mirror of
https://github.com/denoland/deno.git
synced 2024-12-04 17:18:23 -05:00
664 lines
15 KiB
JavaScript
664 lines
15 KiB
JavaScript
|
/*!
|
||
|
* express
|
||
|
* Copyright(c) 2009-2013 TJ Holowaychuk
|
||
|
* Copyright(c) 2013 Roman Shtylman
|
||
|
* Copyright(c) 2014-2015 Douglas Christopher Wilson
|
||
|
* MIT Licensed
|
||
|
*/
|
||
|
|
||
|
'use strict';
|
||
|
|
||
|
/**
|
||
|
* Module dependencies.
|
||
|
* @private
|
||
|
*/
|
||
|
|
||
|
var Route = require('./route');
|
||
|
var Layer = require('./layer');
|
||
|
var methods = require('methods');
|
||
|
var mixin = require('utils-merge');
|
||
|
var debug = require('debug')('express:router');
|
||
|
var deprecate = require('depd')('express');
|
||
|
var flatten = require('array-flatten');
|
||
|
var parseUrl = require('parseurl');
|
||
|
var setPrototypeOf = require('setprototypeof')
|
||
|
|
||
|
/**
|
||
|
* Module variables.
|
||
|
* @private
|
||
|
*/
|
||
|
|
||
|
var objectRegExp = /^\[object (\S+)\]$/;
|
||
|
var slice = Array.prototype.slice;
|
||
|
var toString = Object.prototype.toString;
|
||
|
|
||
|
/**
|
||
|
* Initialize a new `Router` with the given `options`.
|
||
|
*
|
||
|
* @param {Object} [options]
|
||
|
* @return {Router} which is an callable function
|
||
|
* @public
|
||
|
*/
|
||
|
|
||
|
var proto = module.exports = function(options) {
|
||
|
var opts = options || {};
|
||
|
|
||
|
function router(req, res, next) {
|
||
|
router.handle(req, res, next);
|
||
|
}
|
||
|
|
||
|
// mixin Router class functions
|
||
|
setPrototypeOf(router, proto)
|
||
|
|
||
|
router.params = {};
|
||
|
router._params = [];
|
||
|
router.caseSensitive = opts.caseSensitive;
|
||
|
router.mergeParams = opts.mergeParams;
|
||
|
router.strict = opts.strict;
|
||
|
router.stack = [];
|
||
|
|
||
|
return router;
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Map the given param placeholder `name`(s) to the given callback.
|
||
|
*
|
||
|
* Parameter mapping is used to provide pre-conditions to routes
|
||
|
* which use normalized placeholders. For example a _:user_id_ parameter
|
||
|
* could automatically load a user's information from the database without
|
||
|
* any additional code,
|
||
|
*
|
||
|
* The callback uses the same signature as middleware, the only difference
|
||
|
* being that the value of the placeholder is passed, in this case the _id_
|
||
|
* of the user. Once the `next()` function is invoked, just like middleware
|
||
|
* it will continue on to execute the route, or subsequent parameter functions.
|
||
|
*
|
||
|
* Just like in middleware, you must either respond to the request or call next
|
||
|
* to avoid stalling the request.
|
||
|
*
|
||
|
* app.param('user_id', function(req, res, next, id){
|
||
|
* User.find(id, function(err, user){
|
||
|
* if (err) {
|
||
|
* return next(err);
|
||
|
* } else if (!user) {
|
||
|
* return next(new Error('failed to load user'));
|
||
|
* }
|
||
|
* req.user = user;
|
||
|
* next();
|
||
|
* });
|
||
|
* });
|
||
|
*
|
||
|
* @param {String} name
|
||
|
* @param {Function} fn
|
||
|
* @return {app} for chaining
|
||
|
* @public
|
||
|
*/
|
||
|
|
||
|
proto.param = function param(name, fn) {
|
||
|
// param logic
|
||
|
if (typeof name === 'function') {
|
||
|
deprecate('router.param(fn): Refactor to use path params');
|
||
|
this._params.push(name);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// apply param functions
|
||
|
var params = this._params;
|
||
|
var len = params.length;
|
||
|
var ret;
|
||
|
|
||
|
if (name[0] === ':') {
|
||
|
deprecate('router.param(' + JSON.stringify(name) + ', fn): Use router.param(' + JSON.stringify(name.substr(1)) + ', fn) instead');
|
||
|
name = name.substr(1);
|
||
|
}
|
||
|
|
||
|
for (var i = 0; i < len; ++i) {
|
||
|
if (ret = params[i](name, fn)) {
|
||
|
fn = ret;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// ensure we end up with a
|
||
|
// middleware function
|
||
|
if ('function' !== typeof fn) {
|
||
|
throw new Error('invalid param() call for ' + name + ', got ' + fn);
|
||
|
}
|
||
|
|
||
|
(this.params[name] = this.params[name] || []).push(fn);
|
||
|
return this;
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Dispatch a req, res into the router.
|
||
|
* @private
|
||
|
*/
|
||
|
|
||
|
proto.handle = function handle(req, res, out) {
|
||
|
var self = this;
|
||
|
|
||
|
debug('dispatching %s %s', req.method, req.url);
|
||
|
|
||
|
var idx = 0;
|
||
|
var protohost = getProtohost(req.url) || ''
|
||
|
var removed = '';
|
||
|
var slashAdded = false;
|
||
|
var paramcalled = {};
|
||
|
|
||
|
// store options for OPTIONS request
|
||
|
// only used if OPTIONS request
|
||
|
var options = [];
|
||
|
|
||
|
// middleware and routes
|
||
|
var stack = self.stack;
|
||
|
|
||
|
// manage inter-router variables
|
||
|
var parentParams = req.params;
|
||
|
var parentUrl = req.baseUrl || '';
|
||
|
var done = restore(out, req, 'baseUrl', 'next', 'params');
|
||
|
|
||
|
// setup next layer
|
||
|
req.next = next;
|
||
|
|
||
|
// for options requests, respond with a default if nothing else responds
|
||
|
if (req.method === 'OPTIONS') {
|
||
|
done = wrap(done, function(old, err) {
|
||
|
if (err || options.length === 0) return old(err);
|
||
|
sendOptionsResponse(res, options, old);
|
||
|
});
|
||
|
}
|
||
|
|
||
|
// setup basic req values
|
||
|
req.baseUrl = parentUrl;
|
||
|
req.originalUrl = req.originalUrl || req.url;
|
||
|
|
||
|
next();
|
||
|
|
||
|
function next(err) {
|
||
|
var layerError = err === 'route'
|
||
|
? null
|
||
|
: err;
|
||
|
|
||
|
// remove added slash
|
||
|
if (slashAdded) {
|
||
|
req.url = req.url.substr(1);
|
||
|
slashAdded = false;
|
||
|
}
|
||
|
|
||
|
// restore altered req.url
|
||
|
if (removed.length !== 0) {
|
||
|
req.baseUrl = parentUrl;
|
||
|
req.url = protohost + removed + req.url.substr(protohost.length);
|
||
|
removed = '';
|
||
|
}
|
||
|
|
||
|
// signal to exit router
|
||
|
if (layerError === 'router') {
|
||
|
setImmediate(done, null)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// no more matching layers
|
||
|
if (idx >= stack.length) {
|
||
|
setImmediate(done, layerError);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// get pathname of request
|
||
|
var path = getPathname(req);
|
||
|
|
||
|
if (path == null) {
|
||
|
return done(layerError);
|
||
|
}
|
||
|
|
||
|
// find next matching layer
|
||
|
var layer;
|
||
|
var match;
|
||
|
var route;
|
||
|
|
||
|
while (match !== true && idx < stack.length) {
|
||
|
layer = stack[idx++];
|
||
|
match = matchLayer(layer, path);
|
||
|
route = layer.route;
|
||
|
|
||
|
if (typeof match !== 'boolean') {
|
||
|
// hold on to layerError
|
||
|
layerError = layerError || match;
|
||
|
}
|
||
|
|
||
|
if (match !== true) {
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (!route) {
|
||
|
// process non-route handlers normally
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (layerError) {
|
||
|
// routes do not match with a pending error
|
||
|
match = false;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
var method = req.method;
|
||
|
var has_method = route._handles_method(method);
|
||
|
|
||
|
// build up automatic options response
|
||
|
if (!has_method && method === 'OPTIONS') {
|
||
|
appendMethods(options, route._options());
|
||
|
}
|
||
|
|
||
|
// don't even bother matching route
|
||
|
if (!has_method && method !== 'HEAD') {
|
||
|
match = false;
|
||
|
continue;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// no match
|
||
|
if (match !== true) {
|
||
|
return done(layerError);
|
||
|
}
|
||
|
|
||
|
// store route for dispatch on change
|
||
|
if (route) {
|
||
|
req.route = route;
|
||
|
}
|
||
|
|
||
|
// Capture one-time layer values
|
||
|
req.params = self.mergeParams
|
||
|
? mergeParams(layer.params, parentParams)
|
||
|
: layer.params;
|
||
|
var layerPath = layer.path;
|
||
|
|
||
|
// this should be done for the layer
|
||
|
self.process_params(layer, paramcalled, req, res, function (err) {
|
||
|
if (err) {
|
||
|
return next(layerError || err);
|
||
|
}
|
||
|
|
||
|
if (route) {
|
||
|
return layer.handle_request(req, res, next);
|
||
|
}
|
||
|
|
||
|
trim_prefix(layer, layerError, layerPath, path);
|
||
|
});
|
||
|
}
|
||
|
|
||
|
function trim_prefix(layer, layerError, layerPath, path) {
|
||
|
if (layerPath.length !== 0) {
|
||
|
// Validate path breaks on a path separator
|
||
|
var c = path[layerPath.length]
|
||
|
if (c && c !== '/' && c !== '.') return next(layerError)
|
||
|
|
||
|
// Trim off the part of the url that matches the route
|
||
|
// middleware (.use stuff) needs to have the path stripped
|
||
|
debug('trim prefix (%s) from url %s', layerPath, req.url);
|
||
|
removed = layerPath;
|
||
|
req.url = protohost + req.url.substr(protohost.length + removed.length);
|
||
|
|
||
|
// Ensure leading slash
|
||
|
if (!protohost && req.url[0] !== '/') {
|
||
|
req.url = '/' + req.url;
|
||
|
slashAdded = true;
|
||
|
}
|
||
|
|
||
|
// Setup base URL (no trailing slash)
|
||
|
req.baseUrl = parentUrl + (removed[removed.length - 1] === '/'
|
||
|
? removed.substring(0, removed.length - 1)
|
||
|
: removed);
|
||
|
}
|
||
|
|
||
|
debug('%s %s : %s', layer.name, layerPath, req.originalUrl);
|
||
|
|
||
|
if (layerError) {
|
||
|
layer.handle_error(layerError, req, res, next);
|
||
|
} else {
|
||
|
layer.handle_request(req, res, next);
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Process any parameters for the layer.
|
||
|
* @private
|
||
|
*/
|
||
|
|
||
|
proto.process_params = function process_params(layer, called, req, res, done) {
|
||
|
var params = this.params;
|
||
|
|
||
|
// captured parameters from the layer, keys and values
|
||
|
var keys = layer.keys;
|
||
|
|
||
|
// fast track
|
||
|
if (!keys || keys.length === 0) {
|
||
|
return done();
|
||
|
}
|
||
|
|
||
|
var i = 0;
|
||
|
var name;
|
||
|
var paramIndex = 0;
|
||
|
var key;
|
||
|
var paramVal;
|
||
|
var paramCallbacks;
|
||
|
var paramCalled;
|
||
|
|
||
|
// process params in order
|
||
|
// param callbacks can be async
|
||
|
function param(err) {
|
||
|
if (err) {
|
||
|
return done(err);
|
||
|
}
|
||
|
|
||
|
if (i >= keys.length ) {
|
||
|
return done();
|
||
|
}
|
||
|
|
||
|
paramIndex = 0;
|
||
|
key = keys[i++];
|
||
|
name = key.name;
|
||
|
paramVal = req.params[name];
|
||
|
paramCallbacks = params[name];
|
||
|
paramCalled = called[name];
|
||
|
|
||
|
if (paramVal === undefined || !paramCallbacks) {
|
||
|
return param();
|
||
|
}
|
||
|
|
||
|
// param previously called with same value or error occurred
|
||
|
if (paramCalled && (paramCalled.match === paramVal
|
||
|
|| (paramCalled.error && paramCalled.error !== 'route'))) {
|
||
|
// restore value
|
||
|
req.params[name] = paramCalled.value;
|
||
|
|
||
|
// next param
|
||
|
return param(paramCalled.error);
|
||
|
}
|
||
|
|
||
|
called[name] = paramCalled = {
|
||
|
error: null,
|
||
|
match: paramVal,
|
||
|
value: paramVal
|
||
|
};
|
||
|
|
||
|
paramCallback();
|
||
|
}
|
||
|
|
||
|
// single param callbacks
|
||
|
function paramCallback(err) {
|
||
|
var fn = paramCallbacks[paramIndex++];
|
||
|
|
||
|
// store updated value
|
||
|
paramCalled.value = req.params[key.name];
|
||
|
|
||
|
if (err) {
|
||
|
// store error
|
||
|
paramCalled.error = err;
|
||
|
param(err);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (!fn) return param();
|
||
|
|
||
|
try {
|
||
|
fn(req, res, paramCallback, paramVal, key.name);
|
||
|
} catch (e) {
|
||
|
paramCallback(e);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
param();
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Use the given middleware function, with optional path, defaulting to "/".
|
||
|
*
|
||
|
* Use (like `.all`) will run for any http METHOD, but it will not add
|
||
|
* handlers for those methods so OPTIONS requests will not consider `.use`
|
||
|
* functions even if they could respond.
|
||
|
*
|
||
|
* The other difference is that _route_ path is stripped and not visible
|
||
|
* to the handler function. The main effect of this feature is that mounted
|
||
|
* handlers can operate without any code changes regardless of the "prefix"
|
||
|
* pathname.
|
||
|
*
|
||
|
* @public
|
||
|
*/
|
||
|
|
||
|
proto.use = function use(fn) {
|
||
|
var offset = 0;
|
||
|
var path = '/';
|
||
|
|
||
|
// default path to '/'
|
||
|
// disambiguate router.use([fn])
|
||
|
if (typeof fn !== 'function') {
|
||
|
var arg = fn;
|
||
|
|
||
|
while (Array.isArray(arg) && arg.length !== 0) {
|
||
|
arg = arg[0];
|
||
|
}
|
||
|
|
||
|
// first arg is the path
|
||
|
if (typeof arg !== 'function') {
|
||
|
offset = 1;
|
||
|
path = fn;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
var callbacks = flatten(slice.call(arguments, offset));
|
||
|
|
||
|
if (callbacks.length === 0) {
|
||
|
throw new TypeError('Router.use() requires a middleware function')
|
||
|
}
|
||
|
|
||
|
for (var i = 0; i < callbacks.length; i++) {
|
||
|
var fn = callbacks[i];
|
||
|
|
||
|
if (typeof fn !== 'function') {
|
||
|
throw new TypeError('Router.use() requires a middleware function but got a ' + gettype(fn))
|
||
|
}
|
||
|
|
||
|
// add the middleware
|
||
|
debug('use %o %s', path, fn.name || '<anonymous>')
|
||
|
|
||
|
var layer = new Layer(path, {
|
||
|
sensitive: this.caseSensitive,
|
||
|
strict: false,
|
||
|
end: false
|
||
|
}, fn);
|
||
|
|
||
|
layer.route = undefined;
|
||
|
|
||
|
this.stack.push(layer);
|
||
|
}
|
||
|
|
||
|
return this;
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Create a new Route for the given path.
|
||
|
*
|
||
|
* Each route contains a separate middleware stack and VERB handlers.
|
||
|
*
|
||
|
* See the Route api documentation for details on adding handlers
|
||
|
* and middleware to routes.
|
||
|
*
|
||
|
* @param {String} path
|
||
|
* @return {Route}
|
||
|
* @public
|
||
|
*/
|
||
|
|
||
|
proto.route = function route(path) {
|
||
|
var route = new Route(path);
|
||
|
|
||
|
var layer = new Layer(path, {
|
||
|
sensitive: this.caseSensitive,
|
||
|
strict: this.strict,
|
||
|
end: true
|
||
|
}, route.dispatch.bind(route));
|
||
|
|
||
|
layer.route = route;
|
||
|
|
||
|
this.stack.push(layer);
|
||
|
return route;
|
||
|
};
|
||
|
|
||
|
// create Router#VERB functions
|
||
|
methods.concat('all').forEach(function(method){
|
||
|
proto[method] = function(path){
|
||
|
var route = this.route(path)
|
||
|
route[method].apply(route, slice.call(arguments, 1));
|
||
|
return this;
|
||
|
};
|
||
|
});
|
||
|
|
||
|
// append methods to a list of methods
|
||
|
function appendMethods(list, addition) {
|
||
|
for (var i = 0; i < addition.length; i++) {
|
||
|
var method = addition[i];
|
||
|
if (list.indexOf(method) === -1) {
|
||
|
list.push(method);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// get pathname of request
|
||
|
function getPathname(req) {
|
||
|
try {
|
||
|
return parseUrl(req).pathname;
|
||
|
} catch (err) {
|
||
|
return undefined;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Get get protocol + host for a URL
|
||
|
function getProtohost(url) {
|
||
|
if (typeof url !== 'string' || url.length === 0 || url[0] === '/') {
|
||
|
return undefined
|
||
|
}
|
||
|
|
||
|
var searchIndex = url.indexOf('?')
|
||
|
var pathLength = searchIndex !== -1
|
||
|
? searchIndex
|
||
|
: url.length
|
||
|
var fqdnIndex = url.substr(0, pathLength).indexOf('://')
|
||
|
|
||
|
return fqdnIndex !== -1
|
||
|
? url.substr(0, url.indexOf('/', 3 + fqdnIndex))
|
||
|
: undefined
|
||
|
}
|
||
|
|
||
|
// get type for error message
|
||
|
function gettype(obj) {
|
||
|
var type = typeof obj;
|
||
|
|
||
|
if (type !== 'object') {
|
||
|
return type;
|
||
|
}
|
||
|
|
||
|
// inspect [[Class]] for objects
|
||
|
return toString.call(obj)
|
||
|
.replace(objectRegExp, '$1');
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Match path to a layer.
|
||
|
*
|
||
|
* @param {Layer} layer
|
||
|
* @param {string} path
|
||
|
* @private
|
||
|
*/
|
||
|
|
||
|
function matchLayer(layer, path) {
|
||
|
try {
|
||
|
return layer.match(path);
|
||
|
} catch (err) {
|
||
|
return err;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// merge params with parent params
|
||
|
function mergeParams(params, parent) {
|
||
|
if (typeof parent !== 'object' || !parent) {
|
||
|
return params;
|
||
|
}
|
||
|
|
||
|
// make copy of parent for base
|
||
|
var obj = mixin({}, parent);
|
||
|
|
||
|
// simple non-numeric merging
|
||
|
if (!(0 in params) || !(0 in parent)) {
|
||
|
return mixin(obj, params);
|
||
|
}
|
||
|
|
||
|
var i = 0;
|
||
|
var o = 0;
|
||
|
|
||
|
// determine numeric gaps
|
||
|
while (i in params) {
|
||
|
i++;
|
||
|
}
|
||
|
|
||
|
while (o in parent) {
|
||
|
o++;
|
||
|
}
|
||
|
|
||
|
// offset numeric indices in params before merge
|
||
|
for (i--; i >= 0; i--) {
|
||
|
params[i + o] = params[i];
|
||
|
|
||
|
// create holes for the merge when necessary
|
||
|
if (i < o) {
|
||
|
delete params[i];
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return mixin(obj, params);
|
||
|
}
|
||
|
|
||
|
// restore obj props after function
|
||
|
function restore(fn, obj) {
|
||
|
var props = new Array(arguments.length - 2);
|
||
|
var vals = new Array(arguments.length - 2);
|
||
|
|
||
|
for (var i = 0; i < props.length; i++) {
|
||
|
props[i] = arguments[i + 2];
|
||
|
vals[i] = obj[props[i]];
|
||
|
}
|
||
|
|
||
|
return function () {
|
||
|
// restore vals
|
||
|
for (var i = 0; i < props.length; i++) {
|
||
|
obj[props[i]] = vals[i];
|
||
|
}
|
||
|
|
||
|
return fn.apply(this, arguments);
|
||
|
};
|
||
|
}
|
||
|
|
||
|
// send an OPTIONS response
|
||
|
function sendOptionsResponse(res, options, next) {
|
||
|
try {
|
||
|
var body = options.join(',');
|
||
|
res.set('Allow', body);
|
||
|
res.send(body);
|
||
|
} catch (err) {
|
||
|
next(err);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// wrap a function
|
||
|
function wrap(old, fn) {
|
||
|
return function proxy() {
|
||
|
var args = new Array(arguments.length + 1);
|
||
|
|
||
|
args[0] = old;
|
||
|
for (var i = 0, len = arguments.length; i < len; i++) {
|
||
|
args[i + 1] = arguments[i];
|
||
|
}
|
||
|
|
||
|
fn.apply(this, args);
|
||
|
};
|
||
|
}
|
||
|
if (false) undeclaredVariable.hasOwnProperty(); // Intentional error to force diagnostics.
|