docs(example): implement OpenID Provider (#165)
* chore(example): implement OpenID Provider * jwt profile and fixes * some comments * remove old op example * fix code flow example * add service user and update readme * fix password for example use * ignore example and mock folders for code coverage * Update example/server/internal/storage.go Co-authored-by: Silvan <silvan.reusser@gmail.com> * Update client.go Co-authored-by: Silvan <silvan.reusser@gmail.com>
This commit is contained in:
Livio Amstutz
GitHub
parent
c195452bb0
commit
885fe0d45c
13 changed files with 1280 additions and 427 deletions
553
example/server/internal/storage.go
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553
example/server/internal/storage.go
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package internal
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import (
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"context"
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"crypto/rand"
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"crypto/rsa"
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"fmt"
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"math/big"
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"time"
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"github.com/google/uuid"
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"golang.org/x/text/language"
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"gopkg.in/square/go-jose.v2"
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"github.com/caos/oidc/pkg/oidc"
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"github.com/caos/oidc/pkg/op"
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)
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var (
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//serviceKey1 is a public key which will be used for the JWT Profile Authorization Grant
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//the corresponding private key is in the service-key1.json (for demonstration purposes)
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serviceKey1 = &rsa.PublicKey{
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N: func() *big.Int {
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n, _ := new(big.Int).SetString("00f6d44fb5f34ac2033a75e73cb65ff24e6181edc58845e75a560ac21378284977bb055b1a75b714874e2a2641806205681c09abec76efd52cf40984edcf4c8ca09717355d11ac338f280d3e4c905b00543bdb8ee5a417496cb50cb0e29afc5a0d0471fd5a2fa625bd5281f61e6b02067d4fe7a5349eeae6d6a4300bcd86eef331", 16)
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return n
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}(),
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E: 65537,
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}
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)
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//storage implements the op.Storage interface
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//typically you would implement this as a layer on top of your database
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//for simplicity this example keeps everything in-memory
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type storage struct {
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authRequests map[string]*AuthRequest
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codes map[string]string
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tokens map[string]*Token
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clients map[string]*Client
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users map[string]*User
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services map[string]Service
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refreshTokens map[string]*RefreshToken
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signingKey signingKey
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}
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type signingKey struct {
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ID string
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Algorithm string
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Key *rsa.PrivateKey
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}
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func NewStorage() *storage {
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key, _ := rsa.GenerateKey(rand.Reader, 2048)
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return &storage{
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authRequests: make(map[string]*AuthRequest),
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codes: make(map[string]string),
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tokens: make(map[string]*Token),
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refreshTokens: make(map[string]*RefreshToken),
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clients: clients,
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users: map[string]*User{
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"id1": {
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id: "id1",
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username: "test-user",
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password: "verysecure",
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firstname: "Test",
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lastname: "User",
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email: "test-user@zitadel.ch",
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emailVerified: true,
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phone: "",
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phoneVerified: false,
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preferredLanguage: language.German,
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},
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},
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services: map[string]Service{
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"service": {
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keys: map[string]*rsa.PublicKey{
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"key1": serviceKey1,
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},
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},
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},
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signingKey: signingKey{
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ID: "id",
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Algorithm: "RS256",
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Key: key,
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},
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}
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}
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//CheckUsernamePassword implements the `authenticate` interface of the login
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func (s *storage) CheckUsernamePassword(username, password, id string) error {
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request, ok := s.authRequests[id]
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if !ok {
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return fmt.Errorf("request not found")
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}
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//for demonstration purposes we'll check on a static list with plain text password
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//for real world scenarios, be sure to have the password hashed and salted (e.g. using bcrypt)
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for _, user := range s.users {
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if user.username == username && user.password == password {
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//be sure to set user id into the auth request after the user was checked,
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//so that you'll be able to get more information about the user after the login
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request.UserID = user.id
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//you will have to change some state on the request to guide the user through possible multiple steps of the login process
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//in this example we'll simply check the username / password and set a boolean to true
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//therefore we will also just check this boolean if the request / login has been finished
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request.passwordChecked = true
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return nil
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}
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}
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return fmt.Errorf("username or password wrong")
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}
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//CreateAuthRequest implements the op.Storage interface
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//it will be called after parsing and validation of the authentication request
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func (s *storage) CreateAuthRequest(ctx context.Context, authReq *oidc.AuthRequest, userID string) (op.AuthRequest, error) {
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//typically, you'll fill your internal / storage model with the information of the passed object
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request := authRequestToInternal(authReq, userID)
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//you'll also have to create a unique id for the request (this might be done by your database; we'll use a uuid)
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request.ID = uuid.NewString()
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//and save it in your database (for demonstration purposed we will use a simple map)
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s.authRequests[request.ID] = request
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//finally, return the request (which implements the AuthRequest interface of the OP
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return request, nil
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}
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//AuthRequestByID implements the op.Storage interface
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//it will be called after the Login UI redirects back to the OIDC endpoint
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func (s *storage) AuthRequestByID(ctx context.Context, id string) (op.AuthRequest, error) {
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request, ok := s.authRequests[id]
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if !ok {
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return nil, fmt.Errorf("request not found")
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}
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return request, nil
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}
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//AuthRequestByCode implements the op.Storage interface
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//it will be called after parsing and validation of the token request (in an authorization code flow)
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func (s *storage) AuthRequestByCode(ctx context.Context, code string) (op.AuthRequest, error) {
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//for this example we read the id by code and then get the request by id
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requestID, ok := s.codes[code]
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if !ok {
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return nil, fmt.Errorf("code invalid or expired")
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}
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return s.AuthRequestByID(ctx, requestID)
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}
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//SaveAuthCode implements the op.Storage interface
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//it will be called after the authentication has been successful and before redirecting the user agent to the redirect_uri
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//(in an authorization code flow)
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func (s *storage) SaveAuthCode(ctx context.Context, id string, code string) error {
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//for this example we'll just save the authRequestID to the code
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s.codes[code] = id
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return nil
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}
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//DeleteAuthRequest implements the op.Storage interface
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//it will be called after creating the token response (id and access tokens) for a valid
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//- authentication request (in an implicit flow)
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//- token request (in an authorization code flow)
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func (s *storage) DeleteAuthRequest(ctx context.Context, id string) error {
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//you can simply delete all reference to the auth request
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delete(s.authRequests, id)
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for code, requestID := range s.codes {
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if id == requestID {
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delete(s.codes, code)
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return nil
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}
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}
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return nil
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}
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//CreateAccessToken implements the op.Storage interface
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//it will be called for all requests able to return an access token (Authorization Code Flow, Implicit Flow, JWT Profile, ...)
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func (s *storage) CreateAccessToken(ctx context.Context, request op.TokenRequest) (string, time.Time, error) {
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var applicationID string
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//if authenticated for an app (auth code / implicit flow) we must save the client_id to the token
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authReq, ok := request.(*AuthRequest)
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if ok {
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applicationID = authReq.ApplicationID
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}
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token, err := s.accessToken(applicationID, "", request.GetSubject(), request.GetAudience(), request.GetScopes())
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if err != nil {
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return "", time.Time{}, err
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}
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return token.ID, token.Expiration, nil
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}
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//CreateAccessAndRefreshTokens implements the op.Storage interface
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//it will be called for all requests able to return an access and refresh token (Authorization Code Flow, Refresh Token Request)
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func (s *storage) CreateAccessAndRefreshTokens(ctx context.Context, request op.TokenRequest, currentRefreshToken string) (accessTokenID string, newRefreshToken string, expiration time.Time, err error) {
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//get the information depending on the request type / implementation
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applicationID, authTime, amr := getInfoFromRequest(request)
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//if currentRefreshToken is empty (Code Flow) we will have to create a new refresh token
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if currentRefreshToken == "" {
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refreshTokenID := uuid.NewString()
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accessToken, err := s.accessToken(applicationID, refreshTokenID, request.GetSubject(), request.GetAudience(), request.GetScopes())
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if err != nil {
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return "", "", time.Time{}, err
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}
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refreshToken, err := s.createRefreshToken(accessToken, amr, authTime)
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if err != nil {
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return "", "", time.Time{}, err
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}
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return accessToken.ID, refreshToken, accessToken.Expiration, nil
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}
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//if we get here, the currentRefreshToken was not empty, so the call is a refresh token request
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//we therefore will have to check the currentRefreshToken and renew the refresh token
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refreshToken, refreshTokenID, err := s.renewRefreshToken(currentRefreshToken)
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if err != nil {
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return "", "", time.Time{}, err
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}
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accessToken, err := s.accessToken(applicationID, refreshTokenID, request.GetSubject(), request.GetAudience(), request.GetScopes())
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if err != nil {
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return "", "", time.Time{}, err
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}
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return accessToken.ID, refreshToken, accessToken.Expiration, nil
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}
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//TokenRequestByRefreshToken implements the op.Storage interface
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//it will be called after parsing and validation of the refresh token request
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func (s *storage) TokenRequestByRefreshToken(ctx context.Context, refreshToken string) (op.RefreshTokenRequest, error) {
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token, ok := s.refreshTokens[refreshToken]
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if !ok {
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return nil, fmt.Errorf("invalid refresh_token")
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}
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return RefreshTokenRequestFromBusiness(token), nil
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}
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//TerminateSession implements the op.Storage interface
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//it will be called after the user signed out, therefore the access and refresh token of the user of this client must be removed
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func (s *storage) TerminateSession(ctx context.Context, userID string, clientID string) error {
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for _, token := range s.tokens {
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if token.ApplicationID == clientID && token.Subject == userID {
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delete(s.tokens, token.ID)
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delete(s.refreshTokens, token.RefreshTokenID)
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return nil
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}
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}
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return nil
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}
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//RevokeToken implements the op.Storage interface
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//it will be called after parsing and validation of the token revocation request
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func (s *storage) RevokeToken(ctx context.Context, token string, userID string, clientID string) *oidc.Error {
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//a single token was requested to be removed
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accessToken, ok := s.tokens[token]
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if ok {
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if accessToken.ApplicationID != clientID {
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return oidc.ErrInvalidClient().WithDescription("token was not issued for this client")
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}
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//if it is an access token, just remove it
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//you could also remove the corresponding refresh token if really necessary
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delete(s.tokens, accessToken.ID)
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return nil
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}
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refreshToken, ok := s.refreshTokens[token]
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if !ok {
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//if the token is neither an access nor a refresh token, just ignore it, the expected behaviour of
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//being not valid (anymore) is achieved
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return nil
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}
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if refreshToken.ApplicationID != clientID {
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return oidc.ErrInvalidClient().WithDescription("token was not issued for this client")
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}
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//if it is a refresh token, you will have to remove the access token as well
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delete(s.refreshTokens, refreshToken.ID)
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for _, accessToken := range s.tokens {
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if accessToken.RefreshTokenID == refreshToken.ID {
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delete(s.tokens, accessToken.ID)
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return nil
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}
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}
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return nil
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}
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//GetSigningKey implements the op.Storage interface
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//it will be called when creating the OpenID Provider
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func (s *storage) GetSigningKey(ctx context.Context, keyCh chan<- jose.SigningKey) {
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//in this example the signing key is a static rsa.PrivateKey and the algorithm used is RS256
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//you would obviously have a more complex implementation and store / retrieve the key from your database as well
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//
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//the idea of the signing key channel is, that you can (with what ever mechanism) rotate your signing key and
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//switch the key of the signer via this channel
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keyCh <- jose.SigningKey{
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Algorithm: jose.SignatureAlgorithm(s.signingKey.Algorithm), //always tell the signer with algorithm to use
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Key: jose.JSONWebKey{
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KeyID: s.signingKey.ID, //always give the key an id so, that it will include it in the token header as `kid` claim
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Key: s.signingKey.Key,
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},
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}
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}
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//GetKeySet implements the op.Storage interface
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//it will be called to get the current (public) keys, among others for the keys_endpoint or for validating access_tokens on the userinfo_endpoint, ...
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func (s *storage) GetKeySet(ctx context.Context) (*jose.JSONWebKeySet, error) {
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//as mentioned above, this example only has a single signing key without key rotation,
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//so it will directly use its public key
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//
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//when using key rotation you typically would store the public keys alongside the private keys in your database
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//and give both of them an expiration date, with the public key having a longer lifetime (e.g. rotate private key every
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return &jose.JSONWebKeySet{Keys: []jose.JSONWebKey{
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{
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KeyID: s.signingKey.ID,
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Algorithm: s.signingKey.Algorithm,
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Use: oidc.KeyUseSignature,
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Key: &s.signingKey.Key.PublicKey,
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}},
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}, nil
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}
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//GetClientByClientID implements the op.Storage interface
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//it will be called whenever information (type, redirect_uris, ...) about the client behind the client_id is needed
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func (s *storage) GetClientByClientID(ctx context.Context, clientID string) (op.Client, error) {
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client, ok := s.clients[clientID]
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if !ok {
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return nil, fmt.Errorf("client not found")
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}
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return client, nil
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}
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//AuthorizeClientIDSecret implements the op.Storage interface
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//it will be called for validating the client_id, client_secret on token or introspection requests
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func (s *storage) AuthorizeClientIDSecret(ctx context.Context, clientID, clientSecret string) error {
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client, ok := s.clients[clientID]
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if !ok {
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return fmt.Errorf("client not found")
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}
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//for this example we directly check the secret
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//obviously you would not have the secret in plain text, but rather hashed and salted (e.g. using bcrypt)
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if client.secret != clientSecret {
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return fmt.Errorf("invalid secret")
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}
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return nil
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}
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//SetUserinfoFromScopes implements the op.Storage interface
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//it will be called for the creation of an id_token, so we'll just pass it to the private function without any further check
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func (s *storage) SetUserinfoFromScopes(ctx context.Context, userinfo oidc.UserInfoSetter, userID, clientID string, scopes []string) error {
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return s.setUserinfo(ctx, userinfo, userID, clientID, scopes)
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}
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//SetUserinfoFromToken implements the op.Storage interface
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//it will be called for the userinfo endpoint, so we read the token and pass the information from that to the private function
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func (s *storage) SetUserinfoFromToken(ctx context.Context, userinfo oidc.UserInfoSetter, tokenID, subject, origin string) error {
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token, ok := s.tokens[tokenID]
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if !ok {
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return fmt.Errorf("token is invalid or has expired")
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}
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//the userinfo endpoint should support CORS. If it's not possible to specify a specific origin in the CORS handler,
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//and you have to specify a wildcard (*) origin, then you could also check here if the origin which called the userinfo endpoint here directly
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//note that the origin can be empty (if called by a web client)
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//
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//if origin != "" {
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// client, ok := s.clients[token.ApplicationID]
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// if !ok {
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// return fmt.Errorf("client not found")
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// }
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// if err := checkAllowedOrigins(client.allowedOrigins, origin); err != nil {
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// return err
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// }
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//}
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return s.setUserinfo(ctx, userinfo, token.Subject, token.ApplicationID, token.Scopes)
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}
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//SetIntrospectionFromToken implements the op.Storage interface
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//it will be called for the introspection endpoint, so we read the token and pass the information from that to the private function
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func (s *storage) SetIntrospectionFromToken(ctx context.Context, introspection oidc.IntrospectionResponse, tokenID, subject, clientID string) error {
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token, ok := s.tokens[tokenID]
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if !ok {
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return fmt.Errorf("token is invalid or has expired")
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}
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//check if the client is part of the requested audience
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for _, aud := range token.Audience {
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if aud == clientID {
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//the introspection response only has to return a boolean (active) if the token is active
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//this will automatically be done by the library if you don't return an error
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//you can also return further information about the user / associated token
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//e.g. the userinfo (equivalent to userinfo endpoint)
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err := s.setUserinfo(ctx, introspection, subject, clientID, token.Scopes)
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if err != nil {
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return err
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}
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//...and also the requested scopes...
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introspection.SetScopes(token.Scopes)
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//...and the client the token was issued to
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introspection.SetClientID(token.ApplicationID)
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return nil
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}
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}
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return fmt.Errorf("token is not valid for this client")
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}
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//GetPrivateClaimsFromScopes implements the op.Storage interface
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//it will be called for the creation of a JWT access token to assert claims for custom scopes
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func (s *storage) GetPrivateClaimsFromScopes(ctx context.Context, userID, clientID string, scopes []string) (claims map[string]interface{}, err error) {
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for _, scope := range scopes {
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switch scope {
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case CustomScope:
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claims = appendClaim(claims, CustomClaim, customClaim(clientID))
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}
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}
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return claims, nil
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}
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//GetKeyByIDAndUserID implements the op.Storage interface
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//it will be called to validate the signatures of a JWT (JWT Profile Grant and Authentication)
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func (s *storage) GetKeyByIDAndUserID(ctx context.Context, keyID, userID string) (*jose.JSONWebKey, error) {
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service, ok := s.services[userID]
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if !ok {
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return nil, fmt.Errorf("user not found")
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}
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key, ok := service.keys[keyID]
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if !ok {
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return nil, fmt.Errorf("key not found")
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}
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return &jose.JSONWebKey{
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KeyID: keyID,
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Use: "sig",
|
||||
Key: key,
|
||||
}, nil
|
||||
}
|
||||
|
||||
//ValidateJWTProfileScopes implements the op.Storage interface
|
||||
//it will be called to validate the scopes of a JWT Profile Authorization Grant request
|
||||
func (s *storage) ValidateJWTProfileScopes(ctx context.Context, userID string, scopes []string) ([]string, error) {
|
||||
allowedScopes := make([]string, 0)
|
||||
for _, scope := range scopes {
|
||||
if scope == oidc.ScopeOpenID {
|
||||
allowedScopes = append(allowedScopes, scope)
|
||||
}
|
||||
}
|
||||
return allowedScopes, nil
|
||||
}
|
||||
|
||||
//Health implements the op.Storage interface
|
||||
func (s *storage) Health(ctx context.Context) error {
|
||||
return nil
|
||||
}
|
||||
|
||||
//createRefreshToken will store a refresh_token in-memory based on the provided information
|
||||
func (s *storage) createRefreshToken(accessToken *Token, amr []string, authTime time.Time) (string, error) {
|
||||
token := &RefreshToken{
|
||||
ID: accessToken.RefreshTokenID,
|
||||
Token: accessToken.RefreshTokenID,
|
||||
AuthTime: authTime,
|
||||
AMR: amr,
|
||||
ApplicationID: accessToken.ApplicationID,
|
||||
UserID: accessToken.Subject,
|
||||
Audience: accessToken.Audience,
|
||||
Expiration: time.Now().Add(5 * time.Hour),
|
||||
Scopes: accessToken.Scopes,
|
||||
}
|
||||
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) {
|
||||
refreshToken, ok := s.refreshTokens[currentRefreshToken]
|
||||
if !ok {
|
||||
return "", "", fmt.Errorf("invalid refresh token")
|
||||
}
|
||||
//deletes the refresh token and all access tokens which were issued based on this refresh token
|
||||
delete(s.refreshTokens, currentRefreshToken)
|
||||
for _, token := range s.tokens {
|
||||
if token.RefreshTokenID == currentRefreshToken {
|
||||
delete(s.tokens, token.ID)
|
||||
break
|
||||
}
|
||||
}
|
||||
//creates a new refresh token based on the current one
|
||||
token := uuid.NewString()
|
||||
refreshToken.Token = token
|
||||
s.refreshTokens[token] = refreshToken
|
||||
return token, refreshToken.ID, nil
|
||||
}
|
||||
|
||||
//accessToken will store an access_token in-memory based on the provided information
|
||||
func (s *storage) accessToken(applicationID, refreshTokenID, subject string, audience, scopes []string) (*Token, error) {
|
||||
token := &Token{
|
||||
ID: uuid.NewString(),
|
||||
ApplicationID: applicationID,
|
||||
RefreshTokenID: refreshTokenID,
|
||||
Subject: subject,
|
||||
Audience: audience,
|
||||
Expiration: time.Now().Add(5 * time.Minute),
|
||||
Scopes: scopes,
|
||||
}
|
||||
s.tokens[token.ID] = token
|
||||
return token, nil
|
||||
}
|
||||
|
||||
//setUserinfo sets the info based on the user, scopes and if necessary the clientID
|
||||
func (s *storage) setUserinfo(ctx context.Context, userInfo oidc.UserInfoSetter, userID, clientID string, scopes []string) (err error) {
|
||||
user, ok := s.users[userID]
|
||||
if !ok {
|
||||
return fmt.Errorf("user not found")
|
||||
}
|
||||
for _, scope := range scopes {
|
||||
switch scope {
|
||||
case oidc.ScopeOpenID:
|
||||
userInfo.SetSubject(user.id)
|
||||
case oidc.ScopeEmail:
|
||||
userInfo.SetEmail(user.email, user.emailVerified)
|
||||
case oidc.ScopeProfile:
|
||||
userInfo.SetPreferredUsername(user.username)
|
||||
userInfo.SetName(user.firstname + " " + user.lastname)
|
||||
userInfo.SetFamilyName(user.lastname)
|
||||
userInfo.SetGivenName(user.firstname)
|
||||
userInfo.SetLocale(user.preferredLanguage)
|
||||
case oidc.ScopePhone:
|
||||
userInfo.SetPhone(user.phone, user.phoneVerified)
|
||||
case CustomScope:
|
||||
//you can also have a custom scope and assert public or custom claims based on that
|
||||
userInfo.AppendClaims(CustomClaim, customClaim(clientID))
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
//getInfoFromRequest returns the clientID, authTime and amr depending on the op.TokenRequest type / implementation
|
||||
func getInfoFromRequest(req op.TokenRequest) (clientID string, authTime time.Time, amr []string) {
|
||||
authReq, ok := req.(*AuthRequest) //Code Flow (with scope offline_access)
|
||||
if ok {
|
||||
return authReq.ApplicationID, authReq.authTime, authReq.GetAMR()
|
||||
}
|
||||
refreshReq, ok := req.(*RefreshTokenRequest) //Refresh Token Request
|
||||
if ok {
|
||||
return refreshReq.ApplicationID, refreshReq.AuthTime, refreshReq.AMR
|
||||
}
|
||||
return "", time.Time{}, nil
|
||||
}
|
||||
|
||||
//customClaim demonstrates how to return custom claims based on provided information
|
||||
func customClaim(clientID string) map[string]interface{} {
|
||||
return map[string]interface{}{
|
||||
"client": clientID,
|
||||
"other": "stuff",
|
||||
}
|
||||
}
|
||||
|
||||
func appendClaim(claims map[string]interface{}, claim string, value interface{}) map[string]interface{} {
|
||||
if claims == nil {
|
||||
claims = make(map[string]interface{})
|
||||
}
|
||||
claims[claim] = value
|
||||
return claims
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue