Bug 782211 - Part 4: Add function to remote test for permission in nsIPermissionManager. r=cjones

dom/ipc/ContentParent.cpp

@@ -2272,6 +2272,23 @@ ContentParent::RecvCloseAlert(const nsString& aName)
     return true;
 }
 
+bool
+ContentParent::RecvTestPermissionFromPrincipal(const IPC::Principal& aPrincipal,
+                                               const nsCString& aType,
+                                               uint32_t* permission)
+{
+    nsCOMPtr<nsIPermissionManager> permissionManager =
+        do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
+    NS_ENSURE_TRUE(permissionManager, false);
+
+    nsresult rv = permissionManager->TestPermissionFromPrincipal(aPrincipal,
+                                                                 aType.get(),
+                                                                 permission);
+    NS_ENSURE_SUCCESS(rv, false);
+
+    return true;
+}
+
 bool
 ContentParent::RecvSyncMessage(const nsString& aMsg,
                                const ClonedMessageData& aData,

dom/ipc/ContentParent.h

@@ -333,6 +333,10 @@ private:
 
     virtual bool RecvCloseAlert(const nsString& aName);
 
+    virtual bool RecvTestPermissionFromPrincipal(const IPC::Principal& aPrincipal,
+                                                 const nsCString& aType,
+                                                 uint32_t* permission);
+
     virtual bool RecvLoadURIExternal(const URIParams& uri);
 
     virtual bool RecvSyncMessage(const nsString& aMsg,

dom/ipc/PContent.ipdl

@@ -433,6 +433,22 @@ parent:
 
     CloseAlert(nsString name);
 
+    /**
+     * Tests permission for a provided principal using the permission
+     * manager.
+     *
+     * @param principal
+     *   The principal to test for the permissions.
+     * @param type
+     *   The type of permission to for the principal.
+     *
+     * NOTE: The principal is untrusted in the parent process. Only
+     *       principals that can live in the content process should
+     *       be provided.
+     */
+    sync TestPermissionFromPrincipal(Principal principal, nsCString type)
+        returns (uint32_t permission);
+
     PExternalHelperApp(OptionalURIParams uri, nsCString aMimeContentType,
                        nsCString aContentDisposition, bool aForceSave,
                        int64_t aContentLength, OptionalURIParams aReferrer);