1 files changed, 104 insertions, 0 deletions
diff --git a/browser/actors/AboutNewTabChild.sys.mjs b/browser/actors/AboutNewTabChild.sys.mjs
new file mode 100644
index 0000000000..87e8a99135
--- /dev/null
+++ b/browser/actors/AboutNewTabChild.sys.mjs
@@ -0,0 +1,104 @@
+/* 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 { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+import { PrivateBrowsingUtils } from "resource://gre/modules/PrivateBrowsingUtils.sys.mjs";
+import { RemotePageChild } from "resource://gre/actors/RemotePageChild.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  NimbusFeatures: "resource://nimbus/ExperimentAPI.sys.mjs",
+});
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "ACTIVITY_STREAM_DEBUG",
+  "browser.newtabpage.activity-stream.debug",
+  false
+);
+
+let gNextPortID = 0;
+
+export class AboutNewTabChild extends RemotePageChild {
+  handleEvent(event) {
+    if (event.type == "DOMDocElementInserted") {
+      let portID = Services.appinfo.processID + ":" + ++gNextPortID;
+
+      this.sendAsyncMessage("Init", {
+        portID,
+        url: this.contentWindow.document.documentURI.replace(/[\#|\?].*$/, ""),
+      });
+    } else if (event.type == "load") {
+      this.sendAsyncMessage("Load");
+    } else if (event.type == "DOMContentLoaded") {
+      if (!this.contentWindow.document.body.firstElementChild) {
+        return; // about:newtab is a blank page
+      }
+
+      // If the separate about:welcome page is enabled, we can skip all of this,
+      // since that mode doesn't load any of the Activity Stream bits.
+      if (
+        (lazy.NimbusFeatures.aboutwelcome.getVariable("enabled") ?? true) &&
+        this.contentWindow.location.pathname.includes("welcome")
+      ) {
+        return;
+      }
+
+      const debug = !AppConstants.RELEASE_OR_BETA && lazy.ACTIVITY_STREAM_DEBUG;
+      const debugString = debug ? "-dev" : "";
+
+      // This list must match any similar ones in render-activity-stream-html.js.
+      const scripts = [
+        "chrome://browser/content/contentSearchUI.js",
+        "chrome://browser/content/contentSearchHandoffUI.js",
+        "chrome://browser/content/contentTheme.js",
+        `resource://activity-stream/vendor/react${debugString}.js`,
+        `resource://activity-stream/vendor/react-dom${debugString}.js`,
+        "resource://activity-stream/vendor/prop-types.js",
+        "resource://activity-stream/vendor/react-transition-group.js",
+        "resource://activity-stream/vendor/redux.js",
+        "resource://activity-stream/vendor/react-redux.js",
+        "resource://activity-stream/data/content/activity-stream.bundle.js",
+        "resource://activity-stream/data/content/newtab-render.js",
+      ];
+
+      for (let script of scripts) {
+        Services.scriptloader.loadSubScript(script, this.contentWindow);
+      }
+    } else if (event.type == "unload") {
+      try {
+        this.sendAsyncMessage("Unload");
+      } catch (e) {
+        // If the tab has been closed the frame message manager has already been
+        // destroyed
+      }
+    } else if (
+      (event.type == "pageshow" || event.type == "visibilitychange") &&
+      // The default browser notification shouldn't be shown on about:welcome
+      // since we don't want to distract from the onboarding wizard.
+      !this.contentWindow.location.pathname.includes("welcome")
+    ) {
+      // Don't show the notification in non-permanent private windows
+      // since it is expected to have very little opt-in here.
+      let contentWindowPrivate = PrivateBrowsingUtils.isContentWindowPrivate(
+        this.contentWindow
+      );
+      if (
+        this.document.visibilityState == "visible" &&
+        (!contentWindowPrivate ||
+          (contentWindowPrivate &&
+            PrivateBrowsingUtils.permanentPrivateBrowsing))
+      ) {
+        this.sendAsyncMessage("AboutNewTabVisible");
+
+        // Note: newtab feature info is currently being loaded in PrefsFeed.jsm,
+        // But we're recording exposure events here.
+        lazy.NimbusFeatures.newtab.recordExposureEvent({ once: true });
+      }
+    }
+  }
+}