From c94f5db02e2aa5fdf76ca935df2363dae7e3c9b6 Mon Sep 17 00:00:00 2001
From: Gregor Wagner <anygregor@gmail.com>
Date: Wed, 17 Apr 2013 07:51:51 -0400
Subject: [PATCH] Bug 861905 - Contacts API: Shortcut permission check in the
 child. r=mounir

---
 dom/contacts/ContactManager.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dom/contacts/ContactManager.js b/dom/contacts/ContactManager.js
index 830e7afd79ab..0ea900b82ae1 100644
--- a/dom/contacts/ContactManager.js
+++ b/dom/contacts/ContactManager.js
@@ -20,6 +20,10 @@ XPCOMUtils.defineLazyGetter(Services, "DOMRequest", function() {
   return Cc["@mozilla.org/dom/dom-request-service;1"].getService(Ci.nsIDOMRequestService);
 });
 
+XPCOMUtils.defineLazyServiceGetter(this, "pm",
+                                   "@mozilla.org/permissionmanager;1",
+                                   "nsIPermissionManager");
+
 XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
                                    "@mozilla.org/childprocessmessagemanager;1",
                                    "nsIMessageSender");
@@ -559,6 +563,15 @@ ContactManager.prototype = {
         access = "unknown";
       }
 
+    // Shortcut for ALLOW_ACTION so we avoid a parent roundtrip
+    let type = "contacts-" + access;
+    let permValue =
+      pm.testExactPermissionFromPrincipal(this._window.document.nodePrincipal, type);
+    if (permValue == Ci.nsIPermissionManager.ALLOW_ACTION) {
+      aAllowCallback();
+      return;
+    }
+
     let requestID = this.getRequestId({
       request: aRequest,
       allow: function() {