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216 lines
4.1 KiB
216 lines
4.1 KiB
/*!
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* express
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* Copyright(c) 2009-2013 TJ Holowaychuk
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* Copyright(c) 2013 Roman Shtylman
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* Copyright(c) 2014-2015 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict';
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/**
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* Module dependencies.
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* @private
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*/
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var debug = require('debug')('express:router:route');
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var flatten = require('array-flatten');
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var Layer = require('./layer');
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var methods = require('methods');
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/**
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* Module variables.
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* @private
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*/
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var slice = Array.prototype.slice;
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var toString = Object.prototype.toString;
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/**
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* Module exports.
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* @public
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*/
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module.exports = Route;
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/**
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* Initialize `Route` with the given `path`,
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*
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* @param {String} path
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* @public
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*/
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function Route(path) {
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this.path = path;
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this.stack = [];
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debug('new %o', path)
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// route handlers for various http methods
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this.methods = {};
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}
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/**
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* Determine if the route handles a given method.
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* @private
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*/
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Route.prototype._handles_method = function _handles_method(method) {
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if (this.methods._all) {
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return true;
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}
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var name = method.toLowerCase();
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if (name === 'head' && !this.methods['head']) {
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name = 'get';
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}
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return Boolean(this.methods[name]);
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};
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/**
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* @return {Array} supported HTTP methods
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* @private
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*/
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Route.prototype._options = function _options() {
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var methods = Object.keys(this.methods);
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// append automatic head
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if (this.methods.get && !this.methods.head) {
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methods.push('head');
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}
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for (var i = 0; i < methods.length; i++) {
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// make upper case
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methods[i] = methods[i].toUpperCase();
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}
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return methods;
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};
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/**
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* dispatch req, res into this route
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* @private
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*/
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Route.prototype.dispatch = function dispatch(req, res, done) {
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var idx = 0;
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var stack = this.stack;
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if (stack.length === 0) {
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return done();
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}
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var method = req.method.toLowerCase();
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if (method === 'head' && !this.methods['head']) {
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method = 'get';
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}
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req.route = this;
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next();
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function next(err) {
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// signal to exit route
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if (err && err === 'route') {
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return done();
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}
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// signal to exit router
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if (err && err === 'router') {
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return done(err)
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}
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var layer = stack[idx++];
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if (!layer) {
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return done(err);
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}
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if (layer.method && layer.method !== method) {
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return next(err);
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}
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if (err) {
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layer.handle_error(err, req, res, next);
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} else {
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layer.handle_request(req, res, next);
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}
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}
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};
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/**
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* Add a handler for all HTTP verbs to this route.
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*
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* Behaves just like middleware and can respond or call `next`
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* to continue processing.
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*
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* You can use multiple `.all` call to add multiple handlers.
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*
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* function check_something(req, res, next){
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* next();
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* };
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*
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* function validate_user(req, res, next){
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* next();
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* };
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*
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* route
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* .all(validate_user)
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* .all(check_something)
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* .get(function(req, res, next){
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* res.send('hello world');
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* });
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*
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* @param {function} handler
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* @return {Route} for chaining
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* @api public
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*/
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Route.prototype.all = function all() {
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var handles = flatten(slice.call(arguments));
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for (var i = 0; i < handles.length; i++) {
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var handle = handles[i];
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if (typeof handle !== 'function') {
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var type = toString.call(handle);
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var msg = 'Route.all() requires a callback function but got a ' + type
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throw new TypeError(msg);
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}
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var layer = Layer('/', {}, handle);
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layer.method = undefined;
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this.methods._all = true;
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this.stack.push(layer);
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}
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return this;
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};
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methods.forEach(function(method){
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Route.prototype[method] = function(){
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var handles = flatten(slice.call(arguments));
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for (var i = 0; i < handles.length; i++) {
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var handle = handles[i];
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if (typeof handle !== 'function') {
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var type = toString.call(handle);
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var msg = 'Route.' + method + '() requires a callback function but got a ' + type
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throw new Error(msg);
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}
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debug('%s %o', method, this.path)
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var layer = Layer('/', {}, handle);
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layer.method = method;
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this.methods[method] = true;
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this.stack.push(layer);
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}
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return this;
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};
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});
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