config_service: change error message for error 403.

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

Index: appengine/config_service/ui/src/config-ui/config-set.html
diff --git a/appengine/config_service/ui/src/config-ui/config-set.html b/appengine/config_service/ui/src/config-ui/config-set.html
index 2b99e1288514be3795f07f9f873b03cd62ebdd4d..7ae346fc4eca63c93b068e577a238fb597da0d12 100644
--- a/appengine/config_service/ui/src/config-ui/config-set.html
+++ b/appengine/config_service/ui/src/config-ui/config-set.html
@@ -171,7 +171,6 @@
       is: "config-set",
 
       properties: {
-
         frontPageIsActive: {
           type: Boolean,
           observer: '_frontPageIsActive'
@@ -227,14 +226,16 @@
       _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;
       },
@@ -274,8 +275,13 @@
         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 {