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Viewing file:     environment_credentials.js (2.86 KB)      -rw-r--r--

var AWS = require('../core');

/**
 * Represents credentials from the environment.
 *
 * By default, this class will look for the matching environment variables
 * prefixed by a given {envPrefix}. The un-prefixed environment variable names
 * for each credential value is listed below:
 *
 * ```javascript
 * accessKeyId: ACCESS_KEY_ID
 * secretAccessKey: SECRET_ACCESS_KEY
 * sessionToken: SESSION_TOKEN
 * ```
 *
 * With the default prefix of 'AWS', the environment variables would be:
 *
 *     AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
 *
 * @!attribute envPrefix
 *   @readonly
 *   @return [String] the prefix for the environment variable names excluding
 *     the separating underscore ('_').
 */
AWS.EnvironmentCredentials = AWS.util.inherit(AWS.Credentials, {

  /**
   * Creates a new EnvironmentCredentials class with a given variable
   * prefix {envPrefix}. For example, to load credentials using the 'AWS'
   * prefix:
   *
   * ```javascript
   * var creds = new AWS.EnvironmentCredentials('AWS');
   * creds.accessKeyId == 'AKID' // from AWS_ACCESS_KEY_ID env var
   * ```
   *
   * @param envPrefix [String] the prefix to use (e.g., 'AWS') for environment
   *   variables. Do not include the separating underscore.
   */
  constructor: function EnvironmentCredentials(envPrefix) {
    AWS.Credentials.call(this);
    this.envPrefix = envPrefix;
    this.get(function() {});
  },

  /**
   * Loads credentials from the environment using the prefixed
   * environment variables.
   *
   * @callback callback function(err)
   *   Called after the (prefixed) ACCESS_KEY_ID, SECRET_ACCESS_KEY, and
   *   SESSION_TOKEN environment variables are read. When this callback is
   *   called with no error, it means that the credentials information has
   *   been loaded into the object (as the `accessKeyId`, `secretAccessKey`,
   *   and `sessionToken` properties).
   *   @param err [Error] if an error occurred, this value will be filled
   * @see get
   */
  refresh: function refresh(callback) {
    if (!callback) callback = AWS.util.fn.callback;

    if (!process || !process.env) {
      callback(AWS.util.error(
        new Error('No process info or environment variables available'),
        { code: 'EnvironmentCredentialsProviderFailure' }
      ));
      return;
    }

    var keys = ['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY', 'SESSION_TOKEN'];
    var values = [];

    for (var i = 0; i < keys.length; i++) {
      var prefix = '';
      if (this.envPrefix) prefix = this.envPrefix + '_';
      values[i] = process.env[prefix + keys[i]];
      if (!values[i] && keys[i] !== 'SESSION_TOKEN') {
        callback(AWS.util.error(
          new Error('Variable ' + prefix + keys[i] + ' not set.'),
        { code: 'EnvironmentCredentialsProviderFailure' }
        ));
        return;
      }
    }

    this.expired = false;
    AWS.Credentials.apply(this, values);
    callback();
  }

});