Add aws.js

src/aws.js

@@ -0,0 +1,64 @@
+/* jslint node:true */
+
+'use strict';
+
+exports = module.exports = {
+    AWSError: AWSError,
+
+    getAWSCredentials: getAWSCredentials
+};
+
+var assert = require('assert'),
+    config = require('./config.js'),
+    debug = require('debug')('box:aws'),
+    superagent = require('superagent'),
+    util = require('util');
+
+// http://dustinsenos.com/articles/customErrorsInNode
+// http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
+function AWSError(reason, errorOrMessage) {
+    assert.strictEqual(typeof reason, 'string');
+    assert(errorOrMessage instanceof Error || typeof errorOrMessage === 'string' || typeof errorOrMessage === 'undefined');
+
+    Error.call(this);
+    Error.captureStackTrace(this, this.constructor);
+
+    this.name = this.constructor.name;
+    this.reason = reason;
+    if (typeof errorOrMessage === 'undefined') {
+        this.message = reason;
+    } else if (typeof errorOrMessage === 'string') {
+        this.message = errorOrMessage;
+    } else {
+        this.message = 'Internal error';
+        this.nestedError = errorOrMessage;
+    }
+}
+util.inherits(AWSError, Error);
+AWSError.INTERNAL_ERROR = 'Internal Error';
+AWSError.MISSING_CREDENTIALS = 'Missing AWS credentials';
+
+function getAWSCredentials(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('getAWSCredentials()');
+
+    // CaaS
+    if (config.token()) {
+        var url = config.apiServerOrigin() + '/api/v1/boxes/' + config.fqdn() + '/awscredentials';
+        superagent.get(url).query({ token: config.token() }).end(function (error, result) {
+            if (error) return callback(error);
+            if (result.statusCode !== 200) return callback(new Error(result.text));
+            if (!result.body) return callback(new Error('Unexpected response'));
+
+            debug('getAWSCredentials()', result.body);
+
+            return callback(null, result.body.credentials);
+        });
+    } else {
+        // return credentials from config.js
+        callback(new AWSError(AWSError.MISSING_CREDENTIALS));
+    }
+}
+
+