1 files changed, 47 insertions, 0 deletions
diff --git a/toolkit/components/extensions/parent/ext-i18n.js b/toolkit/components/extensions/parent/ext-i18n.js
new file mode 100644
index 0000000000..57a3d60081
--- /dev/null
+++ b/toolkit/components/extensions/parent/ext-i18n.js
@@ -0,0 +1,47 @@
+/* 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";
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "LanguageDetector",
+  "resource://gre/modules/translation/LanguageDetector.jsm"
+);
+
+this.i18n = class extends ExtensionAPI {
+  getAPI(context) {
+    let { extension } = context;
+    return {
+      i18n: {
+        getMessage: function(messageName, substitutions) {
+          return extension.localizeMessage(messageName, substitutions, {
+            cloneScope: context.cloneScope,
+          });
+        },
+
+        getAcceptLanguages: function() {
+          let result = extension.localeData.acceptLanguages;
+          return Promise.resolve(result);
+        },
+
+        getUILanguage: function() {
+          return extension.localeData.uiLocale;
+        },
+
+        detectLanguage: function(text) {
+          return LanguageDetector.detectLanguage(text).then(result => ({
+            isReliable: result.confident,
+            languages: result.languages.map(lang => {
+              return {
+                language: lang.languageCode,
+                percentage: lang.percent,
+              };
+            }),
+          }));
+        },
+      },
+    };
+  }
+};