Added node-modules

node_modules/googleapis/lib/cache.js

@@ -0,0 +1,112 @@
+/**
+ * Copyright 2013 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.
+ */
+
+var fs = require('fs');
+
+/**
+ * @const
+ * @private
+ * Path to the temporary directory.
+ * @type {String}
+ */
+Cache.TMP_DIR_ = __dirname + '/../.cache';
+
+/**
+ * @const
+ * @private
+ * Default encoding for cached files.
+ * @type {String}
+ */
+Cache.ENCODING_ = 'utf-8';
+
+/**
+ * @const
+ * @private
+ * Default expires time in micro seconds.
+ * @type {Number}
+ */
+Cache.EXPIRES_IN_ = 5 * 60 * 1000;
+
+/**
+ * @constructor
+ * Cache constructor.
+ * @param  {String} opt_opts  Optional options.
+ */
+function Cache(opt_opts) {
+  this.opts = opt_opts || {};
+  this.opts.path = this.opts.path || Cache.TMP_DIR_;
+  if (!fs.existsSync(this.opts.path)) {
+    fs.mkdirSync(this.opts.path, '700');
+  }
+}
+
+/**
+ * Loads discovery data from cache
+ * @param  {object} api
+ * @return {object?} Returns the cached discovery data if exists
+ *                   or not expired.
+ */
+Cache.prototype.load = function(api) {
+  var path = this.getPath(api);
+  // check if file exists and not expired
+  if (!fs.existsSync(path)) {
+    return null;
+  }
+
+  if (this.isExpired(path)) {
+    // delete the expired cache file
+    fs.unlinkSync(path);
+    return null;
+  }
+
+  var data = fs.readFileSync(this.getPath(api), Cache.ENCODING_);
+  return data && JSON.parse(data);
+};
+
+/**
+ * Writes api discovery data to the cache.
+ * @param  {object} api
+ * @param  {object} data
+ */
+Cache.prototype.write = function(api, data) {
+  data && fs.writeFileSync(
+      this.getPath(api), JSON.stringify(data), Cache.ENCODING_);
+};
+
+/**
+ * Checks whether the file at path is expired or not
+ * @param  {[type]}  path The path of the file to check.
+ * @return {Boolean}      Returns true or false depending on the expiration.
+ */
+Cache.prototype.isExpired = function(path) {
+  var expiresIn = this.opts.expiresIn || Cache.EXPIRES_IN_;
+  return new Date(fs.statSync(path).mtime).getTime() - expiresIn < 0;
+};
+
+/**
+ * Gets the path where the api data is stored at.
+ * @param  {[type]} api
+ * @return {string} Path to the data file.
+ */
+Cache.prototype.getPath = function(api) {
+  return this.opts.path + '/' + api.name + api.version;
+};
+
+/**
+ * Exports Cache.
+ * @type {Cache}
+ */
+module.exports = Cache;