Enable clear/purge for failed digests

golden/res/imp/failures-sk.html

 <!-- The <failures-list-sk> custom element declaration.
 
   The failures-list-sk custom element renders the list of digests that could
   not be downloaded or decoded.
 
   Attributes: None
 
   Events: None
 
   Methods: None
@@ skipping 36 matching lines @@
           <td class="reasonHeader">Reason</td>
           <td>&nbsp;</td>
           <td>&nbsp;</td>
         </tr>
 
         <template repeat="{{entry in failureEntries}}">
           <tr>
             <td class="dateTimeValue">{{entry.ts | _toLocalDate}}</td>
             <td class="digestValue"><a href="/img/images/{{entry.digest}}.png" target="_blank">{{entry.digest}}</a></td>
             <td class="reasonValue">{{entry.reason}}</td>
-            <td><paper-button on-click="{{clearHandler}}" data-entryid="{{entry.id}}" title="Remove from server cache">Clear</paper-button></td>
-            <td><paper-button on-click="{{purgeHandler}}" data-entryid="{{entry.id}}" title="Remove from cache and Google storage">Purge</paper-button></td>
+            <td><paper-button on-click="{{clearHandler}}" data-digestid="{{entry.digest}}" title="Remove from server cache">Clear</paper-button></td>
+            <td><paper-button on-click="{{purgeHandler}}" data-digestid="{{entry.digest}}" title="Remove from cache and Google storage">Purge</paper-button></td>
           </tr>
         </template>
     </table>
     <error-toast-sk></error-toast-sk>
     <!-- TODO(stephana): Add paper-spinner element while content loads -->
 
   </template>
   <script>
     Polymer({
       ready: function() {
         this.page = {};
 
         // Set up the paging change handler and load the data.
         this._reload();
       },
 
       // Load or reload the listing.
       // TODO(stephana): _reload will be called after a clear/purge to refresh
-      // the list of failures. 
+      // the list of failures.
       _reload: function() {
         var URL = '_/failure';
         this._handleServerResponse(sk.get(URL));
       },
 
+      _clear: function(event, gsPurge) {
+        var URL = '_/failure/clear';
+        if (gsPurge) {
+          URL += "?purge=true"
+        }
+        var digests = [ event.target.dataset.digestid ];
+        this._handleServerResponse(sk.post(URL, JSON.stringify(digests)));
+      },
+
+      clearHandler: function(event) { this._clear(event, false); },
+      purgeHandler: function(event) { this._clear(event, true); },
+
       _handleServerResponse: function(promise) {
         promise.then(JSON.parse).then(function(json) {
           this.failureEntries = json.failures;
         }.bind(this)).catch(sk.errorMessage);
       },
 
       _toLocalDate: function(timeStampSec) {
         return (new Date(timeStampSec * 1000)).toLocaleString();
       }
     });
 
   </script>
 </polymer-element>