load ext in context of item

app/assets/javascripts/app/services/directives/contextualExtensionsMenu.js

@@ -10,7 +10,21 @@ class ContextualExtensionsMenu {
 
   controller($scope, modelManager, extensionManager) {
     'ngInject';
-    $scope.extensions = extensionManager.extensionsInContextOfItem($scope.item);
+
+    $scope.extensions = _.map(extensionManager.extensionsInContextOfItem($scope.item), function(ext){
+      return _.cloneDeep(ext);
+    });
+    
+    for(var ext of $scope.extensions) {
+      ext.loading = true;
+      extensionManager.loadExtensionInContextOfItem(ext, $scope.item, function(scopedExtension) {
+        ext.loading = false;
+        if(scopedExtension) {
+          _.merge(ext, scopedExtension);
+          ext.actions = scopedExtension.actions;
+        }
+      })
+    }
 
     $scope.executeAction = function(action, extension) {
       action.running = true;

app/assets/javascripts/app/services/extensionManager.js

@@ -71,6 +71,25 @@ class ExtensionManager {
     this.apiController.sync(null);
   }
 
+  /*
+  Loads an extension in the context of a certain item. The server then has the chance to respond with actions that are
+  relevant just to this item. The response extension is not saved, just displayed as a one-time thing.
+  */
+  loadExtensionInContextOfItem(extension, item, callback) {
+    this.Restangular.oneUrl(extension.url, extension.url).customGET("", {content_type: item.content_type, item_uuid: item.uuid}).then(function(response){
+      var scopedExtension = new Extension(response.plain());
+      scopedExtension.url = extension.url;
+      callback(scopedExtension);
+    }.bind(this))
+    .catch(function(response){
+      console.log("Error reloading extension", response);
+      callback(null);
+    })
+  }
+
+  /*
+  Registers new extension and saves it to user's account
+  */
   retrieveExtensionFromServer(url, callback) {
     this.Restangular.oneUrl(url, url).get().then(function(response){
       var ext = this.handleExtensionLoadExternalResponseItem(url, response.plain());