pathPrefix.js

/*
 * Copyright 2012-2016 the original author or authors
 * @license MIT, see LICENSE.txt for details
 *
 * @author Scott Andrews
 */

'use strict';

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}
 */
module.exports = 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;
	}
});