Basic logout workflow

client.go

@@ -1,7 +1,10 @@
 package oidc
 
 import (
+	"bytes"
 	"net/http"
+	"net/url"
+	"strings"
 
 	"github.com/coreos/go-oidc"
 	"github.com/dchest/uniuri"
@@ -41,10 +44,30 @@ func (c *Client) Login(w http.ResponseWriter, r *http.Request) {
 		panic(errors.Wrap(err, "could not save session"))
 	}
 
-	http.Redirect(w, r, c.oauth2.AuthCodeURL(state), http.StatusFound)
+	authCodeOptions := []oauth2.AuthCodeOption{}
+
+	rawIDToken, _ := RawIDToken(w, r)
+	if rawIDToken != "" {
+		authCodeOptions = append(
+			authCodeOptions,
+			oauth2.SetAuthURLParam("id_token_hint", rawIDToken),
+		)
+	}
+
+	authCodeURL := c.oauth2.AuthCodeURL(
+		state,
+		authCodeOptions...,
+	)
+
+	http.Redirect(w, r, authCodeURL, http.StatusFound)
 }
 
-func (c *Client) Logout(w http.ResponseWriter, r *http.Request) {
+func (c *Client) Logout(w http.ResponseWriter, r *http.Request, postLogoutRedirectURL string) {
+	rawIDToken, err := RawIDToken(w, r)
+	if err != nil {
+		panic(errors.Wrap(err, "could not retrieve raw id token"))
+	}
+
 	ctn := container.Must(r.Context())
 
 	sess, err := session.Must(ctn).Get(w, r)
@@ -55,50 +78,102 @@ func (c *Client) Logout(w http.ResponseWriter, r *http.Request) {
 	state := uniuri.New()
 
 	sess.Set(SessionOIDCStateKey, state)
+	sess.Unset(SessionOIDCRawTokenKey)
+	sess.Unset(SessionOIDCTokenKey)
 
 	if err := sess.Save(w, r); err != nil {
 		panic(errors.Wrap(err, "could not save session"))
 	}
 
-	http.Redirect(w, r, c.oauth2.AuthCodeURL(state), http.StatusFound)
+	sessionEndURL, err := c.sessionEndURL(rawIDToken, state, postLogoutRedirectURL)
+	if err != nil {
+		panic(errors.Wrap(err, "could not retrieve session end url"))
+	}
+
+	if sessionEndURL != "" {
+		http.Redirect(w, r, sessionEndURL, http.StatusFound)
+	} else {
+		http.Redirect(w, r, postLogoutRedirectURL, http.StatusFound)
+	}
 }
 
-func (c *Client) Validate(w http.ResponseWriter, r *http.Request) (*oidc.IDToken, error) {
+func (c *Client) sessionEndURL(idTokenHint, state, postLogoutRedirectURL string) (string, error) {
+	sessionEndEndpoint := &struct {
+		URL string `json:"end_session_endpoint"`
+	}{}
+
+	if err := c.provider.Claims(&sessionEndEndpoint); err != nil {
+		return "", errors.Wrap(err, "could not unmarshal claims")
+	}
+
+	if sessionEndEndpoint.URL == "" {
+		return "", nil
+	}
+
+	var buf bytes.Buffer
+	buf.WriteString(sessionEndEndpoint.URL)
+
+	v := url.Values{}
+
+	if idTokenHint != "" {
+		v.Set("id_token_hint", idTokenHint)
+	}
+
+	if postLogoutRedirectURL != "" {
+		v.Set("post_logout_redirect_uri", postLogoutRedirectURL)
+	}
+
+	if state != "" {
+		v.Set("state", state)
+	}
+
+	if strings.Contains(sessionEndEndpoint.URL, "?") {
+		buf.WriteByte('&')
+	} else {
+		buf.WriteByte('?')
+	}
+
+	buf.WriteString(v.Encode())
+
+	return buf.String(), nil
+}
+
+func (c *Client) Validate(w http.ResponseWriter, r *http.Request) (*oidc.IDToken, string, error) {
 	ctx := r.Context()
 	ctn := container.Must(ctx)
 
 	sess, err := session.Must(ctn).Get(w, r)
 	if err != nil {
-		return nil, errors.Wrap(err, "could not retrieve session")
+		return nil, "", errors.Wrap(err, "could not retrieve session")
 	}
 
 	state, ok := sess.Get(SessionOIDCStateKey).(string)
 	if !ok {
-		return nil, errors.New("invalid state")
+		return nil, "", errors.New("invalid state")
 	}
 
 	if r.URL.Query().Get("state") != state {
-		return nil, errors.New("state mismatch")
+		return nil, "", errors.New("state mismatch")
 	}
 
 	code := r.URL.Query().Get("code")
 
 	token, err := c.oauth2.Exchange(ctx, code)
 	if err != nil {
-		return nil, errors.Wrap(err, "could not exchange token")
+		return nil, "", errors.Wrap(err, "could not exchange token")
 	}
 
 	rawIDToken, ok := token.Extra("id_token").(string)
 	if !ok {
-		return nil, errors.New("could not find id token")
+		return nil, "", errors.New("could not find id token")
 	}
 
 	idToken, err := c.verifier.Verify(ctx, rawIDToken)
 	if err != nil {
-		return nil, errors.Wrap(err, "could not verify id token")
+		return nil, "", errors.Wrap(err, "could not verify id token")
 	}
 
-	return idToken, nil
+	return idToken, rawIDToken, nil
 }
 
 func NewClient(opts ...OptionFunc) *Client {

cmd/server/template/blocks/header.html.tmpl

@@ -9,7 +9,11 @@
   </div>
   <div class="column">
     <div class="buttons is-right">
+      {{if .IDToken}}
       <a class="button" href="/logout">Logout</a>
+      {{else}}
+        <a class="button is-primary" href="/login">Login</a>
+      {{end}}
     </div>
   </div>
 </div>

cmd/server/template/layouts/home.html.tmpl

@@ -3,8 +3,6 @@
 <section class="home is-fullheight section">
   <div class="container">
     {{template "header" .}}
-    <h2 class="is-size-4">Jeton OpenID Connect</h2>
-    <pre>{{ .JSONIDToken }}</pre>
     {{template "footer" .}}
   </div>
 </section>

cmd/server/template/layouts/profile.html.tmpl

@@ -0,0 +1,12 @@
+{{define "title"}}Accueil{{end}}
+{{define "body"}}
+<section class="home is-fullheight section">
+  <div class="container">
+    {{template "header" .}}
+    <h2 class="is-size-4">Jeton OpenID Connect</h2>
+    <pre>{{ .JSONIDToken }}</pre>
+    {{template "footer" .}}
+  </div>
+</section>
+{{end}}
+{{template "base" .}}

go.sum

@@ -34,6 +34,7 @@ github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CL
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 h1:y5HC9v93H5EPKqaS1UYVg1uYah5Xf51mBfIoWehClUQ=
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964/go.mod h1:Xd9hchkHSWYkEqJwUGisez3G1QY8Ryz0sdWrLPMGjLk=
 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=
 github.com/dchest/uniuri v0.0.0-20200228104902-7aecb25e1fe5 h1:RAV05c0xOkJ3dZGS0JFybxFKZ2WMLabgx3uXnd7rpGs=
 github.com/dchest/uniuri v0.0.0-20200228104902-7aecb25e1fe5/go.mod h1:GgB8SF9nRG+GqaDtLcwJZsQFhcogVCJ79j4EdT0c2V4=

internal/route/home.go

@@ -0,0 +1,28 @@
+package route
+
+import (
+	"net/http"
+
+	oidc "forge.cadoles.com/wpetit/goweb-oidc"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/middleware/container"
+	"gitlab.com/wpetit/goweb/service/template"
+)
+
+func serveHomePage(w http.ResponseWriter, r *http.Request) {
+	ctn := container.Must(r.Context())
+	tmpl := template.Must(ctn)
+
+	idToken, _ := oidc.IDToken(w, r)
+
+	if idToken != nil {
+		http.Redirect(w, r, "/profile", http.StatusSeeOther)
+		return
+	}
+
+	data := extendTemplateData(w, r, template.Data{})
+
+	if err := tmpl.RenderPage(w, "home.html.tmpl", data); err != nil {
+		panic(errors.Wrapf(err, "could not render '%s' page", r.URL.Path))
+	}
+}

internal/route/login.go

@@ -1,41 +1,20 @@
 package route
 
 import (
-	"encoding/json"
 	"net/http"
 
 	oidc "forge.cadoles.com/wpetit/goweb-oidc"
-	"github.com/pkg/errors"
 	"gitlab.com/wpetit/goweb/logger"
 	"gitlab.com/wpetit/goweb/middleware/container"
-	"gitlab.com/wpetit/goweb/service/template"
 )
 
-func serveHomePage(w http.ResponseWriter, r *http.Request) {
+func handleLogin(w http.ResponseWriter, r *http.Request) {
 	ctn := container.Must(r.Context())
-	tmpl := template.Must(ctn)
+	client := oidc.Must(ctn)
-
+	client.Login(w, r)
-	idToken, err := oidc.IDToken(w, r)
-	if err != nil {
-		panic(errors.Wrap(err, "could not retrieve idToken"))
-	}
-
-	jsonIDToken, err := json.MarshalIndent(idToken, "", " ")
-	if err != nil {
-		panic(errors.Wrap(err, "could not encode idToken"))
-	}
-
-	data := extendTemplateData(w, r, template.Data{
-		"IDToken":     idToken,
-		"JSONIDToken": string(jsonIDToken),
-	})
-
-	if err := tmpl.RenderPage(w, "home.html.tmpl", data); err != nil {
-		panic(errors.Wrapf(err, "could not render '%s' page", r.URL.Path))
-	}
 }
 
-func handleLogin(w http.ResponseWriter, r *http.Request) {
+func handleLoginCallback(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 
 	idToken, err := oidc.IDToken(w, r)

internal/route/logout.go

@@ -23,5 +23,5 @@ func handleLogout(w http.ResponseWriter, r *http.Request) {
 
 	client := oidc.Must(ctn)
 
-	client.Logout(w, r)
+	client.Logout(w, r, "")
 }

internal/route/mount.go

@@ -9,14 +9,16 @@ import (
 )
 
 func Mount(r *chi.Mux, config *config.Config) error {
-	r.Group(func(r chi.Router) {
-		r.Use(oidc.Middleware)
 
+	r.With(oidc.HandleCallback).Get("/oauth2/callback", handleLoginCallback)
 	r.Get("/", serveHomePage)
-	})
-
-	r.With(oidc.HandleCallback).Get("/oauth2/callback", handleLogin)
 	r.Get("/logout", handleLogout)
+	r.Get("/login", handleLogin)
+
+	r.Route("/profile", func(r chi.Router) {
+		r.Use(oidc.Middleware)
+		r.Get("/", serveProfilePage)
+	})
 
 	notFoundHandler := r.NotFoundHandler()
 	r.Get("/*", static.Dir(config.HTTP.PublicDir, "", notFoundHandler))

internal/route/profile.go

@@ -0,0 +1,35 @@
+package route
+
+import (
+	"encoding/json"
+	"net/http"
+
+	oidc "forge.cadoles.com/wpetit/goweb-oidc"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/middleware/container"
+	"gitlab.com/wpetit/goweb/service/template"
+)
+
+func serveProfilePage(w http.ResponseWriter, r *http.Request) {
+	ctn := container.Must(r.Context())
+	tmpl := template.Must(ctn)
+
+	idToken, err := oidc.IDToken(w, r)
+	if err != nil {
+		panic(errors.Wrap(err, "could not retrieve idToken"))
+	}
+
+	jsonIDToken, err := json.MarshalIndent(idToken, "", " ")
+	if err != nil {
+		panic(errors.Wrap(err, "could not encode idToken"))
+	}
+
+	data := extendTemplateData(w, r, template.Data{
+		"IDToken":     idToken,
+		"JSONIDToken": string(jsonIDToken),
+	})
+
+	if err := tmpl.RenderPage(w, "profile.html.tmpl", data); err != nil {
+		panic(errors.Wrapf(err, "could not render '%s' page", r.URL.Path))
+	}
+}

middleware.go

@@ -14,6 +14,7 @@ import (
 
 const (
 	SessionOIDCTokenKey    = "oidc-token"
+	SessionOIDCRawTokenKey = "oidc-raw-token"
 	SessionOIDCStateKey    = "oidc-state"
 )
 
@@ -47,7 +48,7 @@ func HandleCallback(next http.Handler) http.Handler {
 		ctn := container.Must(ctx)
 		client := Must(ctn)
 
-		idToken, err := client.Validate(w, r)
+		idToken, rawIDToken, err := client.Validate(w, r)
 		if err != nil {
 			logger.Error(ctx, "could not validate oidc token", logger.E(err))
 
@@ -62,6 +63,7 @@ func HandleCallback(next http.Handler) http.Handler {
 		}
 
 		sess.Set(SessionOIDCTokenKey, idToken)
+		sess.Set(SessionOIDCRawTokenKey, rawIDToken)
 
 		if err := sess.Save(w, r); err != nil {
 			panic(errors.Wrap(err, "could not save session"))
@@ -73,14 +75,6 @@ func HandleCallback(next http.Handler) http.Handler {
 	return http.HandlerFunc(fn)
 }
 
-func Logout(w http.ResponseWriter, r *http.Request) {
-	// ctx := r.Context()
-	// ctn := container.Must(ctx)
-	// client := Must(ctn)
-
-	// client
-}
-
 func IDToken(w http.ResponseWriter, r *http.Request) (*oidc.IDToken, error) {
 	ctn := container.Must(r.Context())
 
@@ -96,3 +90,19 @@ func IDToken(w http.ResponseWriter, r *http.Request) (*oidc.IDToken, error) {
 
 	return idToken, nil
 }
+
+func RawIDToken(w http.ResponseWriter, r *http.Request) (string, error) {
+	ctn := container.Must(r.Context())
+
+	sess, err := session.Must(ctn).Get(w, r)
+	if err != nil {
+		return "", errors.Wrap(err, "could not retrieve session")
+	}
+
+	rawIDToken, ok := sess.Get(SessionOIDCRawTokenKey).(string)
+	if !ok || rawIDToken == "" {
+		return "", errors.New("invalid raw id token")
+	}
+
+	return rawIDToken, nil
+}

option.go

@@ -16,6 +16,12 @@ type Option struct {
 	Scopes       []string
 }
 
+func WithRedirectURL(url string) OptionFunc {
+	return func(opt *Option) {
+		opt.RedirectURL = url
+	}
+}
+
 func WithCredentials(clientID, clientSecret string) OptionFunc {
 	return func(opt *Option) {
 		opt.ClientID = clientID