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/**
* Module dependencies.
*/
var debug = require('debug')('express:router:route');
var Layer = require('./layer');
var methods = require('methods');
var utils = require('../utils');
/**
* Expose `Route`.
*/
module.exports = Route;
/**
* Initialize `Route` with the given `path`,
*
* @param {String} path
* @api private
*/
function Route(path) {
debug('new %s', path);
this.path = path;
this.stack = [];
// route handlers for various http methods
this.methods = {};
}
/**
* @api private
*/
Route.prototype._handles_method = function _handles_method(method) {
if (this.methods._all) {
return true;
}
method = method.toLowerCase();
if (method === 'head' && !this.methods['head']) {
method = 'get';
}
return Boolean(this.methods[method]);
};
/**
* @return {Array} supported HTTP methods
* @api private
*/
Route.prototype._options = function _options() {
var methods = Object.keys(this.methods);
// append automatic head
if (this.methods.get && !this.methods.head) {
methods.push('head');
}
for (var i = 0; i < methods.length; i++) {
// make upper case
methods[i] = methods[i].toUpperCase();
}
return methods;
};
/**
* dispatch req, res into this route
*
* @api private
*/
Route.prototype.dispatch = function(req, res, done){
var idx = 0;
var stack = this.stack;
if (stack.length === 0) {
return done();
}
var method = req.method.toLowerCase();
if (method === 'head' && !this.methods['head']) {
method = 'get';
}
req.route = this;
next();
function next(err) {
if (err && err === 'route') {
return done();
}
var layer = stack[idx++];
if (!layer) {
return done(err);
}
if (layer.method && layer.method !== method) {
return next(err);
}
if (err) {
layer.handle_error(err, req, res, next);
} else {
layer.handle_request(req, res, next);
}
}
};
/**
* Add a handler for all HTTP verbs to this route.
*
* Behaves just like middleware and can respond or call `next`
* to continue processing.
*
* You can use multiple `.all` call to add multiple handlers.
*
* function check_something(req, res, next){
* next();
* };
*
* function validate_user(req, res, next){
* next();
* };
*
* route
* .all(validate_user)
* .all(check_something)
* .get(function(req, res, next){
* res.send('hello world');
* });
*
* @param {function} handler
* @return {Route} for chaining
* @api public
*/
Route.prototype.all = function(){
var callbacks = utils.flatten([].slice.call(arguments));
callbacks.forEach(function(fn) {
if (typeof fn !== 'function') {
var type = {}.toString.call(fn);
var msg = 'Route.all() requires callback functions but got a ' + type;
throw new Error(msg);
}
var layer = Layer('/', {}, fn);
layer.method = undefined;
this.methods._all = true;
this.stack.push(layer);
}, this);
return this;
};
methods.forEach(function(method){
Route.prototype[method] = function(){
var callbacks = utils.flatten([].slice.call(arguments));
callbacks.forEach(function(fn) {
if (typeof fn !== 'function') {
var type = {}.toString.call(fn);
var msg = 'Route.' + method + '() requires callback functions but got a ' + type;
throw new Error(msg);
}
debug('%s %s', method, this.path);
var layer = Layer('/', {}, fn);
layer.method = method;
this.methods[method] = true;
this.stack.push(layer);
}, this);
return this;
};
});
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