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file_system_credentials.js (2134B)

      1 var AWS = require('../core');
      2 
      3 /**
      4  * Represents credentials from a JSON file on disk.
      5  * If the credentials expire, the SDK can {refresh} the credentials
      6  * from the file.
      7  *
      8  * The format of the file should be similar to the options passed to
      9  * {AWS.Config}:
     10  *
     11  * ```javascript
     12  * {accessKeyId: 'akid', secretAccessKey: 'secret', sessionToken: 'optional'}
     13  * ```
     14  *
     15  * @example Loading credentials from disk
     16  *   var creds = new AWS.FileSystemCredentials('./configuration.json');
     17  *   creds.accessKeyId == 'AKID'
     18  *
     19  * @!attribute filename
     20  *   @readonly
     21  *   @return [String] the path to the JSON file on disk containing the
     22  *     credentials.
     23  * @!macro nobrowser
     24  */
     25 AWS.FileSystemCredentials = AWS.util.inherit(AWS.Credentials, {
     26 
     27   /**
     28    * @overload AWS.FileSystemCredentials(filename)
     29    *   Creates a new FileSystemCredentials object from a filename
     30    *
     31    *   @param filename [String] the path on disk to the JSON file to load.
     32    */
     33   constructor: function FileSystemCredentials(filename) {
     34     AWS.Credentials.call(this);
     35     this.filename = filename;
     36     this.get(function() {});
     37   },
     38 
     39   /**
     40    * Loads the credentials from the {filename} on disk.
     41    *
     42    * @callback callback function(err)
     43    *   Called after the JSON file on disk is read and parsed. When this callback
     44    *   is called with no error, it means that the credentials information
     45    *   has been loaded into the object (as the `accessKeyId`, `secretAccessKey`,
     46    *   and `sessionToken` properties).
     47    *   @param err [Error] if an error occurred, this value will be filled
     48    * @see get
     49    */
     50   refresh: function refresh(callback) {
     51     if (!callback) callback = function(err) { if (err) throw err; };
     52     try {
     53       var creds = JSON.parse(AWS.util.readFileSync(this.filename));
     54       AWS.Credentials.call(this, creds);
     55       if (!this.accessKeyId || !this.secretAccessKey) {
     56         throw AWS.util.error(
     57           new Error('Credentials not set in ' + this.filename),
     58         { code: 'FileSystemCredentialsProviderFailure' }
     59         );
     60       }
     61       this.expired = false;
     62       callback();
     63     } catch (err) {
     64       callback(err);
     65     }
     66   }
     67 
     68 });