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-rw-r--r--toolkit/modules/HiddenFrame.sys.mjs119
1 files changed, 119 insertions, 0 deletions
diff --git a/toolkit/modules/HiddenFrame.sys.mjs b/toolkit/modules/HiddenFrame.sys.mjs
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+++ b/toolkit/modules/HiddenFrame.sys.mjs
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+/* 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/. */
+
+const XUL_PAGE = Services.io.newURI("chrome://global/content/win.xhtml");
+
+const gAllHiddenFrames = new Set();
+
+let cleanupRegistered = false;
+function ensureCleanupRegistered() {
+ if (!cleanupRegistered) {
+ cleanupRegistered = true;
+ Services.obs.addObserver(function () {
+ for (let hiddenFrame of gAllHiddenFrames) {
+ hiddenFrame.destroy();
+ }
+ }, "xpcom-shutdown");
+ }
+}
+
+/**
+ * An hidden frame object. It takes care of creating a windowless browser and
+ * passing the window containing a blank XUL <window> back.
+ */
+export function HiddenFrame() {}
+
+HiddenFrame.prototype = {
+ _frame: null,
+ _browser: null,
+ _listener: null,
+ _webProgress: null,
+ _deferred: null,
+
+ /**
+ * Gets the |contentWindow| of the hidden frame. Creates the frame if needed.
+ * @returns Promise Returns a promise which is resolved when the hidden frame has finished
+ * loading.
+ */
+ get() {
+ if (!this._deferred) {
+ this._deferred = Promise.withResolvers();
+ this._create();
+ }
+
+ return this._deferred.promise;
+ },
+
+ /**
+ * Fetch a sync ref to the window inside the frame (needed for the add-on SDK).
+ */
+ getWindow() {
+ this.get();
+ return this._browser.document.ownerGlobal;
+ },
+
+ destroy() {
+ if (this._browser) {
+ if (this._listener) {
+ this._webProgress.removeProgressListener(this._listener);
+ this._listener = null;
+ this._webProgress = null;
+ }
+ this._frame = null;
+ this._deferred = null;
+
+ gAllHiddenFrames.delete(this);
+ this._browser.close();
+ this._browser = null;
+ }
+ },
+
+ _create() {
+ ensureCleanupRegistered();
+ let chromeFlags = Ci.nsIWebBrowserChrome.CHROME_REMOTE_WINDOW;
+ if (Services.appinfo.fissionAutostart) {
+ chromeFlags |= Ci.nsIWebBrowserChrome.CHROME_FISSION_WINDOW;
+ }
+ this._browser = Services.appShell.createWindowlessBrowser(
+ true,
+ chromeFlags
+ );
+ this._browser.QueryInterface(Ci.nsIInterfaceRequestor);
+ gAllHiddenFrames.add(this);
+ this._webProgress = this._browser.getInterface(Ci.nsIWebProgress);
+ this._listener = {
+ QueryInterface: ChromeUtils.generateQI([
+ "nsIWebProgressListener",
+ "nsIWebProgressListener2",
+ "nsISupportsWeakReference",
+ ]),
+ };
+ this._listener.onStateChange = (wbp, request, stateFlags, status) => {
+ if (!request) {
+ return;
+ }
+ if (stateFlags & Ci.nsIWebProgressListener.STATE_STOP) {
+ this._webProgress.removeProgressListener(this._listener);
+ this._listener = null;
+ this._webProgress = null;
+ // Get the window reference via the document.
+ this._frame = this._browser.document.ownerGlobal;
+ this._deferred.resolve(this._frame);
+ }
+ };
+ this._webProgress.addProgressListener(
+ this._listener,
+ Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT
+ );
+ let docShell = this._browser.docShell;
+ let systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
+ docShell.createAboutBlankDocumentViewer(systemPrincipal, systemPrincipal);
+ let browsingContext = this._browser.browsingContext;
+ browsingContext.useGlobalHistory = false;
+ let loadURIOptions = {
+ triggeringPrincipal: systemPrincipal,
+ };
+ this._browser.loadURI(XUL_PAGE, loadURIOptions);
+ },
+};