TB 42110: Add TorUIUtils module for common tor component methods.

browser/base/content/browser.js

@@ -83,6 +83,7 @@ ChromeUtils.defineESModuleGetters(this, {
     "resource:///modules/firefox-view-tabs-setup-manager.sys.mjs",
   TelemetryEnvironment: "resource://gre/modules/TelemetryEnvironment.sys.mjs",
   ToolbarContextMenu: "resource:///modules/ToolbarContextMenu.sys.mjs",
+  TorUIUtils: "resource:///modules/TorUIUtils.sys.mjs",
   TranslationsParent: "resource://gre/actors/TranslationsParent.sys.mjs",
   UITour: "resource:///modules/UITour.sys.mjs",
   UpdateUtils: "resource://gre/modules/UpdateUtils.sys.mjs",

browser/base/content/browser.js.globals

@@ -268,5 +268,6 @@
   "BrowserSearch",
   "SelectableProfileService",
   "SecurityLevelButton",
-  "NewIdentityButton"
+  "NewIdentityButton",
+  "TorUIUtils"
 ]

browser/modules/TorUIUtils.sys.mjs

+/**
+ * Common methods for tor UI components.
+ */
+export const TorUIUtils = {
+  /**
+   * Shorten the given address if it is an onion address.
+   *
+   * @param {string} address - The address to shorten.
+   *
+   * @returns {string} The shortened form of the address, or the address itself
+   *   if it was not shortened.
+   */
+  shortenOnionAddress(address) {
+    if (
+      // Only shorten ".onion" addresses.
+      !address.endsWith(".onion") ||
+      // That are not "onion" aliases.
+      address.endsWith(".tor.onion") ||
+      // And are long.
+      address.length <= 21
+    ) {
+      return address;
+    }
+    return `${address.slice(0, 6)}…${address.slice(-12)}`;
+  },
+};

browser/modules/moz.build

@@ -138,6 +138,7 @@ EXTRA_JS_MODULES += [
     "SelectionChangedMenulist.sys.mjs",
     "SiteDataManager.sys.mjs",
     "SitePermissions.sys.mjs",
+    "TorUIUtils.sys.mjs",
     "TransientPrefs.sys.mjs",
     "URILoadingHelper.sys.mjs",
     "webrtcUI.sys.mjs",