rest/interceptor/pathPrefix.js

/*
 * Copyright 2012-2013 the original author or authors
 * @license MIT, see LICENSE.txt for details
 *
 * @author Scott Andrews
 */

(function (define) {
	'use strict';

	define(function (require) {

		var interceptor, UrlBuilder;

		interceptor = require('../interceptor');
		UrlBuilder = require('../UrlBuilder');

		function startsWith(str, prefix) {
			return str.indexOf(prefix) === 0;
		}

		function endsWith(str, suffix) {
			return str.lastIndexOf(suffix) + suffix.length === str.length;
		}

		/**
		 * Prefixes the request path with a common value.
		 *
		 * @param {Client} [client] client to wrap
		 * @param {number} [config.prefix] path prefix
		 *
		 * @returns {Client}
		 */
		return interceptor({
			request: function (request, config) {
				var path;

				if (config.prefix && !(new UrlBuilder(request.path).isFullyQualified())) {
					path = config.prefix;
					if (request.path) {
						if (!endsWith(path, '/') && !startsWith(request.path, '/')) {
							// add missing '/' between path sections
							path += '/';
						}
						path += request.path;
					}
					request.path = path;
				}

				return request;
			}
		});

	});

}(
	typeof define === 'function' && define.amd ? define : function (factory) { module.exports = factory(require); }
	// Boilerplate for AMD and Node
));