external editor support

app/assets/javascripts/app/frontend/models/app/editor.js

@@ -0,0 +1,30 @@
+class Editor extends Item {
+
+  constructor(json_obj) {
+    super(json_obj);
+  }
+
+  mapContentToLocalProperties(contentObject) {
+    super.mapContentToLocalProperties(contentObject)
+    this.url = contentObject.url;
+    this.name = contentObject.name;
+  }
+
+  structureParams() {
+    var params = {
+      url: this.url,
+      name: this.name
+    };
+
+    _.merge(params, super.structureParams());
+    return params;
+  }
+
+  toJSON() {
+    return {uuid: this.uuid}
+  }
+
+  get content_type() {
+    return "SN|Editor";
+  }
+}

app/assets/javascripts/app/frontend/models/local/itemParams.js

@@ -16,7 +16,7 @@ class ItemParams {
   }
 
   paramsForLocalStorage() {
-    this.additionalFields = ["updated_at", "dirty"];
+    this.additionalFields = ["updated_at", "dirty", "editorUrl"];
     this.forExportFile = true;
     return this.__params();
   }