Adds an implementation of IAM credentials

lib/auth/googleauth.js

@@ -58,6 +58,11 @@ function createError(message, err) {
   return Error(s);
 }
 
+/**
+ * Convenience field mapping in the IAM credential type.
+ */
+GoogleAuth.prototype.IAM = require('./iam.js');
+
 /**
  * Convenience field mapping in the Compute credential type.
  */

lib/auth/iam.js

@@ -0,0 +1,59 @@
+/**
+ * Copyright 2015 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+/**
+ * IAM credentials.
+ *
+ * @param {string=} selector the iam authority selector
+ * @param {string=} token the token
+ * @constructor
+ */
+function IAM(selector, token) {
+  this.selector = selector;
+  this.token = token;
+}
+
+/**
+ * Indicates whether the credential requires scopes to be created by calling
+ * createdScoped before use.
+ *
+ * @return {boolean} always false
+ */
+IAM.prototype.createScopedRequired = function() {
+  // IAM authorization does not use scopes.
+  return false;
+};
+
+/**
+ * Pass the selector and token to the metadataFn callback.
+ *
+ * @param {string} unused_uri_ is required of the credentials interface
+ * @param {function} metadataFn a callback invoked with object
+ *                   containing request metadata.
+ */
+IAM.prototype.getRequestMetadata = function(unused_uri_, metadataFn) {
+  metadataFn(null, {
+    'x-goog-iam-authority-selector': this.selector,
+    'x-goog-iam-authorization-token': this.token
+  });
+};
+
+/**
+ * Export IAM.
+ */
+module.exports = IAM;