1 files changed, 108 insertions, 0 deletions
diff --git a/dom/ipc/manifestMessages.js b/dom/ipc/manifestMessages.js
new file mode 100644
index 000000000..c6bb40494
--- /dev/null
+++ b/dom/ipc/manifestMessages.js
@@ -0,0 +1,108 @@
+/* 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/.*/
+/*
+ * Manifest obtainer frame script implementation of:
+ * http://www.w3.org/TR/appmanifest/#obtaining
+ *
+ * It searches a top-level browsing context for
+ * a <link rel=manifest> element. Then fetches
+ * and processes the linked manifest.
+ *
+ * BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410
+ */
+/*globals Task, ManifestObtainer, ManifestFinder, content, sendAsyncMessage, addMessageListener, Components*/
+"use strict";
+const {
+  utils: Cu,
+} = Components;
+Cu.import("resource://gre/modules/ManifestObtainer.jsm");
+Cu.import("resource://gre/modules/ManifestFinder.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+
+const MessageHandler = {
+  registerListeners() {
+    addMessageListener(
+      "DOM:WebManifest:hasManifestLink",
+      this.hasManifestLink.bind(this)
+    );
+    addMessageListener(
+      "DOM:ManifestObtainer:Obtain",
+      this.obtainManifest.bind(this)
+    );
+    addMessageListener(
+      "DOM:Manifest:FireAppInstalledEvent",
+      this.fireAppInstalledEvent.bind(this)
+    );
+  },
+
+  /**
+   * Check if the content document includes a link to a web manifest.
+   * @param {Object} aMsg The IPC message, which is destructured to just
+   *                      get the id.
+   */
+  hasManifestLink({data: {id}}) {
+    const response = makeMsgResponse(id);
+    response.result = ManifestFinder.contentHasManifestLink(content);
+    response.success = true;
+    sendAsyncMessage("DOM:WebManifest:hasManifestLink", response);
+  },
+
+  /**
+   * Asynchronously obtains a web manifest from content by using the
+   * ManifestObtainer and messages back the result.
+   * @param {Object} aMsg The IPC message, which is destructured to just
+   *                      get the id.
+   */
+  obtainManifest: Task.async(function* ({data: {id}}) {
+    const response = makeMsgResponse(id);
+    try {
+      response.result = yield ManifestObtainer.contentObtainManifest(content);
+      response.success = true;
+    } catch (err) {
+      response.result = serializeError(err);
+    }
+    sendAsyncMessage("DOM:ManifestObtainer:Obtain", response);
+  }),
+
+  fireAppInstalledEvent({data: {id}}){
+    const ev = new Event("appinstalled");
+    const response = makeMsgResponse(id);
+    if (!content || content.top !== content) {
+      const msg = "Can only dispatch install event on top-level browsing contexts.";
+      response.result = serializeError(new Error(msg));
+    } else {
+      response.success = true;
+      content.dispatchEvent(ev);
+    }
+    sendAsyncMessage("DOM:Manifest:FireAppInstalledEvent", response);
+  }
+};
+/**
+ * Utility function to Serializes an JS Error, so it can be transferred over
+ * the message channel.
+ * FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586
+ * @param  {Error} aError The error to serialize.
+ * @return {Object} The serialized object.
+ */
+function serializeError(aError) {
+  const clone = {
+    "fileName": aError.fileName,
+    "lineNumber": aError.lineNumber,
+    "columnNumber": aError.columnNumber,
+    "stack": aError.stack,
+    "message": aError.message,
+    "name": aError.name
+  };
+  return clone;
+}
+
+function makeMsgResponse(aId) {
+    return {
+      id: aId,
+      success: false,
+      result: undefined
+    };
+  }
+
+MessageHandler.registerListeners();