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104 lines
3.9 KiB
JavaScript
104 lines
3.9 KiB
JavaScript
var AWS = require('../core');
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/**
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* Represents temporary credentials retrieved from {AWS.STS}. Without any
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* extra parameters, credentials will be fetched from the
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* {AWS.STS.getSessionToken} operation. If an IAM role is provided, the
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* {AWS.STS.assumeRole} operation will be used to fetch credentials for the
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* role instead.
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*
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* To setup temporary credentials, configure a set of master credentials
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* using the standard credentials providers (environment, EC2 instance metadata,
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* or from the filesystem), then set the global credentials to a new
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* temporary credentials object:
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*
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* ```javascript
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* // Note that environment credentials are loaded by default,
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* // the following line is shown for clarity:
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* AWS.config.credentials = new AWS.EnvironmentCredentials('AWS');
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*
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* // Now set temporary credentials seeded from the master credentials
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* AWS.config.credentials = new AWS.TemporaryCredentials();
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*
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* // subsequent requests will now use temporary credentials from AWS STS.
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* new AWS.S3().listBucket(function(err, data) { ... });
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* ```
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*
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* @!attribute masterCredentials
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* @return [AWS.Credentials] the master (non-temporary) credentials used to
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* get and refresh temporary credentials from AWS STS.
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* @note (see constructor)
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*/
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AWS.TemporaryCredentials = AWS.util.inherit(AWS.Credentials, {
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/**
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* Creates a new temporary credentials object.
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*
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* @note In order to create temporary credentials, you first need to have
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* "master" credentials configured in {AWS.Config.credentials}. These
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* master credentials are necessary to retrieve the temporary credentials,
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* as well as refresh the credentials when they expire.
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* @param params [map] a map of options that are passed to the
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* {AWS.STS.assumeRole} or {AWS.STS.getSessionToken} operations.
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* If a `RoleArn` parameter is passed in, credentials will be based on the
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* IAM role.
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* @example Creating a new credenials object for generic temporary credentials
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* AWS.config.credentials = new AWS.TemporaryCredentials();
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* @example Creating a new credentials object for an IAM role
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* AWS.config.credentials = new AWS.TemporaryCredentials({
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* RoleArn: 'arn:aws:iam::1234567890:role/TemporaryCredentials',
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* });
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* @see AWS.STS.assumeRole
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* @see AWS.STS.getSessionToken
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*/
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constructor: function TemporaryCredentials(params) {
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AWS.Credentials.call(this);
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this.loadMasterCredentials();
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this.service = new AWS.STS();
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this.expired = true;
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this.params = params || {};
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if (this.params.RoleArn) {
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this.params.RoleSessionName =
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this.params.RoleSessionName || 'temporary-credentials';
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}
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},
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/**
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* Refreshes credentials using {AWS.STS.assumeRole} or
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* {AWS.STS.getSessionToken}, depending on whether an IAM role ARN was passed
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* to the credentials {constructor}.
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*
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* @callback callback function(err)
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* Called when the STS service responds (or fails). When
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* this callback is called with no error, it means that the credentials
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* information has been loaded into the object (as the `accessKeyId`,
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* `secretAccessKey`, and `sessionToken` properties).
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* @param err [Error] if an error occurred, this value will be filled
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* @see get
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*/
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refresh: function refresh(callback) {
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var self = this;
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if (!callback) callback = function(err) { if (err) throw err; };
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self.service.config.credentials = self.masterCredentials;
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var operation = self.params.RoleArn ?
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self.service.assumeRole : self.service.getSessionToken;
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operation.call(self.service, self.params, function (err, data) {
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if (!err) {
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self.service.credentialsFrom(data, self);
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}
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callback(err);
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});
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},
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/**
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* @api private
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*/
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loadMasterCredentials: function loadMasterCredentials() {
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this.masterCredentials = AWS.config.credentials;
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while (this.masterCredentials.masterCredentials) {
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this.masterCredentials = this.masterCredentials.masterCredentials;
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}
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}
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});
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