### Semver
+
+This package uses [semver](https://semver.org/) for [releases](https://github.com/zitadel/oidc/releases). Major releases ship breaking changes. Starting with the `v2` to `v3` increment we provide an [upgrade guide](UPGRADING.md) to ease migration to a newer version.
+
 ## How To Use It
 
 Check the `/example` folder where example code for different scenarios is located.
@@ -50,48 +55,84 @@ CLIENT_ID=web CLIENT_SECRET=secret ISSUER=http://localhost:9998/ SCOPES="openid
 ```
 
 - open http://localhost:9999/login in your browser
-- you will be redirected to op server and the login UI 
+- you will be redirected to op server and the login UI
 - login with user `test-user@localhost` and password `verysecure`
 - the OP will redirect you to the client app, which displays the user info
 
 for the dynamic issuer, just start it with:
+
 ```bash
 go run github.com/zitadel/oidc/v3/example/server/dynamic
-``` 
+```
+
 the oidc web client above will still work, but if you add `oidc.local` (pointing to 127.0.0.1) in your hosts file you can also start it with:
+
 ```bash
 CLIENT_ID=web CLIENT_SECRET=secret ISSUER=http://oidc.local:9998/ SCOPES="openid profile" PORT=9999 go run github.com/zitadel/oidc/v3/example/client/app
 ```
 
 > Note: Usernames are suffixed with the hostname (`test-user@localhost` or `test-user@oidc.local`)
 
+### Server configuration
+
+Example server allows extra configuration using environment variables and could be used for end to
+end testing of your services.
+
+| Name         | Format                           | Description                           |
+| ------------ | -------------------------------- | ------------------------------------- |
+| PORT         | Number between 1 and 65535       | OIDC listen port                      |
+| REDIRECT_URI | Comma-separated URIs             | List of allowed redirect URIs         |
+| USERS_FILE   | Path to json in local filesystem | Users with their data and credentials |
+
+Here is json equivalent for one of the default users
+
+```json
+{
+  "id2": {
+    "ID": "id2",
+    "Username": "test-user2",
+    "Password": "verysecure",
+    "FirstName": "Test",
+    "LastName": "User2",
+    "Email": "test-user2@zitadel.ch",
+    "EmailVerified": true,
+    "Phone": "",
+    "PhoneVerified": false,
+    "PreferredLanguage": "DE",
+    "IsAdmin": false
+  }
+}
+```
+
 ## Features
 
-|                      | Relying party | OpenID Provider | Specification                             |
+|                      | Relying party | OpenID Provider | Specification                                |
-| -------------------- | ------------- | --------------- | ----------------------------------------- |
+| -------------------- | ------------- | --------------- | -------------------------------------------- |
-| Code Flow            | yes           | yes             | OpenID Connect Core 1.0, [Section 3.1][1] |
+| Code Flow            | yes           | yes             | OpenID Connect Core 1.0, [Section 3.1][1]    |
-| Implicit Flow        | no[^1]        | yes             | OpenID Connect Core 1.0, [Section 3.2][2] |
+| Implicit Flow        | no[^1]        | yes             | OpenID Connect Core 1.0, [Section 3.2][2]    |
-| Hybrid Flow          | no            | not yet         | OpenID Connect Core 1.0, [Section 3.3][3] |
+| Hybrid Flow          | no            | not yet         | OpenID Connect Core 1.0, [Section 3.3][3]    |
-| Client Credentials   | not yet       | yes             | OpenID Connect Core 1.0, [Section 9][4]   |
+| Client Credentials   | yes           | yes             | OpenID Connect Core 1.0, [Section 9][4]      |
-| Refresh Token        | yes           | yes             | OpenID Connect Core 1.0, [Section 12][5]  |
+| Refresh Token        | yes           | yes             | OpenID Connect Core 1.0, [Section 12][5]     |
-| Discovery            | yes           | yes             | OpenID Connect [Discovery][6] 1.0         |
+| Discovery            | yes           | yes             | OpenID Connect [Discovery][6] 1.0            |
-| JWT Profile          | yes           | yes             | [RFC 7523][7]                             |
+| JWT Profile          | yes           | yes             | [RFC 7523][7]                                |
-| PKCE                 | yes           | yes             | [RFC 7636][8]                             |
+| PKCE                 | yes           | yes             | [RFC 7636][8]                                |
-| Token Exchange       | yes           | yes             | [RFC 8693][9]                             |
+| Token Exchange       | yes           | yes             | [RFC 8693][9]                                |
-| Device Authorization | yes           | yes             | [RFC 8628][10]                            |
+| Device Authorization | yes           | yes             | [RFC 8628][10]                               |
-| mTLS                 | not yet       | not yet         | [RFC 8705][11]                            |
+| mTLS                 | not yet       | not yet         | [RFC 8705][11]                               |
+| Back-Channel Logout  | not yet       | yes             | OpenID Connect [Back-Channel Logout][12] 1.0 |
 
-[1]: <https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth> "3.1. Authentication using the Authorization Code Flow"
+[1]: https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth "3.1. Authentication using the Authorization Code Flow"
-[2]: <https://openid.net/specs/openid-connect-core-1_0.html#ImplicitFlowAuth> "3.2. Authentication using the Implicit Flow"
+[2]: https://openid.net/specs/openid-connect-core-1_0.html#ImplicitFlowAuth "3.2. Authentication using the Implicit Flow"
-[3]: <https://openid.net/specs/openid-connect-core-1_0.html#HybridFlowAuth> "3.3. Authentication using the Hybrid Flow"
+[3]: https://openid.net/specs/openid-connect-core-1_0.html#HybridFlowAuth "3.3. Authentication using the Hybrid Flow"
-[4]: <https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication> "9. Client Authentication"
+[4]: https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication "9. Client Authentication"
-[5]: <https://openid.net/specs/openid-connect-core-1_0.html#RefreshTokens> "12. Using Refresh Tokens"
+[5]: https://openid.net/specs/openid-connect-core-1_0.html#RefreshTokens "12. Using Refresh Tokens"
-[6]: <https://openid.net/specs/openid-connect-discovery-1_0.html> "OpenID Connect Discovery 1.0 incorporating errata set 1"
+[6]: https://openid.net/specs/openid-connect-discovery-1_0.html "OpenID Connect Discovery 1.0 incorporating errata set 1"
-[7]: <https://www.rfc-editor.org/rfc/rfc7523.html> "JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and Authorization Grants"
+[7]: https://www.rfc-editor.org/rfc/rfc7523.html "JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and Authorization Grants"
-[8]: <https://www.rfc-editor.org/rfc/rfc7636.html> "Proof Key for Code Exchange by OAuth Public Clients"
+[8]: https://www.rfc-editor.org/rfc/rfc7636.html "Proof Key for Code Exchange by OAuth Public Clients"
-[9]: <https://www.rfc-editor.org/rfc/rfc8693.html> "OAuth 2.0 Token Exchange"
+[9]: https://www.rfc-editor.org/rfc/rfc8693.html "OAuth 2.0 Token Exchange"
-[10]: <https://www.rfc-editor.org/rfc/rfc8628.html> "OAuth 2.0 Device Authorization Grant"
+[10]: https://www.rfc-editor.org/rfc/rfc8628.html "OAuth 2.0 Device Authorization Grant"
-[11]: <https://www.rfc-editor.org/rfc/rfc8705.html> "OAuth 2.0 Mutual-TLS Client Authentication and Certificate-Bound Access Tokens"
+[11]: https://www.rfc-editor.org/rfc/rfc8705.html "OAuth 2.0 Mutual-TLS Client Authentication and Certificate-Bound Access Tokens"
+[12]: https://openid.net/specs/openid-connect-backchannel-1_0.html "OpenID Connect Back-Channel Logout 1.0 incorporating errata set 1"
 
 ## Contributors
 
@@ -110,15 +151,14 @@ For your convenience you can find the relevant guides linked below.
 
 ## Supported Go Versions
 
-For security reasons, we only support and recommend the use of one of the latest two Go versions (:white_check_mark:).  
+For security reasons, we only support and recommend the use of one of the latest two Go versions (:white_check_mark:).
 Versions that also build are marked with :warning:.
 
 | Version | Supported          |
 | ------- | ------------------ |
-| <1.19   | :x:                |
+| <1.23   | :x:                |
-| 1.19    | :warning:          |
+| 1.23    | :white_check_mark: |
-| 1.20    | :white_check_mark: |
+| 1.24    | :white_check_mark: |
-| 1.21    | :white_check_mark: |
 
 ## Why another library
 
@@ -149,5 +189,4 @@ Unless required by applicable law or agreed to in writing, software distributed
 AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
 language governing permissions and limitations under the License.
 
-
 [^1]: https://github.com/zitadel/oidc/issues/135#issuecomment-950563892

UPGRADING.md

@@ -0,0 +1,370 @@
+# Upgrading
+
+All commands are executed from the root of the project that imports oidc packages.
+`sed` commands are created with **GNU sed** in mind and might need alternate syntax
+on non-GNU systems, such as MacOS.
+Alternatively, GNU sed can be installed on such systems. (`coreutils` package?).
+
+## V2 to V3
+
+**TL;DR** at the [bottom](#full-script) of this chapter is a full `sed` script
+containing all automatic steps at once.
+
+
+As first steps we will:
+1. Download the latest v3 module;
+2. Replace imports in all Go files;
+3. Tidy the module file;
+
+```bash
+go get -u github.com/zitadel/oidc/v3
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/github\.com\/zitadel\/oidc\/v2/github.com\/zitadel\/oidc\/v3/g'
+go mod tidy
+```
+
+### global
+
+#### go-jose package
+
+`gopkg.in/square/go-jose.v2` import has been changed to `github.com/go-jose/go-jose/v3`.
+That means that the imported types are also changed and imports need to be adapted.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/gopkg.in\/square\/go-jose\.v2/github.com\/go-jose\/go-jose\/v3/g'
+go mod tidy
+```
+
+### op
+
+```go
+import "github.com/zitadel/oidc/v3/pkg/op"
+```
+
+#### Logger
+
+This version of OIDC adds logging to the framework. For this we use the new Go standard library `log/slog`. (Until v3.12.0 we used `x/exp/slog`).
+Mostly OIDC will use error level logs where it's returning an error through a HTTP handler. OIDC errors that are user facing don't carry much context, also for security reasons. With logging we are now able to print the error context, so that developers can more easily find the source of their issues. Previously we just discarded such context.
+
+Most users of the OP package with the storage interface will not experience breaking changes. However if you use `RequestError()` directly in your code, you now need to give it a `Logger` as final argument.
+
+The `OpenIDProvider` and sub-interfaces like `Authorizer` and `Exchanger` got a `Logger()` method to return the configured logger. This logger is in turn used by `AuthRequestError()`. You configure the logger with the `WithLogger()` for the `Provider`. By default the `slog.Default()` is used.
+
+We also provide a new optional interface: [`LogAuthRequest`](https://pkg.go.dev/github.com/zitadel/oidc/v3/pkg/op#LogAuthRequest). If an `AuthRequest` implements this interface, it is completely passed into the logger after an error. Its `LogValue()` will be used by `slog` to print desired fields. This allows omitting sensitive fields you wish not no print. If the interface is not implemented, no `AuthRequest` details will ever be printed.
+
+#### Server interface
+
+We've added a new [`Server`](https://pkg.go.dev/github.com/zitadel/oidc/v3/pkg/op#Server) interface. This interface is experimental and subject to change. See [issue 440](https://github.com/zitadel/oidc/issues/440) for the motivation and discussion around this new interface.
+Usage of the new interface is not required, but may be used for advanced scenarios when working with the `Storage` interface isn't the optimal solution for your app (like we experienced in [Zitadel](https://github.com/zitadel/zitadel)).
+
+#### AuthRequestError
+
+`AuthRequestError` now takes the complete `Authorizer` as final argument, instead of only the encoder.
+This is to facilitate the use of the `Logger` as described above.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/\bAuthRequestError(w, r, authReq, err, authorizer.Encoder())/AuthRequestError(w, r, authReq, err, authorizer)/g'
+```
+
+Note: the sed regex might not find all uses if the local variables of the passed arguments use different names.
+
+#### AccessTokenVerifier
+
+`AccessTokenVerifier` interface has become a struct type. `NewAccessTokenVerifier` now returns a pointer to `AccessTokenVerifier`.
+Variable and struct fields declarations need to be changed from `op.AccessTokenVerifier` to `*op.AccessTokenVerifier`.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/\bop\.AccessTokenVerifier\b/*op.AccessTokenVerifier/g'
+```
+
+#### JWTProfileVerifier
+
+`JWTProfileVerifier` interface has become a struct type. `NewJWTProfileVerifier` now returns a pointer to `JWTProfileVerifier`.
+Variable and struct fields declarations need to be changed from `op.JWTProfileVerifier` to `*op.JWTProfileVerifier`.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/\bop\.JWTProfileVerifier\b/*op.JWTProfileVerifier/g'
+```
+
+#### IDTokenHintVerifier
+
+`IDTokenHintVerifier` interface has become a struct type. `NewIDTokenHintVerifier` now returns a pointer to `IDTokenHintVerifier`.
+Variable and struct fields declarations need to be changed from `op.IDTokenHintVerifier` to `*op.IDTokenHintVerifier`.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/\bop\.IDTokenHintVerifier\b/*op.IDTokenHintVerifier/g'
+```
+
+#### ParseRequestObject
+
+`ParseRequestObject` no longer returns `*oidc.AuthRequest` as it already operates on the pointer for the passed `authReq` argument. As such the argument and the return value were the same pointer. Callers can just use the original `*oidc.AuthRequest` now.
+
+#### Endpoint Configuration
+
+`Endpoint`s returned from `Configuration` interface methods are now pointers. Usually, `op.Provider` is the main implementation of the `Configuration` interface. However, if a custom implementation is used, you should be able to update it using the following:
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/AuthorizationEndpoint() Endpoint/AuthorizationEndpoint() *Endpoint/g' \
+    -e 's/TokenEndpoint() Endpoint/TokenEndpoint() *Endpoint/g' \
+    -e 's/IntrospectionEndpoint() Endpoint/IntrospectionEndpoint() *Endpoint/g' \
+    -e 's/UserinfoEndpoint() Endpoint/UserinfoEndpoint() *Endpoint/g' \
+    -e 's/RevocationEndpoint() Endpoint/RevocationEndpoint() *Endpoint/g' \
+    -e 's/EndSessionEndpoint() Endpoint/EndSessionEndpoint() *Endpoint/g' \
+    -e 's/KeysEndpoint() Endpoint/KeysEndpoint() *Endpoint/g' \
+    -e 's/DeviceAuthorizationEndpoint() Endpoint/DeviceAuthorizationEndpoint() *Endpoint/g'
+```
+
+#### CreateDiscoveryConfig
+
+`CreateDiscoveryConfig` now takes a context as first argument. The following adds `context.TODO()` to the function:
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/op\.CreateDiscoveryConfig(/op.CreateDiscoveryConfig(context.TODO(), /g'
+```
+
+It now takes the issuer out of the context using the [`IssuerFromContext`](https://pkg.go.dev/github.com/zitadel/oidc/v3/pkg/op#IssuerFromContext) functionality,
+instead of the `config.IssuerFromRequest()` method.
+
+#### CreateRouter
+
+`CreateRouter` now returns a `chi.Router` instead of `*mux.Router`.
+Usually this function is called when the Provider is constructed and not by package consumers.
+However if your project does call this function directly, manual update of the code is required.
+
+#### DeviceAuthorizationStorage
+
+`DeviceAuthorizationStorage` dropped the following methods:
+
+- `GetDeviceAuthorizationByUserCode`
+- `CompleteDeviceAuthorization`
+- `DenyDeviceAuthorization`
+
+These methods proved not to be required from a library point of view.
+Implementations of a device authorization flow may take care of these calls in a way they see fit.
+
+#### AuthorizeCodeChallenge
+
+The `AuthorizeCodeChallenge` function now only takes the `CodeVerifier` argument, instead of the complete `*oidc.AccessTokenRequest`.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/op\.AuthorizeCodeChallenge(tokenReq/op.AuthorizeCodeChallenge(tokenReq.CodeVerifier/g'
+```
+
+### client
+
+```go
+import "github.com/zitadel/oidc/v3/pkg/client"
+```
+
+#### Context
+
+All client calls now take a context as first argument. The following adds `context.TODO()` to all the affected functions:
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/client\.Discover(/client.Discover(context.TODO(), /g' \
+    -e 's/client\.CallTokenEndpoint(/client.CallTokenEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallEndSessionEndpoint(/client.CallEndSessionEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallRevokeEndpoint(/client.CallRevokeEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallTokenExchangeEndpoint(/client.CallTokenExchangeEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallDeviceAuthorizationEndpoint(/client.CallDeviceAuthorizationEndpoint(context.TODO(), /g' \
+    -e 's/client\.JWTProfileExchange(/client.JWTProfileExchange(context.TODO(), /g'
+```
+
+#### keyFile type
+
+The `keyFile` struct type is now exported a `KeyFile` and returned by the `ConfigFromKeyFile` and `ConfigFromKeyFileData`. No changes are needed on the caller's side.
+
+### client/profile
+
+The package now defines a new interface `TokenSource` which compliments the `oauth2.TokenSource` with a `TokenCtx` method, so that a context can be explicitly added on each call. Users can migrate to the new method when they whish.
+
+`NewJWTProfileTokenSource` now takes a context as first argument, so do the related `NewJWTProfileTokenSourceFromKeyFile` and `NewJWTProfileTokenSourceFromKeyFileData`. The context is used for the Discovery request.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/profile\.NewJWTProfileTokenSource(/profile.NewJWTProfileTokenSource(context.TODO(), /g' \
+    -e 's/profile\.NewJWTProfileTokenSourceFromKeyFileData(/profile.NewJWTProfileTokenSourceFromKeyFileData(context.TODO(), /g' \
+    -e 's/profile\.NewJWTProfileTokenSourceFromKeyFile(/profile.NewJWTProfileTokenSourceFromKeyFile(context.TODO(), /g'
+```
+
+
+### client/rp
+
+```go
+import "github.com/zitadel/oidc/v3/pkg/client/rs"
+```
+
+#### Discover
+
+The `Discover` function has been removed. Use `client.Discover` instead.
+
+#### Context
+
+Most `rp` functions now require a context as first argument. The following adds `context.TODO()` to the function that have no additional changes. Functions with more complex changes are documented below.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/rp\.NewRelyingPartyOIDC(/rp.NewRelyingPartyOIDC(context.TODO(), /g' \
+    -e 's/rp\.EndSession(/rp.EndSession(context.TODO(), /g' \
+    -e 's/rp\.RevokeToken(/rp.RevokeToken(context.TODO(), /g' \
+    -e 's/rp\.DeviceAuthorization(/rp.DeviceAuthorization(context.TODO(), /g'
+```
+
+Remember to replace `context.TODO()` with a context that is applicable for your app, where possible.
+
+#### RefreshAccessToken
+
+1. Renamed to `RefreshTokens`;
+2. A context must be passed;
+3. An `*oidc.Tokens` object is now returned, which included an ID Token if it was returned by the server;
+4. The function is now generic and requires a type argument for the `IDTokenClaims` implementation inside the returned `oidc.Tokens` object;
+
+For most use cases `*oidc.IDTokenClaims` can be used as type argument. A custom implementation of `oidc.IDClaims` can be used if type-safe access to custom claims is required.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/rp\.RefreshAccessToken(/rp.RefreshTokens[*oidc.IDTokenClaims](context.TODO(), /g'
+```
+
+Users that called `tokens.Extra("id_token").(string)` and a subsequent `VerifyTokens` to get the claims, no longer need to do this. The ID token is verified (when present) by `RefreshTokens` already.
+
+
+#### Userinfo
+
+1. A context must be passed as first argument;
+2. The function is now generic and requires a type argument for the returned user info object;
+
+For most use cases `*oidc.UserInfo` can be used a type argument. A [custom implementation](https://pkg.go.dev/github.com/zitadel/oidc/v3/pkg/client/rp#example-Userinfo-Custom) of `rp.SubjectGetter` can be used if type-safe access to custom claims is required.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/rp\.Userinfo(/rp.Userinfo[*oidc.UserInfo](context.TODO(), /g'
+```
+
+#### UserinfoCallback
+
+`UserinfoCallback` has an additional type argument fot the `UserInfo` object. Typically the type argument can be inferred by the compiler, by the function that is passed. The actual code update cannot be done by a simple `sed` script and depends on how the caller implemented the function.
+
+
+#### IDTokenVerifier
+
+`IDTokenVerifier` interface has become a struct type. `NewIDTokenVerifier` now returns a pointer to `IDTokenVerifier`.
+Variable and struct fields declarations need to be changed from `rp.IDTokenVerifier` to `*rp.AccessTokenVerifier`.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/\brp\.IDTokenVerifier\b/*rp.IDTokenVerifier/g'
+```
+
+### client/rs
+
+```go
+import "github.com/zitadel/oidc/v3/pkg/client/rs"
+```
+
+#### NewResourceServer
+
+The `NewResourceServerClientCredentials` and `NewResourceServerJWTProfile` constructor functions now take a context as first argument.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/rs\.NewResourceServerClientCredentials(/rs.NewResourceServerClientCredentials(context.TODO(), /g' \
+    -e 's/rs\.NewResourceServerJWTProfile(/rs.NewResourceServerJWTProfile(context.TODO(), /g'
+```
+
+#### Introspect
+
+`Introspect` is now generic and requires a type argument for the returned introspection response. For most use cases `*oidc.IntrospectionResponse` can be used as type argument. Any other response type if type-safe access to [custom claims](https://pkg.go.dev/github.com/zitadel/oidc/v3/pkg/client/rs#example-Introspect-Custom) is required.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/rs\.Introspect(/rs.Introspect[*oidc.IntrospectionResponse](/g'
+```
+
+### client/tokenexchange
+
+The `TokenExchanger` constructor functions `NewTokenExchanger` and `NewTokenExchangerClientCredentials` now take a context as first argument.
+As well as the `ExchangeToken` function.
+
+```bash
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/tokenexchange\.NewTokenExchanger(/tokenexchange.NewTokenExchanger(context.TODO(), /g' \
+    -e 's/tokenexchange\.NewTokenExchangerClientCredentials(/tokenexchange.NewTokenExchangerClientCredentials(context.TODO(), /g' \
+    -e 's/tokenexchange\.ExchangeToken(/tokenexchange.ExchangeToken(context.TODO(), /g'
+```
+
+### oidc
+
+#### SpaceDelimitedArray
+
+The `SpaceDelimitedArray` type's `Encode()` function has been renamed to `String()` so it implements the `fmt.Stringer` interface. If the `Encode` method was called by a package consumer, it should be changed manually.
+
+#### Verifier
+
+The `Verifier` interface as been changed into a struct type. The struct type is aliased in the `op` and `rp` packages for the specific token use cases. See the relevant section above.
+
+### Full script
+
+For the courageous this is the full `sed` script which combines all the steps described above.
+It should migrate most of the code in a repository to a more-or-less compilable state,
+using defaults such as `context.TODO()` where possible.
+
+Warnings:
+- Again, this is written for **GNU sed** not the posix variant.
+- Assumes imports that use the package names, not aliases.
+- Do this on a project with version control (eg Git), that allows you to rollback if things went wrong.
+- The script has been tested on the [ZITADEL](https://github.com/zitadel/zitadel) project, but we do not use all affected symbols. Parts of the script are mere guesswork.
+
+```bash
+go get -u github.com/zitadel/oidc/v3
+find . -type f -name '*.go' | xargs sed -i \
+    -e 's/github\.com\/zitadel\/oidc\/v2/github.com\/zitadel\/oidc\/v3/g' \
+    -e 's/gopkg.in\/square\/go-jose\.v2/github.com\/go-jose\/go-jose\/v3/g' \
+    -e 's/\bAuthRequestError(w, r, authReq, err, authorizer.Encoder())/AuthRequestError(w, r, authReq, err, authorizer)/g' \
+    -e 's/\bop\.AccessTokenVerifier\b/*op.AccessTokenVerifier/g' \
+    -e 's/\bop\.JWTProfileVerifier\b/*op.JWTProfileVerifier/g' \
+    -e 's/\bop\.IDTokenHintVerifier\b/*op.IDTokenHintVerifier/g' \
+    -e 's/AuthorizationEndpoint() Endpoint/AuthorizationEndpoint() *Endpoint/g' \
+    -e 's/TokenEndpoint() Endpoint/TokenEndpoint() *Endpoint/g' \
+    -e 's/IntrospectionEndpoint() Endpoint/IntrospectionEndpoint() *Endpoint/g' \
+    -e 's/UserinfoEndpoint() Endpoint/UserinfoEndpoint() *Endpoint/g' \
+    -e 's/RevocationEndpoint() Endpoint/RevocationEndpoint() *Endpoint/g' \
+    -e 's/EndSessionEndpoint() Endpoint/EndSessionEndpoint() *Endpoint/g' \
+    -e 's/KeysEndpoint() Endpoint/KeysEndpoint() *Endpoint/g' \
+    -e 's/DeviceAuthorizationEndpoint() Endpoint/DeviceAuthorizationEndpoint() *Endpoint/g' \
+    -e 's/op\.CreateDiscoveryConfig(/op.CreateDiscoveryConfig(context.TODO(), /g' \
+    -e 's/op\.AuthorizeCodeChallenge(tokenReq/op.AuthorizeCodeChallenge(tokenReq.CodeVerifier/g' \
+    -e 's/client\.Discover(/client.Discover(context.TODO(), /g' \
+    -e 's/client\.CallTokenEndpoint(/client.CallTokenEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallEndSessionEndpoint(/client.CallEndSessionEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallRevokeEndpoint(/client.CallRevokeEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallTokenExchangeEndpoint(/client.CallTokenExchangeEndpoint(context.TODO(), /g' \
+    -e 's/client\.CallDeviceAuthorizationEndpoint(/client.CallDeviceAuthorizationEndpoint(context.TODO(), /g' \
+    -e 's/client\.JWTProfileExchange(/client.JWTProfileExchange(context.TODO(), /g' \
+    -e 's/profile\.NewJWTProfileTokenSource(/profile.NewJWTProfileTokenSource(context.TODO(), /g' \
+    -e 's/profile\.NewJWTProfileTokenSourceFromKeyFileData(/profile.NewJWTProfileTokenSourceFromKeyFileData(context.TODO(), /g' \
+    -e 's/profile\.NewJWTProfileTokenSourceFromKeyFile(/profile.NewJWTProfileTokenSourceFromKeyFile(context.TODO(), /g' \
+    -e 's/rp\.NewRelyingPartyOIDC(/rp.NewRelyingPartyOIDC(context.TODO(), /g' \
+    -e 's/rp\.EndSession(/rp.EndSession(context.TODO(), /g' \
+    -e 's/rp\.RevokeToken(/rp.RevokeToken(context.TODO(), /g' \
+    -e 's/rp\.DeviceAuthorization(/rp.DeviceAuthorization(context.TODO(), /g' \
+    -e 's/rp\.RefreshAccessToken(/rp.RefreshTokens[*oidc.IDTokenClaims](context.TODO(), /g' \
+    -e 's/rp\.Userinfo(/rp.Userinfo[*oidc.UserInfo](context.TODO(), /g' \
+    -e 's/\brp\.IDTokenVerifier\b/*rp.IDTokenVerifier/g' \
+    -e 's/rs\.NewResourceServerClientCredentials(/rs.NewResourceServerClientCredentials(context.TODO(), /g' \
+    -e 's/rs\.NewResourceServerJWTProfile(/rs.NewResourceServerJWTProfile(context.TODO(), /g' \
+    -e 's/rs\.Introspect(/rs.Introspect[*oidc.IntrospectionResponse](/g' \
+    -e 's/tokenexchange\.NewTokenExchanger(/tokenexchange.NewTokenExchanger(context.TODO(), /g' \
+    -e 's/tokenexchange\.NewTokenExchangerClientCredentials(/tokenexchange.NewTokenExchangerClientCredentials(context.TODO(), /g' \
+    -e 's/tokenexchange\.ExchangeToken(/tokenexchange.ExchangeToken(context.TODO(), /g'
+go mod tidy
+```

example/client/api/api.go

@@ -13,8 +13,8 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/sirupsen/logrus"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rs"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rs"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 const (

example/client/app/app.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log/slog"
 	"net/http"
 	"os"
 	"strings"
@@ -12,12 +13,11 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/sirupsen/logrus"
-	"golang.org/x/exp/slog"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/zitadel/logging"
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
 var (
@@ -32,6 +32,7 @@ func main() {
 	issuer := os.Getenv("ISSUER")
 	port := os.Getenv("PORT")
 	scopes := strings.Split(os.Getenv("SCOPES"), " ")
+	responseMode := os.Getenv("RESPONSE_MODE")
 
 	redirectURI := fmt.Sprintf("http://localhost:%v%v", port, callbackPath)
 	cookieHandler := httphelper.NewCookieHandler(key, key, httphelper.WithUnsecure())
@@ -55,6 +56,7 @@ func main() {
 		rp.WithVerifierOpts(rp.WithIssuedAtOffset(5 * time.Second)),
 		rp.WithHTTPClient(client),
 		rp.WithLogger(logger),
+		rp.WithSigningAlgsFromDiscovery(),
 	}
 	if clientSecret == "" {
 		options = append(options, rp.WithPKCE(cookieHandler))
@@ -77,20 +79,37 @@ func main() {
 		return uuid.New().String()
 	}
 
+	urlOptions := []rp.URLParamOpt{
+		rp.WithPromptURLParam("Welcome back!"),
+	}
+
+	if responseMode != "" {
+		urlOptions = append(urlOptions, rp.WithResponseModeURLParam(oidc.ResponseMode(responseMode)))
+	}
+
 	// register the AuthURLHandler at your preferred path.
 	// the AuthURLHandler creates the auth request and redirects the user to the auth server.
 	// including state handling with secure cookie and the possibility to use PKCE.
 	// Prompts can optionally be set to inform the server of
 	// any messages that need to be prompted back to the user.
-	http.Handle("/login", rp.AuthURLHandler(state, provider, rp.WithPromptURLParam("Welcome back!")))
+	http.Handle("/login", rp.AuthURLHandler(
+		state,
+		provider,
+		urlOptions...,
+	))
 
 	// for demonstration purposes the returned userinfo response is written as JSON object onto response
 	marshalUserinfo := func(w http.ResponseWriter, r *http.Request, tokens *oidc.Tokens[*oidc.IDTokenClaims], state string, rp rp.RelyingParty, info *oidc.UserInfo) {
+		fmt.Println("access token", tokens.AccessToken)
+		fmt.Println("refresh token", tokens.RefreshToken)
+		fmt.Println("id token", tokens.IDToken)
+
 		data, err := json.Marshal(info)
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
+		w.Header().Set("content-type", "application/json")
 		w.Write(data)
 	}
 

example/client/device/device.go

@@ -1,3 +1,37 @@
+// Command device is an example Oauth2 Device Authorization Grant app.
+// It creates a new Device Authorization request on the Issuer and then polls for tokens.
+// The user is then prompted to visit a URL and enter the user code.
+// Or, the complete URL can be used instead to omit manual entry.
+// In practice then can be a "magic link" in the form or a QR.
+//
+// The following environment variables are used for configuration:
+//
+//	ISSUER: URL to the OP, required.
+//	CLIENT_ID: ID of the application, required.
+//	CLIENT_SECRET: Secret to authenticate the app using basic auth. Only required if the OP expects this type of authentication.
+//	KEY_PATH: Path to a private key file, used to for JWT authentication of the App. Only required if the OP expects this type of authentication.
+//	SCOPES: Scopes of the Authentication Request. Optional.
+//
+// Basic usage:
+//
+//	cd example/client/device
+//	export ISSUER="http://localhost:9000" CLIENT_ID="246048465824634593@demo"
+//
+// Get an Access Token:
+//
+//	SCOPES="email profile" go run .
+//
+// Get an Access Token and ID Token:
+//
+//	SCOPES="email profile openid" go run .
+//
+// Get an Access Token and Refresh Token
+//
+//	SCOPES="email profile offline_access" go run .
+//
+// Get Access, Refresh and ID Tokens:
+//
+//	SCOPES="email profile offline_access openid" go run .
 package main
 
 import (
@@ -11,8 +45,8 @@ import (
 
 	"github.com/sirupsen/logrus"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
 )
 
 var (
@@ -57,5 +91,5 @@ func main() {
 	if err != nil {
 		logrus.Fatal(err)
 	}
-	logrus.Infof("successfully obtained token: %v", token)
+	logrus.Infof("successfully obtained token: %#v", token)
 }

example/client/github/github.go

@@ -10,10 +10,10 @@ import (
 	"golang.org/x/oauth2"
 	githubOAuth "golang.org/x/oauth2/github"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	"github.com/zitadel/oidc/v3/pkg/client/rp/cli"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp/cli"
-	"github.com/zitadel/oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 var (

example/client/service/service.go

@@ -13,7 +13,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"golang.org/x/oauth2"
 
-	"github.com/zitadel/oidc/v3/pkg/client/profile"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/profile"
 )
 
 var client = http.DefaultClient

example/server/config/config.go

@@ -0,0 +1,40 @@
+package config
+
+import (
+	"os"
+	"strings"
+)
+
+const (
+	// default port for the http server to run
+	DefaultIssuerPort = "9998"
+)
+
+type Config struct {
+	Port        string
+	RedirectURI []string
+	UsersFile   string
+}
+
+// FromEnvVars loads configuration parameters from environment variables.
+// If there is no such variable defined, then use default values.
+func FromEnvVars(defaults *Config) *Config {
+	if defaults == nil {
+		defaults = &Config{}
+	}
+	cfg := &Config{
+		Port:        defaults.Port,
+		RedirectURI: defaults.RedirectURI,
+		UsersFile:   defaults.UsersFile,
+	}
+	if value, ok := os.LookupEnv("PORT"); ok {
+		cfg.Port = value
+	}
+	if value, ok := os.LookupEnv("USERS_FILE"); ok {
+		cfg.UsersFile = value
+	}
+	if value, ok := os.LookupEnv("REDIRECT_URI"); ok {
+		cfg.RedirectURI = strings.Split(value, ",")
+	}
+	return cfg
+}

example/server/config/config_test.go

@@ -0,0 +1,77 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestFromEnvVars(t *testing.T) {
+
+	for _, tc := range []struct {
+		name     string
+		env      map[string]string
+		defaults *Config
+		want     *Config
+	}{
+		{
+			name: "no vars, no default values",
+			env:  map[string]string{},
+			want: &Config{},
+		},
+		{
+			name: "no vars, only defaults",
+			env:  map[string]string{},
+			defaults: &Config{
+				Port:        "6666",
+				UsersFile:   "/default/user/path",
+				RedirectURI: []string{"re", "direct", "uris"},
+			},
+			want: &Config{
+				Port:        "6666",
+				UsersFile:   "/default/user/path",
+				RedirectURI: []string{"re", "direct", "uris"},
+			},
+		},
+		{
+			name: "overriding default values",
+			env: map[string]string{
+				"PORT":         "1234",
+				"USERS_FILE":   "/path/to/users",
+				"REDIRECT_URI": "http://redirect/redirect",
+			},
+			defaults: &Config{
+				Port:        "6666",
+				UsersFile:   "/default/user/path",
+				RedirectURI: []string{"re", "direct", "uris"},
+			},
+			want: &Config{
+				Port:        "1234",
+				UsersFile:   "/path/to/users",
+				RedirectURI: []string{"http://redirect/redirect"},
+			},
+		},
+		{
+			name: "multiple redirect uris",
+			env: map[string]string{
+				"REDIRECT_URI": "http://host_1,http://host_2,http://host_3",
+			},
+			want: &Config{
+				RedirectURI: []string{
+					"http://host_1", "http://host_2", "http://host_3",
+				},
+			},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			os.Clearenv()
+			for k, v := range tc.env {
+				os.Setenv(k, v)
+			}
+			cfg := FromEnvVars(tc.defaults)
+			if fmt.Sprint(cfg) != fmt.Sprint(tc.want) {
+				t.Errorf("Expected FromEnvVars()=%q, but got %q", tc.want, cfg)
+			}
+		})
+	}
+}

example/server/dynamic/login.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/go-chi/chi/v5"
 
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 const (

example/server/dynamic/op.go

@@ -10,8 +10,8 @@ import (
 	"github.com/go-chi/chi/v5"
 	"golang.org/x/text/language"
 
-	"github.com/zitadel/oidc/v3/example/server/storage"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/storage"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 const (

example/server/exampleop/device.go

@@ -8,10 +8,10 @@ import (
 	"net/http"
 	"net/url"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 	"github.com/go-chi/chi/v5"
 	"github.com/gorilla/securecookie"
 	"github.com/sirupsen/logrus"
-	"github.com/zitadel/oidc/v3/pkg/op"
 )
 
 type deviceAuthenticate interface {

example/server/exampleop/login.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"net/http"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 	"github.com/go-chi/chi/v5"
-	"github.com/zitadel/oidc/v3/pkg/op"
 )
 
 type login struct {

example/server/exampleop/op.go

@@ -3,31 +3,22 @@ package exampleop
 import (
 	"crypto/sha256"
 	"log"
+	"log/slog"
 	"net/http"
 	"sync/atomic"
 	"time"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/zitadel/logging"
-	"golang.org/x/exp/slog"
 	"golang.org/x/text/language"
 
-	"github.com/zitadel/oidc/v3/example/server/storage"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
-	"github.com/zitadel/oidc/v3/pkg/op"
 )
 
 const (
 	pathLoggedOut = "/logged-out"
 )
 
-func init() {
-	storage.RegisterClients(
-		storage.NativeClient("native"),
-		storage.WebClient("web", "secret"),
-		storage.WebClient("api", "secret"),
-	)
-}
-
 type Storage interface {
 	op.Storage
 	authenticate
@@ -56,7 +47,7 @@ func SetupServer(issuer string, storage Storage, logger *slog.Logger, wrapServer
 	// for simplicity, we provide a very small default page for users who have signed out
 	router.HandleFunc(pathLoggedOut, func(w http.ResponseWriter, req *http.Request) {
 		w.Write([]byte("signed out successfully"))
-		// no need to check/log error, this will be handeled by the middleware.
+		// no need to check/log error, this will be handled by the middleware.
 	})
 
 	// creation of the OpenIDProvider with the just created in-memory Storage
@@ -80,7 +71,7 @@ func SetupServer(issuer string, storage Storage, logger *slog.Logger, wrapServer
 
 	handler := http.Handler(provider)
 	if wrapServer {
-		handler = op.RegisterLegacyServer(op.NewLegacyServer(provider, *op.DefaultEndpoints))
+		handler = op.RegisterLegacyServer(op.NewLegacyServer(provider, *op.DefaultEndpoints), op.AuthorizeCallbackHandler(provider))
 	}
 
 	// we register the http handler of the OP on the root, so that the discovery endpoint (/.well-known/openid-configuration)

example/server/main.go

@@ -2,40 +2,57 @@ package main
 
 import (
 	"fmt"
+	"log/slog"
 	"net/http"
 	"os"
 
-	"github.com/zitadel/oidc/v3/example/server/exampleop"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/config"
-	"github.com/zitadel/oidc/v3/example/server/storage"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/exampleop"
-	"golang.org/x/exp/slog"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/storage"
 )
 
+func getUserStore(cfg *config.Config) (storage.UserStore, error) {
+	if cfg.UsersFile == "" {
+		return storage.NewUserStore(fmt.Sprintf("http://localhost:%s/", cfg.Port)), nil
+	}
+	return storage.StoreFromFile(cfg.UsersFile)
+}
+
 func main() {
-	//we will run on :9998
+	cfg := config.FromEnvVars(&config.Config{Port: "9998"})
-	port := "9998"
-	//which gives us the issuer: http://localhost:9998/
-	issuer := fmt.Sprintf("http://localhost:%s/", port)
-
-	// the OpenIDProvider interface needs a Storage interface handling various checks and state manipulations
-	// this might be the layer for accessing your database
-	// in this example it will be handled in-memory
-	storage := storage.NewStorage(storage.NewUserStore(issuer))
-
 	logger := slog.New(
 		slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
 			AddSource: true,
 			Level:     slog.LevelDebug,
 		}),
 	)
+
+	//which gives us the issuer: http://localhost:9998/
+	issuer := fmt.Sprintf("http://localhost:%s/", cfg.Port)
+
+	storage.RegisterClients(
+		storage.NativeClient("native", cfg.RedirectURI...),
+		storage.WebClient("web", "secret", cfg.RedirectURI...),
+		storage.WebClient("api", "secret", cfg.RedirectURI...),
+	)
+
+	// the OpenIDProvider interface needs a Storage interface handling various checks and state manipulations
+	// this might be the layer for accessing your database
+	// in this example it will be handled in-memory
+	store, err := getUserStore(cfg)
+	if err != nil {
+		logger.Error("cannot create UserStore", "error", err)
+		os.Exit(1)
+	}
+	storage := storage.NewStorage(store)
 	router := exampleop.SetupServer(issuer, storage, logger, false)
 
 	server := &http.Server{
-		Addr:    ":" + port,
+		Addr:    ":" + cfg.Port,
 		Handler: router,
 	}
-	logger.Info("server listening, press ctrl+c to stop", "addr", fmt.Sprintf("http://localhost:%s/", port))
+	logger.Info("server listening, press ctrl+c to stop", "addr", issuer)
-	err := server.ListenAndServe()
+	if server.ListenAndServe() != http.ErrServerClosed {
-	if err != http.ErrServerClosed {
 		logger.Error("server terminated", "error", err)
 		os.Exit(1)
 	}

example/server/storage/client.go

@@ -3,8 +3,8 @@ package storage
 import (
 	"time"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 var (
@@ -184,10 +184,10 @@ func WebClient(id, secret string, redirectURIs ...string) *Client {
 		applicationType:                op.ApplicationTypeWeb,
 		authMethod:                     oidc.AuthMethodBasic,
 		loginURL:                       defaultLoginURL,
-		responseTypes:                  []oidc.ResponseType{oidc.ResponseTypeCode},
+		responseTypes:                  []oidc.ResponseType{oidc.ResponseTypeCode, oidc.ResponseTypeIDTokenOnly, oidc.ResponseTypeIDToken},
 		grantTypes:                     []oidc.GrantType{oidc.GrantTypeCode, oidc.GrantTypeRefreshToken, oidc.GrantTypeTokenExchange},
 		accessTokenType:                op.AccessTokenTypeBearer,
-		devMode:                        false,
+		devMode:                        true,
 		idTokenUserinfoClaimsAssertion: false,
 		clockSkew:                      0,
 	}

example/server/storage/oidc.go

@@ -1,13 +1,13 @@
 package storage
 
 import (
+	"log/slog"
 	"time"
 
-	"golang.org/x/exp/slog"
 	"golang.org/x/text/language"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 const (
@@ -35,6 +35,7 @@ type AuthRequest struct {
 	UserID        string
 	Scopes        []string
 	ResponseType  oidc.ResponseType
+	ResponseMode  oidc.ResponseMode
 	Nonce         string
 	CodeChallenge *OIDCCodeChallenge
 
@@ -100,7 +101,7 @@ func (a *AuthRequest) GetResponseType() oidc.ResponseType {
 }
 
 func (a *AuthRequest) GetResponseMode() oidc.ResponseMode {
-	return "" // we won't handle response mode in this example
+	return a.ResponseMode
 }
 
 func (a *AuthRequest) GetScopes() []string {
@@ -120,7 +121,7 @@ func (a *AuthRequest) Done() bool {
 }
 
 func PromptToInternal(oidcPrompt oidc.SpaceDelimitedArray) []string {
-	prompts := make([]string, len(oidcPrompt))
+	prompts := make([]string, 0, len(oidcPrompt))
 	for _, oidcPrompt := range oidcPrompt {
 		switch oidcPrompt {
 		case oidc.PromptNone,
@@ -154,6 +155,7 @@ func authRequestToInternal(authReq *oidc.AuthRequest, userID string) *AuthReques
 		UserID:        userID,
 		Scopes:        authReq.Scopes,
 		ResponseType:  authReq.ResponseType,
+		ResponseMode:  authReq.ResponseMode,
 		Nonce:         authReq.Nonce,
 		CodeChallenge: &OIDCCodeChallenge{
 			Challenge: authReq.CodeChallenge,
@@ -162,6 +164,15 @@ func authRequestToInternal(authReq *oidc.AuthRequest, userID string) *AuthReques
 	}
 }
 
+type AuthRequestWithSessionState struct {
+	*AuthRequest
+	SessionState string
+}
+
+func (a *AuthRequestWithSessionState) GetSessionState() string {
+	return a.SessionState
+}
+
 type OIDCCodeChallenge struct {
 	Challenge string
 	Method    string

example/server/storage/storage.go

@@ -11,11 +11,11 @@ import (
 	"sync"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/google/uuid"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 // serviceKey1 is a public key which will be used for the JWT Profile Authorization Grant
@@ -90,6 +90,10 @@ func (s *publicKey) Key() any {
 }
 
 func NewStorage(userStore UserStore) *Storage {
+	return NewStorageWithClients(userStore, clients)
+}
+
+func NewStorageWithClients(userStore UserStore, clients map[string]*Client) *Storage {
 	key, _ := rsa.GenerateKey(rand.Reader, 2048)
 	return &Storage{
 		authRequests:  make(map[string]*AuthRequest),
@@ -147,6 +151,9 @@ func (s *Storage) CheckUsernamePassword(username, password, id string) error {
 		// in this example we'll simply check the username / password and set a boolean to true
 		// therefore we will also just check this boolean if the request / login has been finished
 		request.done = true
+
+		request.authTime = time.Now()
+
 		return nil
 	}
 	return fmt.Errorf("username or password wrong")
@@ -291,15 +298,19 @@ func (s *Storage) CreateAccessAndRefreshTokens(ctx context.Context, request op.T
 
 	// if we get here, the currentRefreshToken was not empty, so the call is a refresh token request
 	// we therefore will have to check the currentRefreshToken and renew the refresh token
-	refreshToken, refreshTokenID, err := s.renewRefreshToken(currentRefreshToken)
+
+	newRefreshToken = uuid.NewString()
+
+	accessToken, err := s.accessToken(applicationID, newRefreshToken, request.GetSubject(), request.GetAudience(), request.GetScopes())
 	if err != nil {
 		return "", "", time.Time{}, err
 	}
-	accessToken, err := s.accessToken(applicationID, refreshTokenID, request.GetSubject(), request.GetAudience(), request.GetScopes())
+
-	if err != nil {
+	if err := s.renewRefreshToken(currentRefreshToken, newRefreshToken, accessToken.ID); err != nil {
 		return "", "", time.Time{}, err
 	}
-	return accessToken.ID, refreshToken, accessToken.Expiration, nil
+
+	return accessToken.ID, newRefreshToken, accessToken.Expiration, nil
 }
 
 func (s *Storage) exchangeRefreshToken(ctx context.Context, request op.TokenExchangeRequest) (accessTokenID string, newRefreshToken string, expiration time.Time, err error) {
@@ -381,14 +392,9 @@ func (s *Storage) RevokeToken(ctx context.Context, tokenIDOrToken string, userID
 	if refreshToken.ApplicationID != clientID {
 		return oidc.ErrInvalidClient().WithDescription("token was not issued for this client")
 	}
-	// if it is a refresh token, you will have to remove the access token as well
 	delete(s.refreshTokens, refreshToken.ID)
-	for _, accessToken := range s.tokens {
+	// if it is a refresh token, you will have to remove the access token as well
-		if accessToken.RefreshTokenID == refreshToken.ID {
+	delete(s.tokens, refreshToken.AccessToken)
-			delete(s.tokens, accessToken.ID)
-			return nil
-		}
-	}
 	return nil
 }
 
@@ -484,6 +490,9 @@ func (s *Storage) SetUserinfoFromToken(ctx context.Context, userinfo *oidc.UserI
 	//		return err
 	//	}
 	//}
+	if token.Expiration.Before(time.Now()) {
+		return fmt.Errorf("token is expired")
+	}
 	return s.setUserinfo(ctx, userinfo, token.Subject, token.ApplicationID, token.Scopes)
 }
 
@@ -590,33 +599,41 @@ func (s *Storage) createRefreshToken(accessToken *Token, amr []string, authTime
 		Audience:      accessToken.Audience,
 		Expiration:    time.Now().Add(5 * time.Hour),
 		Scopes:        accessToken.Scopes,
+		AccessToken:   accessToken.ID,
 	}
 	s.refreshTokens[token.ID] = token
 	return token.Token, nil
 }
 
 // renewRefreshToken checks the provided refresh_token and creates a new one based on the current
-func (s *Storage) renewRefreshToken(currentRefreshToken string) (string, string, error) {
+//
+// [Refresh Token Rotation] is implemented.
+//
+// [Refresh Token Rotation]: https://www.rfc-editor.org/rfc/rfc6819#section-5.2.2.3
+func (s *Storage) renewRefreshToken(currentRefreshToken, newRefreshToken, newAccessToken string) error {
 	s.lock.Lock()
 	defer s.lock.Unlock()
 	refreshToken, ok := s.refreshTokens[currentRefreshToken]
 	if !ok {
-		return "", "", fmt.Errorf("invalid refresh token")
+		return fmt.Errorf("invalid refresh token")
 	}
-	// deletes the refresh token and all access tokens which were issued based on this refresh token
+	// deletes the refresh token
 	delete(s.refreshTokens, currentRefreshToken)
-	for _, token := range s.tokens {
+
-		if token.RefreshTokenID == currentRefreshToken {
+	// delete the access token which was issued based on this refresh token
-			delete(s.tokens, token.ID)
+	delete(s.tokens, refreshToken.AccessToken)
-			break
+
-		}
+	if refreshToken.Expiration.Before(time.Now()) {
+		return fmt.Errorf("expired refresh token")
 	}
+
 	// creates a new refresh token based on the current one
-	token := uuid.NewString()
+	refreshToken.Token = newRefreshToken
-	refreshToken.Token = token
+	refreshToken.ID = newRefreshToken
-	refreshToken.ID = token
+	refreshToken.Expiration = time.Now().Add(5 * time.Hour)
-	s.refreshTokens[token] = refreshToken
+	refreshToken.AccessToken = newAccessToken
-	return token, refreshToken.ID, nil
+	s.refreshTokens[newRefreshToken] = refreshToken
+	return nil
 }
 
 // accessToken will store an access_token in-memory based on the provided information

example/server/storage/storage_dynamic.go

@@ -4,10 +4,10 @@ import (
 	"context"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 type multiStorage struct {

example/server/storage/token.go

@@ -22,4 +22,5 @@ type RefreshToken struct {
 	ApplicationID string
 	Expiration    time.Time
 	Scopes        []string
+	AccessToken   string // Token.ID
 }

example/server/storage/user.go

@@ -2,6 +2,8 @@ package storage
 
 import (
 	"crypto/rsa"
+	"encoding/json"
+	"os"
 	"strings"
 
 	"golang.org/x/text/language"
@@ -35,6 +37,18 @@ type userStore struct {
 	users map[string]*User
 }
 
+func StoreFromFile(path string) (UserStore, error) {
+	users := map[string]*User{}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	if err := json.Unmarshal(data, &users); err != nil {
+		return nil, err
+	}
+	return userStore{users}, nil
+}
+
 func NewUserStore(issuer string) UserStore {
 	hostname := strings.Split(strings.Split(issuer, "://")[1], ":")[0]
 	return userStore{

example/server/storage/user_test.go

@@ -0,0 +1,70 @@
+package storage
+
+import (
+	"os"
+	"path"
+	"reflect"
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+func TestStoreFromFile(t *testing.T) {
+	for _, tc := range []struct {
+		name       string
+		pathToFile string
+		content    string
+		want       UserStore
+		wantErr    bool
+	}{
+		{
+			name:       "normal user file",
+			pathToFile: "userfile.json",
+			content: `{
+				"id1": {
+					"ID":                "id1",
+					"EmailVerified":     true,
+					"PreferredLanguage": "DE"
+				}
+			}`,
+			want: userStore{map[string]*User{
+				"id1": {
+					ID:                "id1",
+					EmailVerified:     true,
+					PreferredLanguage: language.German,
+				},
+			}},
+		},
+		{
+			name:       "malformed file",
+			pathToFile: "whatever",
+			content:    "not a json just a text",
+			wantErr:    true,
+		},
+		{
+			name:       "not existing file",
+			pathToFile: "what/ever/file",
+			wantErr:    true,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			actualPath := path.Join(t.TempDir(), tc.pathToFile)
+
+			if tc.content != "" && tc.pathToFile != "" {
+				if err := os.WriteFile(actualPath, []byte(tc.content), 0666); err != nil {
+					t.Fatalf("cannot create file with test content: %q", tc.content)
+				}
+			}
+			result, err := StoreFromFile(actualPath)
+			if err != nil && !tc.wantErr {
+				t.Errorf("StoreFromFile(%q) returned unexpected error %q", tc.pathToFile, err)
+			} else if err == nil && tc.wantErr {
+				t.Errorf("StoreFromFile(%q) did not return an expected error", tc.pathToFile)
+			}
+			if !tc.wantErr && !reflect.DeepEqual(tc.want, result.(userStore)) {
+				t.Errorf("expected StoreFromFile(%q) = %v, but got %v",
+					tc.pathToFile, tc.want, result)
+			}
+		})
+	}
+}

go.mod

@@ -1,41 +1,40 @@
-module github.com/zitadel/oidc/v3
+module git.christmann.info/LARA/zitadel-oidc/v3
 
-go 1.19
+go 1.23.7
+
+toolchain go1.24.1
 
 require (
-	github.com/go-chi/chi/v5 v5.0.10
+	github.com/bmatcuk/doublestar/v4 v4.8.1
-	github.com/go-jose/go-jose/v3 v3.0.1
+	github.com/go-chi/chi/v5 v5.2.1
+	github.com/go-jose/go-jose/v4 v4.0.5
 	github.com/golang/mock v1.6.0
 	github.com/google/go-github/v31 v31.0.0
-	github.com/google/uuid v1.4.0
+	github.com/google/uuid v1.6.0
 	github.com/gorilla/securecookie v1.1.2
-	github.com/jeremija/gosubmit v0.2.7
+	github.com/jeremija/gosubmit v0.2.8
 	github.com/muhlemmer/gu v0.3.1
 	github.com/muhlemmer/httpforwarded v0.1.0
-	github.com/rs/cors v1.10.1
+	github.com/rs/cors v1.11.1
 	github.com/sirupsen/logrus v1.9.3
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.10.0
-	github.com/zitadel/logging v0.5.0
+	github.com/zitadel/logging v0.6.2
-	github.com/zitadel/schema v1.3.0
+	github.com/zitadel/schema v1.3.1
-	go.opentelemetry.io/otel v1.21.0
+	go.opentelemetry.io/otel v1.29.0
-	go.opentelemetry.io/otel/trace v1.21.0
+	golang.org/x/oauth2 v0.30.0
-	golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63
+	golang.org/x/text v0.26.0
-	golang.org/x/oauth2 v0.14.0
-	golang.org/x/text v0.14.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/go-logr/logr v1.3.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/metric v1.29.0 // indirect
-	golang.org/x/crypto v0.15.0 // indirect
+	go.opentelemetry.io/otel/trace v1.29.0 // indirect
-	golang.org/x/net v0.18.0 // indirect
+	golang.org/x/crypto v0.36.0 // indirect
-	golang.org/x/sys v0.14.0 // indirect
+	golang.org/x/net v0.38.0 // indirect
-	google.golang.org/appengine v1.6.7 // indirect
+	golang.org/x/sys v0.31.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,85 +1,80 @@
+github.com/bmatcuk/doublestar/v4 v4.8.1 h1:54Bopc5c2cAvhLRAzqOGCYHYyhcDHsFF4wWIR5wKP38=
+github.com/bmatcuk/doublestar/v4 v4.8.1/go.mod h1:xBQ8jztBU6kakFMg+8WGxn0c6z1fTSPVIjEY1Wr7jzc=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -88,14 +83,13 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
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 golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
@@ -104,15 +98,11 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
-google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/testutil/gen/gen.go

@@ -8,8 +8,8 @@ import (
 	"fmt"
 	"os"
 
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 var custom = map[string]any{

internal/testutil/token.go

@@ -8,9 +8,9 @@ import (
 	"errors"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/muhlemmer/gu"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
 // KeySet implements oidc.Keys

pkg/client/client.go

@@ -2,7 +2,6 @@ package client
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -11,20 +10,27 @@ import (
 	"strings"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	"github.com/go-jose/go-jose/v4"
+	"github.com/zitadel/logging"
+	"go.opentelemetry.io/otel"
 	"golang.org/x/oauth2"
 
-	"github.com/zitadel/logging"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/crypto"
-	"github.com/zitadel/oidc/v3/pkg/crypto"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
-var Encoder = httphelper.Encoder(oidc.NewEncoder())
+var (
+	Encoder = httphelper.Encoder(oidc.NewEncoder())
+	Tracer  = otel.Tracer("github.com/zitadel/oidc/pkg/client")
+)
 
 // Discover calls the discovery endpoint of the provided issuer and returns its configuration
 // It accepts an optional argument "wellknownUrl" which can be used to overide the dicovery endpoint url
 func Discover(ctx context.Context, issuer string, httpClient *http.Client, wellKnownUrl ...string) (*oidc.DiscoveryConfiguration, error) {
+	ctx, span := Tracer.Start(ctx, "Discover")
+	defer span.End()
+
 	wellKnown := strings.TrimSuffix(issuer, "/") + oidc.DiscoveryEndpoint
 	if len(wellKnownUrl) == 1 && wellKnownUrl[0] != "" {
 		wellKnown = wellKnownUrl[0]
@@ -36,7 +42,7 @@ func Discover(ctx context.Context, issuer string, httpClient *http.Client, wellK
 	discoveryConfig := new(oidc.DiscoveryConfiguration)
 	err = httphelper.HttpRequest(httpClient, req, &discoveryConfig)
 	if err != nil {
-		return nil, err
+		return nil, errors.Join(oidc.ErrDiscoveryFailed, err)
 	}
 	if logger, ok := logging.FromContext(ctx); ok {
 		logger.Debug("discover", "config", discoveryConfig)
@@ -58,6 +64,9 @@ func CallTokenEndpoint(ctx context.Context, request any, caller TokenEndpointCal
 }
 
 func callTokenEndpoint(ctx context.Context, request any, authFn any, caller TokenEndpointCaller) (newToken *oauth2.Token, err error) {
+	ctx, span := Tracer.Start(ctx, "callTokenEndpoint")
+	defer span.End()
+
 	req, err := httphelper.FormRequest(ctx, caller.TokenEndpoint(), request, Encoder, authFn)
 	if err != nil {
 		return nil, err
@@ -86,7 +95,15 @@ type EndSessionCaller interface {
 }
 
 func CallEndSessionEndpoint(ctx context.Context, request any, authFn any, caller EndSessionCaller) (*url.URL, error) {
-	req, err := httphelper.FormRequest(ctx, caller.GetEndSessionEndpoint(), request, Encoder, authFn)
+	ctx, span := Tracer.Start(ctx, "CallEndSessionEndpoint")
+	defer span.End()
+
+	endpoint := caller.GetEndSessionEndpoint()
+	if endpoint == "" {
+		return nil, fmt.Errorf("end session %w", ErrEndpointNotSet)
+	}
+
+	req, err := httphelper.FormRequest(ctx, endpoint, request, Encoder, authFn)
 	if err != nil {
 		return nil, err
 	}
@@ -129,7 +146,15 @@ type RevokeRequest struct {
 }
 
 func CallRevokeEndpoint(ctx context.Context, request any, authFn any, caller RevokeCaller) error {
-	req, err := httphelper.FormRequest(ctx, caller.GetRevokeEndpoint(), request, Encoder, authFn)
+	ctx, span := Tracer.Start(ctx, "CallRevokeEndpoint")
+	defer span.End()
+
+	endpoint := caller.GetRevokeEndpoint()
+	if endpoint == "" {
+		return fmt.Errorf("revoke %w", ErrEndpointNotSet)
+	}
+
+	req, err := httphelper.FormRequest(ctx, endpoint, request, Encoder, authFn)
 	if err != nil {
 		return err
 	}
@@ -157,6 +182,9 @@ func CallRevokeEndpoint(ctx context.Context, request any, authFn any, caller Rev
 }
 
 func CallTokenExchangeEndpoint(ctx context.Context, request any, authFn any, caller TokenEndpointCaller) (resp *oidc.TokenExchangeResponse, err error) {
+	ctx, span := Tracer.Start(ctx, "CallTokenExchangeEndpoint")
+	defer span.End()
+
 	req, err := httphelper.FormRequest(ctx, caller.TokenEndpoint(), request, Encoder, authFn)
 	if err != nil {
 		return nil, err
@@ -169,12 +197,12 @@ func CallTokenExchangeEndpoint(ctx context.Context, request any, authFn any, cal
 }
 
 func NewSignerFromPrivateKeyByte(key []byte, keyID string) (jose.Signer, error) {
-	privateKey, err := crypto.BytesToPrivateKey(key)
+	privateKey, algorithm, err := crypto.BytesToPrivateKey(key)
 	if err != nil {
 		return nil, err
 	}
 	signingKey := jose.SigningKey{
-		Algorithm: jose.RS256,
+		Algorithm: algorithm,
 		Key:       &jose.JSONWebKey{Key: privateKey, KeyID: keyID},
 	}
 	return jose.NewSigner(signingKey, &jose.SignerOptions{})
@@ -198,7 +226,15 @@ type DeviceAuthorizationCaller interface {
 }
 
 func CallDeviceAuthorizationEndpoint(ctx context.Context, request *oidc.ClientCredentialsRequest, caller DeviceAuthorizationCaller, authFn any) (*oidc.DeviceAuthorizationResponse, error) {
-	req, err := httphelper.FormRequest(ctx, caller.GetDeviceAuthorizationEndpoint(), request, Encoder, authFn)
+	ctx, span := Tracer.Start(ctx, "CallDeviceAuthorizationEndpoint")
+	defer span.End()
+
+	endpoint := caller.GetDeviceAuthorizationEndpoint()
+	if endpoint == "" {
+		return nil, fmt.Errorf("device authorization %w", ErrEndpointNotSet)
+	}
+
+	req, err := httphelper.FormRequest(ctx, endpoint, request, Encoder, authFn)
 	if err != nil {
 		return nil, err
 	}
@@ -219,6 +255,9 @@ type DeviceAccessTokenRequest struct {
 }
 
 func CallDeviceAccessTokenEndpoint(ctx context.Context, request *DeviceAccessTokenRequest, caller TokenEndpointCaller) (*oidc.AccessTokenResponse, error) {
+	ctx, span := Tracer.Start(ctx, "CallDeviceAccessTokenEndpoint")
+	defer span.End()
+
 	req, err := httphelper.FormRequest(ctx, caller.TokenEndpoint(), request, Encoder, nil)
 	if err != nil {
 		return nil, err
@@ -227,28 +266,17 @@ func CallDeviceAccessTokenEndpoint(ctx context.Context, request *DeviceAccessTok
 		req.SetBasicAuth(request.ClientID, request.ClientSecret)
 	}
 
-	httpResp, err := caller.HttpClient().Do(req)
+	resp := new(oidc.AccessTokenResponse)
-	if err != nil {
+	if err := httphelper.HttpRequest(caller.HttpClient(), req, &resp); err != nil {
 		return nil, err
 	}
-	defer httpResp.Body.Close()
+	return resp, nil
-
-	resp := new(struct {
-		*oidc.AccessTokenResponse
-		*oidc.Error
-	})
-	if err = json.NewDecoder(httpResp.Body).Decode(resp); err != nil {
-		return nil, err
-	}
-
-	if httpResp.StatusCode == http.StatusOK {
-		return resp.AccessTokenResponse, nil
-	}
-
-	return nil, resp.Error
 }
 
 func PollDeviceAccessTokenEndpoint(ctx context.Context, interval time.Duration, request *DeviceAccessTokenRequest, caller TokenEndpointCaller) (*oidc.AccessTokenResponse, error) {
+	ctx, span := Tracer.Start(ctx, "PollDeviceAccessTokenEndpoint")
+	defer span.End()
+
 	for {
 		timer := time.After(interval)
 		select {

pkg/client/client_test.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"testing"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -22,7 +23,7 @@ func TestDiscover(t *testing.T) {
 		name       string
 		args       args
 		wantFields *wantFields
-		wantErr    bool
+		wantErr    error
 	}{
 		{
 			name: "spotify", // https://github.com/zitadel/oidc/issues/406
@@ -32,17 +33,20 @@ func TestDiscover(t *testing.T) {
 			wantFields: &wantFields{
 				UILocalesSupported: true,
 			},
-			wantErr: false,
+			wantErr: nil,
+		},
+		{
+			name: "discovery failed",
+			args: args{
+				issuer: "https://example.com",
+			},
+			wantErr: oidc.ErrDiscoveryFailed,
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			got, err := Discover(context.Background(), tt.args.issuer, http.DefaultClient, tt.args.wellKnownUrl...)
-			if tt.wantErr {
+			require.ErrorIs(t, err, tt.wantErr)
-				assert.Error(t, err)
-				return
-			}
-			require.NoError(t, err)
 			if tt.wantFields == nil {
 				return
 			}

pkg/client/errors.go

@@ -0,0 +1,5 @@
+package client
+
+import "errors"
+
+var ErrEndpointNotSet = errors.New("endpoint not set")

pkg/client/integration_test.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"log/slog"
 	"math/rand"
 	"net/http"
 	"net/http/cookiejar"
@@ -20,16 +21,16 @@ import (
 	"github.com/jeremija/gosubmit"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"golang.org/x/exp/slog"
+	"golang.org/x/oauth2"
 
-	"github.com/zitadel/oidc/v3/example/server/exampleop"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/exampleop"
-	"github.com/zitadel/oidc/v3/example/server/storage"
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/storage"
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	"github.com/zitadel/oidc/v3/pkg/client/rs"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rs"
-	"github.com/zitadel/oidc/v3/pkg/client/tokenexchange"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/tokenexchange"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 )
 
 var Logger = slog.New(
@@ -110,6 +111,92 @@ func testRelyingPartySession(t *testing.T, wrapServer bool) {
 	}
 }
 
+func TestRelyingPartyWithSigningAlgsFromDiscovery(t *testing.T) {
+	targetURL := "http://local-site"
+	localURL, err := url.Parse(targetURL + "/login?requestID=1234")
+	require.NoError(t, err, "local url")
+
+	t.Log("------- start example OP ------")
+	seed := rand.New(rand.NewSource(int64(os.Getpid()) + time.Now().UnixNano()))
+	clientID := t.Name() + "-" + strconv.FormatInt(seed.Int63(), 25)
+	clientSecret := "secret"
+	client := storage.WebClient(clientID, clientSecret, targetURL)
+	storage.RegisterClients(client)
+	exampleStorage := storage.NewStorage(storage.NewUserStore(targetURL))
+	var dh deferredHandler
+	opServer := httptest.NewServer(&dh)
+	defer opServer.Close()
+	dh.Handler = exampleop.SetupServer(opServer.URL, exampleStorage, Logger, true)
+
+	t.Log("------- create RP ------")
+	provider, err := rp.NewRelyingPartyOIDC(
+		CTX,
+		opServer.URL,
+		clientID,
+		clientSecret,
+		targetURL,
+		[]string{"openid"},
+		rp.WithSigningAlgsFromDiscovery(),
+	)
+	require.NoError(t, err, "new rp")
+
+	t.Log("------- run authorization code flow ------")
+	jar, err := cookiejar.New(nil)
+	require.NoError(t, err, "create cookie jar")
+	httpClient := &http.Client{
+		Timeout: time.Second * 5,
+		CheckRedirect: func(_ *http.Request, _ []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+		Jar: jar,
+	}
+	state := "state-" + strconv.FormatInt(seed.Int63(), 25)
+	capturedW := httptest.NewRecorder()
+	get := httptest.NewRequest("GET", localURL.String(), nil)
+	rp.AuthURLHandler(func() string { return state }, provider,
+		rp.WithPromptURLParam("Hello, World!", "Goodbye, World!"),
+		rp.WithURLParam("custom", "param"),
+	)(capturedW, get)
+	defer func() {
+		if t.Failed() {
+			t.Log("response body (redirect from RP to OP)", capturedW.Body.String())
+		}
+	}()
+	resp := capturedW.Result()
+	startAuthURL, err := resp.Location()
+	require.NoError(t, err, "get redirect")
+	loginPageURL := getRedirect(t, "get redirect to login page", httpClient, startAuthURL)
+	form := getForm(t, "get login form", httpClient, loginPageURL)
+	defer func() {
+		if t.Failed() {
+			t.Logf("login form (unfilled): %s", string(form))
+		}
+	}()
+	postLoginRedirectURL := fillForm(t, "fill login form", httpClient, form, loginPageURL,
+		gosubmit.Set("username", "test-user@local-site"),
+		gosubmit.Set("password", "verysecure"),
+	)
+	codeBearingURL := getRedirect(t, "get redirect with code", httpClient, postLoginRedirectURL)
+	capturedW = httptest.NewRecorder()
+	get = httptest.NewRequest("GET", codeBearingURL.String(), nil)
+	var idToken string
+	redirect := func(w http.ResponseWriter, r *http.Request, newTokens *oidc.Tokens[*oidc.IDTokenClaims], state string, rp rp.RelyingParty, info *oidc.UserInfo) {
+		idToken = newTokens.IDToken
+		http.Redirect(w, r, targetURL, http.StatusFound)
+	}
+	rp.CodeExchangeHandler(rp.UserinfoCallback(redirect), provider)(capturedW, get)
+	defer func() {
+		if t.Failed() {
+			t.Log("token exchange response body", capturedW.Body.String())
+			require.GreaterOrEqual(t, capturedW.Code, 200, "captured response code")
+		}
+	}()
+
+	t.Log("------- verify id token ------")
+	_, err = rp.VerifyIDToken[*oidc.IDTokenClaims](CTX, idToken, provider.IDTokenVerifier())
+	require.NoError(t, err, "verify id token")
+}
+
 func TestResourceServerTokenExchange(t *testing.T) {
 	for _, wrapServer := range []bool{false, true} {
 		t.Run(fmt.Sprint("wrapServer ", wrapServer), func(t *testing.T) {
@@ -217,6 +304,7 @@ func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID,
 		targetURL,
 		[]string{"openid", "email", "profile", "offline_access"},
 		rp.WithPKCE(cookieHandler),
+		rp.WithAuthStyle(oauth2.AuthStyleInHeader),
 		rp.WithVerifierOpts(
 			rp.WithIssuedAtOffset(5*time.Second),
 			rp.WithSupportedSigningAlgorithms("RS256", "RS384", "RS512", "ES256", "ES384", "ES512"),
@@ -323,6 +411,31 @@ func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID,
 	return provider, tokens
 }
 
+func TestClientCredentials(t *testing.T) {
+	targetURL := "http://local-site"
+	exampleStorage := storage.NewStorage(storage.NewUserStore(targetURL))
+	var dh deferredHandler
+	opServer := httptest.NewServer(&dh)
+	defer opServer.Close()
+	t.Logf("auth server at %s", opServer.URL)
+	dh.Handler = exampleop.SetupServer(opServer.URL, exampleStorage, Logger, true)
+
+	provider, err := rp.NewRelyingPartyOIDC(
+		CTX,
+		opServer.URL,
+		"sid1",
+		"verysecret",
+		targetURL,
+		[]string{"openid"},
+	)
+	require.NoError(t, err, "new rp")
+
+	token, err := rp.ClientCredentials(CTX, provider, nil)
+	require.NoError(t, err, "ClientCredentials call")
+	require.NotNil(t, token)
+	assert.NotEmpty(t, token.AccessToken)
+}
+
 func TestErrorFromPromptNone(t *testing.T) {
 	jar, err := cookiejar.New(nil)
 	require.NoError(t, err, "create cookie jar")

pkg/client/jwt_profile.go

@@ -6,8 +6,8 @@ import (
 
 	"golang.org/x/oauth2"
 
-	"github.com/zitadel/oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 // JWTProfileExchange handles the oauth2 jwt profile exchange

pkg/client/key.go

@@ -2,7 +2,7 @@ package client
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 )
 
 const (
@@ -24,7 +24,7 @@ type KeyFile struct {
 }
 
 func ConfigFromKeyFile(path string) (*KeyFile, error) {
-	data, err := ioutil.ReadFile(path)
+	data, err := os.ReadFile(path)
 	if err != nil {
 		return nil, err
 	}

pkg/client/profile/jwt_profile.go

@@ -5,11 +5,11 @@ import (
 	"net/http"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"golang.org/x/oauth2"
 
-	"github.com/zitadel/oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type TokenSource interface {

pkg/client/rp/cli/cli.go

@@ -4,9 +4,9 @@ import (
 	"context"
 	"net/http"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 const (

pkg/client/rp/delegation.go

@@ -1,7 +1,7 @@
 package rp
 
 import (
-	"github.com/zitadel/oidc/v3/pkg/oidc/grants/tokenexchange"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc/grants/tokenexchange"
 )
 
 // DelegationTokenRequest is an implementation of TokenExchangeRequest

pkg/client/rp/device.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/zitadel/oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 func newDeviceClientCredentialsRequest(scopes []string, rp RelyingParty) (*oidc.ClientCredentialsRequest, error) {
@@ -33,6 +33,9 @@ func newDeviceClientCredentialsRequest(scopes []string, rp RelyingParty) (*oidc.
 // in RFC 8628, section 3.1 and 3.2:
 // https://www.rfc-editor.org/rfc/rfc8628#section-3.1
 func DeviceAuthorization(ctx context.Context, scopes []string, rp RelyingParty, authFn any) (*oidc.DeviceAuthorizationResponse, error) {
+	ctx, span := client.Tracer.Start(ctx, "DeviceAuthorization")
+	defer span.End()
+
 	ctx = logCtxWithRPData(ctx, rp, "function", "DeviceAuthorization")
 	req, err := newDeviceClientCredentialsRequest(scopes, rp)
 	if err != nil {
@@ -46,6 +49,9 @@ func DeviceAuthorization(ctx context.Context, scopes []string, rp RelyingParty,
 // by means of polling as defined in RFC, section 3.3 and 3.4:
 // https://www.rfc-editor.org/rfc/rfc8628#section-3.4
 func DeviceAccessToken(ctx context.Context, deviceCode string, interval time.Duration, rp RelyingParty) (resp *oidc.AccessTokenResponse, err error) {
+	ctx, span := client.Tracer.Start(ctx, "DeviceAccessToken")
+	defer span.End()
+
 	ctx = logCtxWithRPData(ctx, rp, "function", "DeviceAccessToken")
 	req := &client.DeviceAccessTokenRequest{
 		DeviceAccessTokenRequest: oidc.DeviceAccessTokenRequest{

pkg/client/rp/errors.go

@@ -0,0 +1,5 @@
+package rp
+
+import "errors"
+
+var ErrRelyingPartyNotSupportRevokeCaller = errors.New("RelyingParty does not support RevokeCaller")

pkg/client/rp/jwks.go

@@ -7,10 +7,11 @@ import (
 	"net/http"
 	"sync"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 func NewRemoteKeySet(client *http.Client, jwksURL string, opts ...func(*remoteKeySet)) oidc.KeySet {
@@ -83,6 +84,9 @@ func (i *inflight) result() ([]jose.JSONWebKey, error) {
 }
 
 func (r *remoteKeySet) VerifySignature(ctx context.Context, jws *jose.JSONWebSignature) ([]byte, error) {
+	ctx, span := client.Tracer.Start(ctx, "VerifySignature")
+	defer span.End()
+
 	keyID, alg := oidc.GetKeyIDAndAlg(jws)
 	if alg == "" {
 		alg = r.defaultAlg
@@ -135,6 +139,9 @@ func (r *remoteKeySet) exactMatch(jwkID, jwsID string) bool {
 }
 
 func (r *remoteKeySet) verifySignatureRemote(ctx context.Context, jws *jose.JSONWebSignature, keyID, alg string) ([]byte, error) {
+	ctx, span := client.Tracer.Start(ctx, "verifySignatureRemote")
+	defer span.End()
+
 	keys, err := r.keysFromRemote(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("unable to fetch key for signature validation: %w", err)
@@ -159,6 +166,9 @@ func (r *remoteKeySet) keysFromCache() (keys []jose.JSONWebKey) {
 // keysFromRemote syncs the key set from the remote set, records the values in the
 // cache, and returns the key set.
 func (r *remoteKeySet) keysFromRemote(ctx context.Context) ([]jose.JSONWebKey, error) {
+	ctx, span := client.Tracer.Start(ctx, "keysFromRemote")
+	defer span.End()
+
 	// Need to lock to inspect the inflight request field.
 	r.mu.Lock()
 	// If there's not a current inflight request, create one.
@@ -182,6 +192,9 @@ func (r *remoteKeySet) keysFromRemote(ctx context.Context) ([]jose.JSONWebKey, e
 }
 
 func (r *remoteKeySet) updateKeys(ctx context.Context) {
+	ctx, span := client.Tracer.Start(ctx, "updateKeys")
+	defer span.End()
+
 	// Sync keys and finish inflight when that's done.
 	keys, err := r.fetchRemoteKeys(ctx)
 
@@ -201,7 +214,10 @@ func (r *remoteKeySet) updateKeys(ctx context.Context) {
 }
 
 func (r *remoteKeySet) fetchRemoteKeys(ctx context.Context) ([]jose.JSONWebKey, error) {
-	req, err := http.NewRequest("GET", r.jwksURL, nil)
+	ctx, span := client.Tracer.Start(ctx, "fetchRemoteKeys")
+	defer span.End()
+
+	req, err := http.NewRequestWithContext(ctx, "GET", r.jwksURL, nil)
 	if err != nil {
 		return nil, fmt.Errorf("oidc: can't create request: %v", err)
 	}

pkg/client/rp/log.go

@@ -2,9 +2,9 @@ package rp
 
 import (
 	"context"
+	"log/slog"
 
 	"github.com/zitadel/logging"
-	"golang.org/x/exp/slog"
 )
 
 func logCtxWithRPData(ctx context.Context, rp RelyingParty, attrs ...any) context.Context {

pkg/client/rp/relying_party.go

@@ -4,20 +4,20 @@ import (
 	"context"
 	"encoding/base64"
 	"errors"
-	"fmt"
+	"log/slog"
 	"net/http"
 	"net/url"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	"github.com/go-jose/go-jose/v4"
 	"github.com/google/uuid"
-	"github.com/zitadel/logging"
-	"golang.org/x/exp/slog"
 	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/clientcredentials"
 
-	"github.com/zitadel/oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	"github.com/zitadel/logging"
 )
 
 const (
@@ -60,42 +60,55 @@ type RelyingParty interface {
 	// UserinfoEndpoint returns the userinfo
 	UserinfoEndpoint() string
 
-	// GetDeviceAuthorizationEndpoint returns the enpoint which can
+	// GetDeviceAuthorizationEndpoint returns the endpoint which can
 	// be used to start a DeviceAuthorization flow.
 	GetDeviceAuthorizationEndpoint() string
 
 	// IDTokenVerifier returns the verifier used for oidc id_token verification
 	IDTokenVerifier() *IDTokenVerifier
-	// ErrorHandler returns the handler used for callback errors
 
+	// ErrorHandler returns the handler used for callback errors
 	ErrorHandler() func(http.ResponseWriter, *http.Request, string, string, string)
 
 	// Logger from the context, or a fallback if set.
 	Logger(context.Context) (logger *slog.Logger, ok bool)
 }
 
+type HasUnauthorizedHandler interface {
+	// UnauthorizedHandler returns the handler used for unauthorized errors
+	UnauthorizedHandler() func(w http.ResponseWriter, r *http.Request, desc string, state string)
+}
+
 type ErrorHandler func(w http.ResponseWriter, r *http.Request, errorType string, errorDesc string, state string)
+type UnauthorizedHandler func(w http.ResponseWriter, r *http.Request, desc string, state string)
 
 var DefaultErrorHandler ErrorHandler = func(w http.ResponseWriter, r *http.Request, errorType string, errorDesc string, state string) {
 	http.Error(w, errorType+": "+errorDesc, http.StatusInternalServerError)
 }
+var DefaultUnauthorizedHandler UnauthorizedHandler = func(w http.ResponseWriter, r *http.Request, desc string, state string) {
+	http.Error(w, desc, http.StatusUnauthorized)
+}
 
 type relyingParty struct {
-	issuer            string
+	issuer                      string
-	DiscoveryEndpoint string
+	DiscoveryEndpoint           string
-	endpoints         Endpoints
+	endpoints                   Endpoints
-	oauthConfig       *oauth2.Config
+	oauthConfig                 *oauth2.Config
-	oauth2Only        bool
+	oauth2Only                  bool
-	pkce              bool
+	pkce                        bool
+	useSigningAlgsFromDiscovery bool
 
 	httpClient    *http.Client
 	cookieHandler *httphelper.CookieHandler
 
-	errorHandler    func(http.ResponseWriter, *http.Request, string, string, string)
+	oauthAuthStyle oauth2.AuthStyle
-	idTokenVerifier *IDTokenVerifier
+
-	verifierOpts    []VerifierOption
+	errorHandler        func(http.ResponseWriter, *http.Request, string, string, string)
-	signer          jose.Signer
+	unauthorizedHandler func(http.ResponseWriter, *http.Request, string, string)
-	logger          *slog.Logger
+	idTokenVerifier     *IDTokenVerifier
+	verifierOpts        []VerifierOption
+	signer              jose.Signer
+	logger              *slog.Logger
 }
 
 func (rp *relyingParty) OAuthConfig() *oauth2.Config {
@@ -156,6 +169,13 @@ func (rp *relyingParty) ErrorHandler() func(http.ResponseWriter, *http.Request,
 	return rp.errorHandler
 }
 
+func (rp *relyingParty) UnauthorizedHandler() func(http.ResponseWriter, *http.Request, string, string) {
+	if rp.unauthorizedHandler == nil {
+		rp.unauthorizedHandler = DefaultUnauthorizedHandler
+	}
+	return rp.unauthorizedHandler
+}
+
 func (rp *relyingParty) Logger(ctx context.Context) (logger *slog.Logger, ok bool) {
 	logger, ok = logging.FromContext(ctx)
 	if ok {
@@ -169,9 +189,11 @@ func (rp *relyingParty) Logger(ctx context.Context) (logger *slog.Logger, ok boo
 // it will use the AuthURL and TokenURL set in config
 func NewRelyingPartyOAuth(config *oauth2.Config, options ...Option) (RelyingParty, error) {
 	rp := &relyingParty{
-		oauthConfig: config,
+		oauthConfig:         config,
-		httpClient:  httphelper.DefaultHTTPClient,
+		httpClient:          httphelper.DefaultHTTPClient,
-		oauth2Only:  true,
+		oauth2Only:          true,
+		unauthorizedHandler: DefaultUnauthorizedHandler,
+		oauthAuthStyle:      oauth2.AuthStyleAutoDetect,
 	}
 
 	for _, optFunc := range options {
@@ -180,9 +202,12 @@ func NewRelyingPartyOAuth(config *oauth2.Config, options ...Option) (RelyingPart
 		}
 	}
 
+	rp.oauthConfig.Endpoint.AuthStyle = rp.oauthAuthStyle
+
 	// avoid races by calling these early
-	_ = rp.IDTokenVerifier() // sets idTokenVerifier
+	_ = rp.IDTokenVerifier()     // sets idTokenVerifier
-	_ = rp.ErrorHandler()    // sets errorHandler
+	_ = rp.ErrorHandler()        // sets errorHandler
+	_ = rp.UnauthorizedHandler() // sets unauthorizedHandler
 
 	return rp, nil
 }
@@ -199,8 +224,9 @@ func NewRelyingPartyOIDC(ctx context.Context, issuer, clientID, clientSecret, re
 			RedirectURL:  redirectURI,
 			Scopes:       scopes,
 		},
-		httpClient: httphelper.DefaultHTTPClient,
+		httpClient:     httphelper.DefaultHTTPClient,
-		oauth2Only: false,
+		oauth2Only:     false,
+		oauthAuthStyle: oauth2.AuthStyleAutoDetect,
 	}
 
 	for _, optFunc := range options {
@@ -213,13 +239,20 @@ func NewRelyingPartyOIDC(ctx context.Context, issuer, clientID, clientSecret, re
 	if err != nil {
 		return nil, err
 	}
+	if rp.useSigningAlgsFromDiscovery {
+		rp.verifierOpts = append(rp.verifierOpts, WithSupportedSigningAlgorithms(discoveryConfiguration.IDTokenSigningAlgValuesSupported...))
+	}
 	endpoints := GetEndpoints(discoveryConfiguration)
 	rp.oauthConfig.Endpoint = endpoints.Endpoint
 	rp.endpoints = endpoints
 
+	rp.oauthConfig.Endpoint.AuthStyle = rp.oauthAuthStyle
+	rp.endpoints.Endpoint.AuthStyle = rp.oauthAuthStyle
+
 	// avoid races by calling these early
-	_ = rp.IDTokenVerifier() // sets idTokenVerifier
+	_ = rp.IDTokenVerifier()     // sets idTokenVerifier
-	_ = rp.ErrorHandler()    // sets errorHandler
+	_ = rp.ErrorHandler()        // sets errorHandler
+	_ = rp.UnauthorizedHandler() // sets unauthorizedHandler
 
 	return rp, nil
 }
@@ -268,6 +301,20 @@ func WithErrorHandler(errorHandler ErrorHandler) Option {
 	}
 }
 
+func WithUnauthorizedHandler(unauthorizedHandler UnauthorizedHandler) Option {
+	return func(rp *relyingParty) error {
+		rp.unauthorizedHandler = unauthorizedHandler
+		return nil
+	}
+}
+
+func WithAuthStyle(oauthAuthStyle oauth2.AuthStyle) Option {
+	return func(rp *relyingParty) error {
+		rp.oauthAuthStyle = oauthAuthStyle
+		return nil
+	}
+}
+
 func WithVerifierOpts(opts ...VerifierOption) Option {
 	return func(rp *relyingParty) error {
 		rp.verifierOpts = opts
@@ -305,6 +352,15 @@ func WithLogger(logger *slog.Logger) Option {
 	}
 }
 
+// WithSigningAlgsFromDiscovery appends the [WithSupportedSigningAlgorithms] option to the Verifier Options.
+// The algorithms returned in the `id_token_signing_alg_values_supported` from the discovery response will be set.
+func WithSigningAlgsFromDiscovery() Option {
+	return func(rp *relyingParty) error {
+		rp.useSigningAlgsFromDiscovery = true
+		return nil
+	}
+}
+
 type SignerFromKey func() (jose.Signer, error)
 
 func SignerFromKeyPath(path string) SignerFromKey {
@@ -345,7 +401,7 @@ func AuthURL(state string, rp RelyingParty, opts ...AuthURLOpt) string {
 
 // AuthURLHandler extends the `AuthURL` method with a http redirect handler
 // including handling setting cookie for secure `state` transfer.
-// Custom paramaters can optionally be set to the redirect URL.
+// Custom parameters can optionally be set to the redirect URL.
 func AuthURLHandler(stateFn func() string, rp RelyingParty, urlParam ...URLParamOpt) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		opts := make([]AuthURLOpt, len(urlParam))
@@ -355,13 +411,13 @@ func AuthURLHandler(stateFn func() string, rp RelyingParty, urlParam ...URLParam
 
 		state := stateFn()
 		if err := trySetStateCookie(w, state, rp); err != nil {
-			http.Error(w, "failed to create state cookie: "+err.Error(), http.StatusUnauthorized)
+			unauthorizedError(w, r, "failed to create state cookie: "+err.Error(), state, rp)
 			return
 		}
 		if rp.IsPKCE() {
 			codeChallenge, err := GenerateAndStoreCodeChallenge(w, rp)
 			if err != nil {
-				http.Error(w, "failed to create code challenge: "+err.Error(), http.StatusUnauthorized)
+				unauthorizedError(w, r, "failed to create code challenge: "+err.Error(), state, rp)
 				return
 			}
 			opts = append(opts, WithCodeChallenge(codeChallenge))
@@ -385,6 +441,9 @@ func GenerateAndStoreCodeChallenge(w http.ResponseWriter, rp RelyingParty) (stri
 var ErrMissingIDToken = errors.New("id_token missing")
 
 func verifyTokenResponse[C oidc.IDClaims](ctx context.Context, token *oauth2.Token, rp RelyingParty) (*oidc.Tokens[C], error) {
+	ctx, span := client.Tracer.Start(ctx, "verifyTokenResponse")
+	defer span.End()
+
 	if rp.IsOAuth2Only() {
 		return &oidc.Tokens[C]{Token: token}, nil
 	}
@@ -402,6 +461,9 @@ func verifyTokenResponse[C oidc.IDClaims](ctx context.Context, token *oauth2.Tok
 // CodeExchange handles the oauth2 code exchange, extracting and validating the id_token
 // returning it parsed together with the oauth2 tokens (access, refresh)
 func CodeExchange[C oidc.IDClaims](ctx context.Context, code string, rp RelyingParty, opts ...CodeExchangeOpt) (tokens *oidc.Tokens[C], err error) {
+	ctx, codeExchangeSpan := client.Tracer.Start(ctx, "CodeExchange")
+	defer codeExchangeSpan.End()
+
 	ctx = logCtxWithRPData(ctx, rp, "function", "CodeExchange")
 	ctx = context.WithValue(ctx, oauth2.HTTPClient, rp.HttpClient())
 	codeOpts := make([]oauth2.AuthCodeOption, 0)
@@ -409,29 +471,59 @@ func CodeExchange[C oidc.IDClaims](ctx context.Context, code string, rp RelyingP
 		codeOpts = append(codeOpts, opt()...)
 	}
 
+	ctx, oauthExchangeSpan := client.Tracer.Start(ctx, "OAuthExchange")
 	token, err := rp.OAuthConfig().Exchange(ctx, code, codeOpts...)
 	if err != nil {
 		return nil, err
 	}
+	oauthExchangeSpan.End()
 	return verifyTokenResponse[C](ctx, token, rp)
 }
 
+// ClientCredentials requests an access token using the `client_credentials` grant,
+// as defined in [RFC 6749, section 4.4].
+//
+// As there is no user associated to the request an ID Token can never be returned.
+// Client Credentials are undefined in OpenID Connect and is a pure OAuth2 grant.
+// Furthermore the server SHOULD NOT return a refresh token.
+//
+// [RFC 6749, section 4.4]: https://datatracker.ietf.org/doc/html/rfc6749#section-4.4
+func ClientCredentials(ctx context.Context, rp RelyingParty, endpointParams url.Values) (token *oauth2.Token, err error) {
+	ctx = logCtxWithRPData(ctx, rp, "function", "ClientCredentials")
+	ctx, span := client.Tracer.Start(ctx, "ClientCredentials")
+	defer span.End()
+
+	ctx = context.WithValue(ctx, oauth2.HTTPClient, rp.HttpClient())
+	config := clientcredentials.Config{
+		ClientID:       rp.OAuthConfig().ClientID,
+		ClientSecret:   rp.OAuthConfig().ClientSecret,
+		TokenURL:       rp.OAuthConfig().Endpoint.TokenURL,
+		Scopes:         rp.OAuthConfig().Scopes,
+		EndpointParams: endpointParams,
+		AuthStyle:      rp.OAuthConfig().Endpoint.AuthStyle,
+	}
+	return config.Token(ctx)
+}
+
 type CodeExchangeCallback[C oidc.IDClaims] func(w http.ResponseWriter, r *http.Request, tokens *oidc.Tokens[C], state string, rp RelyingParty)
 
 // CodeExchangeHandler extends the `CodeExchange` method with a http handler
 // including cookie handling for secure `state` transfer
 // and optional PKCE code verifier checking.
-// Custom paramaters can optionally be set to the token URL.
+// Custom parameters can optionally be set to the token URL.
 func CodeExchangeHandler[C oidc.IDClaims](callback CodeExchangeCallback[C], rp RelyingParty, urlParam ...URLParamOpt) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		ctx, span := client.Tracer.Start(r.Context(), "CodeExchangeHandler")
+		r = r.WithContext(ctx)
+		defer span.End()
+
 		state, err := tryReadStateCookie(w, r, rp)
 		if err != nil {
-			http.Error(w, "failed to get state: "+err.Error(), http.StatusUnauthorized)
+			unauthorizedError(w, r, "failed to get state: "+err.Error(), state, rp)
 			return
 		}
-		params := r.URL.Query()
+		if errValue := r.FormValue("error"); errValue != "" {
-		if params.Get("error") != "" {
+			rp.ErrorHandler()(w, r, errValue, r.FormValue("error_description"), state)
-			rp.ErrorHandler()(w, r, params.Get("error"), params.Get("error_description"), state)
 			return
 		}
 		codeOpts := make([]CodeExchangeOpt, len(urlParam))
@@ -442,23 +534,23 @@ func CodeExchangeHandler[C oidc.IDClaims](callback CodeExchangeCallback[C], rp R
 		if rp.IsPKCE() {
 			codeVerifier, err := rp.CookieHandler().CheckCookie(r, pkceCode)
 			if err != nil {
-				http.Error(w, "failed to get code verifier: "+err.Error(), http.StatusUnauthorized)
+				unauthorizedError(w, r, "failed to get code verifier: "+err.Error(), state, rp)
 				return
 			}
 			codeOpts = append(codeOpts, WithCodeVerifier(codeVerifier))
 			rp.CookieHandler().DeleteCookie(w, pkceCode)
 		}
 		if rp.Signer() != nil {
-			assertion, err := client.SignedJWTProfileAssertion(rp.OAuthConfig().ClientID, []string{rp.Issuer()}, time.Hour, rp.Signer())
+			assertion, err := client.SignedJWTProfileAssertion(rp.OAuthConfig().ClientID, []string{rp.Issuer(), rp.OAuthConfig().Endpoint.TokenURL}, time.Hour, rp.Signer())
 			if err != nil {
-				http.Error(w, "failed to build assertion: "+err.Error(), http.StatusUnauthorized)
+				unauthorizedError(w, r, "failed to build assertion: "+err.Error(), state, rp)
 				return
 			}
 			codeOpts = append(codeOpts, WithClientAssertionJWT(assertion))
 		}
-		tokens, err := CodeExchange[C](r.Context(), params.Get("code"), rp, codeOpts...)
+		tokens, err := CodeExchange[C](r.Context(), r.FormValue("code"), rp, codeOpts...)
 		if err != nil {
-			http.Error(w, "failed to exchange token: "+err.Error(), http.StatusUnauthorized)
+			unauthorizedError(w, r, "failed to exchange token: "+err.Error(), state, rp)
 			return
 		}
 		callback(w, r, tokens, state, rp)
@@ -476,9 +568,13 @@ type CodeExchangeUserinfoCallback[C oidc.IDClaims, U SubjectGetter] func(w http.
 // on success it will pass the userinfo into its callback function as well
 func UserinfoCallback[C oidc.IDClaims, U SubjectGetter](f CodeExchangeUserinfoCallback[C, U]) CodeExchangeCallback[C] {
 	return func(w http.ResponseWriter, r *http.Request, tokens *oidc.Tokens[C], state string, rp RelyingParty) {
+		ctx, span := client.Tracer.Start(r.Context(), "UserinfoCallback")
+		r = r.WithContext(ctx)
+		defer span.End()
+
 		info, err := Userinfo[U](r.Context(), tokens.AccessToken, tokens.TokenType, tokens.IDTokenClaims.GetSubject(), rp)
 		if err != nil {
-			http.Error(w, "userinfo failed: "+err.Error(), http.StatusUnauthorized)
+			unauthorizedError(w, r, "userinfo failed: "+err.Error(), state, rp)
 			return
 		}
 		f(w, r, tokens, state, rp, info)
@@ -494,6 +590,8 @@ func UserinfoCallback[C oidc.IDClaims, U SubjectGetter](f CodeExchangeUserinfoCa
 func Userinfo[U SubjectGetter](ctx context.Context, token, tokenType, subject string, rp RelyingParty) (userinfo U, err error) {
 	var nilU U
 	ctx = logCtxWithRPData(ctx, rp, "function", "Userinfo")
+	ctx, span := client.Tracer.Start(ctx, "Userinfo")
+	defer span.End()
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, rp.UserinfoEndpoint(), nil)
 	if err != nil {
@@ -545,9 +643,8 @@ type Endpoints struct {
 func GetEndpoints(discoveryConfig *oidc.DiscoveryConfiguration) Endpoints {
 	return Endpoints{
 		Endpoint: oauth2.Endpoint{
-			AuthURL:   discoveryConfig.AuthorizationEndpoint,
+			AuthURL:  discoveryConfig.AuthorizationEndpoint,
-			AuthStyle: oauth2.AuthStyleAutoDetect,
+			TokenURL: discoveryConfig.TokenEndpoint,
-			TokenURL:  discoveryConfig.TokenEndpoint,
 		},
 		IntrospectURL:          discoveryConfig.IntrospectionEndpoint,
 		UserinfoURL:            discoveryConfig.UserinfoEndpoint,
@@ -558,7 +655,7 @@ func GetEndpoints(discoveryConfig *oidc.DiscoveryConfiguration) Endpoints {
 	}
 }
 
-// withURLParam sets custom url paramaters.
+// withURLParam sets custom url parameters.
 // This is the generalized, unexported, function used by both
 // URLParamOpt and AuthURLOpt.
 func withURLParam(key, value string) func() []oauth2.AuthCodeOption {
@@ -637,11 +734,11 @@ func (t tokenEndpointCaller) TokenEndpoint() string {
 
 type RefreshTokenRequest struct {
 	RefreshToken        string                   `schema:"refresh_token"`
-	Scopes              oidc.SpaceDelimitedArray `schema:"scope"`
+	Scopes              oidc.SpaceDelimitedArray `schema:"scope,omitempty"`
-	ClientID            string                   `schema:"client_id"`
+	ClientID            string                   `schema:"client_id,omitempty"`
-	ClientSecret        string                   `schema:"client_secret"`
+	ClientSecret        string                   `schema:"client_secret,omitempty"`
-	ClientAssertion     string                   `schema:"client_assertion"`
+	ClientAssertion     string                   `schema:"client_assertion,omitempty"`
-	ClientAssertionType string                   `schema:"client_assertion_type"`
+	ClientAssertionType string                   `schema:"client_assertion_type,omitempty"`
 	GrantType           oidc.GrantType           `schema:"grant_type"`
 }
 
@@ -650,9 +747,12 @@ type RefreshTokenRequest struct {
 // the old one should be considered invalid.
 //
 // In case the RP is not OAuth2 only and an IDToken was part of the response,
-// the IDToken and AccessToken will be verfied
+// the IDToken and AccessToken will be verified
 // and the IDToken and IDTokenClaims fields will be populated in the returned object.
 func RefreshTokens[C oidc.IDClaims](ctx context.Context, rp RelyingParty, refreshToken, clientAssertion, clientAssertionType string) (*oidc.Tokens[C], error) {
+	ctx, span := client.Tracer.Start(ctx, "RefreshTokens")
+	defer span.End()
+
 	ctx = logCtxWithRPData(ctx, rp, "function", "RefreshTokens")
 	request := RefreshTokenRequest{
 		RefreshToken:        refreshToken,
@@ -678,6 +778,9 @@ func RefreshTokens[C oidc.IDClaims](ctx context.Context, rp RelyingParty, refres
 
 func EndSession(ctx context.Context, rp RelyingParty, idToken, optionalRedirectURI, optionalState string) (*url.URL, error) {
 	ctx = logCtxWithRPData(ctx, rp, "function", "EndSession")
+	ctx, span := client.Tracer.Start(ctx, "RefreshTokens")
+	defer span.End()
+
 	request := oidc.EndSessionRequest{
 		IdTokenHint:           idToken,
 		ClientID:              rp.OAuthConfig().ClientID,
@@ -694,6 +797,8 @@ func EndSession(ctx context.Context, rp RelyingParty, idToken, optionalRedirectU
 // tokenTypeHint should be either "id_token" or "refresh_token".
 func RevokeToken(ctx context.Context, rp RelyingParty, token string, tokenTypeHint string) error {
 	ctx = logCtxWithRPData(ctx, rp, "function", "RevokeToken")
+	ctx, span := client.Tracer.Start(ctx, "RefreshTokens")
+	defer span.End()
 	request := client.RevokeRequest{
 		Token:         token,
 		TokenTypeHint: tokenTypeHint,
@@ -703,5 +808,13 @@ func RevokeToken(ctx context.Context, rp RelyingParty, token string, tokenTypeHi
 	if rc, ok := rp.(client.RevokeCaller); ok && rc.GetRevokeEndpoint() != "" {
 		return client.CallRevokeEndpoint(ctx, request, nil, rc)
 	}
-	return fmt.Errorf("RelyingParty does not support RevokeCaller")
+	return ErrRelyingPartyNotSupportRevokeCaller
+}
+
+func unauthorizedError(w http.ResponseWriter, r *http.Request, desc string, state string, rp RelyingParty) {
+	if rp, ok := rp.(HasUnauthorizedHandler); ok {
+		rp.UnauthorizedHandler()(w, r, desc, state)
+		return
+	}
+	http.Error(w, desc, http.StatusUnauthorized)
 }

pkg/client/rp/relying_party_test.go

@@ -5,10 +5,10 @@ import (
 	"testing"
 	"time"
 
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 	"golang.org/x/oauth2"
 )
 

pkg/client/rp/tockenexchange.go

@@ -5,7 +5,7 @@ import (
 
 	"golang.org/x/oauth2"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc/grants/tokenexchange"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc/grants/tokenexchange"
 )
 
 // TokenExchangeRP extends the `RelyingParty` interface for the *draft* oauth2 `Token Exchange`

pkg/client/rp/userinfo_example_test.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type UserInfo struct {

pkg/client/rp/verifier.go

@@ -4,14 +4,18 @@ import (
 	"context"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 // VerifyTokens implement the Token Response Validation as defined in OIDC specification
 // https://openid.net/specs/openid-connect-core-1_0.html#TokenResponseValidation
 func VerifyTokens[C oidc.IDClaims](ctx context.Context, accessToken, idToken string, v *IDTokenVerifier) (claims C, err error) {
+	ctx, span := client.Tracer.Start(ctx, "VerifyTokens")
+	defer span.End()
+
 	var nilClaims C
 
 	claims, err = VerifyIDToken[C](ctx, idToken, v)
@@ -27,6 +31,9 @@ func VerifyTokens[C oidc.IDClaims](ctx context.Context, accessToken, idToken str
 // VerifyIDToken validates the id token according to
 // https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation
 func VerifyIDToken[C oidc.Claims](ctx context.Context, token string, v *IDTokenVerifier) (claims C, err error) {
+	ctx, span := client.Tracer.Start(ctx, "VerifyIDToken")
+	defer span.End()
+
 	var nilClaims C
 
 	decrypted, err := oidc.DecryptToken(token)
@@ -66,8 +73,10 @@ func VerifyIDToken[C oidc.Claims](ctx context.Context, token string, v *IDTokenV
 		return nilClaims, err
 	}
 
-	if err = oidc.CheckNonce(claims, v.Nonce(ctx)); err != nil {
+	if v.Nonce != nil {
-		return nilClaims, err
+		if err = oidc.CheckNonce(claims, v.Nonce(ctx)); err != nil {
+			return nilClaims, err
+		}
 	}
 
 	if err = oidc.CheckAuthorizationContextClassReference(claims, v.ACR); err != nil {

pkg/client/rp/verifier_test.go

@@ -5,11 +5,11 @@ import (
 	"testing"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
 func TestVerifyTokens(t *testing.T) {
@@ -100,22 +100,21 @@ func TestVerifyIDToken(t *testing.T) {
 		MaxAge:            2 * time.Minute,
 		ACR:               tu.ACRVerify,
 		Nonce:             func(context.Context) string { return tu.ValidNonce },
+		ClientID:          tu.ValidClientID,
 	}
 
 	tests := []struct {
-		name        string
+		name           string
-		clientID    string
+		tokenClaims    func() (string, *oidc.IDTokenClaims)
-		tokenClaims func() (string, *oidc.IDTokenClaims)
+		customVerifier func(verifier *IDTokenVerifier)
-		wantErr     bool
+		wantErr        bool
 	}{
 		{
 			name:        "success",
-			clientID:    tu.ValidClientID,
 			tokenClaims: tu.ValidIDToken,
 		},
 		{
-			name:     "custom claims",
+			name: "custom claims",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDTokenCustom(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -125,21 +124,31 @@ func TestVerifyIDToken(t *testing.T) {
 				)
 			},
 		},
+		{
+			name: "skip nonce check",
+			customVerifier: func(verifier *IDTokenVerifier) {
+				verifier.Nonce = nil
+			},
+			tokenClaims: func() (string, *oidc.IDTokenClaims) {
+				return tu.NewIDToken(
+					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
+					tu.ValidExpiration, tu.ValidAuthTime, "foo",
+					tu.ValidACR, tu.ValidAMR, tu.ValidClientID, tu.ValidSkew, "",
+				)
+			},
+		},
 		{
 			name:        "parse err",
-			clientID:    tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) { return "~~~~", nil },
 			wantErr:     true,
 		},
 		{
 			name:        "invalid signature",
-			clientID:    tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) { return tu.InvalidSignatureToken, nil },
 			wantErr:     true,
 		},
 		{
-			name:     "empty subject",
+			name: "empty subject",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, "", tu.ValidAudience,
@@ -150,8 +159,7 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:     "wrong issuer",
+			name: "wrong issuer",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					"foo", tu.ValidSubject, tu.ValidAudience,
@@ -162,14 +170,15 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:        "wrong clientID",
+			name: "wrong clientID",
-			clientID:    "foo",
+			customVerifier: func(verifier *IDTokenVerifier) {
+				verifier.ClientID = "foo"
+			},
 			tokenClaims: tu.ValidIDToken,
 			wantErr:     true,
 		},
 		{
-			name:     "expired",
+			name: "expired",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -180,8 +189,7 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:     "wrong IAT",
+			name: "wrong IAT",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -192,8 +200,7 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:     "wrong acr",
+			name: "wrong acr",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -204,8 +211,7 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:     "expired auth",
+			name: "expired auth",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -216,8 +222,7 @@ func TestVerifyIDToken(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:     "wrong nonce",
+			name: "wrong nonce",
-			clientID: tu.ValidClientID,
 			tokenClaims: func() (string, *oidc.IDTokenClaims) {
 				return tu.NewIDToken(
 					tu.ValidIssuer, tu.ValidSubject, tu.ValidAudience,
@@ -231,7 +236,10 @@ func TestVerifyIDToken(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			token, want := tt.tokenClaims()
-			verifier.ClientID = tt.clientID
+			if tt.customVerifier != nil {
+				tt.customVerifier(verifier)
+			}
+
 			got, err := VerifyIDToken[*oidc.IDTokenClaims](context.Background(), token, verifier)
 			if tt.wantErr {
 				assert.Error(t, err)

pkg/client/rp/verifier_tokens_example_test.go

@@ -4,9 +4,9 @@ import (
 	"context"
 	"fmt"
 
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
-	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rp"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 // MyCustomClaims extends the TokenClaims base,

pkg/client/rs/introspect_example_test.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/zitadel/oidc/v3/pkg/client/rs"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client/rs"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type IntrospectionResponse struct {

pkg/client/rs/resource_server.go

@@ -6,9 +6,9 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/zitadel/oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type ResourceServer interface {
@@ -123,6 +123,9 @@ func WithStaticEndpoints(tokenURL, introspectURL string) Option {
 //
 // [RFC7662]: https://www.rfc-editor.org/rfc/rfc7662
 func Introspect[R any](ctx context.Context, rp ResourceServer, token string) (resp R, err error) {
+	ctx, span := client.Tracer.Start(ctx, "Introspect")
+	defer span.End()
+
 	if rp.IntrospectionURL() == "" {
 		return resp, errors.New("resource server: introspection URL is empty")
 	}

pkg/client/rs/resource_server_test.go

@@ -4,9 +4,9 @@ import (
 	"context"
 	"testing"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
 func TestNewResourceServer(t *testing.T) {
@@ -201,7 +201,7 @@ func TestIntrospect(t *testing.T) {
 		{
 			name: "missing-introspect-url",
 			args: args{
-				ctx:   nil,
+				ctx:   context.Background(),
 				rp:    rp,
 				token: "my-token",
 			},

pkg/client/tokenexchange/tokenexchange.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"time"
 
-	"github.com/zitadel/oidc/v3/pkg/client"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/client"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	"github.com/go-jose/go-jose/v4"
 )
 
 type TokenExchanger interface {
@@ -33,6 +35,17 @@ func NewTokenExchangerClientCredentials(ctx context.Context, issuer, clientID, c
 	return newOAuthTokenExchange(ctx, issuer, authorizer, options...)
 }
 
+func NewTokenExchangerJWTProfile(ctx context.Context, issuer, clientID string, signer jose.Signer, options ...func(source *OAuthTokenExchange)) (TokenExchanger, error) {
+	authorizer := func() (any, error) {
+		assertion, err := client.SignedJWTProfileAssertion(clientID, []string{issuer}, time.Hour, signer)
+		if err != nil {
+			return nil, err
+		}
+		return client.ClientAssertionFormAuthorization(assertion), nil
+	}
+	return newOAuthTokenExchange(ctx, issuer, authorizer, options...)
+}
+
 func newOAuthTokenExchange(ctx context.Context, issuer string, authorizer func() (any, error), options ...func(source *OAuthTokenExchange)) (*OAuthTokenExchange, error) {
 	te := &OAuthTokenExchange{
 		httpClient: httphelper.DefaultHTTPClient,
@@ -101,6 +114,9 @@ func ExchangeToken(
 	Scopes []string,
 	RequestedTokenType oidc.TokenType,
 ) (*oidc.TokenExchangeResponse, error) {
+	ctx, span := client.Tracer.Start(ctx, "ExchangeToken")
+	defer span.End()
+
 	if SubjectToken == "" {
 		return nil, errors.New("empty subject_token")
 	}

pkg/crypto/hash.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"hash"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 )
 
 var ErrUnsupportedAlgorithm = errors.New("unsupported signing algorithm")
@@ -21,6 +21,14 @@ func GetHashAlgorithm(sigAlgorithm jose.SignatureAlgorithm) (hash.Hash, error) {
 		return sha512.New384(), nil
 	case jose.RS512, jose.ES512, jose.PS512:
 		return sha512.New(), nil
+
+	// There is no published spec for this yet, but we have confirmation it will get published.
+	// There is consensus here: https://bitbucket.org/openid/connect/issues/1125/_hash-algorithm-for-eddsa-id-tokens
+	// Currently Go and go-jose only supports the ed25519 curve key for EdDSA, so we can safely assume sha512 here.
+	// It is unlikely ed448 will ever be supported: https://github.com/golang/go/issues/29390
+	case jose.EdDSA:
+		return sha512.New(), nil
+
 	default:
 		return nil, fmt.Errorf("%w: %q", ErrUnsupportedAlgorithm, sigAlgorithm)
 	}

pkg/crypto/key.go

@@ -1,17 +1,45 @@
 package crypto
 
 import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/pem"
+	"errors"
+
+	"github.com/go-jose/go-jose/v4"
 )
 
-func BytesToPrivateKey(priv []byte) (*rsa.PrivateKey, error) {
+var (
-	block, _ := pem.Decode(priv)
+	ErrPEMDecode             = errors.New("PEM decode failed")
-	b := block.Bytes
+	ErrUnsupportedFormat     = errors.New("key is neither in PKCS#1 nor PKCS#8 format")
-	key, err := x509.ParsePKCS1PrivateKey(b)
+	ErrUnsupportedPrivateKey = errors.New("unsupported key type, must be RSA, ECDSA or ED25519 private key")
-	if err != nil {
+)
-		return nil, err
+
+func BytesToPrivateKey(b []byte) (crypto.PublicKey, jose.SignatureAlgorithm, error) {
+	block, _ := pem.Decode(b)
+	if block == nil {
+		return nil, "", ErrPEMDecode
+	}
+
+	privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err == nil {
+		return privateKey, jose.RS256, nil
+	}
+	key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, "", ErrUnsupportedFormat
+	}
+	switch privateKey := key.(type) {
+	case *rsa.PrivateKey:
+		return privateKey, jose.RS256, nil
+	case ed25519.PrivateKey:
+		return privateKey, jose.EdDSA, nil
+	case *ecdsa.PrivateKey:
+		return privateKey, jose.ES256, nil
+	default:
+		return nil, "", ErrUnsupportedPrivateKey
 	}
-	return key, nil
 }

pkg/crypto/key_test.go

@@ -0,0 +1,134 @@
+package crypto_test
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/rsa"
+	"testing"
+
+	"github.com/go-jose/go-jose/v4"
+	"github.com/stretchr/testify/assert"
+
+	zcrypto "git.christmann.info/LARA/zitadel-oidc/v3/pkg/crypto"
+)
+
+func TestBytesToPrivateKey(t *testing.T) {
+	type args struct {
+		key []byte
+	}
+	type want struct {
+		key       crypto.Signer
+		algorithm jose.SignatureAlgorithm
+		err       error
+	}
+	tests := []struct {
+		name string
+		args args
+		want want
+	}{
+		{
+			name: "PEMDecodeError",
+			args: args{
+				key: []byte("The non-PEM sequence"),
+			},
+			want: want{
+				err: zcrypto.ErrPEMDecode,
+			},
+		},
+		{
+			name: "PKCS#1 RSA",
+			args: args{
+				key: []byte(`-----BEGIN RSA PRIVATE KEY-----
+MIIBOgIBAAJBAKj34GkxFhD90vcNLYLInFEX6Ppy1tPf9Cnzj4p4WGeKLs1Pt8Qu
+KUpRKfFLfRYC9AIKjbJTWit+CqvjWYzvQwECAwEAAQJAIJLixBy2qpFoS4DSmoEm
+o3qGy0t6z09AIJtH+5OeRV1be+N4cDYJKffGzDa88vQENZiRm0GRq6a+HPGQMd2k
+TQIhAKMSvzIBnni7ot/OSie2TmJLY4SwTQAevXysE2RbFDYdAiEBCUEaRQnMnbp7
+9mxDXDf6AU0cN/RPBjb9qSHDcWZHGzUCIG2Es59z8ugGrDY+pxLQnwfotadxd+Uy
+v/Ow5T0q5gIJAiEAyS4RaI9YG8EWx/2w0T67ZUVAw8eOMB6BIUg0Xcu+3okCIBOs
+/5OiPgoTdSy7bcF9IGpSE8ZgGKzgYQVZeN97YE00
+-----END RSA PRIVATE KEY-----`),
+			},
+			want: want{
+				key:       &rsa.PrivateKey{},
+				algorithm: jose.RS256,
+				err:       nil,
+			},
+		},
+		{
+			name: "PKCS#8 RSA",
+			args: args{
+				key: []byte(`-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----`),
+			},
+			want: want{
+				key:       &rsa.PrivateKey{},
+				algorithm: jose.RS256,
+				err:       nil,
+			},
+		},
+		{
+			name: "PKCS#8 ECDSA",
+			args: args{
+				key: []byte(`-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgwwOZSU4GlP7ps/Wp
+V6o0qRwxultdfYo/uUuj48QZjSuhRANCAATMiI2Han+ABKmrk5CNlxRAGC61w4d3
+G4TAeuBpyzqJ7x/6NjCxoQzJzZHtNjIfjVATI59XFZWF59GhtSZbShAr
+-----END PRIVATE KEY-----`),
+			},
+			want: want{
+				key:       &ecdsa.PrivateKey{},
+				algorithm: jose.ES256,
+				err:       nil,
+			},
+		},
+		{
+			name: "PKCS#8 ED25519",
+			args: args{
+				key: []byte(`-----BEGIN PRIVATE KEY-----
+MC4CAQAwBQYDK2VwBCIEIHu6ZtDsjjauMasBxnS9Fg87UJwKfcT/oiq6S0ktbky8
+-----END PRIVATE KEY-----`),
+			},
+			want: want{
+				key:       ed25519.PrivateKey{},
+				algorithm: jose.EdDSA,
+				err:       nil,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			key, algorithm, err := zcrypto.BytesToPrivateKey(tt.args.key)
+			assert.IsType(t, tt.want.key, key)
+			assert.Equal(t, tt.want.algorithm, algorithm)
+			assert.ErrorIs(t, tt.want.err, err)
+		})
+
+	}
+}

pkg/crypto/sign.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 )
 
 func Sign(object any, signer jose.Signer) (string, error) {

pkg/http/http.go

@@ -10,6 +10,8 @@ import (
 	"net/url"
 	"strings"
 	"time"
+
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 var DefaultHTTPClient = &http.Client{
@@ -66,7 +68,12 @@ func HttpRequest(client *http.Client, req *http.Request, response any) error {
 	}
 
 	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("http status not ok: %s %s", resp.Status, body)
+		var oidcErr oidc.Error
+		err = json.Unmarshal(body, &oidcErr)
+		if err != nil || oidcErr.ErrorType == "" {
+			return fmt.Errorf("http status not ok: %s %s", resp.Status, body)
+		}
+		return &oidcErr
 	}
 
 	err = json.Unmarshal(body, response)

pkg/oidc/authorization.go

@@ -1,7 +1,7 @@
 package oidc
 
 import (
-	"golang.org/x/exp/slog"
+	"log/slog"
 )
 
 const (
@@ -48,6 +48,7 @@ const (
 
 	ResponseModeQuery    ResponseMode = "query"
 	ResponseModeFragment ResponseMode = "fragment"
+	ResponseModeFormPost ResponseMode = "form_post"
 
 	// PromptNone (`none`) disallows the Authorization Server to display any authentication or consent user interface pages.
 	// An error (login_required, interaction_required, ...) will be returned if the user is not already authenticated or consent is needed

pkg/oidc/authorization_test.go

@@ -3,10 +3,10 @@
 package oidc
 
 import (
+	"log/slog"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"golang.org/x/exp/slog"
 )
 
 func TestAuthRequest_LogValue(t *testing.T) {

pkg/oidc/code_challenge.go

@@ -3,7 +3,7 @@ package oidc
 import (
 	"crypto/sha256"
 
-	"github.com/zitadel/oidc/v3/pkg/crypto"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/crypto"
 )
 
 const (

pkg/oidc/device_authorization.go

@@ -1,5 +1,7 @@
 package oidc
 
+import "encoding/json"
+
 // DeviceAuthorizationRequest implements
 // https://www.rfc-editor.org/rfc/rfc8628#section-3.1,
 // 3.1 Device Authorization Request.
@@ -20,6 +22,26 @@ type DeviceAuthorizationResponse struct {
 	Interval                int    `json:"interval,omitempty"`
 }
 
+func (resp *DeviceAuthorizationResponse) UnmarshalJSON(data []byte) error {
+	type Alias DeviceAuthorizationResponse
+	aux := &struct {
+		// workaround misspelling of verification_uri
+		// https://stackoverflow.com/q/76696956/5690223
+		// https://developers.google.com/identity/protocols/oauth2/limited-input-device?hl=fr#success-response
+		VerificationURL string `json:"verification_url"`
+		*Alias
+	}{
+		Alias: (*Alias)(resp),
+	}
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+	if resp.VerificationURI == "" {
+		resp.VerificationURI = aux.VerificationURL
+	}
+	return nil
+}
+
 // DeviceAccessTokenRequest implements
 // https://www.rfc-editor.org/rfc/rfc8628#section-3.4,
 // Device Access Token Request.

pkg/oidc/device_authorization_test.go

@@ -0,0 +1,30 @@
+package oidc
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDeviceAuthorizationResponse_UnmarshalJSON(t *testing.T) {
+	jsonStr := `{
+		"device_code": "deviceCode",
+		"user_code": "userCode",
+		"verification_url": "http://example.com/verify",
+		"expires_in": 3600,
+		"interval": 5
+	}`
+
+	expected := &DeviceAuthorizationResponse{
+		DeviceCode:      "deviceCode",
+		UserCode:        "userCode",
+		VerificationURI: "http://example.com/verify",
+		ExpiresIn:       3600,
+		Interval:        5,
+	}
+
+	var resp DeviceAuthorizationResponse
+	err := resp.UnmarshalJSON([]byte(jsonStr))
+	assert.NoError(t, err)
+	assert.Equal(t, expected, &resp)
+}

pkg/oidc/discovery.go

@@ -145,6 +145,14 @@ type DiscoveryConfiguration struct {
 
 	// OPTermsOfServiceURI is a URL the OpenID Provider provides to the person registering the Client to read about OpenID Provider's terms of service.
 	OPTermsOfServiceURI string `json:"op_tos_uri,omitempty"`
+
+	// BackChannelLogoutSupported specifies whether the OP supports back-channel logout (https://openid.net/specs/openid-connect-backchannel-1_0.html),
+	// with true indicating support. If omitted, the default value is false.
+	BackChannelLogoutSupported bool `json:"backchannel_logout_supported,omitempty"`
+
+	// BackChannelLogoutSessionSupported specifies whether the OP can pass a sid (session ID) Claim in the Logout Token to identify the RP session with the OP.
+	// If supported, the sid Claim is also included in ID Tokens issued by the OP. If omitted, the default value is false.
+	BackChannelLogoutSessionSupported bool `json:"backchannel_logout_session_supported,omitempty"`
 }
 
 type AuthMethod string

pkg/oidc/error.go

@@ -1,10 +1,10 @@
 package oidc
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
-
+	"log/slog"
-	"golang.org/x/exp/slog"
 )
 
 type errorType string
@@ -28,6 +28,11 @@ const (
 	SlowDown             errorType = "slow_down"
 	AccessDenied         errorType = "access_denied"
 	ExpiredToken         errorType = "expired_token"
+
+	// InvalidTarget error is returned by Token Exchange if
+	// the requested target or audience is invalid.
+	// [RFC 8693, Section 2.2.2: Error Response](https://www.rfc-editor.org/rfc/rfc8693#section-2.2.2)
+	InvalidTarget errorType = "invalid_target"
 )
 
 var (
@@ -113,6 +118,14 @@ var (
 			Description: "The \"device_code\" has expired.",
 		}
 	}
+
+	// Token exchange error
+	ErrInvalidTarget = func() *Error {
+		return &Error{
+			ErrorType:   InvalidTarget,
+			Description: "The requested audience or target is invalid.",
+		}
+	}
 )
 
 type Error struct {
@@ -120,7 +133,28 @@ type Error struct {
 	ErrorType        errorType `json:"error" schema:"error"`
 	Description      string    `json:"error_description,omitempty" schema:"error_description,omitempty"`
 	State            string    `json:"state,omitempty" schema:"state,omitempty"`
+	SessionState     string    `json:"session_state,omitempty" schema:"session_state,omitempty"`
 	redirectDisabled bool      `schema:"-"`
+	returnParent     bool      `schema:"-"`
+}
+
+func (e *Error) MarshalJSON() ([]byte, error) {
+	m := struct {
+		Error            errorType `json:"error"`
+		ErrorDescription string    `json:"error_description,omitempty"`
+		State            string    `json:"state,omitempty"`
+		SessionState     string    `json:"session_state,omitempty"`
+		Parent           string    `json:"parent,omitempty"`
+	}{
+		Error:            e.ErrorType,
+		ErrorDescription: e.Description,
+		State:            e.State,
+		SessionState:     e.SessionState,
+	}
+	if e.returnParent {
+		m.Parent = e.Parent.Error()
+	}
+	return json.Marshal(m)
 }
 
 func (e *Error) Error() string {
@@ -145,7 +179,8 @@ func (e *Error) Is(target error) bool {
 	}
 	return e.ErrorType == t.ErrorType &&
 		(e.Description == t.Description || t.Description == "") &&
-		(e.State == t.State || t.State == "")
+		(e.State == t.State || t.State == "") &&
+		(e.SessionState == t.SessionState || t.SessionState == "")
 }
 
 func (e *Error) WithParent(err error) *Error {
@@ -153,6 +188,18 @@ func (e *Error) WithParent(err error) *Error {
 	return e
 }
 
+// WithReturnParentToClient allows returning the set parent error to the HTTP client.
+// Currently it only supports setting the parent inside JSON responses, not redirect URLs.
+// As Go errors don't unmarshal well, only the marshaller is implemented for the moment.
+//
+// Warning: parent errors may contain sensitive data or unwanted details about the server status.
+// Also, the `parent` field is not a standard error field and might confuse certain clients
+// that require fully compliant responses.
+func (e *Error) WithReturnParentToClient(b bool) *Error {
+	e.returnParent = b
+	return e
+}
+
 func (e *Error) WithDescription(desc string, args ...any) *Error {
 	e.Description = fmt.Sprintf(desc, args...)
 	return e
@@ -199,6 +246,9 @@ func (e *Error) LogValue() slog.Value {
 	if e.State != "" {
 		attrs = append(attrs, slog.String("state", e.State))
 	}
+	if e.SessionState != "" {
+		attrs = append(attrs, slog.String("session_state", e.SessionState))
+	}
 	if e.redirectDisabled {
 		attrs = append(attrs, slog.Bool("redirect_disabled", e.redirectDisabled))
 	}

pkg/oidc/error_go120_test.go

@@ -1,83 +0,0 @@
-//go:build go1.20
-
-package oidc
-
-import (
-	"io"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"golang.org/x/exp/slog"
-)
-
-func TestError_LogValue(t *testing.T) {
-	type fields struct {
-		Parent           error
-		ErrorType        errorType
-		Description      string
-		State            string
-		redirectDisabled bool
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   slog.Value
-	}{
-		{
-			name: "parent",
-			fields: fields{
-				Parent: io.EOF,
-			},
-			want: slog.GroupValue(slog.Any("parent", io.EOF)),
-		},
-		{
-			name: "description",
-			fields: fields{
-				Description: "oops",
-			},
-			want: slog.GroupValue(slog.String("description", "oops")),
-		},
-		{
-			name: "errorType",
-			fields: fields{
-				ErrorType: ExpiredToken,
-			},
-			want: slog.GroupValue(slog.String("type", string(ExpiredToken))),
-		},
-		{
-			name: "state",
-			fields: fields{
-				State: "123",
-			},
-			want: slog.GroupValue(slog.String("state", "123")),
-		},
-		{
-			name: "all fields",
-			fields: fields{
-				Parent:      io.EOF,
-				Description: "oops",
-				ErrorType:   ExpiredToken,
-				State:       "123",
-			},
-			want: slog.GroupValue(
-				slog.Any("parent", io.EOF),
-				slog.String("description", "oops"),
-				slog.String("type", string(ExpiredToken)),
-				slog.String("state", "123"),
-			),
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			e := &Error{
-				Parent:           tt.fields.Parent,
-				ErrorType:        tt.fields.ErrorType,
-				Description:      tt.fields.Description,
-				State:            tt.fields.State,
-				redirectDisabled: tt.fields.redirectDisabled,
-			}
-			got := e.LogValue()
-			assert.Equal(t, tt.want, got)
-		})
-	}
-}

pkg/oidc/error_test.go

@@ -1,11 +1,14 @@
 package oidc
 
 import (
+	"encoding/json"
+	"errors"
 	"io"
+	"log/slog"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"golang.org/x/exp/slog"
+	"github.com/stretchr/testify/require"
 )
 
 func TestDefaultToServerError(t *testing.T) {
@@ -79,3 +82,111 @@ func TestError_LogLevel(t *testing.T) {
 		})
 	}
 }
+
+func TestError_LogValue(t *testing.T) {
+	type fields struct {
+		Parent           error
+		ErrorType        errorType
+		Description      string
+		State            string
+		redirectDisabled bool
+	}
+	tests := []struct {
+		name   string
+		fields fields
+		want   slog.Value
+	}{
+		{
+			name: "parent",
+			fields: fields{
+				Parent: io.EOF,
+			},
+			want: slog.GroupValue(slog.Any("parent", io.EOF)),
+		},
+		{
+			name: "description",
+			fields: fields{
+				Description: "oops",
+			},
+			want: slog.GroupValue(slog.String("description", "oops")),
+		},
+		{
+			name: "errorType",
+			fields: fields{
+				ErrorType: ExpiredToken,
+			},
+			want: slog.GroupValue(slog.String("type", string(ExpiredToken))),
+		},
+		{
+			name: "state",
+			fields: fields{
+				State: "123",
+			},
+			want: slog.GroupValue(slog.String("state", "123")),
+		},
+		{
+			name: "all fields",
+			fields: fields{
+				Parent:      io.EOF,
+				Description: "oops",
+				ErrorType:   ExpiredToken,
+				State:       "123",
+			},
+			want: slog.GroupValue(
+				slog.Any("parent", io.EOF),
+				slog.String("description", "oops"),
+				slog.String("type", string(ExpiredToken)),
+				slog.String("state", "123"),
+			),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			e := &Error{
+				Parent:           tt.fields.Parent,
+				ErrorType:        tt.fields.ErrorType,
+				Description:      tt.fields.Description,
+				State:            tt.fields.State,
+				redirectDisabled: tt.fields.redirectDisabled,
+			}
+			got := e.LogValue()
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func TestError_MarshalJSON(t *testing.T) {
+	tests := []struct {
+		name string
+		e    *Error
+		want string
+	}{
+		{
+			name: "simple error",
+			e:    ErrAccessDenied(),
+			want: `{"error":"access_denied","error_description":"The authorization request was denied."}`,
+		},
+		{
+			name: "with description",
+			e:    ErrAccessDenied().WithDescription("oops"),
+			want: `{"error":"access_denied","error_description":"oops"}`,
+		},
+		{
+			name: "with parent",
+			e:    ErrServerError().WithParent(errors.New("oops")),
+			want: `{"error":"server_error"}`,
+		},
+		{
+			name: "with return parent",
+			e:    ErrServerError().WithParent(errors.New("oops")).WithReturnParentToClient(true),
+			want: `{"error":"server_error","parent":"oops"}`,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := json.Marshal(tt.e)
+			require.NoError(t, err)
+			assert.JSONEq(t, tt.want, string(got))
+		})
+	}
+}

pkg/oidc/introspection.go

@@ -16,18 +16,21 @@ type ClientAssertionParams struct {
 // https://www.rfc-editor.org/rfc/rfc7662.html#section-2.2.
 // https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims.
 type IntrospectionResponse struct {
-	Active     bool                `json:"active"`
+	Active                          bool                `json:"active"`
-	Scope      SpaceDelimitedArray `json:"scope,omitempty"`
+	Scope                           SpaceDelimitedArray `json:"scope,omitempty"`
-	ClientID   string              `json:"client_id,omitempty"`
+	ClientID                        string              `json:"client_id,omitempty"`
-	TokenType  string              `json:"token_type,omitempty"`
+	TokenType                       string              `json:"token_type,omitempty"`
-	Expiration Time                `json:"exp,omitempty"`
+	Expiration                      Time                `json:"exp,omitempty"`
-	IssuedAt   Time                `json:"iat,omitempty"`
+	IssuedAt                        Time                `json:"iat,omitempty"`
-	NotBefore  Time                `json:"nbf,omitempty"`
+	AuthTime                        Time                `json:"auth_time,omitempty"`
-	Subject    string              `json:"sub,omitempty"`
+	NotBefore                       Time                `json:"nbf,omitempty"`
-	Audience   Audience            `json:"aud,omitempty"`
+	Subject                         string              `json:"sub,omitempty"`
-	Issuer     string              `json:"iss,omitempty"`
+	Audience                        Audience            `json:"aud,omitempty"`
-	JWTID      string              `json:"jti,omitempty"`
+	AuthenticationMethodsReferences []string            `json:"amr,omitempty"`
-	Username   string              `json:"username,omitempty"`
+	Issuer                          string              `json:"iss,omitempty"`
+	JWTID                           string              `json:"jti,omitempty"`
+	Username                        string              `json:"username,omitempty"`
+	Actor                           *ActorClaims        `json:"act,omitempty"`
 	UserInfoProfile
 	UserInfoEmail
 	UserInfoPhone

pkg/oidc/keyset.go

@@ -6,8 +6,9 @@ import (
 	"crypto/ed25519"
 	"crypto/rsa"
 	"errors"
+	"strings"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 )
 
 const (
@@ -92,17 +93,17 @@ func FindMatchingKey(keyID, use, expectedAlg string, keys ...jose.JSONWebKey) (k
 }
 
 func algToKeyType(key any, alg string) bool {
-	switch alg[0] {
+	if strings.HasPrefix(alg, "RS") || strings.HasPrefix(alg, "PS") {
-	case 'R', 'P':
 		_, ok := key.(*rsa.PublicKey)
 		return ok
-	case 'E':
+	}
+	if strings.HasPrefix(alg, "ES") {
 		_, ok := key.(*ecdsa.PublicKey)
 		return ok
-	case 'O':
-		_, ok := key.(*ed25519.PublicKey)
-		return ok
-	default:
-		return false
 	}
+	if alg == string(jose.EdDSA) {
+		_, ok := key.(ed25519.PublicKey)
+		return ok
+	}
+	return false
 }

pkg/oidc/keyset_test.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"testing"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 )
 
 func TestFindKey(t *testing.T) {

pkg/oidc/session.go

@@ -1,10 +1,12 @@
 package oidc
 
 // EndSessionRequest for the RP-Initiated Logout according to:
-//https://openid.net/specs/openid-connect-rpinitiated-1_0.html#RPLogout
+// https://openid.net/specs/openid-connect-rpinitiated-1_0.html#RPLogout
 type EndSessionRequest struct {
-	IdTokenHint           string `schema:"id_token_hint"`
+	IdTokenHint           string  `schema:"id_token_hint"`
-	ClientID              string `schema:"client_id"`
+	LogoutHint            string  `schema:"logout_hint"`
-	PostLogoutRedirectURI string `schema:"post_logout_redirect_uri"`
+	ClientID              string  `schema:"client_id"`
-	State                 string `schema:"state"`
+	PostLogoutRedirectURI string  `schema:"post_logout_redirect_uri"`
+	State                 string  `schema:"state"`
+	UILocales             Locales `schema:"ui_locales"`
 }

pkg/oidc/token.go

@@ -5,11 +5,12 @@ import (
 	"os"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"golang.org/x/oauth2"
 
 	"github.com/muhlemmer/gu"
-	"github.com/zitadel/oidc/v3/pkg/crypto"
+
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/crypto"
 )
 
 const (
@@ -34,19 +35,20 @@ type Tokens[C IDClaims] struct {
 // TokenClaims implements the Claims interface,
 // and can be used to extend larger claim types by embedding.
 type TokenClaims struct {
-	Issuer                              string   `json:"iss,omitempty"`
+	Issuer                              string       `json:"iss,omitempty"`
-	Subject                             string   `json:"sub,omitempty"`
+	Subject                             string       `json:"sub,omitempty"`
-	Audience                            Audience `json:"aud,omitempty"`
+	Audience                            Audience     `json:"aud,omitempty"`
-	Expiration                          Time     `json:"exp,omitempty"`
+	Expiration                          Time         `json:"exp,omitempty"`
-	IssuedAt                            Time     `json:"iat,omitempty"`
+	IssuedAt                            Time         `json:"iat,omitempty"`
-	AuthTime                            Time     `json:"auth_time,omitempty"`
+	AuthTime                            Time         `json:"auth_time,omitempty"`
-	NotBefore                           Time     `json:"nbf,omitempty"`
+	NotBefore                           Time         `json:"nbf,omitempty"`
-	Nonce                               string   `json:"nonce,omitempty"`
+	Nonce                               string       `json:"nonce,omitempty"`
-	AuthenticationContextClassReference string   `json:"acr,omitempty"`
+	AuthenticationContextClassReference string       `json:"acr,omitempty"`
-	AuthenticationMethodsReferences     []string `json:"amr,omitempty"`
+	AuthenticationMethodsReferences     []string     `json:"amr,omitempty"`
-	AuthorizedParty                     string   `json:"azp,omitempty"`
+	AuthorizedParty                     string       `json:"azp,omitempty"`
-	ClientID                            string   `json:"client_id,omitempty"`
+	ClientID                            string       `json:"client_id,omitempty"`
-	JWTID                               string   `json:"jti,omitempty"`
+	JWTID                               string       `json:"jti,omitempty"`
+	Actor                               *ActorClaims `json:"act,omitempty"`
 
 	// Additional information set by this framework
 	SignatureAlg jose.SignatureAlgorithm `json:"-"`
@@ -115,6 +117,7 @@ func NewAccessTokenClaims(issuer, subject string, audience []string, expiration
 			Expiration: FromTime(expiration),
 			IssuedAt:   FromTime(now),
 			NotBefore:  FromTime(now),
+			ClientID:   clientID,
 			JWTID:      jwtid,
 		},
 	}
@@ -204,13 +207,36 @@ func (i *IDTokenClaims) UnmarshalJSON(data []byte) error {
 	return unmarshalJSONMulti(data, (*itcAlias)(i), &i.Claims)
 }
 
+// ActorClaims provides the `act` claims used for impersonation or delegation Token Exchange.
+//
+// An actor can be nested in case an obtained token is used as actor token to obtain impersonation or delegation.
+// This allows creating a chain of actors.
+// See [RFC 8693, section 4.1](https://www.rfc-editor.org/rfc/rfc8693#name-act-actor-claim).
+type ActorClaims struct {
+	Actor   *ActorClaims   `json:"act,omitempty"`
+	Issuer  string         `json:"iss,omitempty"`
+	Subject string         `json:"sub,omitempty"`
+	Claims  map[string]any `json:"-"`
+}
+
+type acAlias ActorClaims
+
+func (c *ActorClaims) MarshalJSON() ([]byte, error) {
+	return mergeAndMarshalClaims((*acAlias)(c), c.Claims)
+}
+
+func (c *ActorClaims) UnmarshalJSON(data []byte) error {
+	return unmarshalJSONMulti(data, (*acAlias)(c), &c.Claims)
+}
+
 type AccessTokenResponse struct {
-	AccessToken  string `json:"access_token,omitempty" schema:"access_token,omitempty"`
+	AccessToken  string              `json:"access_token,omitempty" schema:"access_token,omitempty"`
-	TokenType    string `json:"token_type,omitempty" schema:"token_type,omitempty"`
+	TokenType    string              `json:"token_type,omitempty" schema:"token_type,omitempty"`
-	RefreshToken string `json:"refresh_token,omitempty" schema:"refresh_token,omitempty"`
+	RefreshToken string              `json:"refresh_token,omitempty" schema:"refresh_token,omitempty"`
-	ExpiresIn    uint64 `json:"expires_in,omitempty" schema:"expires_in,omitempty"`
+	ExpiresIn    uint64              `json:"expires_in,omitempty" schema:"expires_in,omitempty"`
-	IDToken      string `json:"id_token,omitempty" schema:"id_token,omitempty"`
+	IDToken      string              `json:"id_token,omitempty" schema:"id_token,omitempty"`
-	State        string `json:"state,omitempty" schema:"state,omitempty"`
+	State        string              `json:"state,omitempty" schema:"state,omitempty"`
+	Scope        SpaceDelimitedArray `json:"scope,omitempty" schema:"scope,omitempty"`
 }
 
 type JWTProfileAssertionClaims struct {
@@ -321,12 +347,12 @@ func AppendClientIDToAudience(clientID string, audience []string) []string {
 }
 
 func GenerateJWTProfileToken(assertion *JWTProfileAssertionClaims) (string, error) {
-	privateKey, err := crypto.BytesToPrivateKey(assertion.PrivateKey)
+	privateKey, algorithm, err := crypto.BytesToPrivateKey(assertion.PrivateKey)
 	if err != nil {
 		return "", err
 	}
 	key := jose.SigningKey{
-		Algorithm: jose.RS256,
+		Algorithm: algorithm,
 		Key:       &jose.JSONWebKey{Key: privateKey, KeyID: assertion.PrivateKeyID},
 	}
 	signer, err := jose.NewSigner(key, &jose.SignerOptions{})
@@ -352,4 +378,45 @@ type TokenExchangeResponse struct {
 	ExpiresIn       uint64              `json:"expires_in,omitempty"`
 	Scopes          SpaceDelimitedArray `json:"scope,omitempty"`
 	RefreshToken    string              `json:"refresh_token,omitempty"`
+
+	// IDToken field allows returning an additional ID token
+	// if the requested_token_type was Access Token and scope contained openid.
+	IDToken string `json:"id_token,omitempty"`
+}
+
+type LogoutTokenClaims struct {
+	Issuer     string         `json:"iss,omitempty"`
+	Subject    string         `json:"sub,omitempty"`
+	Audience   Audience       `json:"aud,omitempty"`
+	IssuedAt   Time           `json:"iat,omitempty"`
+	Expiration Time           `json:"exp,omitempty"`
+	JWTID      string         `json:"jti,omitempty"`
+	Events     map[string]any `json:"events,omitempty"`
+	SessionID  string         `json:"sid,omitempty"`
+	Claims     map[string]any `json:"-"`
+}
+
+type ltcAlias LogoutTokenClaims
+
+func (i *LogoutTokenClaims) MarshalJSON() ([]byte, error) {
+	return mergeAndMarshalClaims((*ltcAlias)(i), i.Claims)
+}
+
+func (i *LogoutTokenClaims) UnmarshalJSON(data []byte) error {
+	return unmarshalJSONMulti(data, (*ltcAlias)(i), &i.Claims)
+}
+
+func NewLogoutTokenClaims(issuer, subject string, audience Audience, expiration time.Time, jwtID, sessionID string, skew time.Duration) *LogoutTokenClaims {
+	return &LogoutTokenClaims{
+		Issuer:     issuer,
+		Subject:    subject,
+		Audience:   audience,
+		IssuedAt:   FromTime(time.Now().Add(-skew)),
+		Expiration: FromTime(expiration),
+		JWTID:      jwtID,
+		Events: map[string]any{
+			"http://schemas.openid.net/event/backchannel-logout": struct{}{},
+		},
+		SessionID: sessionID,
+	}
 }

pkg/oidc/token_request.go

@@ -3,9 +3,10 @@ package oidc
 import (
 	"encoding/json"
 	"fmt"
+	"slices"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 )
 
 const (
@@ -57,13 +58,7 @@ var AllTokenTypes = []TokenType{
 type TokenType string
 
 func (t TokenType) IsSupported() bool {
-	for _, tt := range AllTokenTypes {
+	return slices.Contains(AllTokenTypes, t)
-		if t == tt {
-			return true
-		}
-	}
-
-	return false
 }
 
 type TokenRequest interface {
@@ -77,10 +72,10 @@ type AccessTokenRequest struct {
 	Code                string `schema:"code"`
 	RedirectURI         string `schema:"redirect_uri"`
 	ClientID            string `schema:"client_id"`
-	ClientSecret        string `schema:"client_secret"`
+	ClientSecret        string `schema:"client_secret,omitempty"`
-	CodeVerifier        string `schema:"code_verifier"`
+	CodeVerifier        string `schema:"code_verifier,omitempty"`
-	ClientAssertion     string `schema:"client_assertion"`
+	ClientAssertion     string `schema:"client_assertion,omitempty"`
-	ClientAssertionType string `schema:"client_assertion_type"`
+	ClientAssertionType string `schema:"client_assertion_type,omitempty"`
 }
 
 func (a *AccessTokenRequest) GrantType() GrantType {

pkg/oidc/token_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/stretchr/testify/assert"
 	"golang.org/x/text/language"
 )
@@ -145,6 +145,7 @@ func TestNewAccessTokenClaims(t *testing.T) {
 			Subject:    "hello@me.com",
 			Audience:   Audience{"foo"},
 			Expiration: 12345,
+			ClientID:   "foo",
 			JWTID:      "900",
 		},
 	}
@@ -241,3 +242,39 @@ func TestIDTokenClaims_GetUserInfo(t *testing.T) {
 	got := idTokenData.GetUserInfo()
 	assert.Equal(t, want, got)
 }
+
+func TestNewLogoutTokenClaims(t *testing.T) {
+	want := &LogoutTokenClaims{
+		Issuer:     "zitadel",
+		Subject:    "hello@me.com",
+		Audience:   Audience{"foo", "just@me.com"},
+		Expiration: 12345,
+		JWTID:      "jwtID",
+		Events: map[string]any{
+			"http://schemas.openid.net/event/backchannel-logout": struct{}{},
+		},
+		SessionID: "sessionID",
+		Claims:    nil,
+	}
+
+	got := NewLogoutTokenClaims(
+		want.Issuer,
+		want.Subject,
+		want.Audience,
+		want.Expiration.AsTime(),
+		want.JWTID,
+		want.SessionID,
+		1*time.Second,
+	)
+
+	// test if the dynamic timestamp is around now,
+	// allowing for a delta of 1, just in case we flip on
+	// either side of a second boundry.
+	nowMinusSkew := NowTime() - 1
+	assert.InDelta(t, int64(nowMinusSkew), int64(got.IssuedAt), 1)
+
+	// Make equal not fail on dynamic timestamp
+	got.IssuedAt = 0
+
+	assert.Equal(t, want, got)
+}

pkg/oidc/types.go

@@ -3,12 +3,13 @@ package oidc
 import (
 	"database/sql/driver"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"reflect"
 	"strings"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/muhlemmer/gu"
 	"github.com/zitadel/schema"
 	"golang.org/x/text/language"
@@ -34,6 +35,17 @@ func (a *Audience) UnmarshalJSON(text []byte) error {
 	return nil
 }
 
+func (a *Audience) MarshalJSON() ([]byte, error) {
+	len := len(*a)
+	if len > 1 {
+		return json.Marshal(*a)
+	} else if len == 1 {
+		return json.Marshal((*a)[0])
+	}
+
+	return nil, errors.New("aud is empty")
+}
+
 type Display string
 
 func (d *Display) UnmarshalText(text []byte) error {
@@ -76,8 +88,26 @@ func (l *Locale) MarshalJSON() ([]byte, error) {
 	return json.Marshal(tag)
 }
 
+// UnmarshalJSON implements json.Unmarshaler.
+// When [language.ValueError] is encountered, the containing tag will be set
+// to an empty value (language "und") and no error will be returned.
+// This state can be checked with the `l.Tag().IsRoot()` method.
 func (l *Locale) UnmarshalJSON(data []byte) error {
-	return json.Unmarshal(data, &l.tag)
+	if len(data) == 0 || string(data) == "\"\"" {
+		return nil
+	}
+	err := json.Unmarshal(data, &l.tag)
+	if err == nil {
+		return nil
+	}
+
+	// catch "well-formed but unknown" errors
+	var target language.ValueError
+	if errors.As(err, &target) {
+		l.tag = language.Tag{}
+		return nil
+	}
+	return err
 }
 
 type Locales []language.Tag
@@ -96,6 +126,14 @@ func ParseLocales(locales []string) Locales {
 	return out
 }
 
+func (l Locales) String() string {
+	tags := make([]string, len(l))
+	for i, tag := range l {
+		tags[i] = tag.String()
+	}
+	return strings.Join(tags, " ")
+}
+
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
 // It decodes an unquoted space seperated string into Locales.
 // Undefined language tags in the input are ignored and ommited from
@@ -212,6 +250,9 @@ func NewEncoder() *schema.Encoder {
 	e.RegisterEncoder(SpaceDelimitedArray{}, func(value reflect.Value) string {
 		return value.Interface().(SpaceDelimitedArray).String()
 	})
+	e.RegisterEncoder(Locales{}, func(value reflect.Value) string {
+		return value.Interface().(Locales).String()
+	})
 	return e
 }
 

pkg/oidc/types_test.go

@@ -208,20 +208,71 @@ func TestLocale_MarshalJSON(t *testing.T) {
 }
 
 func TestLocale_UnmarshalJSON(t *testing.T) {
-	type a struct {
+	type dst struct {
 		Locale *Locale `json:"locale,omitempty"`
 	}
-	want := a{
+	tests := []struct {
-		Locale: NewLocale(language.Afrikaans),
+		name    string
+		input   string
+		want    dst
+		wantErr bool
+	}{
+		{
+			name:    "value not present",
+			input:   `{}`,
+			wantErr: false,
+			want: dst{
+				Locale: nil,
+			},
+		},
+		{
+			name:    "null",
+			input:   `{"locale": null}`,
+			wantErr: false,
+			want: dst{
+				Locale: nil,
+			},
+		},
+		{
+			name:    "empty, ignored",
+			input:   `{"locale": ""}`,
+			wantErr: false,
+			want: dst{
+				Locale: &Locale{},
+			},
+		},
+		{
+			name:  "afrikaans, ok",
+			input: `{"locale": "af"}`,
+			want: dst{
+				Locale: NewLocale(language.Afrikaans),
+			},
+		},
+		{
+			name:  "gb, ignored",
+			input: `{"locale": "gb"}`,
+			want: dst{
+				Locale: &Locale{},
+			},
+		},
+		{
+			name:    "bad form, error",
+			input:   `{"locale": "g!!!!!"}`,
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var got dst
+			err := json.Unmarshal([]byte(tt.input), &got)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, got)
+		})
 	}
-
-	const input = `{"locale": "af"}`
-	var got a
-
-	require.NoError(t,
-		json.Unmarshal([]byte(input), &got),
-	)
-	assert.Equal(t, want, got)
 }
 
 func TestParseLocales(t *testing.T) {

pkg/oidc/verifier.go

@@ -7,12 +7,11 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"slices"
 	"strings"
 	"time"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
-
-	str "github.com/zitadel/oidc/v3/pkg/strings"
 )
 
 type Claims interface {
@@ -41,6 +40,7 @@ type IDClaims interface {
 var (
 	ErrParse                   = errors.New("parsing of request failed")
 	ErrIssuerInvalid           = errors.New("issuer does not match")
+	ErrDiscoveryFailed         = errors.New("OpenID Provider Configuration Discovery has failed")
 	ErrSubjectMissing          = errors.New("subject missing")
 	ErrAudience                = errors.New("audience is not valid")
 	ErrAzpMissing              = errors.New("authorized party is not set. If Token is valid for multiple audiences, azp must not be empty")
@@ -57,7 +57,7 @@ var (
 	ErrNonceInvalid            = errors.New("nonce does not match")
 	ErrAcrInvalid              = errors.New("acr is invalid")
 	ErrAuthTimeNotPresent      = errors.New("claim `auth_time` of token is missing")
-	ErrAuthTimeToOld           = errors.New("auth time of token is to old")
+	ErrAuthTimeToOld           = errors.New("auth time of token is too old")
 	ErrAtHash                  = errors.New("at_hash does not correspond to access token")
 )
 
@@ -83,7 +83,7 @@ type ACRVerifier func(string) error
 // if none of the provided values matches the acr claim
 func DefaultACRVerifier(possibleValues []string) ACRVerifier {
 	return func(acr string) error {
-		if !str.Contains(possibleValues, acr) {
+		if !slices.Contains(possibleValues, acr) {
 			return fmt.Errorf("expected one of: %v, got: %q", possibleValues, acr)
 		}
 		return nil
@@ -122,7 +122,7 @@ func CheckIssuer(claims Claims, issuer string) error {
 }
 
 func CheckAudience(claims Claims, clientID string) error {
-	if !str.Contains(claims.GetAudience(), clientID) {
+	if !slices.Contains(claims.GetAudience(), clientID) {
 		return fmt.Errorf("%w: Audience must contain client_id %q", ErrAudience, clientID)
 	}
 
@@ -148,8 +148,13 @@ func CheckAuthorizedParty(claims Claims, clientID string) error {
 }
 
 func CheckSignature(ctx context.Context, token string, payload []byte, claims ClaimsSignature, supportedSigAlgs []string, set KeySet) error {
-	jws, err := jose.ParseSigned(token)
+	jws, err := jose.ParseSigned(token, toJoseSignatureAlgorithms(supportedSigAlgs))
 	if err != nil {
+		if strings.HasPrefix(err.Error(), "go-jose/go-jose: unexpected signature algorithm") {
+			// TODO(v4): we should wrap errors instead of returning static ones.
+			// This is a workaround so we keep returning the same error for now.
+			return ErrSignatureUnsupportedAlg
+		}
 		return ErrParse
 	}
 	if len(jws.Signatures) == 0 {
@@ -159,12 +164,6 @@ func CheckSignature(ctx context.Context, token string, payload []byte, claims Cl
 		return ErrSignatureMultiple
 	}
 	sig := jws.Signatures[0]
-	if len(supportedSigAlgs) == 0 {
-		supportedSigAlgs = []string{"RS256"}
-	}
-	if !str.Contains(supportedSigAlgs, sig.Header.Algorithm) {
-		return fmt.Errorf("%w: id token signed with unsupported algorithm, expected %q got %q", ErrSignatureUnsupportedAlg, supportedSigAlgs, sig.Header.Algorithm)
-	}
 
 	signedPayload, err := set.VerifySignature(ctx, jws)
 	if err != nil {
@@ -180,6 +179,18 @@ func CheckSignature(ctx context.Context, token string, payload []byte, claims Cl
 	return nil
 }
 
+// TODO(v4): Use the new jose.SignatureAlgorithm type directly, instead of string.
+func toJoseSignatureAlgorithms(algorithms []string) []jose.SignatureAlgorithm {
+	out := make([]jose.SignatureAlgorithm, len(algorithms))
+	for i := range algorithms {
+		out[i] = jose.SignatureAlgorithm(algorithms[i])
+	}
+	if len(out) == 0 {
+		out = append(out, jose.RS256, jose.ES256, jose.PS256)
+	}
+	return out
+}
+
 func CheckExpiration(claims Claims, offset time.Duration) error {
 	expiration := claims.GetExpiration()
 	if !time.Now().Add(offset).Before(expiration) {

pkg/oidc/verifier_parse_test.go

@@ -5,10 +5,10 @@ import (
 	"encoding/json"
 	"testing"
 
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
 
 func TestParseToken(t *testing.T) {

pkg/op/auth_request.go

@@ -1,20 +1,23 @@
 package op
 
 import (
+	"bytes"
 	"context"
+	_ "embed"
 	"errors"
 	"fmt"
+	"html/template"
+	"log/slog"
 	"net"
 	"net/http"
 	"net/url"
-	"path"
+	"slices"
 	"strings"
 	"time"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	str "github.com/zitadel/oidc/v3/pkg/strings"
+	"github.com/bmatcuk/doublestar/v4"
-	"golang.org/x/exp/slog"
 )
 
 type AuthRequest interface {
@@ -35,6 +38,13 @@ type AuthRequest interface {
 	Done() bool
 }
 
+// AuthRequestSessionState should be implemented if [OpenID Connect Session Management](https://openid.net/specs/openid-connect-session-1_0.html) is supported
+type AuthRequestSessionState interface {
+	// GetSessionState returns session_state.
+	// session_state is related to OpenID Connect Session Management.
+	GetSessionState() string
+}
+
 type Authorizer interface {
 	Storage() Storage
 	Decoder() httphelper.Decoder
@@ -52,13 +62,19 @@ type AuthorizeValidator interface {
 	ValidateAuthRequest(context.Context, *oidc.AuthRequest, Storage, *IDTokenHintVerifier) (string, error)
 }
 
+type CodeResponseType struct {
+	Code         string `schema:"code"`
+	State        string `schema:"state,omitempty"`
+	SessionState string `schema:"session_state,omitempty"`
+}
+
 func authorizeHandler(authorizer Authorizer) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		Authorize(w, r, authorizer)
 	}
 }
 
-func authorizeCallbackHandler(authorizer Authorizer) func(http.ResponseWriter, *http.Request) {
+func AuthorizeCallbackHandler(authorizer Authorizer) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		AuthorizeCallback(w, r, authorizer)
 	}
@@ -67,30 +83,41 @@ func authorizeCallbackHandler(authorizer Authorizer) func(http.ResponseWriter, *
 // Authorize handles the authorization request, including
 // parsing, validating, storing and finally redirecting to the login handler
 func Authorize(w http.ResponseWriter, r *http.Request, authorizer Authorizer) {
+	ctx, span := tracer.Start(r.Context(), "Authorize")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	authReq, err := ParseAuthorizeRequest(r, authorizer.Decoder())
 	if err != nil {
 		AuthRequestError(w, r, nil, err, authorizer)
 		return
 	}
-	ctx := r.Context()
 	if authReq.RequestParam != "" && authorizer.RequestObjectSupported() {
 		err = ParseRequestObject(ctx, authReq, authorizer.Storage(), IssuerFromContext(ctx))
 		if err != nil {
-			AuthRequestError(w, r, authReq, err, authorizer)
+			AuthRequestError(w, r, nil, err, authorizer)
 			return
 		}
 	}
 	if authReq.ClientID == "" {
-		AuthRequestError(w, r, authReq, fmt.Errorf("auth request is missing client_id"), authorizer)
+		AuthRequestError(w, r, nil, fmt.Errorf("auth request is missing client_id"), authorizer)
 		return
 	}
 	if authReq.RedirectURI == "" {
-		AuthRequestError(w, r, authReq, fmt.Errorf("auth request is missing redirect_uri"), authorizer)
+		AuthRequestError(w, r, nil, fmt.Errorf("auth request is missing redirect_uri"), authorizer)
 		return
 	}
-	validation := ValidateAuthRequest
+
-	if validater, ok := authorizer.(AuthorizeValidator); ok {
+	var client Client
-		validation = validater.ValidateAuthRequest
+	validation := func(ctx context.Context, authReq *oidc.AuthRequest, storage Storage, verifier *IDTokenHintVerifier) (sub string, err error) {
+		client, err = authorizer.Storage().GetClientByClientID(ctx, authReq.ClientID)
+		if err != nil {
+			return "", oidc.ErrInvalidRequestRedirectURI().WithDescription("unable to retrieve client by id").WithParent(err)
+		}
+		return ValidateAuthRequestClient(ctx, authReq, client, verifier)
+	}
+	if validator, ok := authorizer.(AuthorizeValidator); ok {
+		validation = validator.ValidateAuthRequest
 	}
 	userID, err := validation(ctx, authReq, authorizer.Storage(), authorizer.IDTokenHintVerifier(ctx))
 	if err != nil {
@@ -106,11 +133,6 @@ func Authorize(w http.ResponseWriter, r *http.Request, authorizer Authorizer) {
 		AuthRequestError(w, r, authReq, oidc.DefaultToServerError(err, "unable to save auth request"), authorizer)
 		return
 	}
-	client, err := authorizer.Storage().GetClientByClientID(ctx, req.GetClientID())
-	if err != nil {
-		AuthRequestError(w, r, req, oidc.DefaultToServerError(err, "unable to retrieve client by id"), authorizer)
-		return
-	}
 	RedirectToLogin(req.GetID(), client, w, r)
 }
 
@@ -138,20 +160,20 @@ func ParseRequestObject(ctx context.Context, authReq *oidc.AuthRequest, storage
 	}
 
 	if requestObject.ClientID != "" && requestObject.ClientID != authReq.ClientID {
-		return oidc.ErrInvalidRequest()
+		return oidc.ErrInvalidRequest().WithDescription("missing or wrong client id in request")
 	}
 	if requestObject.ResponseType != "" && requestObject.ResponseType != authReq.ResponseType {
-		return oidc.ErrInvalidRequest()
+		return oidc.ErrInvalidRequest().WithDescription("missing or wrong response type in request")
 	}
 	if requestObject.Issuer != requestObject.ClientID {
-		return oidc.ErrInvalidRequest()
+		return oidc.ErrInvalidRequest().WithDescription("missing or wrong issuer in request")
 	}
-	if !str.Contains(requestObject.Audience, issuer) {
+	if !slices.Contains(requestObject.Audience, issuer) {
-		return oidc.ErrInvalidRequest()
+		return oidc.ErrInvalidRequest().WithDescription("issuer missing in audience")
 	}
 	keySet := &jwtProfileKeySet{storage: storage, clientID: requestObject.Issuer}
 	if err = oidc.CheckSignature(ctx, authReq.RequestParam, payload, requestObject, nil, keySet); err != nil {
-		return err
+		return oidc.ErrInvalidRequest().WithParent(err).WithDescription(err.Error())
 	}
 	CopyRequestObjectToAuthRequest(authReq, requestObject)
 	return nil
@@ -160,7 +182,7 @@ func ParseRequestObject(ctx context.Context, authReq *oidc.AuthRequest, storage
 // CopyRequestObjectToAuthRequest overwrites present values from the Request Object into the auth request
 // and clears the `RequestParam` of the auth request
 func CopyRequestObjectToAuthRequest(authReq *oidc.AuthRequest, requestObject *oidc.RequestObject) {
-	if str.Contains(authReq.Scopes, oidc.ScopeOpenID) && len(requestObject.Scopes) > 0 {
+	if slices.Contains(authReq.Scopes, oidc.ScopeOpenID) && len(requestObject.Scopes) > 0 {
 		authReq.Scopes = requestObject.Scopes
 	}
 	if requestObject.RedirectURI != "" {
@@ -205,23 +227,37 @@ func CopyRequestObjectToAuthRequest(authReq *oidc.AuthRequest, requestObject *oi
 	authReq.RequestParam = ""
 }
 
-// ValidateAuthRequest validates the authorize parameters and returns the userID of the id_token_hint if passed
+// ValidateAuthRequest validates the authorize parameters and returns the userID of the id_token_hint if passed.
+//
+// Deprecated: Use [ValidateAuthRequestClient] to prevent querying for the Client twice.
 func ValidateAuthRequest(ctx context.Context, authReq *oidc.AuthRequest, storage Storage, verifier *IDTokenHintVerifier) (sub string, err error) {
+	ctx, span := tracer.Start(ctx, "ValidateAuthRequest")
+	defer span.End()
+
+	client, err := storage.GetClientByClientID(ctx, authReq.ClientID)
+	if err != nil {
+		return "", oidc.ErrInvalidRequestRedirectURI().WithDescription("unable to retrieve client by id").WithParent(err)
+	}
+	return ValidateAuthRequestClient(ctx, authReq, client, verifier)
+}
+
+// ValidateAuthRequestClient validates the Auth request against the passed client.
+// If id_token_hint is part of the request, the subject of the token is returned.
+func ValidateAuthRequestClient(ctx context.Context, authReq *oidc.AuthRequest, client Client, verifier *IDTokenHintVerifier) (sub string, err error) {
+	ctx, span := tracer.Start(ctx, "ValidateAuthRequestClient")
+	defer span.End()
+
+	if err := ValidateAuthReqRedirectURI(client, authReq.RedirectURI, authReq.ResponseType); err != nil {
+		return "", err
+	}
 	authReq.MaxAge, err = ValidateAuthReqPrompt(authReq.Prompt, authReq.MaxAge)
 	if err != nil {
 		return "", err
 	}
-	client, err := storage.GetClientByClientID(ctx, authReq.ClientID)
-	if err != nil {
-		return "", oidc.DefaultToServerError(err, "unable to retrieve client by id")
-	}
 	authReq.Scopes, err = ValidateAuthReqScopes(client, authReq.Scopes)
 	if err != nil {
 		return "", err
 	}
-	if err := ValidateAuthReqRedirectURI(client, authReq.RedirectURI, authReq.ResponseType); err != nil {
-		return "", err
-	}
 	if err := ValidateAuthReqResponseType(client, authReq.ResponseType); err != nil {
 		return "", err
 	}
@@ -241,49 +277,35 @@ func ValidateAuthReqPrompt(prompts []string, maxAge *uint) (_ *uint, err error)
 	return maxAge, nil
 }
 
-// ValidateAuthReqScopes validates the passed scopes
+// ValidateAuthReqScopes validates the passed scopes and deletes any unsupported scopes.
+// An error is returned if scopes is empty.
 func ValidateAuthReqScopes(client Client, scopes []string) ([]string, error) {
 	if len(scopes) == 0 {
 		return nil, oidc.ErrInvalidRequest().
 			WithDescription("The scope of your request is missing. Please ensure some scopes are requested. " +
 				"If you have any questions, you may contact the administrator of the application.")
 	}
-	openID := false
+	scopes = slices.DeleteFunc(scopes, func(scope string) bool {
-	for i := len(scopes) - 1; i >= 0; i-- {
+		return !(scope == oidc.ScopeOpenID ||
-		scope := scopes[i]
+			scope == oidc.ScopeProfile ||
-		if scope == oidc.ScopeOpenID {
-			openID = true
-			continue
-		}
-		if !(scope == oidc.ScopeProfile ||
 			scope == oidc.ScopeEmail ||
 			scope == oidc.ScopePhone ||
 			scope == oidc.ScopeAddress ||
 			scope == oidc.ScopeOfflineAccess) &&
-			!client.IsScopeAllowed(scope) {
+			!client.IsScopeAllowed(scope)
-			scopes[i] = scopes[len(scopes)-1]
+	})
-			scopes[len(scopes)-1] = ""
-			scopes = scopes[:len(scopes)-1]
-		}
-	}
-	if !openID {
-		return nil, oidc.ErrInvalidScope().WithDescription("The scope openid is missing in your request. " +
-			"Please ensure the scope openid is added to the request. " +
-			"If you have any questions, you may contact the administrator of the application.")
-	}
-
 	return scopes, nil
 }
 
 // checkURIAgainstRedirects just checks aginst the valid redirect URIs and ignores
 // other factors.
 func checkURIAgainstRedirects(client Client, uri string) error {
-	if str.Contains(client.RedirectURIs(), uri) {
+	if slices.Contains(client.RedirectURIs(), uri) {
 		return nil
 	}
 	if globClient, ok := client.(HasRedirectGlobs); ok {
 		for _, uriGlob := range globClient.RedirectURIGlobs() {
-			isMatch, err := path.Match(uriGlob, uri)
+			isMatch, err := doublestar.Match(uriGlob, uri)
 			if err != nil {
 				return oidc.ErrServerError().WithParent(err)
 			}
@@ -303,12 +325,12 @@ func ValidateAuthReqRedirectURI(client Client, uri string, responseType oidc.Res
 		return oidc.ErrInvalidRequestRedirectURI().WithDescription("The redirect_uri is missing in the request. " +
 			"Please ensure it is added to the request. If you have any questions, you may contact the administrator of the application.")
 	}
+	if client.ApplicationType() == ApplicationTypeNative {
+		return validateAuthReqRedirectURINative(client, uri)
+	}
 	if strings.HasPrefix(uri, "https://") {
 		return checkURIAgainstRedirects(client, uri)
 	}
-	if client.ApplicationType() == ApplicationTypeNative {
-		return validateAuthReqRedirectURINative(client, uri, responseType)
-	}
 	if err := checkURIAgainstRedirects(client, uri); err != nil {
 		return err
 	}
@@ -327,14 +349,17 @@ func ValidateAuthReqRedirectURI(client Client, uri string, responseType oidc.Res
 }
 
 // ValidateAuthReqRedirectURINative validates the passed redirect_uri and response_type to the registered uris and client type
-func validateAuthReqRedirectURINative(client Client, uri string, responseType oidc.ResponseType) error {
+func validateAuthReqRedirectURINative(client Client, uri string) error {
 	parsedURL, isLoopback := HTTPLoopbackOrLocalhost(uri)
-	isCustomSchema := !strings.HasPrefix(uri, "http://")
+	isCustomSchema := !(strings.HasPrefix(uri, "http://") || strings.HasPrefix(uri, "https://"))
 	if err := checkURIAgainstRedirects(client, uri); err == nil {
 		if client.DevMode() {
 			return nil
 		}
-		// The RedirectURIs are only valid for native clients when localhost or non-"http://"
+		if !isLoopback && strings.HasPrefix(uri, "https://") {
+			return nil
+		}
+		// The RedirectURIs are only valid for native clients when localhost or non-"http://" and "https://"
 		if isLoopback || isCustomSchema {
 			return nil
 		}
@@ -359,16 +384,16 @@ func equalURI(url1, url2 *url.URL) bool {
 	return url1.Path == url2.Path && url1.RawQuery == url2.RawQuery
 }
 
-func HTTPLoopbackOrLocalhost(rawurl string) (*url.URL, bool) {
+func HTTPLoopbackOrLocalhost(rawURL string) (*url.URL, bool) {
-	parsedURL, err := url.Parse(rawurl)
+	parsedURL, err := url.Parse(rawURL)
 	if err != nil {
 		return nil, false
 	}
-	if parsedURL.Scheme != "http" {
+	if parsedURL.Scheme == "http" || parsedURL.Scheme == "https" {
-		return nil, false
+		hostName := parsedURL.Hostname()
+		return parsedURL, hostName == "localhost" || net.ParseIP(hostName).IsLoopback()
 	}
-	hostName := parsedURL.Hostname()
+	return nil, false
-	return parsedURL, hostName == "localhost" || net.ParseIP(hostName).IsLoopback()
 }
 
 // ValidateAuthReqResponseType validates the passed response_type to the registered response types
@@ -391,9 +416,9 @@ func ValidateAuthReqIDTokenHint(ctx context.Context, idTokenHint string, verifie
 		return "", nil
 	}
 	claims, err := VerifyIDTokenHint[*oidc.TokenClaims](ctx, idTokenHint, verifier)
-	if err != nil {
+	if err != nil && !errors.As(err, &IDTokenHintExpiredError{}) {
 		return "", oidc.ErrLoginRequired().WithDescription("The id_token_hint is invalid. " +
-			"If you have any questions, you may contact the administrator of the application.")
+			"If you have any questions, you may contact the administrator of the application.").WithParent(err)
 	}
 	return claims.GetSubject(), nil
 }
@@ -406,6 +431,10 @@ func RedirectToLogin(authReqID string, client Client, w http.ResponseWriter, r *
 
 // AuthorizeCallback handles the callback after authentication in the Login UI
 func AuthorizeCallback(w http.ResponseWriter, r *http.Request, authorizer Authorizer) {
+	ctx, span := tracer.Start(r.Context(), "AuthorizeCallback")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	id, err := ParseAuthorizeCallbackRequest(r)
 	if err != nil {
 		AuthRequestError(w, r, nil, err, authorizer)
@@ -438,6 +467,10 @@ func ParseAuthorizeCallbackRequest(r *http.Request) (id string, err error) {
 
 // AuthResponse creates the successful authentication response (either code or tokens)
 func AuthResponse(authReq AuthRequest, authorizer Authorizer, w http.ResponseWriter, r *http.Request) {
+	ctx, span := tracer.Start(r.Context(), "AuthResponse")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	client, err := authorizer.Storage().GetClientByClientID(r.Context(), authReq.GetClientID())
 	if err != nil {
 		AuthRequestError(w, r, authReq, err, authorizer)
@@ -450,26 +483,70 @@ func AuthResponse(authReq AuthRequest, authorizer Authorizer, w http.ResponseWri
 	AuthResponseToken(w, r, authReq, authorizer, client)
 }
 
-// AuthResponseCode creates the successful code authentication response
+// AuthResponseCode handles the creation of a successful authentication response using an authorization code
 func AuthResponseCode(w http.ResponseWriter, r *http.Request, authReq AuthRequest, authorizer Authorizer) {
-	code, err := CreateAuthRequestCode(r.Context(), authReq, authorizer.Storage(), authorizer.Crypto())
+	ctx, span := tracer.Start(r.Context(), "AuthResponseCode")
+	defer span.End()
+	r = r.WithContext(ctx)
+
+	var err error
+	if authReq.GetResponseMode() == oidc.ResponseModeFormPost {
+		err = handleFormPostResponse(w, r, authReq, authorizer)
+	} else {
+		err = handleRedirectResponse(w, r, authReq, authorizer)
+	}
+
 	if err != nil {
 		AuthRequestError(w, r, authReq, err, authorizer)
-		return
 	}
-	codeResponse := struct {
+}
-		Code  string `schema:"code"`
+
-		State string `schema:"state,omitempty"`
+// handleFormPostResponse processes the authentication response using form post method
-	}{
+func handleFormPostResponse(w http.ResponseWriter, r *http.Request, authReq AuthRequest, authorizer Authorizer) error {
-		Code:  code,
+	codeResponse, err := BuildAuthResponseCodeResponsePayload(r.Context(), authReq, authorizer)
-		State: authReq.GetState(),
-	}
-	callback, err := AuthResponseURL(authReq.GetRedirectURI(), authReq.GetResponseType(), authReq.GetResponseMode(), &codeResponse, authorizer.Encoder())
 	if err != nil {
-		AuthRequestError(w, r, authReq, err, authorizer)
+		return err
-		return
 	}
-	http.Redirect(w, r, callback, http.StatusFound)
+	return AuthResponseFormPost(w, authReq.GetRedirectURI(), codeResponse, authorizer.Encoder())
+}
+
+// handleRedirectResponse processes the authentication response using the redirect method
+func handleRedirectResponse(w http.ResponseWriter, r *http.Request, authReq AuthRequest, authorizer Authorizer) error {
+	callbackURL, err := BuildAuthResponseCallbackURL(r.Context(), authReq, authorizer)
+	if err != nil {
+		return err
+	}
+	http.Redirect(w, r, callbackURL, http.StatusFound)
+	return nil
+}
+
+// BuildAuthResponseCodeResponsePayload generates the authorization code response payload for the authentication request
+func BuildAuthResponseCodeResponsePayload(ctx context.Context, authReq AuthRequest, authorizer Authorizer) (*CodeResponseType, error) {
+	code, err := CreateAuthRequestCode(ctx, authReq, authorizer.Storage(), authorizer.Crypto())
+	if err != nil {
+		return nil, err
+	}
+
+	sessionState := ""
+	if authRequestSessionState, ok := authReq.(AuthRequestSessionState); ok {
+		sessionState = authRequestSessionState.GetSessionState()
+	}
+
+	return &CodeResponseType{
+		Code:         code,
+		State:        authReq.GetState(),
+		SessionState: sessionState,
+	}, nil
+}
+
+// BuildAuthResponseCallbackURL generates the callback URL for a successful authorization code response
+func BuildAuthResponseCallbackURL(ctx context.Context, authReq AuthRequest, authorizer Authorizer) (string, error) {
+	codeResponse, err := BuildAuthResponseCodeResponsePayload(ctx, authReq, authorizer)
+	if err != nil {
+		return "", err
+	}
+
+	return AuthResponseURL(authReq.GetRedirectURI(), authReq.GetResponseType(), authReq.GetResponseMode(), codeResponse, authorizer.Encoder())
 }
 
 // AuthResponseToken creates the successful token(s) authentication response
@@ -484,6 +561,17 @@ func AuthResponseToken(w http.ResponseWriter, r *http.Request, authReq AuthReque
 		AuthRequestError(w, r, authReq, err, authorizer)
 		return
 	}
+
+	if authReq.GetResponseMode() == oidc.ResponseModeFormPost {
+		err := AuthResponseFormPost(w, authReq.GetRedirectURI(), resp, authorizer.Encoder())
+		if err != nil {
+			AuthRequestError(w, r, authReq, err, authorizer)
+			return
+		}
+
+		return
+	}
+
 	callback, err := AuthResponseURL(authReq.GetRedirectURI(), authReq.GetResponseType(), authReq.GetResponseMode(), resp, authorizer.Encoder())
 	if err != nil {
 		AuthRequestError(w, r, authReq, err, authorizer)
@@ -494,6 +582,9 @@ func AuthResponseToken(w http.ResponseWriter, r *http.Request, authReq AuthReque
 
 // CreateAuthRequestCode creates and stores a code for the auth code response
 func CreateAuthRequestCode(ctx context.Context, authReq AuthRequest, storage Storage, crypto Crypto) (string, error) {
+	ctx, span := tracer.Start(ctx, "CreateAuthRequestCode")
+	defer span.End()
+
 	code, err := BuildAuthRequestCode(authReq, crypto)
 	if err != nil {
 		return "", err
@@ -535,6 +626,43 @@ func AuthResponseURL(redirectURI string, responseType oidc.ResponseType, respons
 	return mergeQueryParams(uri, params), nil
 }
 
+//go:embed form_post.html.tmpl
+var formPostHtmlTemplate string
+
+var formPostTmpl = template.Must(template.New("form_post").Parse(formPostHtmlTemplate))
+
+// AuthResponseFormPost responds a html page that automatically submits the form which contains the auth response parameters
+func AuthResponseFormPost(res http.ResponseWriter, redirectURI string, response any, encoder httphelper.Encoder) error {
+	values := make(map[string][]string)
+	err := encoder.Encode(response, values)
+	if err != nil {
+		return oidc.ErrServerError().WithParent(err)
+	}
+
+	params := &struct {
+		RedirectURI string
+		Params      any
+	}{
+		RedirectURI: redirectURI,
+		Params:      values,
+	}
+
+	var buf bytes.Buffer
+	err = formPostTmpl.Execute(&buf, params)
+	if err != nil {
+		return oidc.ErrServerError().WithParent(err)
+	}
+
+	res.Header().Set("Cache-Control", "no-store")
+	res.WriteHeader(http.StatusOK)
+	_, err = buf.WriteTo(res)
+	if err != nil {
+		return oidc.ErrServerError().WithParent(err)
+	}
+
+	return nil
+}
+
 func setFragment(uri *url.URL, params url.Values) string {
 	uri.Fragment = params.Encode()
 	return uri.String()

pkg/op/auth_request_test.go

@@ -4,23 +4,23 @@ import (
 	"context"
 	"errors"
 	"io"
+	"log/slog"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"reflect"
 	"testing"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/storage"
+	tu "git.christmann.info/LARA/zitadel-oidc/v3/internal/testutil"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op/mock"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/zitadel/oidc/v3/example/server/storage"
-	tu "github.com/zitadel/oidc/v3/internal/testutil"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
-	"github.com/zitadel/oidc/v3/pkg/op/mock"
 	"github.com/zitadel/schema"
-	"golang.org/x/exp/slog"
 )
 
 func TestAuthorize(t *testing.T) {
@@ -137,11 +137,6 @@ func TestValidateAuthRequest(t *testing.T) {
 			args{&oidc.AuthRequest{}, mock.NewMockStorageExpectValidClientID(t), nil},
 			oidc.ErrInvalidRequest(),
 		},
-		{
-			"scope openid missing fails",
-			args{&oidc.AuthRequest{Scopes: []string{"profile"}}, mock.NewMockStorageExpectValidClientID(t), nil},
-			oidc.ErrInvalidScope(),
-		},
 		{
 			"response_type missing fails",
 			args{&oidc.AuthRequest{Scopes: []string{"openid"}}, mock.NewMockStorageExpectValidClientID(t), nil},
@@ -287,16 +282,6 @@ func TestValidateAuthReqScopes(t *testing.T) {
 				err: true,
 			},
 		},
-		{
-			"scope openid missing fails",
-			args{
-				mock.NewClientExpectAny(t, op.ApplicationTypeWeb),
-				[]string{"email"},
-			},
-			res{
-				err: true,
-			},
-		},
 		{
 			"scope ok",
 			args{
@@ -448,6 +433,24 @@ func TestValidateAuthReqRedirectURI(t *testing.T) {
 			},
 			false,
 		},
+		{
+			"code flow registered https loopback v4 native ok",
+			args{
+				"https://127.0.0.1:4200/callback",
+				mock.NewClientWithConfig(t, []string{"https://127.0.0.1/callback"}, op.ApplicationTypeNative, nil, false),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow registered https loopback v6 native ok",
+			args{
+				"https://[::1]:4200/callback",
+				mock.NewClientWithConfig(t, []string{"https://[::1]/callback"}, op.ApplicationTypeNative, nil, false),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
 		{
 			"code flow unregistered http native fails",
 			args{
@@ -583,6 +586,60 @@ func TestValidateAuthReqRedirectURI(t *testing.T) {
 			},
 			false,
 		},
+		{
+			"code flow dev mode has redirect globs regular ok",
+			args{
+				"http://registered.com/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://registered.com/*"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow dev mode has redirect globs wildcard ok",
+			args{
+				"http://registered.com/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://registered.com/*"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow dev mode has redirect globs double star ok",
+			args{
+				"http://registered.com/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://**/*"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow dev mode has redirect globs double star ok",
+			args{
+				"http://registered.com/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://**/*"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow dev mode has redirect globs IPv6 ok",
+			args{
+				"http://[::1]:80/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://\\[::1\\]:80/*"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			false,
+		},
+		{
+			"code flow dev mode has redirect globs bad pattern",
+			args{
+				"http://registered.com/callback",
+				mock.NewHasRedirectGlobsWithConfig(t, []string{"http://**/\\"}, op.ApplicationTypeUserAgent, nil, true),
+				oidc.ResponseTypeCode,
+			},
+			true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -973,9 +1030,10 @@ func TestAuthResponseCode(t *testing.T) {
 		authorizer func(*testing.T) op.Authorizer
 	}
 	type res struct {
-		wantCode           int
+		wantCode               int
-		wantLocationHeader string
+		wantLocationHeader     string
-		wantBody           string
+		wantCacheControlHeader string
+		wantBody               string
 	}
 	tests := []struct {
 		name string
@@ -1017,7 +1075,7 @@ func TestAuthResponseCode(t *testing.T) {
 				authorizer: func(t *testing.T) op.Authorizer {
 					ctrl := gomock.NewController(t)
 					storage := mock.NewMockStorage(ctrl)
-					storage.EXPECT().SaveAuthCode(context.Background(), "id1", "id1")
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
 
 					authorizer := mock.NewMockAuthorizer(ctrl)
 					authorizer.EXPECT().Storage().Return(storage)
@@ -1032,6 +1090,34 @@ func TestAuthResponseCode(t *testing.T) {
 				wantBody:           "",
 			},
 		},
+		{
+			name: "success with state and session_state",
+			args: args{
+				authReq: &storage.AuthRequestWithSessionState{
+					AuthRequest: &storage.AuthRequest{
+						ID:            "id1",
+						TransferState: "state1",
+					},
+					SessionState: "session_state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantCode:           http.StatusFound,
+				wantLocationHeader: "/auth/callback/?code=id1&session_state=session_state1&state=state1",
+				wantBody:           "",
+			},
+		},
 		{
 			name: "success without state", // reproduce issue #415
 			args: args{
@@ -1042,7 +1128,7 @@ func TestAuthResponseCode(t *testing.T) {
 				authorizer: func(t *testing.T) op.Authorizer {
 					ctrl := gomock.NewController(t)
 					storage := mock.NewMockStorage(ctrl)
-					storage.EXPECT().SaveAuthCode(context.Background(), "id1", "id1")
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
 
 					authorizer := mock.NewMockAuthorizer(ctrl)
 					authorizer.EXPECT().Storage().Return(storage)
@@ -1057,6 +1143,33 @@ func TestAuthResponseCode(t *testing.T) {
 				wantBody:           "",
 			},
 		},
+		{
+			name: "success form_post",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					CallbackURI:   "https://example.com/callback",
+					TransferState: "state1",
+					ResponseMode:  "form_post",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantCode:               http.StatusOK,
+				wantCacheControlHeader: "no-store",
+				wantBody:               "<!doctype html>\n<html>\n<head><meta charset=\"UTF-8\" /></head>\n<body onload=\"javascript:document.forms[0].submit()\">\n<form method=\"post\" action=\"https://example.com/callback\">\n<input type=\"hidden\" name=\"state\" value=\"state1\"/>\n<input type=\"hidden\" name=\"code\" value=\"id1\" />\n\n\n\n\n</form>\n</body>\n</html>",
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -1067,6 +1180,7 @@ func TestAuthResponseCode(t *testing.T) {
 			defer resp.Body.Close()
 			assert.Equal(t, tt.res.wantCode, resp.StatusCode)
 			assert.Equal(t, tt.res.wantLocationHeader, resp.Header.Get("Location"))
+			assert.Equal(t, tt.res.wantCacheControlHeader, resp.Header.Get("Cache-Control"))
 			body, err := io.ReadAll(resp.Body)
 			require.NoError(t, err)
 			assert.Equal(t, tt.res.wantBody, string(body))
@@ -1111,6 +1225,133 @@ func Test_parseAuthorizeCallbackRequest(t *testing.T) {
 	}
 }
 
+func TestBuildAuthResponseCodeResponsePayload(t *testing.T) {
+	type args struct {
+		authReq    op.AuthRequest
+		authorizer func(*testing.T) op.Authorizer
+	}
+	type res struct {
+		wantCode         string
+		wantState        string
+		wantSessionState string
+		wantErr          bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "create code error",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID: "id1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{
+						returnErr: io.ErrClosedPipe,
+					})
+					return authorizer
+				},
+			},
+			res: res{
+				wantErr: true,
+			},
+		},
+		{
+			name: "success with state",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					TransferState: "state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					return authorizer
+				},
+			},
+			res: res{
+				wantCode:  "id1",
+				wantState: "state1",
+			},
+		},
+		{
+			name: "success without state",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					TransferState: "",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					return authorizer
+				},
+			},
+			res: res{
+				wantCode:  "id1",
+				wantState: "",
+			},
+		},
+		{
+			name: "success with session_state",
+			args: args{
+				authReq: &storage.AuthRequestWithSessionState{
+					AuthRequest: &storage.AuthRequest{
+						ID:            "id1",
+						TransferState: "state1",
+					},
+					SessionState: "session_state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					return authorizer
+				},
+			},
+			res: res{
+				wantCode:         "id1",
+				wantState:        "state1",
+				wantSessionState: "session_state1",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := op.BuildAuthResponseCodeResponsePayload(context.Background(), tt.args.authReq, tt.args.authorizer(t))
+			if tt.res.wantErr {
+				assert.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			assert.Equal(t, tt.res.wantCode, got.Code)
+			assert.Equal(t, tt.res.wantState, got.State)
+			assert.Equal(t, tt.res.wantSessionState, got.SessionState)
+		})
+	}
+}
+
 func TestValidateAuthReqIDTokenHint(t *testing.T) {
 	token, _ := tu.ValidIDToken()
 	tests := []struct {
@@ -1141,3 +1382,231 @@ func TestValidateAuthReqIDTokenHint(t *testing.T) {
 		})
 	}
 }
+
+func TestBuildAuthResponseCallbackURL(t *testing.T) {
+	type args struct {
+		authReq    op.AuthRequest
+		authorizer func(*testing.T) op.Authorizer
+	}
+	type res struct {
+		wantURL string
+		wantErr bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "error when generating code response",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID: "id1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{
+						returnErr: io.ErrClosedPipe,
+					})
+					return authorizer
+				},
+			},
+			res: res{
+				wantErr: true,
+			},
+		},
+		{
+			name: "error when generating callback URL",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:          "id1",
+					CallbackURI: "://invalid-url",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantErr: true,
+			},
+		},
+		{
+			name: "success with state",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					CallbackURI:   "https://example.com/callback",
+					TransferState: "state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantURL: "https://example.com/callback?code=id1&state=state1",
+				wantErr: false,
+			},
+		},
+		{
+			name: "success without state",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:          "id1",
+					CallbackURI: "https://example.com/callback",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantURL: "https://example.com/callback?code=id1",
+				wantErr: false,
+			},
+		},
+		{
+			name: "success with session_state",
+			args: args{
+				authReq: &storage.AuthRequestWithSessionState{
+					AuthRequest: &storage.AuthRequest{
+						ID:            "id1",
+						CallbackURI:   "https://example.com/callback",
+						TransferState: "state1",
+					},
+					SessionState: "session_state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantURL: "https://example.com/callback?code=id1&session_state=session_state1&state=state1",
+				wantErr: false,
+			},
+		},
+		{
+			name: "success with existing query parameters",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					CallbackURI:   "https://example.com/callback?param=value",
+					TransferState: "state1",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantURL: "https://example.com/callback?param=value&code=id1&state=state1",
+				wantErr: false,
+			},
+		},
+		{
+			name: "success with fragment response mode",
+			args: args{
+				authReq: &storage.AuthRequest{
+					ID:            "id1",
+					CallbackURI:   "https://example.com/callback",
+					TransferState: "state1",
+					ResponseMode:  "fragment",
+				},
+				authorizer: func(t *testing.T) op.Authorizer {
+					ctrl := gomock.NewController(t)
+					storage := mock.NewMockStorage(ctrl)
+					storage.EXPECT().SaveAuthCode(gomock.Any(), "id1", "id1")
+
+					authorizer := mock.NewMockAuthorizer(ctrl)
+					authorizer.EXPECT().Storage().Return(storage)
+					authorizer.EXPECT().Crypto().Return(&mockCrypto{})
+					authorizer.EXPECT().Encoder().Return(schema.NewEncoder())
+					return authorizer
+				},
+			},
+			res: res{
+				wantURL: "https://example.com/callback#code=id1&state=state1",
+				wantErr: false,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := op.BuildAuthResponseCallbackURL(context.Background(), tt.args.authReq, tt.args.authorizer(t))
+			if tt.res.wantErr {
+				assert.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+
+			if tt.res.wantURL != "" {
+				// Parse the URLs to compare components instead of direct string comparison
+				expectedURL, err := url.Parse(tt.res.wantURL)
+				require.NoError(t, err)
+				actualURL, err := url.Parse(got)
+				require.NoError(t, err)
+
+				// Compare the base parts (scheme, host, path)
+				assert.Equal(t, expectedURL.Scheme, actualURL.Scheme)
+				assert.Equal(t, expectedURL.Host, actualURL.Host)
+				assert.Equal(t, expectedURL.Path, actualURL.Path)
+
+				// Compare the fragment if any
+				assert.Equal(t, expectedURL.Fragment, actualURL.Fragment)
+
+				// For query parameters, compare them independently of order
+				expectedQuery := expectedURL.Query()
+				actualQuery := actualURL.Query()
+
+				assert.Equal(t, len(expectedQuery), len(actualQuery), "Query parameter count does not match")
+
+				for key, expectedValues := range expectedQuery {
+					actualValues, exists := actualQuery[key]
+					assert.True(t, exists, "Expected query parameter %s not found", key)
+					assert.ElementsMatch(t, expectedValues, actualValues, "Values for parameter %s don't match", key)
+				}
+			}
+		})
+	}
+}

pkg/op/client.go

@@ -7,8 +7,8 @@ import (
 	"net/url"
 	"time"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 //go:generate go get github.com/dmarkham/enumer
@@ -63,6 +63,7 @@ type Client interface {
 // such as DevMode for the client being enabled.
 // https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
 type HasRedirectGlobs interface {
+	Client
 	RedirectURIGlobs() []string
 	PostLogoutRedirectURIGlobs() []string
 }
@@ -91,6 +92,9 @@ type ClientJWTProfile interface {
 }
 
 func ClientJWTAuth(ctx context.Context, ca oidc.ClientAssertionParams, verifier ClientJWTProfile) (clientID string, err error) {
+	ctx, span := tracer.Start(ctx, "ClientJWTAuth")
+	defer span.End()
+
 	if ca.ClientAssertion == "" {
 		return "", oidc.ErrInvalidClient().WithParent(ErrNoClientCredentials)
 	}
@@ -103,6 +107,10 @@ func ClientJWTAuth(ctx context.Context, ca oidc.ClientAssertionParams, verifier
 }
 
 func ClientBasicAuth(r *http.Request, storage Storage) (clientID string, err error) {
+	ctx, span := tracer.Start(r.Context(), "ClientBasicAuth")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	clientID, clientSecret, ok := r.BasicAuth()
 	if !ok {
 		return "", oidc.ErrInvalidClient().WithParent(ErrNoClientCredentials)
@@ -150,6 +158,10 @@ func ClientIDFromRequest(r *http.Request, p ClientProvider) (clientID string, au
 		return "", false, oidc.ErrInvalidRequest().WithDescription("cannot parse form").WithParent(err)
 	}
 
+	ctx, span := tracer.Start(r.Context(), "ClientIDFromRequest")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	data := new(clientData)
 	if err = p.Decoder().Decode(data, r.Form); err != nil {
 		return "", false, err
@@ -170,7 +182,7 @@ func ClientIDFromRequest(r *http.Request, p ClientProvider) (clientID string, au
 	}
 	// if the client did not send a Basic Auth Header, ignore the `ErrNoClientCredentials`
 	// but return other errors immediately
-	if err != nil && !errors.Is(err, ErrNoClientCredentials) {
+	if !errors.Is(err, ErrNoClientCredentials) {
 		return "", false, err
 	}
 

pkg/op/client_test.go

@@ -10,13 +10,13 @@ import (
 	"strings"
 	"testing"
 
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op/mock"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
-	"github.com/zitadel/oidc/v3/pkg/op/mock"
 	"github.com/zitadel/schema"
 )
 
@@ -108,7 +108,7 @@ func TestClientBasicAuth(t *testing.T) {
 			},
 			storage: func() op.Storage {
 				s := mock.NewMockStorage(gomock.NewController(t))
-				s.EXPECT().AuthorizeClientIDSecret(context.Background(), "foo", "wrong").Return(errWrong)
+				s.EXPECT().AuthorizeClientIDSecret(gomock.Any(), "foo", "wrong").Return(errWrong)
 				return s
 			}(),
 			wantErr: errWrong,
@@ -121,7 +121,7 @@ func TestClientBasicAuth(t *testing.T) {
 			},
 			storage: func() op.Storage {
 				s := mock.NewMockStorage(gomock.NewController(t))
-				s.EXPECT().AuthorizeClientIDSecret(context.Background(), "foo", "bar").Return(nil)
+				s.EXPECT().AuthorizeClientIDSecret(gomock.Any(), "foo", "bar").Return(nil)
 				return s
 			}(),
 			wantClientID: "foo",
@@ -207,7 +207,7 @@ func TestClientIDFromRequest(t *testing.T) {
 				p: testClientProvider{
 					storage: func() op.Storage {
 						s := mock.NewMockStorage(gomock.NewController(t))
-						s.EXPECT().AuthorizeClientIDSecret(context.Background(), "foo", "bar").Return(nil)
+						s.EXPECT().AuthorizeClientIDSecret(gomock.Any(), "foo", "bar").Return(nil)
 						return s
 					}(),
 				},

pkg/op/config.go

@@ -30,6 +30,7 @@ type Configuration interface {
 	EndSessionEndpoint() *Endpoint
 	KeysEndpoint() *Endpoint
 	DeviceAuthorizationEndpoint() *Endpoint
+	CheckSessionIframe() *Endpoint
 
 	AuthMethodPostSupported() bool
 	CodeMethodS256Supported() bool
@@ -49,6 +50,9 @@ type Configuration interface {
 
 	SupportedUILocales() []language.Tag
 	DeviceAuthorization() DeviceAuthorizationConfig
+
+	BackChannelLogoutSupported() bool
+	BackChannelLogoutSessionSupported() bool
 }
 
 type IssuerFromRequest func(r *http.Request) string

pkg/op/crypto.go

@@ -1,7 +1,7 @@
 package op
 
 import (
-	"github.com/zitadel/oidc/v3/pkg/crypto"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/crypto"
 )
 
 type Crypto interface {

pkg/op/device.go

@@ -9,11 +9,12 @@ import (
 	"math/big"
 	"net/http"
 	"net/url"
+	"slices"
 	"strings"
 	"time"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type DeviceAuthorizationConfig struct {
@@ -63,6 +64,10 @@ func DeviceAuthorizationHandler(o OpenIDProvider) func(http.ResponseWriter, *htt
 }
 
 func DeviceAuthorization(w http.ResponseWriter, r *http.Request, o OpenIDProvider) error {
+	ctx, span := tracer.Start(r.Context(), "DeviceAuthorization")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	req, err := ParseDeviceCodeRequest(r, o)
 	if err != nil {
 		return err
@@ -77,16 +82,16 @@ func DeviceAuthorization(w http.ResponseWriter, r *http.Request, o OpenIDProvide
 }
 
 func createDeviceAuthorization(ctx context.Context, req *oidc.DeviceAuthorizationRequest, clientID string, o OpenIDProvider) (*oidc.DeviceAuthorizationResponse, error) {
+	ctx, span := tracer.Start(ctx, "createDeviceAuthorization")
+	defer span.End()
+
 	storage, err := assertDeviceStorage(o.Storage())
 	if err != nil {
 		return nil, err
 	}
 	config := o.DeviceAuthorization()
 
-	deviceCode, err := NewDeviceCode(RecommendedDeviceCodeBytes)
+	deviceCode, _ := NewDeviceCode(RecommendedDeviceCodeBytes)
-	if err != nil {
-		return nil, NewStatusError(err, http.StatusInternalServerError)
-	}
 	userCode, err := NewUserCode([]rune(config.UserCode.CharSet), config.UserCode.CharAmount, config.UserCode.DashInterval)
 	if err != nil {
 		return nil, NewStatusError(err, http.StatusInternalServerError)
@@ -126,6 +131,10 @@ func createDeviceAuthorization(ctx context.Context, req *oidc.DeviceAuthorizatio
 }
 
 func ParseDeviceCodeRequest(r *http.Request, o OpenIDProvider) (*oidc.DeviceAuthorizationRequest, error) {
+	ctx, span := tracer.Start(r.Context(), "ParseDeviceCodeRequest")
+	r = r.WithContext(ctx)
+	defer span.End()
+
 	clientID, _, err := ClientIDFromRequest(r, o)
 	if err != nil {
 		return nil, err
@@ -151,11 +160,14 @@ func ParseDeviceCodeRequest(r *http.Request, o OpenIDProvider) (*oidc.DeviceAuth
 // results in a 22 character base64 encoded string.
 const RecommendedDeviceCodeBytes = 16
 
+// NewDeviceCode generates a new cryptographically secure device code as a base64 encoded string.
+// The length of the string is nBytes * 4 / 3.
+// An error is never returned.
+//
+// TODO(v4): change return type to string alone.
 func NewDeviceCode(nBytes int) (string, error) {
 	bytes := make([]byte, nBytes)
-	if _, err := rand.Read(bytes); err != nil {
+	rand.Read(bytes)
-		return "", fmt.Errorf("%w getting entropy for device code", err)
-	}
 	return base64.RawURLEncoding.EncodeToString(bytes), nil
 }
 
@@ -185,24 +197,6 @@ func NewUserCode(charSet []rune, charAmount, dashInterval int) (string, error) {
 	return buf.String(), nil
 }
 
-type deviceAccessTokenRequest struct {
-	subject  string
-	audience []string
-	scopes   []string
-}
-
-func (r *deviceAccessTokenRequest) GetSubject() string {
-	return r.subject
-}
-
-func (r *deviceAccessTokenRequest) GetAudience() []string {
-	return r.audience
-}
-
-func (r *deviceAccessTokenRequest) GetScopes() []string {
-	return r.scopes
-}
-
 func DeviceAccessToken(w http.ResponseWriter, r *http.Request, exchanger Exchanger) {
 	ctx, span := tracer.Start(r.Context(), "DeviceAccessToken")
 	defer span.End()
@@ -229,7 +223,7 @@ func deviceAccessToken(w http.ResponseWriter, r *http.Request, exchanger Exchang
 	if err != nil {
 		return err
 	}
-	state, err := CheckDeviceAuthorizationState(ctx, clientID, req.DeviceCode, exchanger)
+	tokenRequest, err := CheckDeviceAuthorizationState(ctx, clientID, req.DeviceCode, exchanger)
 	if err != nil {
 		return err
 	}
@@ -243,11 +237,6 @@ func deviceAccessToken(w http.ResponseWriter, r *http.Request, exchanger Exchang
 			WithDescription("confidential client requires authentication")
 	}
 
-	tokenRequest := &deviceAccessTokenRequest{
-		subject:  state.Subject,
-		audience: []string{clientID},
-		scopes:   state.Scopes,
-	}
 	resp, err := CreateDeviceTokenResponse(r.Context(), tokenRequest, exchanger, client)
 	if err != nil {
 		return err
@@ -265,7 +254,54 @@ func ParseDeviceAccessTokenRequest(r *http.Request, exchanger Exchanger) (*oidc.
 	return req, nil
 }
 
+// DeviceAuthorizationState describes the current state of
+// the device authorization flow.
+// It implements the [IDTokenRequest] interface.
+type DeviceAuthorizationState struct {
+	ClientID string
+	Audience []string
+	Scopes   []string
+	Expires  time.Time // The time after we consider the authorization request timed-out
+	Done     bool      // The user authenticated and approved the authorization request
+	Denied   bool      // The user authenticated and denied the authorization request
+
+	// The following fields are populated after Done == true
+	Subject  string
+	AMR      []string
+	AuthTime time.Time
+}
+
+func (r *DeviceAuthorizationState) GetAMR() []string {
+	return r.AMR
+}
+
+func (r *DeviceAuthorizationState) GetAudience() []string {
+	if !slices.Contains(r.Audience, r.ClientID) {
+		r.Audience = append(r.Audience, r.ClientID)
+	}
+	return r.Audience
+}
+
+func (r *DeviceAuthorizationState) GetAuthTime() time.Time {
+	return r.AuthTime
+}
+
+func (r *DeviceAuthorizationState) GetClientID() string {
+	return r.ClientID
+}
+
+func (r *DeviceAuthorizationState) GetScopes() []string {
+	return r.Scopes
+}
+
+func (r *DeviceAuthorizationState) GetSubject() string {
+	return r.Subject
+}
+
 func CheckDeviceAuthorizationState(ctx context.Context, clientID, deviceCode string, exchanger Exchanger) (*DeviceAuthorizationState, error) {
+	ctx, span := tracer.Start(ctx, "CheckDeviceAuthorizationState")
+	defer span.End()
+
 	storage, err := assertDeviceStorage(exchanger.Storage())
 	if err != nil {
 		return nil, err
@@ -291,15 +327,33 @@ func CheckDeviceAuthorizationState(ctx context.Context, clientID, deviceCode str
 }
 
 func CreateDeviceTokenResponse(ctx context.Context, tokenRequest TokenRequest, creator TokenCreator, client Client) (*oidc.AccessTokenResponse, error) {
+	/* TODO(v4):
+	Change the TokenRequest argument type to *DeviceAuthorizationState.
+	Breaking change that can not be done for v3.
+	*/
+	ctx, span := tracer.Start(ctx, "CreateDeviceTokenResponse")
+	defer span.End()
+
 	accessToken, refreshToken, validity, err := CreateAccessToken(ctx, tokenRequest, client.AccessTokenType(), creator, client, "")
 	if err != nil {
 		return nil, err
 	}
 
-	return &oidc.AccessTokenResponse{
+	response := &oidc.AccessTokenResponse{
 		AccessToken:  accessToken,
 		RefreshToken: refreshToken,
 		TokenType:    oidc.BearerToken,
 		ExpiresIn:    uint64(validity.Seconds()),
-	}, nil
+		Scope:        tokenRequest.GetScopes(),
+	}
+
+	// TODO(v4): remove type assertion
+	if idTokenRequest, ok := tokenRequest.(IDTokenRequest); ok && slices.Contains(tokenRequest.GetScopes(), oidc.ScopeOpenID) {
+		response.IDToken, err = CreateIDToken(ctx, IssuerFromContext(ctx), idTokenRequest, client.IDTokenLifetime(), accessToken, "", creator.Storage(), client)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return response, nil
 }

pkg/op/device_test.go

@@ -13,12 +13,12 @@ import (
 	"testing"
 	"time"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/example/server/storage"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 	"github.com/muhlemmer/gu"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/zitadel/oidc/v3/example/server/storage"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
 )
 
 func Test_deviceAuthorizationHandler(t *testing.T) {
@@ -145,21 +145,11 @@ func runWithRandReader(r io.Reader, f func()) {
 }
 
 func TestNewDeviceCode(t *testing.T) {
-	t.Run("reader error", func(t *testing.T) {
+	for i := 1; i <= 32; i++ {
-		runWithRandReader(errReader{}, func() {
+		got, err := op.NewDeviceCode(i)
-			_, err := op.NewDeviceCode(16)
+		require.NoError(t, err)
-			require.Error(t, err)
+		assert.Len(t, got, base64.RawURLEncoding.EncodedLen(i))
-		})
+	}
-	})
-
-	t.Run("different lengths, rand reader", func(t *testing.T) {
-		for i := 1; i <= 32; i++ {
-			got, err := op.NewDeviceCode(i)
-			require.NoError(t, err)
-			assert.Len(t, got, base64.RawURLEncoding.EncodedLen(i))
-		}
-	})
-
 }
 
 func TestNewUserCode(t *testing.T) {
@@ -453,3 +443,96 @@ func TestCheckDeviceAuthorizationState(t *testing.T) {
 		})
 	}
 }
+
+func TestCreateDeviceTokenResponse(t *testing.T) {
+	tests := []struct {
+		name             string
+		tokenRequest     op.TokenRequest
+		wantAccessToken  bool
+		wantRefreshToken bool
+		wantIDToken      bool
+		wantErr          bool
+	}{
+		{
+			name: "access token",
+			tokenRequest: &op.DeviceAuthorizationState{
+				ClientID: "client1",
+				Subject:  "id1",
+				AMR:      []string{"password"},
+				AuthTime: time.Now(),
+			},
+			wantAccessToken: true,
+		},
+		{
+			name: "access and refresh tokens",
+			tokenRequest: &op.DeviceAuthorizationState{
+				ClientID: "client1",
+				Subject:  "id1",
+				AMR:      []string{"password"},
+				AuthTime: time.Now(),
+				Scopes:   []string{oidc.ScopeOfflineAccess},
+			},
+			wantAccessToken:  true,
+			wantRefreshToken: true,
+		},
+		{
+			name: "access and id token",
+			tokenRequest: &op.DeviceAuthorizationState{
+				ClientID: "client1",
+				Subject:  "id1",
+				AMR:      []string{"password"},
+				AuthTime: time.Now(),
+				Scopes:   []string{oidc.ScopeOpenID},
+			},
+			wantAccessToken: true,
+			wantIDToken:     true,
+		},
+		{
+			name: "access, refresh and id token",
+			tokenRequest: &op.DeviceAuthorizationState{
+				ClientID: "client1",
+				Subject:  "id1",
+				AMR:      []string{"password"},
+				AuthTime: time.Now(),
+				Scopes:   []string{oidc.ScopeOfflineAccess, oidc.ScopeOpenID},
+			},
+			wantAccessToken:  true,
+			wantRefreshToken: true,
+			wantIDToken:      true,
+		},
+		{
+			name: "id token creation error",
+			tokenRequest: &op.DeviceAuthorizationState{
+				ClientID: "client1",
+				Subject:  "foobar",
+				AMR:      []string{"password"},
+				AuthTime: time.Now(),
+				Scopes:   []string{oidc.ScopeOfflineAccess, oidc.ScopeOpenID},
+			},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			client, err := testProvider.Storage().GetClientByClientID(context.Background(), "native")
+			require.NoError(t, err)
+
+			got, err := op.CreateDeviceTokenResponse(context.Background(), tt.tokenRequest, testProvider, client)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			assert.InDelta(t, 300, got.ExpiresIn, 2)
+			if tt.wantAccessToken {
+				assert.NotEmpty(t, got.AccessToken, "access token")
+			}
+			if tt.wantRefreshToken {
+				assert.NotEmpty(t, got.RefreshToken, "refresh token")
+			}
+			if tt.wantIDToken {
+				assert.NotEmpty(t, got.IDToken, "id token")
+			}
+		})
+	}
+}

pkg/op/discovery.go

@@ -4,10 +4,10 @@ import (
 	"context"
 	"net/http"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 )
 
 type DiscoverStorage interface {
@@ -45,6 +45,7 @@ func CreateDiscoveryConfig(ctx context.Context, config Configuration, storage Di
 		EndSessionEndpoint:                         config.EndSessionEndpoint().Absolute(issuer),
 		JwksURI:                                    config.KeysEndpoint().Absolute(issuer),
 		DeviceAuthorizationEndpoint:                config.DeviceAuthorizationEndpoint().Absolute(issuer),
+		CheckSessionIframe:                         config.CheckSessionIframe().Absolute(issuer),
 		ScopesSupported:                            Scopes(config),
 		ResponseTypesSupported:                     ResponseTypes(config),
 		GrantTypesSupported:                        GrantTypes(config),
@@ -61,6 +62,8 @@ func CreateDiscoveryConfig(ctx context.Context, config Configuration, storage Di
 		CodeChallengeMethodsSupported:                      CodeChallengeMethods(config),
 		UILocalesSupported:                                 config.SupportedUILocales(),
 		RequestParameterSupported:                          config.RequestObjectSupported(),
+		BackChannelLogoutSupported:                         config.BackChannelLogoutSupported(),
+		BackChannelLogoutSessionSupported:                  config.BackChannelLogoutSessionSupported(),
 	}
 }
 
@@ -92,11 +95,17 @@ func createDiscoveryConfigV2(ctx context.Context, config Configuration, storage
 		CodeChallengeMethodsSupported:                      CodeChallengeMethods(config),
 		UILocalesSupported:                                 config.SupportedUILocales(),
 		RequestParameterSupported:                          config.RequestObjectSupported(),
+		BackChannelLogoutSupported:                         config.BackChannelLogoutSupported(),
+		BackChannelLogoutSessionSupported:                  config.BackChannelLogoutSessionSupported(),
 	}
 }
 
 func Scopes(c Configuration) []string {
-	return DefaultSupportedScopes // TODO: config
+	provider, ok := c.(*Provider)
+	if ok && provider.config.SupportedScopes != nil {
+		return provider.config.SupportedScopes
+	}
+	return DefaultSupportedScopes
 }
 
 func ResponseTypes(c Configuration) []string {
@@ -131,10 +140,13 @@ func GrantTypes(c Configuration) []oidc.GrantType {
 }
 
 func SubjectTypes(c Configuration) []string {
-	return []string{"public"} //TODO: config
+	return []string{"public"} // TODO: config
 }
 
 func SigAlgorithms(ctx context.Context, storage DiscoverStorage) []string {
+	ctx, span := tracer.Start(ctx, "SigAlgorithms")
+	defer span.End()
+
 	algorithms, err := storage.SignatureAlgorithms(ctx)
 	if err != nil {
 		return nil
@@ -213,32 +225,12 @@ func AuthMethodsRevocationEndpoint(c Configuration) []oidc.AuthMethod {
 }
 
 func SupportedClaims(c Configuration) []string {
-	return []string{ // TODO: config
+	provider, ok := c.(*Provider)
-		"sub",
+	if ok && provider.config.SupportedClaims != nil {
-		"aud",
+		return provider.config.SupportedClaims
-		"exp",
-		"iat",
-		"iss",
-		"auth_time",
-		"nonce",
-		"acr",
-		"amr",
-		"c_hash",
-		"at_hash",
-		"act",
-		"scopes",
-		"client_id",
-		"azp",
-		"preferred_username",
-		"name",
-		"family_name",
-		"given_name",
-		"locale",
-		"email",
-		"email_verified",
-		"phone_number",
-		"phone_number_verified",
 	}
+
+	return DefaultSupportedClaims
 }
 
 func CodeChallengeMethods(c Configuration) []oidc.CodeChallengeMethod {

pkg/op/discovery_test.go

@@ -6,14 +6,14 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	jose "github.com/go-jose/go-jose/v3"
+	jose "github.com/go-jose/go-jose/v4"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"github.com/zitadel/oidc/v3/pkg/op"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
-	"github.com/zitadel/oidc/v3/pkg/op/mock"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op/mock"
 )
 
 func TestDiscover(t *testing.T) {
@@ -81,6 +81,11 @@ func Test_scopes(t *testing.T) {
 			args{},
 			op.DefaultSupportedScopes,
 		},
+		{
+			"custom scopes",
+			args{newTestProvider(&op.Config{SupportedScopes: []string{"test1", "test2"}})},
+			[]string{"test1", "test2"},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/op/endpoint_test.go

@@ -3,8 +3,8 @@ package op_test
 import (
 	"testing"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/op"
 	"github.com/stretchr/testify/require"
-	"github.com/zitadel/oidc/v3/pkg/op"
 )
 
 func TestEndpoint_Path(t *testing.T) {

pkg/op/error.go

@@ -4,11 +4,11 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"net/http"
 
-	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	httphelper "git.christmann.info/LARA/zitadel-oidc/v3/pkg/http"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
-	"golang.org/x/exp/slog"
 )
 
 type ErrAuthRequest interface {
@@ -46,6 +46,12 @@ func AuthRequestError(w http.ResponseWriter, r *http.Request, authReq ErrAuthReq
 		return
 	}
 	e.State = authReq.GetState()
+	var sessionState string
+	authRequestSessionState, ok := authReq.(AuthRequestSessionState)
+	if ok {
+		sessionState = authRequestSessionState.GetSessionState()
+	}
+	e.SessionState = sessionState
 	var responseMode oidc.ResponseMode
 	if rm, ok := authReq.(interface{ GetResponseMode() oidc.ResponseMode }); ok {
 		responseMode = rm.GetResponseMode()
@@ -92,6 +98,12 @@ func TryErrorRedirect(ctx context.Context, authReq ErrAuthRequest, parent error,
 	}
 
 	e.State = authReq.GetState()
+	var sessionState string
+	authRequestSessionState, ok := authReq.(AuthRequestSessionState)
+	if ok {
+		sessionState = authRequestSessionState.GetSessionState()
+	}
+	e.SessionState = sessionState
 	var responseMode oidc.ResponseMode
 	if rm, ok := authReq.(interface{ GetResponseMode() oidc.ResponseMode }); ok {
 		responseMode = rm.GetResponseMode()
@@ -157,13 +169,29 @@ func (e StatusError) Is(err error) bool {
 		e.statusCode == target.statusCode
 }
 
-// WriteError asserts for a StatusError containing an [oidc.Error].
+// WriteError asserts for a [StatusError] containing an [oidc.Error].
-// If no StatusError is found, the status code will default to [http.StatusBadRequest].
+// If no `StatusError` is found, the status code will default to [http.StatusBadRequest].
-// If no [oidc.Error] was found in the parent, the error type defaults to [oidc.ServerError].
+// If no `oidc.Error` was found in the parent, the error type defaults to [oidc.ServerError].
+// When there was no `StatusError` and the `oidc.Error` is of type `oidc.ServerError`,
+// the status code will be set to [http.StatusInternalServerError]
 func WriteError(w http.ResponseWriter, r *http.Request, err error, logger *slog.Logger) {
-	statusError := AsStatusError(err, http.StatusBadRequest)
+	var statusError StatusError
-	e := oidc.DefaultToServerError(statusError.parent, statusError.parent.Error())
+	if errors.As(err, &statusError) {
-
+		writeError(w, r,
-	logger.Log(r.Context(), e.LogLevel(), "request error", "oidc_error", e)
+			oidc.DefaultToServerError(statusError.parent, statusError.parent.Error()),
-	httphelper.MarshalJSONWithStatus(w, e, statusError.statusCode)
+			statusError.statusCode, logger,
+		)
+		return
+	}
+	statusCode := http.StatusBadRequest
+	e := oidc.DefaultToServerError(err, err.Error())
+	if e.ErrorType == oidc.ServerError {
+		statusCode = http.StatusInternalServerError
+	}
+	writeError(w, r, e, statusCode, logger)
+}
+
+func writeError(w http.ResponseWriter, r *http.Request, err *oidc.Error, statusCode int, logger *slog.Logger) {
+	logger.Log(r.Context(), err.LogLevel(), "request error", "oidc_error", err, "status_code", statusCode)
+	httphelper.MarshalJSONWithStatus(w, err, statusCode)
 }

pkg/op/error_test.go

@@ -4,17 +4,17 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"log/slog"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"strings"
 	"testing"
 
+	"git.christmann.info/LARA/zitadel-oidc/v3/pkg/oidc"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 	"github.com/zitadel/schema"
-	"golang.org/x/exp/slog"
 )
 
 func TestAuthRequestError(t *testing.T) {
@@ -428,7 +428,8 @@ func TestTryErrorRedirect(t *testing.T) {
 				parent: oidc.ErrInteractionRequired().WithDescription("sign in"),
 			},
 			want: &Redirect{
-				URL: "http://example.com/callback?error=interaction_required&error_description=sign+in&state=state1",
+				Header: make(http.Header),
+				URL:    "http://example.com/callback?error=interaction_required&error_description=sign+in&state=state1",
 			},
 			wantLog: `{
 						"level":"WARN",
@@ -579,7 +580,7 @@ func TestWriteError(t *testing.T) {
 		{
 			name:       "not a status or oidc error",
 			err:        io.ErrClosedPipe,
-			wantStatus: http.StatusBadRequest,
+			wantStatus: http.StatusInternalServerError,
 			wantBody: `{
 				"error":"server_error",
 				"error_description":"io: read/write on closed pipe"
@@ -592,6 +593,7 @@ func TestWriteError(t *testing.T) {
 					"parent":"io: read/write on closed pipe",
 					"type":"server_error"
 				},
+				"status_code":500,
 				"time":"not"
 			}`,
 		},
@@ -611,6 +613,7 @@ func TestWriteError(t *testing.T) {
 					"parent":"io: read/write on closed pipe",
 					"type":"server_error"
 				},
+				"status_code":500,
 				"time":"not"
 			}`,
 		},
@@ -629,6 +632,7 @@ func TestWriteError(t *testing.T) {
 					"description":"oops",
 					"type":"invalid_request"
 				},
+				"status_code":400,
 				"time":"not"
 			}`,
 		},
@@ -650,6 +654,7 @@ func TestWriteError(t *testing.T) {
 					"description":"oops",
 					"type":"unauthorized_client"
 				},
+				"status_code":401,
 				"time":"not"
 			}`,
 		},

pkg/op/form_post.html.tmpl

@@ -0,0 +1,14 @@
+<!doctype html>
+<html>
+<head><meta charset="UTF-8" /></head>
+<body onload="javascript:document.forms[0].submit()">
+<form method="post" action="{{ .RedirectURI }}">
+{{with .Params.state}}<input type="hidden" name="state" value="{{ index . 0 }}"/>{{end}}
+{{with .Params.code}}<input type="hidden" name="code" value="{{ index . 0 }}" />{{end}}
+{{with .Params.id_token}}<input type="hidden" name="id_token" value="{{ index . 0 }}"/>{{end}}
+{{with .Params.access_token}}<input type="hidden" name="access_token" value="{{ index . 0 }}" />{{end}}
+{{with .Params.token_type}}<input type="hidden" name="token_type" value="{{ index . 0 }}" />{{end}}
+{{with .Params.expires_in}}<input type="hidden" name="expires_in" value="{{ index . 0 }}" />{{end}}
+</form>
+</body>
+</html>