Bug 1542371 - Add basic support for ExtensionSettings policy. r=Felipe

Differential Revision: https://phabricator.services.mozilla.com/D26376

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

browser/components/enterprisepolicies/EnterprisePolicies.js

@@ -298,11 +298,26 @@ EnterprisePoliciesManager.prototype = {
     }
     return null;
   },
+
+  setExtensionSettings(extensionSettings) {
+    ExtensionSettings = extensionSettings;
+  },
+
+  getExtensionSettings(extensionID) {
+    let settings = null;
+    if (extensionID in ExtensionSettings) {
+      settings = ExtensionSettings[extensionID];
+    } else if ("*" in ExtensionSettings) {
+      settings = ExtensionSettings["*"];
+    }
+    return settings;
+  },
 };
 
 let DisallowedFeatures = {};
 let SupportMenu = null;
 let ExtensionPolicies = null;
+let ExtensionSettings = null;
 
 /**
  * areEnterpriseOnlyPoliciesAllowed

browser/components/enterprisepolicies/Policies.jsm

@@ -577,6 +577,12 @@ var Policies = {
     },
   },
 
+  "ExtensionSettings": {
+    onBeforeAddons(manager, param) {
+      manager.setExtensionSettings(param);
+    },
+  },
+
   "ExtensionUpdate": {
     onBeforeAddons(manager, param) {
       if (!param) {

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

@@ -313,6 +313,20 @@
       }
     },
 
+    "ExtensionSettings": {
+      "type": "object",
+      "patternProperties": {
+        "^.*$": {
+          "type": "object",
+          "properties": {
+            "blocked_install_message": {
+              "type": "string"
+            }
+          }
+        }
+      }
+    },
+
     "ExtensionUpdate": {
       "type": "boolean"
     },

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

@@ -54,6 +54,7 @@ skip-if = (verify && debug && (os == 'mac'))
 [browser_policy_display_bookmarks.js]
 [browser_policy_display_menu.js]
 [browser_policy_extensions.js]
+[browser_policy_extensionsettings.js]
 [browser_policy_locale.js]
 [browser_policy_override_postupdatepage.js]
 [browser_policy_permissions.js]

browser/components/enterprisepolicies/tests/browser/browser_policy_extensionsettings.js

@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+add_task(async function test_extensionsettings() {
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "ExtensionSettings": {
+        "extension1@mozilla.com": {
+          "blocked_install_message": "Extension1 error message.",
+        },
+        "*": {
+          "blocked_install_message": "Generic error message.",
+        },
+      },
+    },
+  });
+
+  let extensionSettings =  Services.policies.getExtensionSettings("extension1@mozilla.com");
+  is(extensionSettings.blocked_install_message, "Extension1 error message.", "Should have extension specific message.");
+  extensionSettings =  Services.policies.getExtensionSettings("extension2@mozilla.com");
+  is(extensionSettings.blocked_install_message, "Generic error message.", "Should have generic message.");
+});

toolkit/components/enterprisepolicies/nsIEnterprisePolicies.idl

@@ -37,4 +37,15 @@ interface nsIEnterprisePolicies : nsISupports
    * @returns A JS object that contains the storage or null if unavailable.
    */
   jsval getExtensionPolicy(in ACString extensionID);
+
+  /**
+   * Retrieves the ExtensionSettings policy for the given extensionID.
+   *
+   * If there is no policy for the extension, it returns the global policy.
+   *
+   * If there is no global policy, it returns null.
+   *
+   * @returns A JS object that settings or null if unavailable.
+   */
+  jsval getExtensionSettings(in ACString extensionID);
 };