core: use google-auto-auth

lib/common/util.js

@@ -22,7 +22,7 @@
  */
 
 var extend = require('extend');
-var GoogleAuth = require('google-auth-library');
+var googleAuth = require('google-auto-auth');
 var is = require('is');
 var nodeutil = require('util');
 var request = require('request').defaults({
@@ -324,109 +324,6 @@ function shouldRetryRequest(err) {
 
 util.shouldRetryRequest = shouldRetryRequest;
 
-/**
- * Create an Auth Client from Google Auth Library, used to get an access token
- * for authenticating API requests.
- *
- * @param {object} config - Configuration object.
- * @param {object=} config.authClient - AuthClient object. If not provided,
- *     it will be created and cached here.
- * @param {object=} config.credentials - Credentials object.
- * @param {string=} config.email - Account email address, required for PEM/P12
- *     usage.
- * @param {string=} config.keyFile - Path to a .json, .pem, or .p12 keyfile.
- * @param {array} config.scopes - Array of scopes required for the API.
- * @param {function} callback - The callback function.
- */
-function getAuthClient(config, callback) {
-  if (config.authClient) {
-    setImmediate(function() {
-      callback(null, config.authClient);
-    });
-    return;
-  }
-  var googleAuth = new GoogleAuth();
-
-  if (config.keyFile) {
-    var authClient = new googleAuth.JWT();
-    authClient.keyFile = config.keyFile;
-    authClient.email = config.email;
-    authClient.scopes = config.scopes;
-    addScope(null, authClient);
-  } else if (config.credentials) {
-    googleAuth.fromJSON(config.credentials, addScope);
-  } else {
-    googleAuth.getApplicationDefault(addScope);
-  }
-
-  function addScope(err, authClient) {
-    if (err) {
-      callback(err);
-      return;
-    }
-
-    if (authClient.createScopedRequired && authClient.createScopedRequired()) {
-      authClient = authClient.createScoped(config.scopes);
-    }
-
-    config.authClient = authClient;
-    callback(null, authClient);
-  }
-}
-
-util.getAuthClient = getAuthClient;
-
-/**
- * Authenticate a request by extending its headers object with an access token.
- *
- * @param {object} config - Configuration object.
- * @param {object=} config.authClient - AuthClient object. If not provided,
- *     it will be created and cached here.
- * @param {object=} config.credentials - Credentials object.
- * @param {string=} config.email - Account email address, required for PEM/P12
- *     usage.
- * @param {string=} config.keyFile - Path to a .json, .pem, or .p12 keyfile.
- * @param {array} config.scopes - Array of scopes required for the API.
- * @param {object} reqOpts - HTTP request options. Its `headers` object is
- *     created or extended with a valid access token.
- * @param {function} callback - The callback function.
- */
-function authorizeRequest(config, reqOpts, callback) {
-  util.getAuthClient(config, function(err, authClient) {
-    if (err) {
-      // google-auth-library returns a "Could not load..." error if it can't get
-      // an access token. However, it's possible an API request doesn't need to
-      // be authenticated, e.g. when downloading a file from a public bucket. We
-      // consider this error a warning, and allow the request to go through
-      // without authorization, relying on the upstream API to return an error
-      // the user would find more helpful, should one occur.
-      if (err.message.indexOf('Could not load') === 0) {
-        callback(null, reqOpts);
-      } else {
-        callback(err);
-      }
-      return;
-    }
-
-    authClient.getAccessToken(function(err, token) {
-      if (err) {
-        callback(err);
-        return;
-      }
-
-      var authorizedReqOpts = extend(true, {}, reqOpts, {
-        headers: {
-          Authorization: 'Bearer ' + token
-        }
-      });
-
-      callback(null, authorizedReqOpts);
-    });
-  });
-}
-
-util.authorizeRequest = authorizeRequest;
-
 /**
  * Get a function for making authorized requests.
  *
@@ -450,6 +347,8 @@ util.authorizeRequest = authorizeRequest;
 function makeAuthorizedRequestFactory(config) {
   config = config || {};
 
+  var authClient = googleAuth(config);
+
   /**
    * The returned function that will make an authorized request.
    *
@@ -470,7 +369,13 @@ function makeAuthorizedRequestFactory(config) {
     }
 
     function onAuthorized(err, authorizedReqOpts) {
-      if (err) {
+      // google-auth-library returns a "Could not load..." error if it can't get
+      // an access token. However, it's possible an API request doesn't need to
+      // be authenticated, e.g. when downloading a file from a public bucket. We
+      // consider this error a warning, and allow the request to go through
+      // without authorization, relying on the upstream API to return an error
+      // the user would find more helpful, should one occur.
+      if (err && err.message.indexOf('Could not load') === -1) {
         if (stream) {
           stream.destroy(err);
         } else {
@@ -490,38 +395,20 @@ function makeAuthorizedRequestFactory(config) {
     }
 
     if (reqConfig.customEndpoint) {
-      // Using a custom API override. Do not use `google-auth-library` for
+      // Using a custom API override. Do not use `google-auto-auth` for
       // authentication. (ex: connecting to a local Datastore server)
       onAuthorized(null, reqOpts);
     } else {
-      util.authorizeRequest(reqConfig, reqOpts, onAuthorized);
+      authClient.authorizeRequest(reqOpts, onAuthorized);
     }
 
     if (stream) {
       return stream;
     }
   }
 
-  makeAuthorizedRequest.getCredentials = function(callback) {
-    util.getAuthClient(config, function(err, authClient) {
-      if (err) {
-        callback(err);
-        return;
-      }
-
-      authClient.authorize(function(err) {
-        if (err) {
-          callback(err);
-          return;
-        }
-
-        callback(null, {
-          client_email: authClient.email,
-          private_key: authClient.key
-        });
-      });
-    });
-  };
+  makeAuthorizedRequest.getCredentials =
+    authClient.getCredentials.bind(authClient);
 
   return makeAuthorizedRequest;
 }

package.json

@@ -57,7 +57,7 @@
     "duplexify": "^3.2.0",
     "extend": "^2.0.0",
     "gce-images": "^0.1.0",
-    "google-auth-library": "^0.9.4",
+    "google-auto-auth": "^0.2.0",
     "is": "^3.0.1",
     "methmeth": "^1.0.0",
     "mime-types": "^2.0.8",