Disable Oauth check if oauth disabled (#32368)

Fix #32367

---------

Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit 840ad7eefe2b49ab453b9a89b153a264a8c9f8a2)

Conflicts:
	services/auth/oauth2.go
  trivial context conflict

routers/web/web.go

@@ -327,6 +327,13 @@ func registerRoutes(m *web.Route) {
 		}
 	}
 
+	oauth2Enabled := func(ctx *context.Context) {
+		if !setting.OAuth2.Enabled {
+			ctx.Error(http.StatusForbidden)
+			return
+		}
+	}
+
 	reqMilestonesDashboardPageEnabled := func(ctx *context.Context) {
 		if !setting.Service.ShowMilestonesDashboardPage {
 			ctx.Error(http.StatusForbidden)
@@ -516,16 +523,18 @@ func registerRoutes(m *web.Route) {
 	m.Any("/user/events", routing.MarkLongPolling, events.Events)
 
 	m.Group("/login/oauth", func() {
+		m.Group("", func() {
 			m.Get("/authorize", web.Bind(forms.AuthorizationForm{}), auth.AuthorizeOAuth)
 			m.Post("/grant", web.Bind(forms.GrantApplicationForm{}), auth.GrantApplicationOAuth)
 			// TODO manage redirection
 			m.Post("/authorize", web.Bind(forms.AuthorizationForm{}), auth.AuthorizeOAuth)
 		}, ignSignInAndCsrf, reqSignIn)
 
-	m.Methods("GET, OPTIONS", "/login/oauth/userinfo", optionsCorsHandler(), ignSignInAndCsrf, auth.InfoOAuth)
+		m.Methods("GET, OPTIONS", "/userinfo", optionsCorsHandler(), ignSignInAndCsrf, auth.InfoOAuth)
-	m.Methods("POST, OPTIONS", "/login/oauth/access_token", optionsCorsHandler(), web.Bind(forms.AccessTokenForm{}), ignSignInAndCsrf, auth.AccessTokenOAuth)
+		m.Methods("POST, OPTIONS", "/access_token", optionsCorsHandler(), web.Bind(forms.AccessTokenForm{}), ignSignInAndCsrf, auth.AccessTokenOAuth)
-	m.Methods("GET, OPTIONS", "/login/oauth/keys", optionsCorsHandler(), ignSignInAndCsrf, auth.OIDCKeys)
+		m.Methods("GET, OPTIONS", "/keys", optionsCorsHandler(), ignSignInAndCsrf, auth.OIDCKeys)
-	m.Methods("POST, OPTIONS", "/login/oauth/introspect", optionsCorsHandler(), web.Bind(forms.IntrospectTokenForm{}), ignSignInAndCsrf, auth.IntrospectOAuth)
+		m.Methods("POST, OPTIONS", "/introspect", optionsCorsHandler(), web.Bind(forms.IntrospectTokenForm{}), ignSignInAndCsrf, auth.IntrospectOAuth)
+	}, oauth2Enabled)
 
 	m.Group("/user/settings", func() {
 		m.Get("", user_setting.Profile)
@@ -567,17 +576,24 @@ func registerRoutes(m *web.Route) {
 			}, openIDSignInEnabled)
 			m.Post("/account_link", linkAccountEnabled, security.DeleteAccountLink)
 		})
-		m.Group("/applications/oauth2", func() {
+
+		m.Group("/applications", func() {
+			// oauth2 applications
+			m.Group("/oauth2", func() {
 				m.Get("/{id}", user_setting.OAuth2ApplicationShow)
 				m.Post("/{id}", web.Bind(forms.EditOAuth2ApplicationForm{}), user_setting.OAuthApplicationsEdit)
 				m.Post("/{id}/regenerate_secret", user_setting.OAuthApplicationsRegenerateSecret)
 				m.Post("", web.Bind(forms.EditOAuth2ApplicationForm{}), user_setting.OAuthApplicationsPost)
 				m.Post("/{id}/delete", user_setting.DeleteOAuth2Application)
 				m.Post("/{id}/revoke/{grantId}", user_setting.RevokeOAuth2Grant)
-		})
+			}, oauth2Enabled)
-		m.Combo("/applications").Get(user_setting.Applications).
+
+			// access token applications
+			m.Combo("").Get(user_setting.Applications).
 				Post(web.Bind(forms.NewAccessTokenForm{}), user_setting.ApplicationsPost)
-		m.Post("/applications/delete", user_setting.DeleteApplication)
+			m.Post("/delete", user_setting.DeleteApplication)
+		})
+
 		m.Combo("/keys").Get(user_setting.Keys).
 			Post(web.Bind(forms.AddKeyForm{}), user_setting.KeysPost)
 		m.Post("/keys/delete", user_setting.DeleteKey)
@@ -755,12 +771,7 @@ func registerRoutes(m *web.Route) {
 				m.Post("/regenerate_secret", admin.ApplicationsRegenerateSecret)
 				m.Post("/delete", admin.DeleteApplication)
 			})
-		}, func(ctx *context.Context) {
+		}, oauth2Enabled)
-			if !setting.OAuth2.Enabled {
-				ctx.Error(http.StatusForbidden)
-				return
-			}
-		})
 
 		m.Group("/actions", func() {
 			m.Get("", admin.RedirectToDefaultSetting)
@@ -883,12 +894,7 @@ func registerRoutes(m *web.Route) {
 						m.Post("/regenerate_secret", org.OAuthApplicationsRegenerateSecret)
 						m.Post("/delete", org.DeleteOAuth2Application)
 					})
-				}, func(ctx *context.Context) {
+				}, oauth2Enabled)
-					if !setting.OAuth2.Enabled {
-						ctx.Error(http.StatusForbidden)
-						return
-					}
-				})
 
 				m.Group("/hooks", func() {
 					m.Get("", org.Webhooks)

services/auth/oauth2.go

@@ -68,6 +68,9 @@ func grantAdditionalScopes(grantScopes string) string {
 // CheckOAuthAccessToken returns uid of user from oauth token
 // + non default openid scopes requested
 func CheckOAuthAccessToken(ctx context.Context, accessToken string) (int64, string) {
+	if !setting.OAuth2.Enabled {
+		return 0, ""
+	}
 	// JWT tokens require a "."
 	if !strings.Contains(accessToken, ".") {
 		return 0, ""