Bug 1491046 - Allow a whitelist of preferences via policy. r=Felipe,flod

Differential Revision: https://phabricator.services.mozilla.com/D25685

--HG--
extra : moz-landing-system : lando

browser/components/enterprisepolicies/Policies.jsm

@@ -751,6 +751,14 @@ var Policies = {
     },
   },
 
+  "Preferences": {
+    onBeforeAddons(manager, param) {
+      for (let preference in param) {
+        setAndLockPref(preference, param[preference]);
+      }
+    },
+  },
+
   "Proxy": {
     onBeforeAddons(manager, param) {
       if (param.Locked) {

browser/components/enterprisepolicies/schemas/policies-schema.json

@@ -551,6 +551,21 @@
       }
     },
 
+    "Preferences": {
+      "type": "object",
+      "properties": {
+        "network.IDN_show_punycode": {
+          "type": "boolean"
+        },
+        "browser.fixup.dns_first_for_single_words": {
+          "type": "boolean"
+        },
+        "browser.cache.disk.parent_directory": {
+          "type": "string"
+        }
+      }
+    },
+
     "Proxy": {
       "type": "object",
       "properties": {

browser/components/enterprisepolicies/tests/browser/browser.ini

@@ -58,6 +58,7 @@ skip-if = (verify && debug && (os == 'mac'))
 [browser_policy_override_postupdatepage.js]
 [browser_policy_permissions.js]
 [browser_policy_proxy.js]
+[browser_policy_preferences.js]
 [browser_policy_search_engine.js]
 [browser_policy_searchbar.js]
 [browser_policy_set_homepage.js]

browser/components/enterprisepolicies/tests/browser/browser_policy_preferences.js

+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* This test is not intended to test all preferences that
+   can be set with Preferences, just a subset to verify
+   the overall functionality */
+
+"use strict";
+
+add_task(async function test_policy_preferences() {
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "Preferences": {
+        "network.IDN_show_punycode": true,
+        "app.update.log": true,
+      },
+    },
+  });
+
+  checkLockedPref("network.IDN_show_punycode", true);
+  is(Services.prefs.getBoolPref("app.update.log"), false, "Disallowed pref was not been changed");
+ });

browser/locales/en-US/browser/policies/policies-descriptions.ftl

@@ -111,6 +111,8 @@ policy-Permissions = Configure permissions for camera, microphone, location and
 
 policy-PopupBlocking = Allow certain websites to display popups by default.
 
+policy-Preferences = Set and lock the value for a subset of preferences.
+
 policy-Proxy = Configure proxy settings.
 
 policy-RequestedLocales = Set the list of requested locales for the application in order of preference.