1 files changed, 144 insertions, 0 deletions
diff --git a/browser/components/preferences/fxaPairDevice.js b/browser/components/preferences/fxaPairDevice.js
new file mode 100644
index 0000000000..8f5c26734d
--- /dev/null
+++ b/browser/components/preferences/fxaPairDevice.js
@@ -0,0 +1,144 @@
+// 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 { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+const { FxAccounts } = ChromeUtils.importESModule(
+  "resource://gre/modules/FxAccounts.sys.mjs"
+);
+const { Weave } = ChromeUtils.importESModule(
+  "resource://services-sync/main.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  EventEmitter: "resource://gre/modules/EventEmitter.sys.mjs",
+  FxAccountsPairingFlow: "resource://gre/modules/FxAccountsPairing.sys.mjs",
+});
+
+const { require } = ChromeUtils.importESModule(
+  "resource://devtools/shared/loader/Loader.sys.mjs"
+);
+const QR = require("devtools/shared/qrcode/index");
+
+// This is only for "labor illusion", see
+// https://www.fastcompany.com/3061519/the-ux-secret-that-will-ruin-apps-for-you
+const MIN_PAIRING_LOADING_TIME_MS = 1000;
+
+/**
+ * Communication between FxAccountsPairingFlow and gFxaPairDeviceDialog
+ * is done using an emitter via the following messages:
+ * <- [view:SwitchToWebContent] - Notifies the view to navigate to a specific URL.
+ * <- [view:Error] - Notifies the view something went wrong during the pairing process.
+ * -> [view:Closed] - Notifies the pairing module the view was closed.
+ */
+var gFxaPairDeviceDialog = {
+  init() {
+    this._resetBackgroundQR();
+    // We let the modal show itself before eventually showing a primary-password dialog later.
+    Services.tm.dispatchToMainThread(() => this.startPairingFlow());
+  },
+
+  uninit() {
+    // When the modal closes we want to remove any query params
+    // To prevent refreshes/restores from reopening the dialog
+    const browser = window.docShell.chromeEventHandler;
+    browser.loadURI(Services.io.newURI("about:preferences#sync"), {
+      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+    });
+
+    this.teardownListeners();
+    this._emitter.emit("view:Closed");
+  },
+
+  async startPairingFlow() {
+    this._resetBackgroundQR();
+    document
+      .getElementById("qrWrapper")
+      .setAttribute("pairing-status", "loading");
+    this._emitter = new EventEmitter();
+    this.setupListeners();
+    try {
+      if (!Weave.Utils.ensureMPUnlocked()) {
+        throw new Error("Master-password locked.");
+      }
+      // To keep consistent with our accounts.firefox.com counterpart
+      // we restyle the parent dialog this is contained in
+      this._styleParentDialog();
+
+      const [, uri] = await Promise.all([
+        new Promise(res => setTimeout(res, MIN_PAIRING_LOADING_TIME_MS)),
+        FxAccountsPairingFlow.start({ emitter: this._emitter }),
+      ]);
+      const imgData = QR.encodeToDataURI(uri, "L");
+      document.getElementById(
+        "qrContainer"
+      ).style.backgroundImage = `url("${imgData.src}")`;
+      document
+        .getElementById("qrWrapper")
+        .setAttribute("pairing-status", "ready");
+    } catch (e) {
+      this.onError(e);
+    }
+  },
+
+  _styleParentDialog() {
+    // Since the dialog title is in the above document, we can't query the
+    // document in this level and need to go up one
+    let dialogParent = window.parent.document;
+
+    // To allow the firefox icon to go over the dialog
+    let dialogBox = dialogParent.querySelector(".dialogBox");
+    dialogBox.style.overflow = "visible";
+    dialogBox.style.borderRadius = "12px";
+
+    let dialogTitle = dialogParent.querySelector(".dialogTitleBar");
+    dialogTitle.style.borderBottom = "none";
+    dialogTitle.classList.add("fxaPairDeviceIcon");
+  },
+
+  _resetBackgroundQR() {
+    // The text we encode doesn't really matter as it is un-scannable (blurry and very transparent).
+    const imgData = QR.encodeToDataURI(
+      "https://accounts.firefox.com/pair",
+      "L"
+    );
+    document.getElementById(
+      "qrContainer"
+    ).style.backgroundImage = `url("${imgData.src}")`;
+  },
+
+  onError(err) {
+    console.error(err);
+    this.teardownListeners();
+    document
+      .getElementById("qrWrapper")
+      .setAttribute("pairing-status", "error");
+  },
+
+  _switchToUrl(url) {
+    const browser = window.docShell.chromeEventHandler;
+    browser.fixupAndLoadURIString(url, {
+      triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal(
+        {}
+      ),
+    });
+  },
+
+  setupListeners() {
+    this._switchToWebContent = (_, url) => this._switchToUrl(url);
+    this._onError = (_, error) => this.onError(error);
+    this._emitter.once("view:SwitchToWebContent", this._switchToWebContent);
+    this._emitter.on("view:Error", this._onError);
+  },
+
+  teardownListeners() {
+    try {
+      this._emitter.off("view:SwitchToWebContent", this._switchToWebContent);
+      this._emitter.off("view:Error", this._onError);
+    } catch (e) {
+      console.warn("Error while tearing down listeners.", e);
+    }
+  },
+};