1 files changed, 308 insertions, 0 deletions
diff --git a/remote/components/Marionette.sys.mjs b/remote/components/Marionette.sys.mjs
new file mode 100644
index 0000000000..9be05dafae
--- /dev/null
+++ b/remote/components/Marionette.sys.mjs
@@ -0,0 +1,308 @@
+/* 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";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  Preferences: "resource://gre/modules/Preferences.sys.mjs",
+
+  Deferred: "chrome://remote/content/shared/Sync.sys.mjs",
+  EnvironmentPrefs: "chrome://remote/content/marionette/prefs.sys.mjs",
+  Log: "chrome://remote/content/shared/Log.sys.mjs",
+  MarionettePrefs: "chrome://remote/content/marionette/prefs.sys.mjs",
+  RecommendedPreferences:
+    "chrome://remote/content/shared/RecommendedPreferences.sys.mjs",
+  TCPListener: "chrome://remote/content/marionette/server.sys.mjs",
+});
+
+XPCOMUtils.defineLazyGetter(lazy, "logger", () =>
+  lazy.Log.get(lazy.Log.TYPES.MARIONETTE)
+);
+
+XPCOMUtils.defineLazyGetter(lazy, "textEncoder", () => new TextEncoder());
+
+const NOTIFY_LISTENING = "marionette-listening";
+
+// Complements -marionette flag for starting the Marionette server.
+// We also set this if Marionette is running in order to start the server
+// again after a Firefox restart.
+const ENV_ENABLED = "MOZ_MARIONETTE";
+
+// Besides starting based on existing prefs in a profile and a command
+// line flag, we also support inheriting prefs out of an env var, and to
+// start Marionette that way.
+//
+// This allows marionette prefs to persist when we do a restart into
+// a different profile in order to test things like Firefox refresh.
+// The environment variable itself, if present, is interpreted as a
+// JSON structure, with the keys mapping to preference names in the
+// "marionette." branch, and the values to the values of those prefs. So
+// something like {"port": 4444} would result in the marionette.port
+// pref being set to 4444.
+const ENV_PRESERVE_PREFS = "MOZ_MARIONETTE_PREF_STATE_ACROSS_RESTARTS";
+
+// Map of Marionette-specific preferences that should be set via
+// RecommendedPreferences.
+const RECOMMENDED_PREFS = new Map([
+  // Automatically unload beforeunload alerts
+  ["dom.disable_beforeunload", true],
+]);
+
+const isRemote =
+  Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT;
+
+class MarionetteParentProcess {
+  #browserStartupFinished;
+
+  constructor() {
+    this.server = null;
+    this._activePortPath;
+
+    this.classID = Components.ID("{786a1369-dca5-4adc-8486-33d23c88010a}");
+    this.helpInfo = "  --marionette       Enable remote control server.\n";
+
+    // Initially set the enabled state based on the environment variable.
+    this.enabled = Services.env.exists(ENV_ENABLED);
+
+    Services.ppmm.addMessageListener("Marionette:IsRunning", this);
+
+    this.#browserStartupFinished = lazy.Deferred();
+  }
+
+  /**
+   * A promise that resolves when the initial application window has been opened.
+   *
+   * @returns {Promise}
+   *     Promise that resolves when the initial application window is open.
+   */
+  get browserStartupFinished() {
+    return this.#browserStartupFinished.promise;
+  }
+
+  get enabled() {
+    return this._enabled;
+  }
+
+  set enabled(value) {
+    // Return early if Marionette is already marked as being enabled.
+    // There is also no possibility to disable Marionette once it got enabled.
+    if (this._enabled || !value) {
+      return;
+    }
+
+    this._enabled = value;
+    lazy.logger.info(`Marionette enabled`);
+  }
+
+  get running() {
+    return !!this.server && this.server.alive;
+  }
+
+  receiveMessage({ name }) {
+    switch (name) {
+      case "Marionette:IsRunning":
+        return this.running;
+
+      default:
+        lazy.logger.warn("Unknown IPC message to parent process: " + name);
+        return null;
+    }
+  }
+
+  handle(cmdLine) {
+    // `handle` is called too late in certain cases (eg safe mode, see comment
+    // above "command-line-startup"). So the marionette command line argument
+    // will always be processed in `observe`.
+    // However it still needs to be consumed by the command-line-handler API,
+    // to avoid issues on macos.
+    // TODO: remove after Bug 1724251 is fixed.
+    cmdLine.handleFlag("marionette", false);
+  }
+
+  async observe(subject, topic) {
+    if (this.enabled) {
+      lazy.logger.trace(`Received observer notification ${topic}`);
+    }
+
+    switch (topic) {
+      case "profile-after-change":
+        Services.obs.addObserver(this, "command-line-startup");
+        break;
+
+      // In safe mode the command line handlers are getting parsed after the
+      // safe mode dialog has been closed. To allow Marionette to start
+      // earlier, use the CLI startup observer notification for
+      // special-cased handlers, which gets fired before the dialog appears.
+      case "command-line-startup":
+        Services.obs.removeObserver(this, topic);
+
+        this.enabled = subject.handleFlag("marionette", false);
+
+        if (this.enabled) {
+          // Marionette needs to be initialized before any window is shown.
+          Services.obs.addObserver(this, "final-ui-startup");
+
+          // We want to suppress the modal dialog that's shown
+          // when starting up in safe-mode to enable testing.
+          if (Services.appinfo.inSafeMode) {
+            Services.obs.addObserver(this, "domwindowopened");
+          }
+
+          lazy.RecommendedPreferences.applyPreferences(RECOMMENDED_PREFS);
+
+          // Only set preferences to preserve in a new profile
+          // when Marionette is enabled.
+          for (let [pref, value] of lazy.EnvironmentPrefs.from(
+            ENV_PRESERVE_PREFS
+          )) {
+            lazy.Preferences.set(pref, value);
+          }
+        }
+        break;
+
+      case "domwindowopened":
+        Services.obs.removeObserver(this, topic);
+        this.suppressSafeModeDialog(subject);
+        break;
+
+      case "final-ui-startup":
+        Services.obs.removeObserver(this, topic);
+
+        Services.obs.addObserver(this, "browser-idle-startup-tasks-finished");
+        Services.obs.addObserver(this, "mail-idle-startup-tasks-finished");
+        Services.obs.addObserver(this, "quit-application");
+
+        await this.init();
+        break;
+
+      // Used to wait until the initial application window has been opened.
+      case "browser-idle-startup-tasks-finished":
+      case "mail-idle-startup-tasks-finished":
+        Services.obs.removeObserver(
+          this,
+          "browser-idle-startup-tasks-finished"
+        );
+        Services.obs.removeObserver(this, "mail-idle-startup-tasks-finished");
+        this.#browserStartupFinished.resolve();
+        break;
+
+      case "quit-application":
+        Services.obs.removeObserver(this, topic);
+        await this.uninit();
+        break;
+    }
+  }
+
+  suppressSafeModeDialog(win) {
+    win.addEventListener(
+      "load",
+      () => {
+        let dialog = win.document.getElementById("safeModeDialog");
+        if (dialog) {
+          // accept the dialog to start in safe-mode
+          lazy.logger.trace("Safe mode detected, supressing dialog");
+          win.setTimeout(() => {
+            dialog.getButton("accept").click();
+          });
+        }
+      },
+      { once: true }
+    );
+  }
+
+  async init() {
+    if (!this.enabled || this.running) {
+      lazy.logger.debug(
+        `Init aborted (enabled=${this.enabled}, running=${this.running})`
+      );
+      return;
+    }
+
+    try {
+      this.server = new lazy.TCPListener(lazy.MarionettePrefs.port);
+      this.server.start();
+    } catch (e) {
+      lazy.logger.fatal("Marionette server failed to start", e);
+      await this.uninit();
+      Services.startup.quit(Ci.nsIAppStartup.eForceQuit);
+      return;
+    }
+
+    Services.env.set(ENV_ENABLED, "1");
+    Services.obs.notifyObservers(this, NOTIFY_LISTENING, true);
+    lazy.logger.debug("Marionette is listening");
+
+    // Write Marionette port to MarionetteActivePort file within the profile.
+    this._activePortPath = PathUtils.join(
+      PathUtils.profileDir,
+      "MarionetteActivePort"
+    );
+
+    const data = `${this.server.port}`;
+    try {
+      await IOUtils.write(this._activePortPath, lazy.textEncoder.encode(data));
+    } catch (e) {
+      lazy.logger.warn(
+        `Failed to create ${this._activePortPath} (${e.message})`
+      );
+    }
+  }
+
+  async uninit() {
+    if (this.running) {
+      this.server.stop();
+      Services.obs.notifyObservers(this, NOTIFY_LISTENING);
+      lazy.logger.debug("Marionette stopped listening");
+
+      try {
+        await IOUtils.remove(this._activePortPath);
+      } catch (e) {
+        lazy.logger.warn(
+          `Failed to remove ${this._activePortPath} (${e.message})`
+        );
+      }
+    }
+  }
+
+  get QueryInterface() {
+    return ChromeUtils.generateQI([
+      "nsICommandLineHandler",
+      "nsIMarionette",
+      "nsIObserver",
+    ]);
+  }
+}
+
+class MarionetteContentProcess {
+  constructor() {
+    this.classID = Components.ID("{786a1369-dca5-4adc-8486-33d23c88010a}");
+  }
+
+  get running() {
+    let reply = Services.cpmm.sendSyncMessage("Marionette:IsRunning");
+    if (!reply.length) {
+      lazy.logger.warn("No reply from parent process");
+      return false;
+    }
+    return reply[0];
+  }
+
+  get QueryInterface() {
+    return ChromeUtils.generateQI(["nsIMarionette"]);
+  }
+}
+
+export var Marionette;
+if (isRemote) {
+  Marionette = new MarionetteContentProcess();
+} else {
+  Marionette = new MarionetteParentProcess();
+}
+
+// This is used by the XPCOM codepath which expects a constructor
+export const MarionetteFactory = function() {
+  return Marionette;
+};