ec2_metadata_credentials.js
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var AWS = require('../core');
require('../metadata_service');
/**
* Represents credentials received from the metadata service on an EC2 instance.
*
* By default, this class will connect to the metadata service using
* {AWS.MetadataService} and attempt to load any available credentials. If it
* can connect, and credentials are available, these will be used with zero
* configuration.
*
* This credentials class will by default timeout after 1 second of inactivity
* and retry 3 times.
* If your requests to the EC2 metadata service are timing out, you can increase
* these values by configuring them directly:
*
* ```javascript
* AWS.config.credentials = new AWS.EC2MetadataCredentials({
* httpOptions: { timeout: 5000 }, // 5 second timeout
* maxRetries: 10, // retry 10 times
* retryDelayOptions: { base: 200 } // see AWS.Config for information
* });
* ```
*
* @see AWS.Config.retryDelayOptions
*
* @!macro nobrowser
*/
AWS.EC2MetadataCredentials = AWS.util.inherit(AWS.Credentials, {
constructor: function EC2MetadataCredentials(options) {
AWS.Credentials.call(this);
options = options ? AWS.util.copy(options) : {};
options = AWS.util.merge(
{maxRetries: this.defaultMaxRetries}, options);
if (!options.httpOptions) options.httpOptions = {};
options.httpOptions = AWS.util.merge(
{timeout: this.defaultTimeout}, options.httpOptions);
this.metadataService = new AWS.MetadataService(options);
this.metadata = {};
},
/**
* @api private
*/
defaultTimeout: 1000,
/**
* @api private
*/
defaultMaxRetries: 3,
/**
* Loads the credentials from the instance metadata service
*
* @callback callback function(err)
* Called when the instance metadata service responds (or fails). 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) {
this.coalesceRefresh(callback || AWS.util.fn.callback);
},
/**
* @api private
* @param callback
*/
load: function load(callback) {
var self = this;
self.metadataService.loadCredentials(function(err, creds) {
if (!err) {
var currentTime = AWS.util.date.getDate();
var expireTime = new Date(creds.Expiration);
if (expireTime < currentTime) {
err = AWS.util.error(
new Error('EC2 Instance Metadata Serivce provided expired credentials'),
{ code: 'EC2MetadataCredentialsProviderFailure' }
);
} else {
self.expired = false;
self.metadata = creds;
self.accessKeyId = creds.AccessKeyId;
self.secretAccessKey = creds.SecretAccessKey;
self.sessionToken = creds.Token;
self.expireTime = expireTime;
}
}
callback(err);
});
}
});