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85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
var AWS = require('../core');
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/**
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* Represents credentials from the environment.
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*
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* By default, this class will look for the matching environment variables
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* prefixed by a given {envPrefix}. The un-prefixed environment variable names
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* for each credential value is listed below:
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*
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* ```javascript
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* accessKeyId: ACCESS_KEY_ID
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* secretAccessKey: SECRET_ACCESS_KEY
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* sessionToken: SESSION_TOKEN
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* ```
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*
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* With the default prefix of 'AWS', the environment variables would be:
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*
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* AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
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*
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* @!attribute envPrefix
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* @readonly
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* @return [String] the prefix for the environment variable names excluding
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* the separating underscore ('_').
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*/
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AWS.EnvironmentCredentials = AWS.util.inherit(AWS.Credentials, {
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/**
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* Creates a new EnvironmentCredentials class with a given variable
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* prefix {envPrefix}. For example, to load credentials using the 'AWS'
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* prefix:
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*
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* ```javascript
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* var creds = new AWS.EnvironmentCredentials('AWS');
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* creds.accessKeyId == 'AKID' // from AWS_ACCESS_KEY_ID env var
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* ```
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*
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* @param envPrefix [String] the prefix to use (e.g., 'AWS') for environment
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* variables. Do not include the separating underscore.
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*/
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constructor: function EnvironmentCredentials(envPrefix) {
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AWS.Credentials.call(this);
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this.envPrefix = envPrefix;
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this.get(function() {});
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},
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/**
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* Loads credentials from the environment using the prefixed
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* environment variables.
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*
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* @callback callback function(err)
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* Called when the instance metadata 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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if (!callback) callback = function(err) { if (err) throw err; };
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if (process === undefined) {
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callback(new Error('No process info available'));
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return;
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}
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var keys = ['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY', 'SESSION_TOKEN'];
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var values = [];
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for (var i = 0; i < keys.length; i++) {
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var prefix = '';
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if (this.envPrefix) prefix = this.envPrefix + '_';
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values[i] = process.env[prefix + keys[i]];
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if (!values[i] && keys[i] !== 'SESSION_TOKEN') {
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callback(new Error('Variable ' + prefix + keys[i] + ' not set.'));
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return;
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}
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}
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this.expired = false;
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AWS.Credentials.apply(this, values);
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callback();
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}
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});
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