fix(server): revert the state & code_challenge validation

server/handlers/authorize.go

@@ -64,7 +64,7 @@ func AuthorizeHandler() gin.HandlerFunc {
 
 		if err := validateAuthorizeRequest(responseType, responseMode, clientID, state, codeChallenge); err != nil {
 			log.Debug("invalid authorization request: ", err)
-			gc.JSON(http.StatusBadRequest, gin.H{"error": err})
+			gc.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 			return
 		}
 
@@ -80,18 +80,39 @@ func AuthorizeHandler() gin.HandlerFunc {
 		// used for response mode query or fragment
 		loginState := "state=" + state + "&scope=" + strings.Join(scope, " ") + "&redirect_uri=" + redirectURI
 		loginURL := "/app?" + loginState
+
 		if responseMode == constants.ResponseModeFragment {
 			loginURL = "/app#" + loginState
 		}
 
+		if state == "" {
+			handleResponse(gc, responseMode, loginURL, redirectURI, map[string]interface{}{
+				"type": "authorization_response",
+				"response": map[string]interface{}{
+					"error":             "state_required",
+					"error_description": "state is required",
+				},
+			}, http.StatusOK)
+			return
+		}
+
+		if responseType == constants.ResponseTypeCode && codeChallenge == "" {
+			handleResponse(gc, responseMode, loginURL, redirectURI, map[string]interface{}{
+				"type": "authorization_response",
+				"response": map[string]interface{}{
+					"error":             "code_challenge_required",
+					"error_description": "code challenge is required",
+				},
+			}, http.StatusOK)
+		}
+
 		loginError := map[string]interface{}{
 			"type": "authorization_response",
-			"response": map[string]string{
+			"response": map[string]interface{}{
 				"error":             "login_required",
 				"error_description": "Login is required",
 			},
 		}
-
 		sessionToken, err := cookie.GetSession(gc)
 		if err != nil {
 			log.Debug("GetSession failed: ", err)
@@ -113,7 +134,7 @@ func AuthorizeHandler() gin.HandlerFunc {
 			log.Debug("GetUserByID failed: ", err)
 			handleResponse(gc, responseMode, loginURL, redirectURI, map[string]interface{}{
 				"type": "authorization_response",
-				"response": map[string]string{
+				"response": map[string]interface{}{
 					"error":             "signup_required",
 					"error_description": "Sign up required",
 				},
@@ -181,7 +202,7 @@ func AuthorizeHandler() gin.HandlerFunc {
 
 			handleResponse(gc, responseMode, loginURL, redirectURI, map[string]interface{}{
 				"type": "authorization_response",
-				"response": map[string]string{
+				"response": map[string]interface{}{
 					"code":  code,
 					"state": state,
 				},
@@ -270,24 +291,16 @@ func validateAuthorizeRequest(responseType, responseMode, clientID, state, codeC
 		return fmt.Errorf("invalid response mode %s. 'query', 'fragment', 'form_post' and 'web_message' are valid response_mode", responseMode)
 	}
 
-	if responseType == constants.ResponseTypeCode && strings.TrimSpace(codeChallenge) == "" {
-		return fmt.Errorf("code_challenge is required for %s '%s'", responseType, constants.ResponseTypeCode)
-	}
-
 	if client, err := memorystore.Provider.GetStringStoreEnvVariable(constants.EnvKeyClientID); client != clientID || err != nil {
 		return fmt.Errorf("invalid client_id %s", clientID)
 	}
 
-	if strings.TrimSpace(state) == "" {
-		return fmt.Errorf("state is required")
-	}
-
 	return nil
 }
 
 func handleResponse(gc *gin.Context, responseMode, loginURI, redirectURI string, data map[string]interface{}, httpStatusCode int) {
 	isAuthenticationRequired := false
-	if _, ok := data["response"].(map[string]string)["error"]; ok {
+	if _, ok := data["response"].(map[string]interface{})["error"]; ok {
 		isAuthenticationRequired = true
 	}
 
@@ -308,7 +321,7 @@ func handleResponse(gc *gin.Context, responseMode, loginURI, redirectURI string,
 	case constants.ResponseModeFormPost:
 		gc.HTML(httpStatusCode, authorizeFormPostTemplate, gin.H{
 			"target_origin":          redirectURI,
-			"authorization_response": data,
+			"authorization_response": data["response"],
 		})
 		return
 	}

templates/authorize_form_post.tmpl

@@ -4,9 +4,9 @@
 		<title>Authorization Response</title>
 	</head>
 	<body onload="document.forms['authorize_form_post'].submit()">
-        <form action={{.target_origin}} name="authorize_form_post">
+        <form action="{{.target_origin}}" name="authorize_form_post" method="POST">
             {{ range $key, $val := .authorization_response }}
-                <input type="hidden" key={{$key}} value={{$val}} name={{$key}} id={{$key}} />
+                <input type="hidden" key="{{$key}}" value="{{$val}}" name="{{$key}}" id="{{$key}}" />
             {{ end }}
         </form>
 	</body>