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ec2_metadata_credentials.js (2610B)

      1 var AWS = require('../core');
      2 require('../metadata_service');
      3 
      4 /**
      5  * Represents credentials received from the metadata service on an EC2 instance.
      6  *
      7  * By default, this class will connect to the metadata service using
      8  * {AWS.MetadataService} and attempt to load any available credentials. If it
      9  * can connect, and credentials are available, these will be used with zero
     10  * configuration.
     11  *
     12  * This credentials class will by default timeout after 1 second of inactivity
     13  * and retry 3 times.
     14  * If your requests to the EC2 metadata service are timing out, you can increase
     15  * these values by configuring them directly:
     16  *
     17  * ```javascript
     18  * AWS.config.credentials = new AWS.EC2MetadataCredentials({
     19  *   httpOptions: { timeout: 5000 }, // 5 second timeout
     20  *   maxRetries: 10, // retry 10 times
     21  *   retryDelayOptions: { base: 200 } // see AWS.Config for information
     22  * });
     23  * ```
     24  *
     25  * @see AWS.Config.retryDelayOptions
     26  *
     27  * @!macro nobrowser
     28  */
     29 AWS.EC2MetadataCredentials = AWS.util.inherit(AWS.Credentials, {
     30   constructor: function EC2MetadataCredentials(options) {
     31     AWS.Credentials.call(this);
     32 
     33     options = options ? AWS.util.copy(options) : {};
     34     options = AWS.util.merge(
     35       {maxRetries: this.defaultMaxRetries}, options);
     36     if (!options.httpOptions) options.httpOptions = {};
     37     options.httpOptions = AWS.util.merge(
     38       {timeout: this.defaultTimeout}, options.httpOptions);
     39 
     40     this.metadataService = new AWS.MetadataService(options);
     41     this.metadata = {};
     42   },
     43 
     44   /**
     45    * @api private
     46    */
     47   defaultTimeout: 1000,
     48 
     49   /**
     50    * @api private
     51    */
     52   defaultMaxRetries: 3,
     53 
     54   /**
     55    * Loads the credentials from the instance metadata service
     56    *
     57    * @callback callback function(err)
     58    *   Called when the instance metadata service responds (or fails). When
     59    *   this callback is called with no error, it means that the credentials
     60    *   information has been loaded into the object (as the `accessKeyId`,
     61    *   `secretAccessKey`, and `sessionToken` properties).
     62    *   @param err [Error] if an error occurred, this value will be filled
     63    * @see get
     64    */
     65   refresh: function refresh(callback) {
     66     var self = this;
     67     if (!callback) callback = function(err) { if (err) throw err; };
     68 
     69     self.metadataService.loadCredentials(function (err, creds) {
     70       if (!err) {
     71         self.expired = false;
     72         self.metadata = creds;
     73         self.accessKeyId = creds.AccessKeyId;
     74         self.secretAccessKey = creds.SecretAccessKey;
     75         self.sessionToken = creds.Token;
     76         self.expireTime = new Date(creds.Expiration);
     77       }
     78       callback(err);
     79     });
     80   }
     81 });