config_service: change error message for error 403.

appengine/config_service/ui/src/config-ui/config-set.html

 <!--
   Copyright 2017 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 -->
 
 <link rel="import" href="config-file-card.html">
 <link rel="import" href="../../bower_components/iron-ajax/iron-ajax.html">
 <link rel="import" href="../../bower_components/iron-icons/iron-icons.html">
 <link rel="import" href="../../bower_components/paper-item/paper-item.html">
@@ skipping 153 matching lines @@
       <div class="center">
         <p>[[errorMessage]]</p>
       </div>
     </template>
   </template>
   <script>
     Polymer({
       is: "config-set",
 
       properties: {
-
         frontPageIsActive: {
           type: Boolean,
           observer: '_frontPageIsActive'
         },
 
         category: {
           type: String
         },
 
         files: {
@@ skipping 35 matching lines @@
 
       _forceRefresh: function() {
         this.refreshMessage = null;
         this.$.refreshConfigs.generateRequest();
         this.isRefreshing = true;
       },
 
       _frontPageIsActive: function() {
         if (this.frontPageIsActive === false) {
           this.isLoading = true;
-          this.$.requestConfigs.generateRequest();
+          if (!this.initialized) {
+            document.addEventListener('fetch-configs', function() {
+              this.$.requestConfigs.generateRequest();
+            }.bind(this));
+          } else {
+            this.$.requestConfigs.generateRequest();
+          }
         }
       },
 
-      ready: function() {
-        this.isLoading = true;
-      },
-
       _isEmpty: function(list) {
         return list.length === 0;
       },
 
       _formatCategory: function(category) {
         if (category === "projects") return "Project";
         if (category === "services") return "Service";
       },
 
       _onCompleteRefresh: function() {
@@ skipping 19 matching lines @@
       _onRefreshError: function() {
         this.isRefreshing = false;
         this.refreshMessage = "Error: Files could not be refreshed.";
         this.fire('refreshError');
       },
 
       _onRequestError: function(event) {
         var error = parseInt(event.detail.error.message.match(/\d+/g));
         this.isLoading = false;
         if (error === 403) {
-          this.errorMessage = "Authorization required to view this config set. " +
-              "Please sign in.";
+          if (!this.auth_headers) {
+            this.errorMessage = "Access denied, please sign in.";
+          } else {
+            this.errorMessage = "Access denied, " + this.profile.email + 
+                " is not authorized to access this config set." + 
+                " Request access or sign in as a different user.";
+          }
         } else if (500 <= error && error < 600) {
           this.errorMessage = "Internal server error.";
         } else {
           this.errorMessage = "Error occured. Try again later.";
         }
         this.fire('fetchError');
       }
 
     });
   </script>
 </dom-module>