config_service: make UI adjustable for mobile

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">
 <link rel="import" href="../../bower_components/paper-spinner/paper-spinner.html">
 <link rel="import" href="../../bower_components/polymer/polymer.html">
 <link rel="import" href="../../bower_components/iron-icons/maps-icons.html">
 <link rel="import" href="../../bower_components/paper-tooltip/paper-tooltip.html">
 
 <dom-module id="config-set">
   <template>
     <style>
-      .spinner {
-        text-align: center;
+      @media only screen and (min-width: 768px) {
+        .center {
+          width: 550px;
+        }
       }
 
       .category {
         font-size: 100%;
         font-family: sans-serif;
       }
 
+      .name {
+        font-size: 200%;
+        font-family: sans-serif;
+        word-wrap: break-word;
+      }
+
       .center {
-        width: 20%;
         margin: auto;
         text-align: left;
-      }
+      }    
 
       .config-card { 
         padding-bottom: 1%;
         animation: fadein 1.5s;
       }
 
       @keyframes fadein {
         from {opacity: 0}
         to {opacity: 1}
       }
 
-      .name {
-        font-size: 200%;
-        font-family: sans-serif;
-        word-wrap: break-word;
-      }
-
-      #refreshStatus { font-size: 80%; }
-
       .title {
         padding-bottom: 1%;
         padding-top: 5%;
       }
 
+      #refreshStatus { font-size: 80%; }
+
       .paper-green { color: var(--paper-green-600); }
 
       .paper-red { color: var(--paper-red-600); }
 
       .paper-grey { color: var(--paper-grey-600); }
+
+      .spinner {
+        text-align: center;
+      }
+
     </style>
 
     <iron-ajax
         auto
         id="requestConfigs"
         url="/_ah/api/config/v1/config-sets?config_set=[[category]]/[[name]][[route.path]]&include_files=true&include_last_import_attempt=true"
         handle-as="json"
+        on-error="_onRequestError"
         on-response="_onGotConfigFiles"
         headers="[[auth_headers]]">
     </iron-ajax>
 
     <iron-ajax
         id="refreshConfigs"
         url="/_ah/api/config/v1/reimport?config_set=[[category]]/[[name]][[route.path]]"
         method="POST"
         handle-as="json"
         on-error="_onRefreshError"
@@ skipping 38 matching lines @@
               Last import succeeded.
             </template>
           </template>
           <template is="dom-if" if="[[_not(lastImportAttempt)]]">
             Last import attempt info not available.
           </template>
         </template>
         <p id="refreshStatus">[[refreshMessage]]</p>
       </div>      
     </div>
-    <template is="dom-if" if="[[isRefreshing]]">
-      <div class="spinner">
-        <paper-spinner active></paper-spinner>
-      </div>
-    </template>
-    <template is="dom-if" if="[[_not(isRefreshing)]]">
-      <template is="dom-if" if="[[isLoading]]">
+    <template is="dom-if" if="[[_not(errorMessage)]]">
+      <template is="dom-if" if="[[isRefreshing]]">
         <div class="spinner">
           <paper-spinner active></paper-spinner>
         </div>
       </template>
-      <template is="dom-if" if="[[_not(isLoading)]]">
-        <template is="dom-if" if="[[_isEmpty(files)]]">
-          <div class="center" style="font-family: sans-serif;">
-            No config files found.
+      <template is="dom-if" if="[[_not(isRefreshing)]]">
+        <template is="dom-if" if="[[isLoading]]">
+          <div class="spinner">
+            <paper-spinner active></paper-spinner>
           </div>
         </template>
-        <template is="dom-if" if="[[_not(_isEmpty(files))]]">
-          <template is="dom-repeat" items="[[files]]" as="file">
-            <div class="center config-card">  
-              <config-file-card
-                  name="[[file.path]]" link="[[location]]/[[file.path]]">
-              </config-file-card>
+        <template is="dom-if" if="[[_not(isLoading)]]">
+          <template is="dom-if" if="[[_isEmpty(files)]]">
+            <div class="center" style="font-family: sans-serif;">
+              No config files found.
             </div>
           </template>
+          <template is="dom-if" if="[[_not(_isEmpty(files))]]">
+            <template is="dom-repeat" items="[[files]]" as="file">
+              <div class="center config-card">  
+                <config-file-card
+                    name="[[file.path]]" link="[[location]]/[[file.path]]">
+                </config-file-card>
+              </div>
+            </template>
+          </template>
         </template>
       </template>
     </template>
+    <template is="dom-if" if="[[errorMessage]]">
+      <div class="center">
+        <p>[[errorMessage]]</p>
+      </div>
+    </template>
   </template>
   <script>
     Polymer({
       is: "config-set",
 
       properties: {
 
         frontPageIsActive: {
           type: Boolean,
           observer: '_frontPageIsActive'
@@ skipping 25 matching lines @@
           type: String
         },
 
         name: {
           type: String
         },
 
         refreshMessage: {
           type: String,
           value: null
+        },
+
+        errorMessage: {
+          type: String,
+          value: null
         }
       },
 
       _forceRefresh: function() {
         this.refreshMessage = null;
         this.$.refreshConfigs.generateRequest();
         this.isRefreshing = true;
       },
 
       _frontPageIsActive: function() {
@@ skipping 25 matching lines @@
       _not: function(b) {
         return !b;
       },
 
       _onGotConfigFiles: function(event) {
         this.files = event.detail.response.config_sets[0].files || [];
         this.location = event.detail.response.config_sets[0].location;
         this.lastImportAttempt = 
             event.detail.response.config_sets[0].last_import_attempt || null;
         this.isLoading = false;
+        this.errorMessage = null;
         this.fire('processedConfigFiles');
       },
 
       _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. You " +
+              "need to sign in first.";
+        } else if (error >= 500 && error < 600) {
+          this.errorMessage = "Internal server error.";
+        } else {
+          this.errorMessage = "Error occured. Try again later.";
+        }
+        this.fire('fetchError');
       }
+
     });
   </script>
 </dom-module>