OAuth login fix

It took me some time to figure this out but I finally got it. There are some problems with the current dev in combination with oauth authorisation. And some for service in general.

in the service_oauth file i changed the following:

   $endpoint = array();
-  if (isset($method['endpoint']['services_oauth'])) {
+  // grep the specific settings for this method
+  if (!empty($method['endpoint']['services_oauth']['credentials'])) {
    $endpoint   = $method['endpoint']['services_oauth'];

The isset doesn't work here. The key is always set but the value isn't there if you haven't specified it in the UI. If there is no value it should grep it the default. It didn't.

     foreach ($endpoint->authentication as $auth_module => $settings) {
-      if (isset($settings) && $auth_error = services_auth_invoke($auth_module, 'authenticate_call', $settings, $controller, $args)) {
+      if (!empty($settings) && $auth_error = services_auth_invoke($auth_module, 'authenticate_call', $settings, $controller, $args)) {
         return services_error($auth_error, 401);
       }
     }

Again, the isset didn't work so changed it to empty. The problem was that the user object was rewriten due to the isset. So all the request you try to do using REST where as anonymous.

There are some more in the patch file.