From 3d5de74d02486c2300133f40834df71b4213fdaf Mon Sep 17 00:00:00 2001
From: Livio Amstutz <livio.a@gmail.com>
Date: Thu, 21 Nov 2019 16:38:51 +0100
Subject: [PATCH] begin parsing

---
 pkg/oidc/authorization.go | 73 ++++++++++++++++++++++++++++++---------
 pkg/op/authrequest.go     | 15 +++++++-
 pkg/op/go.mod             |  1 +
 pkg/utils/formParser.go   |  1 +
 4 files changed, 73 insertions(+), 17 deletions(-)
 create mode 100644 pkg/utils/formParser.go

diff --git a/pkg/oidc/authorization.go b/pkg/oidc/authorization.go
index e26568e..ed75f58 100644
--- a/pkg/oidc/authorization.go
+++ b/pkg/oidc/authorization.go
@@ -1,6 +1,9 @@
 package oidc
 
 import (
+	"errors"
+	"strings"
+
 	"golang.org/x/text/language"
 )
 
@@ -9,10 +12,10 @@ const (
 	ResponseTypeIDToken     = "id_token token"
 	ResponseTypeIDTokenOnly = "id_token"
 
-	DisplayPage  = "page"
-	DisplayPopup = "popup"
-	DisplayTouch = "touch"
-	DisplayWAP   = "wap"
+	DisplayPage  Display = "page"
+	DisplayPopup Display = "popup"
+	DisplayTouch Display = "touch"
+	DisplayWAP   Display = "wap"
 
 	PromptNone          = "none"
 	PromptLogin         = "login"
@@ -20,31 +23,69 @@ const (
 	PromptSelectAccount = "select_account"
 )
 
+var displayValues = map[string]Display{
+	"page":  DisplayPage,
+	"popup": DisplayPopup,
+	"touch": DisplayTouch,
+	"wap":   DisplayWAP,
+}
+
 //AuthRequest according to:
 //https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
 //
 type AuthRequest struct {
-	Scopes       []string     `schema:"scope"`
+	Scopes       Scopes       `schema:"scope"`
 	ResponseType ResponseType `schema:"response_type"`
-	ClientID     string
-	RedirectURI  string //TODO: type
+	ClientID     string       `schema:"client_id"`
+	RedirectURI  string       `schema:"redirect_uri"` //TODO: type
 
-	State string
+	State string `schema:"state"`
 
 	// ResponseMode TODO: ?
 
-	Nonce       string
-	Display     Display
-	Prompt      Prompt
-	MaxAge      uint32
-	UILocales   []language.Tag
-	IDTokenHint string
-	LoginHint   string
-	ACRValues   []string
+	Nonce       string   `schema:"nonce"`
+	Display     Display  `schema:"display"`
+	Prompt      Prompt   `schema:"prompt"`
+	MaxAge      uint32   `schema:"max_age"`
+	UILocales   Locales  `schema:"ui_locales"`
+	IDTokenHint string   `schema:"id_token_hint"`
+	LoginHint   string   `schema:"login_hint"`
+	ACRValues   []string `schema:"acr_values"`
+}
+
+type Scopes []string
+
+func (s *Scopes) UnmarshalText(text []byte) error {
+	scopes := strings.Split(string(text), " ")
+	*s = Scopes(scopes)
+	return nil
 }
 
 type ResponseType string
 
 type Display string
 
+func (d *Display) UnmarshalText(text []byte) error {
+	var ok bool
+	display := string(text)
+	*d, ok = displayValues[display]
+	if !ok {
+		return errors.New("")
+	}
+	return nil
+}
+
 type Prompt string
+
+type Locales []language.Tag
+
+func (l *Locales) UnmarshalText(text []byte) error {
+	locales := strings.Split(string(text), " ")
+	for _, locale := range locales {
+		tag, err := language.Parse(locale)
+		if err == nil && !tag.IsRoot() {
+			*l = append(*l, tag)
+		}
+	}
+	return nil
+}
diff --git a/pkg/op/authrequest.go b/pkg/op/authrequest.go
index d631992..9a53238 100644
--- a/pkg/op/authrequest.go
+++ b/pkg/op/authrequest.go
@@ -4,11 +4,24 @@ import (
 	"errors"
 	"net/http"
 
+	"github.com/gorilla/schema"
+
 	"github.com/caos/oidc/pkg/oidc"
 )
 
 func ParseAuthRequest(w http.ResponseWriter, r *http.Request) (*oidc.AuthRequest, error) {
-	return nil, errors.New("Unimplemented") //TODO: impl
+	err := r.ParseForm()
+	if err != nil {
+		return nil, errors.New("Unimplemented") //TODO: impl
+	}
+	authReq := new(oidc.AuthRequest)
+
+	//TODO:
+	d := schema.NewDecoder()
+	d.IgnoreUnknownKeys(true)
+
+	err = d.Decode(authReq, r.Form)
+	return authReq, err
 }
 
 func ValidateAuthRequest(authRequest *oidc.AuthRequest) error {
diff --git a/pkg/op/go.mod b/pkg/op/go.mod
index 04596fa..bb6297d 100644
--- a/pkg/op/go.mod
+++ b/pkg/op/go.mod
@@ -14,5 +14,6 @@ require (
 	github.com/caos/oidc/pkg/utils v0.0.0-00010101000000-000000000000
 	github.com/caos/utils/logging v0.0.0-20191104132131-b318678afbef
 	github.com/gorilla/mux v1.7.3
+	github.com/gorilla/schema v1.1.0
 	github.com/stretchr/testify v1.4.0
 )
diff --git a/pkg/utils/formParser.go b/pkg/utils/formParser.go
new file mode 100644
index 0000000..d4b585b
--- /dev/null
+++ b/pkg/utils/formParser.go
@@ -0,0 +1 @@
+package utils