1 files changed, 111 insertions, 0 deletions
diff --git a/browser/components/newtab/actors/ASRouterChild.sys.mjs b/browser/components/newtab/actors/ASRouterChild.sys.mjs
new file mode 100644
index 0000000000..bd2c030fab
--- /dev/null
+++ b/browser/components/newtab/actors/ASRouterChild.sys.mjs
@@ -0,0 +1,111 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import {
+  MESSAGE_TYPE_LIST,
+  MESSAGE_TYPE_HASH as msg,
+} from "resource://activity-stream/common/ActorConstants.sys.mjs";
+
+const VALID_TYPES = new Set(MESSAGE_TYPE_LIST);
+
+export class ASRouterChild extends JSWindowActorChild {
+  constructor() {
+    super();
+    this.observers = new Set();
+  }
+
+  didDestroy() {
+    this.observers.clear();
+  }
+
+  actorCreated() {
+    // NOTE: DOMDocElementInserted may be called multiple times per
+    // PWindowGlobal due to the initial about:blank document's window global
+    // being re-used.
+    const window = this.contentWindow;
+    Cu.exportFunction(this.asRouterMessage.bind(this), window, {
+      defineAs: "ASRouterMessage",
+    });
+    Cu.exportFunction(this.addParentListener.bind(this), window, {
+      defineAs: "ASRouterAddParentListener",
+    });
+    Cu.exportFunction(this.removeParentListener.bind(this), window, {
+      defineAs: "ASRouterRemoveParentListener",
+    });
+  }
+
+  handleEvent(event) {
+    // DOMDocElementCreated is only used to create the actor.
+  }
+
+  addParentListener(listener) {
+    this.observers.add(listener);
+  }
+
+  removeParentListener(listener) {
+    this.observers.delete(listener);
+  }
+
+  receiveMessage({ name, data }) {
+    switch (name) {
+      case "EnterSnippetsPreviewMode":
+      case "UpdateAdminState":
+      case "ClearProviders":
+      case "ClearMessages": {
+        this.observers.forEach(listener => {
+          let result = Cu.cloneInto(
+            {
+              type: name,
+              data,
+            },
+            this.contentWindow
+          );
+          listener(result);
+        });
+        break;
+      }
+    }
+  }
+
+  wrapPromise(promise) {
+    return new this.contentWindow.Promise((resolve, reject) =>
+      promise.then(resolve, reject)
+    );
+  }
+
+  sendQuery(aName, aData = null) {
+    return this.wrapPromise(
+      new Promise(resolve => {
+        super.sendQuery(aName, aData).then(result => {
+          resolve(Cu.cloneInto(result, this.contentWindow));
+        });
+      })
+    );
+  }
+
+  asRouterMessage({ type, data }) {
+    if (VALID_TYPES.has(type)) {
+      switch (type) {
+        case msg.DISABLE_PROVIDER:
+        case msg.ENABLE_PROVIDER:
+        case msg.EXPIRE_QUERY_CACHE:
+        case msg.FORCE_WHATSNEW_PANEL:
+        case msg.CLOSE_WHATSNEW_PANEL:
+        case msg.FORCE_PRIVATE_BROWSING_WINDOW:
+        case msg.IMPRESSION:
+        case msg.RESET_PROVIDER_PREF:
+        case msg.SET_PROVIDER_USER_PREF:
+        case msg.USER_ACTION: {
+          return this.sendAsyncMessage(type, data);
+        }
+        default: {
+          // these messages need a response
+          return this.sendQuery(type, data);
+        }
+      }
+    }
+    throw new Error(`Unexpected type "${type}"`);
+  }
+}