1 files changed, 577 insertions, 0 deletions
diff --git a/browser/components/extensions/parent/ext-chrome-settings-overrides.js b/browser/components/extensions/parent/ext-chrome-settings-overrides.js
new file mode 100644
index 0000000000..6c9b35d66c
--- /dev/null
+++ b/browser/components/extensions/parent/ext-chrome-settings-overrides.js
@@ -0,0 +1,577 @@
+/* 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/. */
+
+"use strict";
+
+var { ExtensionPreferencesManager } = ChromeUtils.importESModule(
+  "resource://gre/modules/ExtensionPreferencesManager.sys.mjs"
+);
+var { ExtensionParent } = ChromeUtils.importESModule(
+  "resource://gre/modules/ExtensionParent.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  ExtensionControlledPopup:
+    "resource:///modules/ExtensionControlledPopup.sys.mjs",
+  ExtensionPermissions: "resource://gre/modules/ExtensionPermissions.sys.mjs",
+  ExtensionSettingsStore:
+    "resource://gre/modules/ExtensionSettingsStore.sys.mjs",
+});
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "HomePage",
+  "resource:///modules/HomePage.jsm"
+);
+
+const DEFAULT_SEARCH_STORE_TYPE = "default_search";
+const DEFAULT_SEARCH_SETTING_NAME = "defaultSearch";
+
+const HOMEPAGE_PREF = "browser.startup.homepage";
+const HOMEPAGE_PRIVATE_ALLOWED =
+  "browser.startup.homepage_override.privateAllowed";
+const HOMEPAGE_EXTENSION_CONTROLLED =
+  "browser.startup.homepage_override.extensionControlled";
+const HOMEPAGE_CONFIRMED_TYPE = "homepageNotification";
+const HOMEPAGE_SETTING_TYPE = "prefs";
+const HOMEPAGE_SETTING_NAME = "homepage_override";
+
+XPCOMUtils.defineLazyGetter(this, "homepagePopup", () => {
+  return new ExtensionControlledPopup({
+    confirmedType: HOMEPAGE_CONFIRMED_TYPE,
+    observerTopic: "browser-open-homepage-start",
+    popupnotificationId: "extension-homepage-notification",
+    settingType: HOMEPAGE_SETTING_TYPE,
+    settingKey: HOMEPAGE_SETTING_NAME,
+    descriptionId: "extension-homepage-notification-description",
+    descriptionMessageId: "homepageControlled.message",
+    learnMoreMessageId: "homepageControlled.learnMore",
+    learnMoreLink: "extension-home",
+    preferencesLocation: "home-homeOverride",
+    preferencesEntrypoint: "addon-manage-home-override",
+    async beforeDisableAddon(popup, win) {
+      // Disabling an add-on should remove the tabs that it has open, but we want
+      // to open the new homepage in this tab (which might get closed).
+      //   1. Replace the tab's URL with about:blank, wait for it to change
+      //   2. Now that this tab isn't associated with the add-on, disable the add-on
+      //   3. Trigger the browser's homepage method
+      let gBrowser = win.gBrowser;
+      let tab = gBrowser.selectedTab;
+      await replaceUrlInTab(gBrowser, tab, Services.io.newURI("about:blank"));
+      Services.prefs.addObserver(HOMEPAGE_PREF, async function prefObserver() {
+        Services.prefs.removeObserver(HOMEPAGE_PREF, prefObserver);
+        let loaded = waitForTabLoaded(tab);
+        win.BrowserHome();
+        await loaded;
+        // Manually trigger an event in case this is controlled again.
+        popup.open();
+      });
+    },
+  });
+});
+
+// When the browser starts up it will trigger the observer topic we're expecting
+// but that happens before our observer has been registered. To handle the
+// startup case we need to check if the preferences are set to load the homepage
+// and check if the homepage is active, then show the doorhanger in that case.
+async function handleInitialHomepagePopup(extensionId, homepageUrl) {
+  // browser.startup.page == 1 is show homepage.
+  if (
+    Services.prefs.getIntPref("browser.startup.page") == 1 &&
+    windowTracker.topWindow
+  ) {
+    let { gBrowser } = windowTracker.topWindow;
+    let tab = gBrowser.selectedTab;
+    let currentUrl = gBrowser.currentURI.spec;
+    // When the first window is still loading the URL might be about:blank.
+    // Wait for that the actual page to load before checking the URL, unless
+    // the homepage is set to about:blank.
+    if (currentUrl != homepageUrl && currentUrl == "about:blank") {
+      await waitForTabLoaded(tab);
+      currentUrl = gBrowser.currentURI.spec;
+    }
+    // Once the page has loaded, if necessary and the active tab hasn't changed,
+    // then show the popup now.
+    if (currentUrl == homepageUrl && gBrowser.selectedTab == tab) {
+      homepagePopup.open();
+      return;
+    }
+  }
+  homepagePopup.addObserver(extensionId);
+}
+
+/**
+ * Handles the homepage url setting for an extension.
+ *
+ * @param {object} extension
+ *   The extension setting the hompage url.
+ * @param {string} homepageUrl
+ *   The homepage url to set.
+ */
+async function handleHomepageUrl(extension, homepageUrl) {
+  // For new installs and enabling a disabled addon, we will show
+  // the prompt.  We clear the confirmation in onDisabled and
+  // onUninstalled, so in either ADDON_INSTALL or ADDON_ENABLE it
+  // is already cleared, resulting in the prompt being shown if
+  // necessary the next time the homepage is shown.
+
+  // For localizing the homepageUrl, or otherwise updating the value
+  // we need to always set the setting here.
+  let inControl = await ExtensionPreferencesManager.setSetting(
+    extension.id,
+    "homepage_override",
+    homepageUrl
+  );
+
+  if (inControl) {
+    Services.prefs.setBoolPref(
+      HOMEPAGE_PRIVATE_ALLOWED,
+      extension.privateBrowsingAllowed
+    );
+    // Also set this now as an upgraded browser will need this.
+    Services.prefs.setBoolPref(HOMEPAGE_EXTENSION_CONTROLLED, true);
+    if (extension.startupReason == "APP_STARTUP") {
+      handleInitialHomepagePopup(extension.id, homepageUrl);
+    } else {
+      homepagePopup.addObserver(extension.id);
+    }
+  }
+
+  // We need to monitor permission change and update the preferences.
+  // eslint-disable-next-line mozilla/balanced-listeners
+  extension.on("add-permissions", async (ignoreEvent, permissions) => {
+    if (permissions.permissions.includes("internal:privateBrowsingAllowed")) {
+      let item = await ExtensionPreferencesManager.getSetting(
+        "homepage_override"
+      );
+      if (item && item.id == extension.id) {
+        Services.prefs.setBoolPref(HOMEPAGE_PRIVATE_ALLOWED, true);
+      }
+    }
+  });
+  // eslint-disable-next-line mozilla/balanced-listeners
+  extension.on("remove-permissions", async (ignoreEvent, permissions) => {
+    if (permissions.permissions.includes("internal:privateBrowsingAllowed")) {
+      let item = await ExtensionPreferencesManager.getSetting(
+        "homepage_override"
+      );
+      if (item && item.id == extension.id) {
+        Services.prefs.setBoolPref(HOMEPAGE_PRIVATE_ALLOWED, false);
+      }
+    }
+  });
+}
+
+// When an extension starts up, a search engine may asynchronously be
+// registered, without blocking the startup. When an extension is
+// uninstalled, we need to wait for this registration to finish
+// before running the uninstallation handler.
+// Map[extension id -> Promise]
+var pendingSearchSetupTasks = new Map();
+
+this.chrome_settings_overrides = class extends ExtensionAPI {
+  static async processDefaultSearchSetting(action, id) {
+    await ExtensionSettingsStore.initialize();
+    let item = ExtensionSettingsStore.getSetting(
+      DEFAULT_SEARCH_STORE_TYPE,
+      DEFAULT_SEARCH_SETTING_NAME,
+      id
+    );
+    if (!item) {
+      return;
+    }
+    let control = await ExtensionSettingsStore.getLevelOfControl(
+      id,
+      DEFAULT_SEARCH_STORE_TYPE,
+      DEFAULT_SEARCH_SETTING_NAME
+    );
+    item = ExtensionSettingsStore[action](
+      id,
+      DEFAULT_SEARCH_STORE_TYPE,
+      DEFAULT_SEARCH_SETTING_NAME
+    );
+    if (item && control == "controlled_by_this_extension") {
+      try {
+        let engine = Services.search.getEngineByName(
+          item.value || item.initialValue
+        );
+        if (engine) {
+          await Services.search.setDefault(
+            engine,
+            action == "enable"
+              ? Ci.nsISearchService.CHANGE_REASON_ADDON_INSTALL
+              : Ci.nsISearchService.CHANGE_REASON_ADDON_UNINSTALL
+          );
+        }
+      } catch (e) {
+        Cu.reportError(e);
+      }
+    }
+  }
+
+  static async removeEngine(id) {
+    try {
+      await Services.search.removeWebExtensionEngine(id);
+    } catch (e) {
+      Cu.reportError(e);
+    }
+  }
+
+  static removeSearchSettings(id) {
+    return Promise.all([
+      this.processDefaultSearchSetting("removeSetting", id),
+      this.removeEngine(id),
+    ]);
+  }
+
+  static async onUninstall(id) {
+    let searchStartupPromise = pendingSearchSetupTasks.get(id);
+    if (searchStartupPromise) {
+      await searchStartupPromise.catch(Cu.reportError);
+    }
+    // Note: We do not have to manage the homepage setting here
+    // as it is managed by the ExtensionPreferencesManager.
+    return Promise.all([
+      this.removeSearchSettings(id),
+      homepagePopup.clearConfirmation(id),
+    ]);
+  }
+
+  static async onUpdate(id, manifest) {
+    if (!manifest?.chrome_settings_overrides?.homepage) {
+      // New or changed values are handled during onManifest.
+      ExtensionPreferencesManager.removeSetting(id, "homepage_override");
+    }
+
+    let search_provider = manifest?.chrome_settings_overrides?.search_provider;
+
+    if (!search_provider) {
+      // Remove setting and engine from search if necessary.
+      this.removeSearchSettings(id);
+    } else if (!search_provider.is_default) {
+      // Remove the setting, but keep the engine in search.
+      chrome_settings_overrides.processDefaultSearchSetting(
+        "removeSetting",
+        id
+      );
+    }
+  }
+
+  static async onDisable(id) {
+    homepagePopup.clearConfirmation(id);
+
+    await chrome_settings_overrides.processDefaultSearchSetting("disable", id);
+    await chrome_settings_overrides.removeEngine(id);
+  }
+
+  async onManifestEntry(entryName) {
+    let { extension } = this;
+    let { manifest } = extension;
+    let homepageUrl = manifest.chrome_settings_overrides.homepage;
+
+    // If this is a page we ignore, just skip the homepage setting completely.
+    if (homepageUrl) {
+      const ignoreHomePageUrl = await HomePage.shouldIgnore(homepageUrl);
+
+      if (ignoreHomePageUrl) {
+        Services.telemetry.recordEvent(
+          "homepage",
+          "preference",
+          "ignore",
+          "set_blocked_extension",
+          {
+            webExtensionId: extension.id,
+          }
+        );
+      } else {
+        await handleHomepageUrl(extension, homepageUrl);
+      }
+    }
+    if (manifest.chrome_settings_overrides.search_provider) {
+      // Registering a search engine can potentially take a long while,
+      // or not complete at all (when searchInitialized is never resolved),
+      // so we are deliberately not awaiting the returned promise here.
+      let searchStartupPromise =
+        this.processSearchProviderManifestEntry().finally(() => {
+          if (
+            pendingSearchSetupTasks.get(extension.id) === searchStartupPromise
+          ) {
+            pendingSearchSetupTasks.delete(extension.id);
+            // This is primarily for tests so that we know when an extension
+            // has finished initialising.
+            ExtensionParent.apiManager.emit("searchEngineProcessed", extension);
+          }
+        });
+
+      // Save the promise so we can await at onUninstall.
+      pendingSearchSetupTasks.set(extension.id, searchStartupPromise);
+    }
+  }
+
+  async ensureSetting(engineName, disable = false) {
+    let { extension } = this;
+    // Ensure the addon always has a setting
+    await ExtensionSettingsStore.initialize();
+    let item = ExtensionSettingsStore.getSetting(
+      DEFAULT_SEARCH_STORE_TYPE,
+      DEFAULT_SEARCH_SETTING_NAME,
+      extension.id
+    );
+    if (!item) {
+      let defaultEngine = await Services.search.getDefault();
+      item = await ExtensionSettingsStore.addSetting(
+        extension.id,
+        DEFAULT_SEARCH_STORE_TYPE,
+        DEFAULT_SEARCH_SETTING_NAME,
+        engineName,
+        () => defaultEngine.name
+      );
+      // If there was no setting, we're fixing old behavior in this api.
+      // A lack of a setting would mean it was disabled before, disable it now.
+      disable =
+        disable ||
+        ["ADDON_UPGRADE", "ADDON_DOWNGRADE", "ADDON_ENABLE"].includes(
+          extension.startupReason
+        );
+    }
+
+    // Ensure the item is disabled (either if exists and is not default or if it does not
+    // exist yet).
+    if (disable) {
+      item = await ExtensionSettingsStore.disable(
+        extension.id,
+        DEFAULT_SEARCH_STORE_TYPE,
+        DEFAULT_SEARCH_SETTING_NAME
+      );
+    }
+    return item;
+  }
+
+  async promptDefaultSearch(engineName) {
+    let { extension } = this;
+    // Don't ask if it is already the current engine
+    let engine = Services.search.getEngineByName(engineName);
+    let defaultEngine = await Services.search.getDefault();
+    if (defaultEngine.name == engine.name) {
+      return;
+    }
+    // Ensures the setting exists and is disabled.  If the
+    // user somehow bypasses the prompt, we do not want this
+    // setting enabled for this extension.
+    await this.ensureSetting(engineName, true);
+
+    let subject = {
+      wrappedJSObject: {
+        // This is a hack because we don't have the browser of
+        // the actual install. This means the popup might show
+        // in a different window. Will be addressed in a followup bug.
+        // As well, we still notify if no topWindow exists to support
+        // testing from xpcshell.
+        browser: windowTracker.topWindow?.gBrowser.selectedBrowser,
+        id: extension.id,
+        name: extension.name,
+        icon: extension.getPreferredIcon(32),
+        currentEngine: defaultEngine.name,
+        newEngine: engineName,
+        async respond(allow) {
+          if (allow) {
+            await chrome_settings_overrides.processDefaultSearchSetting(
+              "enable",
+              extension.id
+            );
+            await Services.search.setDefault(
+              Services.search.getEngineByName(engineName),
+              Ci.nsISearchService.CHANGE_REASON_ADDON_INSTALL
+            );
+          }
+          // For testing
+          Services.obs.notifyObservers(
+            null,
+            "webextension-defaultsearch-prompt-response"
+          );
+        },
+      },
+    };
+    Services.obs.notifyObservers(subject, "webextension-defaultsearch-prompt");
+  }
+
+  async processSearchProviderManifestEntry() {
+    let { extension } = this;
+    let { manifest } = extension;
+    let searchProvider = manifest.chrome_settings_overrides.search_provider;
+
+    // If we're not being requested to be set as default, then all we need
+    // to do is to add the engine to the service. The search service can cope
+    // with receiving added engines before it is initialised, so we don't have
+    // to wait for it.  Search Service will also prevent overriding a builtin
+    // engine appropriately.
+    if (!searchProvider.is_default) {
+      await this.addSearchEngine();
+      return;
+    }
+
+    await searchInitialized;
+    if (!this.extension) {
+      Cu.reportError(
+        `Extension shut down before search provider was registered`
+      );
+      return;
+    }
+
+    let engineName = searchProvider.name.trim();
+    let result = await Services.search.maybeSetAndOverrideDefault(extension);
+    // This will only be set to true when the specified engine is an app-provided
+    // engine, or when it is an allowed add-on defined in the list stored in
+    // SearchDefaultOverrideAllowlistHandler.
+    if (result.canChangeToAppProvided) {
+      await this.setDefault(engineName, true);
+    }
+    if (!result.canInstallEngine) {
+      // This extension is overriding an app-provided one, so we don't
+      // add its engine as well.
+      return;
+    }
+    await this.addSearchEngine();
+    if (extension.startupReason === "ADDON_INSTALL") {
+      await this.promptDefaultSearch(engineName);
+    } else {
+      // Needs to be called every time to handle reenabling.
+      await this.setDefault(engineName);
+    }
+  }
+
+  async setDefault(engineName, skipEnablePrompt = false) {
+    let { extension } = this;
+
+    if (extension.startupReason === "ADDON_INSTALL") {
+      // We should only get here if an extension is setting an app-provided
+      // engine to default and we are ignoring the addons other engine settings.
+      // In this case we do not show the prompt to the user.
+      let item = await this.ensureSetting(engineName);
+      await Services.search.setDefault(
+        Services.search.getEngineByName(item.value),
+        Ci.nsISearchService.CHANGE_REASON_ADDON_INSTALL
+      );
+    } else if (
+      ["ADDON_UPGRADE", "ADDON_DOWNGRADE", "ADDON_ENABLE"].includes(
+        extension.startupReason
+      )
+    ) {
+      // We would be called for every extension being enabled, we should verify
+      // that it has control and only then set it as default
+      let control = await ExtensionSettingsStore.getLevelOfControl(
+        extension.id,
+        DEFAULT_SEARCH_STORE_TYPE,
+        DEFAULT_SEARCH_SETTING_NAME
+      );
+
+      // Check for an inconsistency between the value returned by getLevelOfcontrol
+      // and the current engine actually set.
+      if (
+        control === "controlled_by_this_extension" &&
+        Services.search.defaultEngine.name !== engineName
+      ) {
+        // Check for and fix any inconsistency between the extensions settings storage
+        // and the current engine actually set.  If settings claims the extension is default
+        // but the search service claims otherwise, select what the search service claims
+        // (See Bug 1767550).
+        const allSettings = ExtensionSettingsStore.getAllSettings(
+          DEFAULT_SEARCH_STORE_TYPE,
+          DEFAULT_SEARCH_SETTING_NAME
+        );
+        for (const setting of allSettings) {
+          if (setting.value !== Services.search.defaultEngine.name) {
+            await ExtensionSettingsStore.disable(
+              setting.id,
+              DEFAULT_SEARCH_STORE_TYPE,
+              DEFAULT_SEARCH_SETTING_NAME
+            );
+          }
+        }
+        control = await ExtensionSettingsStore.getLevelOfControl(
+          extension.id,
+          DEFAULT_SEARCH_STORE_TYPE,
+          DEFAULT_SEARCH_SETTING_NAME
+        );
+      }
+
+      if (control === "controlled_by_this_extension") {
+        await Services.search.setDefault(
+          Services.search.getEngineByName(engineName),
+          Ci.nsISearchService.CHANGE_REASON_ADDON_INSTALL
+        );
+      } else if (control === "controllable_by_this_extension") {
+        if (skipEnablePrompt) {
+          // For overriding app-provided engines, we don't prompt, so set
+          // the default straight away.
+          await chrome_settings_overrides.processDefaultSearchSetting(
+            "enable",
+            extension.id
+          );
+          await Services.search.setDefault(
+            Services.search.getEngineByName(engineName),
+            Ci.nsISearchService.CHANGE_REASON_ADDON_INSTALL
+          );
+        } else if (extension.startupReason == "ADDON_ENABLE") {
+          // This extension has precedence, but is not in control.  Ask the user.
+          await this.promptDefaultSearch(engineName);
+        }
+      }
+    }
+  }
+
+  async addSearchEngine() {
+    let { extension } = this;
+    try {
+      await Services.search.addEnginesFromExtension(extension);
+    } catch (e) {
+      Cu.reportError(e);
+      return false;
+    }
+    return true;
+  }
+};
+
+ExtensionPreferencesManager.addSetting("homepage_override", {
+  prefNames: [
+    HOMEPAGE_PREF,
+    HOMEPAGE_EXTENSION_CONTROLLED,
+    HOMEPAGE_PRIVATE_ALLOWED,
+  ],
+  // ExtensionPreferencesManager will call onPrefsChanged when control changes
+  // and it updates the preferences. We are passed the item from
+  // ExtensionSettingsStore that details what is in control. If there is an id
+  // then control has changed to an extension, if there is no id then control
+  // has been returned to the user.
+  async onPrefsChanged(item) {
+    if (item.id) {
+      homepagePopup.addObserver(item.id);
+
+      let policy = ExtensionParent.WebExtensionPolicy.getByID(item.id);
+      let allowed = policy && policy.privateBrowsingAllowed;
+      if (!policy) {
+        // We'll generally hit this path during safe mode changes.
+        let perms = await ExtensionPermissions.get(item.id);
+        allowed = perms.permissions.includes("internal:privateBrowsingAllowed");
+      }
+      Services.prefs.setBoolPref(HOMEPAGE_PRIVATE_ALLOWED, allowed);
+      Services.prefs.setBoolPref(HOMEPAGE_EXTENSION_CONTROLLED, true);
+    } else {
+      homepagePopup.removeObserver();
+
+      Services.prefs.clearUserPref(HOMEPAGE_PRIVATE_ALLOWED);
+      Services.prefs.clearUserPref(HOMEPAGE_EXTENSION_CONTROLLED);
+    }
+  },
+  setCallback(value) {
+    // Setting the pref will result in onPrefsChanged being called, which
+    // will then set HOMEPAGE_PRIVATE_ALLOWED.  We want to ensure that this
+    // pref will be set/unset as apropriate.
+    return {
+      [HOMEPAGE_PREF]: value,
+      [HOMEPAGE_EXTENSION_CONTROLLED]: !!value,
+      [HOMEPAGE_PRIVATE_ALLOWED]: false,
+    };
+  },
+});