453 lines
10 KiB
JavaScript
Executable File
453 lines
10 KiB
JavaScript
Executable File
/**
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* Module dependencies.
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*/
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var Route = require('./route');
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var Layer = require('./layer');
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var methods = require('methods');
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var debug = require('debug')('express:router');
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var parseUrl = require('parseurl');
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var slice = Array.prototype.slice;
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/**
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* Initialize a new `Router` with the given `options`.
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*
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* @param {Object} options
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* @return {Router} which is an callable function
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* @api public
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*/
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var proto = module.exports = function(options) {
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options = options || {};
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function router(req, res, next) {
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router.handle(req, res, next);
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}
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// mixin Router class functions
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router.__proto__ = proto;
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router.params = {};
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router._params = [];
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router.caseSensitive = options.caseSensitive;
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router.strict = options.strict;
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router.stack = [];
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return router;
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};
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/**
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* Map the given param placeholder `name`(s) to the given callback.
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*
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* Parameter mapping is used to provide pre-conditions to routes
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* which use normalized placeholders. For example a _:user_id_ parameter
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* could automatically load a user's information from the database without
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* any additional code,
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*
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* The callback uses the same signature as middleware, the only difference
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* being that the value of the placeholder is passed, in this case the _id_
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* of the user. Once the `next()` function is invoked, just like middleware
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* it will continue on to execute the route, or subsequent parameter functions.
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*
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* Just like in middleware, you must either respond to the request or call next
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* to avoid stalling the request.
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*
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* app.param('user_id', function(req, res, next, id){
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* User.find(id, function(err, user){
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* if (err) {
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* return next(err);
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* } else if (!user) {
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* return next(new Error('failed to load user'));
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* }
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* req.user = user;
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* next();
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* });
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* });
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*
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* @param {String} name
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* @param {Function} fn
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* @return {app} for chaining
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* @api public
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*/
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proto.param = function(name, fn){
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// param logic
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if ('function' == typeof name) {
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this._params.push(name);
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return;
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}
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// apply param functions
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var params = this._params;
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var len = params.length;
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var ret;
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if (name[0] === ':') {
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name = name.substr(1);
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}
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for (var i = 0; i < len; ++i) {
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if (ret = params[i](name, fn)) {
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fn = ret;
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}
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}
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// ensure we end up with a
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// middleware function
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if ('function' != typeof fn) {
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throw new Error('invalid param() call for ' + name + ', got ' + fn);
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}
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(this.params[name] = this.params[name] || []).push(fn);
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return this;
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};
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/**
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* Dispatch a req, res into the router.
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*
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* @api private
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*/
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proto.handle = function(req, res, done) {
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var self = this;
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debug('dispatching %s %s', req.method, req.url);
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var method = req.method.toLowerCase();
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var search = 1 + req.url.indexOf('?');
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var pathlength = search ? search - 1 : req.url.length;
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var fqdn = 1 + req.url.substr(0, pathlength).indexOf('://');
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var protohost = fqdn ? req.url.substr(0, req.url.indexOf('/', 2 + fqdn)) : '';
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var idx = 0;
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var removed = '';
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var slashAdded = false;
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var paramcalled = {};
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// store options for OPTIONS request
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// only used if OPTIONS request
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var options = [];
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// middleware and routes
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var stack = self.stack;
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// manage inter-router variables
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var parent = req.next;
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var parentUrl = req.baseUrl || '';
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done = wrap(done, function(old, err) {
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req.baseUrl = parentUrl;
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req.next = parent;
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old(err);
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});
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req.next = next;
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// for options requests, respond with a default if nothing else responds
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if (method === 'options') {
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done = wrap(done, function(old, err) {
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if (err || options.length === 0) return old(err);
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var body = options.join(',');
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return res.set('Allow', body).send(body);
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});
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}
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next();
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function next(err) {
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if (err === 'route') {
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err = undefined;
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}
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var layer = stack[idx++];
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var layerPath;
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if (!layer) {
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return done(err);
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}
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if (slashAdded) {
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req.url = req.url.substr(1);
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slashAdded = false;
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}
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req.baseUrl = parentUrl;
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req.url = protohost + removed + req.url.substr(protohost.length);
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req.originalUrl = req.originalUrl || req.url;
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removed = '';
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try {
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var path = parseUrl(req).pathname;
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if (undefined == path) path = '/';
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if (!layer.match(path)) return next(err);
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// route object and not middleware
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var route = layer.route;
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// if final route, then we support options
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if (route) {
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// we don't run any routes with error first
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if (err) {
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return next(err);
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}
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req.route = route;
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// we can now dispatch to the route
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if (method === 'options' && !route.methods['options']) {
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options.push.apply(options, route._options());
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}
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}
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// Capture one-time layer values
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req.params = layer.params;
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layerPath = layer.path;
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// this should be done for the layer
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return self.process_params(layer, paramcalled, req, res, function(err) {
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if (err) {
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return next(err);
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}
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if (route) {
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return layer.handle(req, res, next);
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}
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trim_prefix();
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});
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} catch (err) {
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next(err);
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}
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function trim_prefix() {
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var c = path[layerPath.length];
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if (c && '/' != c && '.' != c) return next(err);
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// Trim off the part of the url that matches the route
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// middleware (.use stuff) needs to have the path stripped
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removed = layerPath;
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if (removed.length) {
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debug('trim prefix (%s) from url %s', layerPath, req.url);
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req.url = protohost + req.url.substr(protohost.length + removed.length);
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}
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// Ensure leading slash
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if (!fqdn && req.url[0] !== '/') {
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req.url = '/' + req.url;
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slashAdded = true;
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}
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// Setup base URL (no trailing slash)
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if (removed.length && removed.substr(-1) === '/') {
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req.baseUrl = parentUrl + removed.substring(0, removed.length - 1);
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} else {
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req.baseUrl = parentUrl + removed;
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}
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debug('%s %s : %s', layer.handle.name || 'anonymous', layerPath, req.originalUrl);
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var arity = layer.handle.length;
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try {
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if (err && arity === 4) {
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layer.handle(err, req, res, next);
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} else if (!err && arity < 4) {
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layer.handle(req, res, next);
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} else {
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next(err);
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}
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} catch (err) {
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next(err);
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}
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}
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}
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function wrap(old, fn) {
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return function () {
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var args = [old].concat(slice.call(arguments));
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fn.apply(this, args);
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};
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}
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};
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/**
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* Process any parameters for the layer.
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*
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* @api private
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*/
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proto.process_params = function(layer, called, req, res, done) {
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var params = this.params;
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// captured parameters from the layer, keys and values
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var keys = layer.keys;
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// fast track
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if (!keys || keys.length === 0) {
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return done();
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}
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var i = 0;
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var name;
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var paramIndex = 0;
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var key;
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var paramVal;
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var paramCallbacks;
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var paramCalled;
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// process params in order
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// param callbacks can be async
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function param(err) {
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if (err) {
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return done(err);
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}
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if (i >= keys.length ) {
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return done();
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}
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paramIndex = 0;
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key = keys[i++];
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if (!key) {
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return done();
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}
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name = key.name;
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paramVal = req.params[name];
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paramCallbacks = params[name];
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paramCalled = called[name];
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if (paramVal === undefined || !paramCallbacks) {
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return param();
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}
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// param previously called with same value or error occurred
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if (paramCalled && (paramCalled.error || paramCalled.match === paramVal)) {
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// restore value
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req.params[name] = paramCalled.value;
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// next param
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return param(paramCalled.error);
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}
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called[name] = paramCalled = {
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error: null,
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match: paramVal,
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value: paramVal
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};
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try {
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return paramCallback();
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} catch (err) {
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return done(err);
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}
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}
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// single param callbacks
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function paramCallback(err) {
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var fn = paramCallbacks[paramIndex++];
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// store updated value
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paramCalled.value = req.params[key.name];
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if (err) {
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// store error
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paramCalled.error = err;
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param(err);
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return;
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}
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if (!fn) return param();
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fn(req, res, paramCallback, paramVal, key.name);
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}
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param();
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};
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/**
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* Use the given middleware function, with optional path, defaulting to "/".
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*
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* Use (like `.all`) will run for any http METHOD, but it will not add
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* handlers for those methods so OPTIONS requests will not consider `.use`
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* functions even if they could respond.
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*
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* The other difference is that _route_ path is stripped and not visible
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* to the handler function. The main effect of this feature is that mounted
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* handlers can operate without any code changes regardless of the "prefix"
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* pathname.
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*
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* @param {String|Function} route
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* @param {Function} fn
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* @return {app} for chaining
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* @api public
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*/
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proto.use = function(route, fn){
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// default route to '/'
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if ('string' != typeof route) {
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fn = route;
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route = '/';
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}
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if (typeof fn !== 'function') {
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var type = {}.toString.call(fn);
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var msg = 'Router.use() requires callback functions but got a ' + type;
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throw new Error(msg);
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}
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// strip trailing slash
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if ('/' == route[route.length - 1]) {
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route = route.slice(0, -1);
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}
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var layer = new Layer(route, {
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sensitive: this.caseSensitive,
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strict: this.strict,
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end: false
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}, fn);
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// add the middleware
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debug('use %s %s', route || '/', fn.name || 'anonymous');
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this.stack.push(layer);
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return this;
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};
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/**
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* Create a new Route for the given path.
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*
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* Each route contains a separate middleware stack and VERB handlers.
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*
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* See the Route api documentation for details on adding handlers
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* and middleware to routes.
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*
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* @param {String} path
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* @return {Route}
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* @api public
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*/
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proto.route = function(path){
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var route = new Route(path);
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var layer = new Layer(path, {
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sensitive: this.caseSensitive,
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strict: this.strict,
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end: true
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}, route.dispatch.bind(route));
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layer.route = route;
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this.stack.push(layer);
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return route;
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};
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// create Router#VERB functions
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methods.concat('all').forEach(function(method){
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proto[method] = function(path){
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var route = this.route(path)
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route[method].apply(route, [].slice.call(arguments, 1));
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return this;
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};
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});
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