portainer/app/extensions/oauth/services/rest/oauth.js

angular.module('portainer.extensions.oauth')
.factory('OAuth', ['$resource', 'API_ENDPOINT_OAUTH', function OAuthFactory($resource, API_ENDPOINT_OAUTH) {
  'use strict';
  return $resource(API_ENDPOINT_OAUTH + '/:action', {}, {
    validate: {
      method: 'POST', 
      ignoreLoadingBar: true,
      params: {
        action: 'validate'
      }
    }
  });
}]);