1 files changed, 190 insertions, 0 deletions
diff --git a/services/sync/Weave.sys.mjs b/services/sync/Weave.sys.mjs
new file mode 100644
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+++ b/services/sync/Weave.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/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+const lazy = {};
+ChromeUtils.defineESModuleGetters(lazy, {
+  CLIENT_NOT_CONFIGURED: "resource://services-sync/constants.sys.mjs",
+  FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
+});
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "syncUsername",
+  "services.sync.username"
+);
+
+/**
+ * Sync's XPCOM service.
+ *
+ * It is named "Weave" for historical reasons.
+ *
+ * It's worth noting how Sync is lazily loaded. We register a timer that
+ * loads Sync a few seconds after app startup. This is so Sync does not
+ * adversely affect application start time.
+ *
+ * If Sync is not configured, no extra Sync code is loaded. If an
+ * external component (say the UI) needs to interact with Sync, it
+ * should use the promise-base function whenLoaded() - something like the
+ * following:
+ *
+ * // 1. Grab a handle to the Sync XPCOM service.
+ * let service = Cc["@mozilla.org/weave/service;1"]
+ *                 .getService(Components.interfaces.nsISupports)
+ *                 .wrappedJSObject;
+ *
+ * // 2. Use the .then method of the promise.
+ * service.whenLoaded().then(() => {
+ *   // You are free to interact with "Weave." objects.
+ *   return;
+ * });
+ *
+ * And that's it!  However, if you really want to avoid promises and do it
+ * old-school, then
+ *
+ * // 1. Get a reference to the service as done in (1) above.
+ *
+ * // 2. Check if the service has been initialized.
+ * if (service.ready) {
+ *   // You are free to interact with "Weave." objects.
+ *   return;
+ * }
+ *
+ * // 3. Install "ready" listener.
+ * Services.obs.addObserver(function onReady() {
+ *   Services.obs.removeObserver(onReady, "weave:service:ready");
+ *
+ *   // You are free to interact with "Weave." objects.
+ * }, "weave:service:ready", false);
+ *
+ * // 4. Trigger loading of Sync.
+ * service.ensureLoaded();
+ */
+export function WeaveService() {
+  this.wrappedJSObject = this;
+  this.ready = false;
+}
+
+WeaveService.prototype = {
+  classID: Components.ID("{74b89fb0-f200-4ae8-a3ec-dd164117f6de}"),
+
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIObserver",
+    "nsISupportsWeakReference",
+  ]),
+
+  get Weave() {
+    const { Weave } = ChromeUtils.importESModule(
+      "resource://services-sync/main.sys.mjs"
+    );
+    return Weave;
+  },
+
+  ensureLoaded() {
+    // Side-effect of accessing the service is that it is instantiated.
+    this.Weave.Service;
+  },
+
+  whenLoaded() {
+    if (this.ready) {
+      return Promise.resolve();
+    }
+    let onReadyPromise = new Promise(resolve => {
+      Services.obs.addObserver(function onReady() {
+        Services.obs.removeObserver(onReady, "weave:service:ready");
+        resolve();
+      }, "weave:service:ready");
+    });
+    this.ensureLoaded();
+    return onReadyPromise;
+  },
+
+  init() {
+    // Force Weave service to load if it hasn't triggered from overlays
+    this.timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    this.timer.initWithCallback(
+      {
+        notify: () => {
+          let isConfigured = false;
+          // We only load more if it looks like Sync is configured.
+          if (this.enabled) {
+            // We have an associated FxAccount. So, do a more thorough check.
+            // This will import a number of modules and thus increase memory
+            // accordingly. We could potentially copy code performed by
+            // this check into this file if our above code is yielding too
+            // many false positives.
+            var { Weave } = ChromeUtils.importESModule(
+              "resource://services-sync/main.sys.mjs"
+            );
+            isConfigured =
+              Weave.Status.checkSetup() != lazy.CLIENT_NOT_CONFIGURED;
+          }
+          if (isConfigured) {
+            this.ensureLoaded();
+          }
+        },
+      },
+      10000,
+      Ci.nsITimer.TYPE_ONE_SHOT
+    );
+  },
+
+  /**
+   * Whether Sync appears to be enabled.
+   *
+   * This returns true if we have an associated FxA account and Sync is enabled.
+   *
+   * It does *not* perform a robust check to see if the client is working.
+   * For that, you'll want to check Weave.Status.checkSetup().
+   */
+  get enabled() {
+    return (
+      !!lazy.syncUsername &&
+      Services.prefs.getBoolPref("identity.fxaccounts.enabled")
+    );
+  },
+};
+
+export function AboutWeaveLog() {}
+AboutWeaveLog.prototype = {
+  classID: Components.ID("{d28f8a0b-95da-48f4-b712-caf37097be41}"),
+
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIAboutModule",
+    "nsISupportsWeakReference",
+  ]),
+
+  getURIFlags(aURI) {
+    return 0;
+  },
+
+  newChannel(aURI, aLoadInfo) {
+    let dir = lazy.FileUtils.getDir("ProfD", ["weave", "logs"]);
+    try {
+      dir.create(Ci.nsIFile.DIRECTORY_TYPE, lazy.FileUtils.PERMS_DIRECTORY);
+    } catch (ex) {
+      if (ex.result != Cr.NS_ERROR_FILE_ALREADY_EXISTS) {
+        throw ex;
+      }
+      // Ignore the exception due to a directory that already exists.
+    }
+    let uri = Services.io.newFileURI(dir);
+    let channel = Services.io.newChannelFromURIWithLoadInfo(uri, aLoadInfo);
+
+    channel.originalURI = aURI;
+
+    // Ensure that the about page has the same privileges as a regular directory
+    // view. That way links to files can be opened. make sure we use the correct
+    // origin attributes when creating the principal for accessing the
+    // about:sync-log data.
+    let principal = Services.scriptSecurityManager.createContentPrincipal(
+      uri,
+      aLoadInfo.originAttributes
+    );
+
+    channel.owner = principal;
+    return channel;
+  },
+};