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/*!
* Connect - router
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var utils = require('../utils')
, parse = require('url').parse;
/**
* Expose router.
*/
exports = module.exports = router;
/**
* Supported HTTP / WebDAV methods.
*/
var _methods = exports.methods = [
'get'
, 'post'
, 'put'
, 'delete'
, 'connect'
, 'options'
, 'trace'
, 'copy'
, 'lock'
, 'mkcol'
, 'move'
, 'propfind'
, 'proppatch'
, 'unlock'
, 'report'
, 'mkactivity'
, 'checkout'
, 'merge'
];
/**
* Provides Sinatra and Express-like routing capabilities.
*
* Examples:
*
* connect.router(function(app){
* app.get('/user/:id', function(req, res, next){
* // populates req.params.id
* });
* app.put('/user/:id', function(req, res, next){
* // populates req.params.id
* });
* })
*
* @param {Function} fn
* @return {Function}
* @api public
*/
function router(fn){
var self = this
, methods = {}
, routes = {}
, params = {};
if (!fn) throw new Error('router provider requires a callback function');
// Generate method functions
_methods.forEach(function(method){
methods[method] = generateMethodFunction(method.toUpperCase());
});
// Alias del -> delete
methods.del = methods.delete;
// Apply callback to all methods
methods.all = function(){
var args = arguments;
_methods.forEach(function(name){
methods[name].apply(this, args);
});
return self;
};
// Register param callback
methods.param = function(name, fn){
params[name] = fn;
};
fn.call(this, methods);
function generateMethodFunction(name) {
var localRoutes = routes[name] = routes[name] || [];
return function(path, fn){
var keys = []
, middleware = [];
// slice middleware
if (arguments.length > 2) {
middleware = Array.prototype.slice.call(arguments, 1, arguments.length);
fn = middleware.pop();
middleware = utils.flatten(middleware);
}
fn.middleware = middleware;
if (!path) throw new Error(name + ' route requires a path');
if (!fn) throw new Error(name + ' route ' + path + ' requires a callback');
var regexp = path instanceof RegExp
? path
: normalizePath(path, keys);
localRoutes.push({
fn: fn
, path: regexp
, keys: keys
, orig: path
, method: name
});
return self;
};
}
function router(req, res, next){
var route
, self = this;
(function pass(i){
if (route = match(req, routes, i)) {
var i = 0
, keys = route.keys;
req.params = route.params;
// Param preconditions
(function param(err) {
try {
var key = keys[i++]
, val = req.params[key]
, fn = params[key];
if ('route' == err) {
pass(req._route_index + 1);
// Error
} else if (err) {
next(err);
// Param has callback
} else if (fn) {
// Return style
if (1 == fn.length) {
req.params[key] = fn(val);
param();
// Middleware style
} else {
fn(req, res, param, val);
}
// Finished processing params
} else if (!key) {
// route middleware
i = 0;
(function nextMiddleware(err){
var fn = route.middleware[i++];
if ('route' == err) {
pass(req._route_index + 1);
} else if (err) {
next(err);
} else if (fn) {
fn(req, res, nextMiddleware);
} else {
route.call(self, req, res, function(err){
if (err) {
next(err);
} else {
pass(req._route_index + 1);
}
});
}
})();
// More params
} else {
param();
}
} catch (err) {
next(err);
}
})();
} else if ('OPTIONS' == req.method) {
options(req, res, routes);
} else {
next();
}
})();
};
router.remove = function(path, method){
var fns = router.lookup(path, method);
fns.forEach(function(fn){
routes[fn.method].splice(fn.index, 1);
});
};
router.lookup = function(path, method, ret){
ret = ret || [];
// method specific lookup
if (method) {
method = method.toUpperCase();
if (routes[method]) {
routes[method].forEach(function(route, i){
if (path == route.orig) {
var fn = route.fn;
fn.regexp = route.path;
fn.keys = route.keys;
fn.path = route.orig;
fn.method = route.method;
fn.index = i;
ret.push(fn);
}
});
}
// global lookup
} else {
_methods.forEach(function(method){
router.lookup(path, method, ret);
});
}
return ret;
};
router.match = function(url, method, ret){
var ret = ret || []
, i = 0
, fn
, req;
// method specific matches
if (method) {
method = method.toUpperCase();
req = { url: url, method: method };
while (fn = match(req, routes, i)) {
i = req._route_index + 1;
ret.push(fn);
}
// global matches
} else {
_methods.forEach(function(method){
router.match(url, method, ret);
});
}
return ret;
};
return router;
}
/**
* Respond to OPTIONS.
*
* @param {ServerRequest} req
* @param {ServerResponse} req
* @param {Array} routes
* @api private
*/
function options(req, res, routes) {
var pathname = parse(req.url).pathname
, body = optionsFor(pathname, routes).join(',');
res.writeHead(200, {
'Content-Length': body.length
, 'Allow': body
});
res.end(body);
}
/**
* Return OPTIONS array for the given `path`, matching `routes`.
*
* @param {String} path
* @param {Array} routes
* @return {Array}
* @api private
*/
function optionsFor(path, routes) {
return _methods.filter(function(method){
var arr = routes[method.toUpperCase()];
for (var i = 0, len = arr.length; i < len; ++i) {
if (arr[i].path.test(path)) return true;
}
}).map(function(method){
return method.toUpperCase();
});
}
/**
* Normalize the given path string,
* returning a regular expression.
*
* An empty array should be passed,
* which will contain the placeholder
* key names. For example "/user/:id" will
* then contain ["id"].
*
* @param {String} path
* @param {Array} keys
* @return {RegExp}
* @api private
*/
function normalizePath(path, keys) {
path = path
.concat('/?')
.replace(/\/\(/g, '(?:/')
.replace(/(\/)?(\.)?:(\w+)(?:(\(.*?\)))?(\?)?/g, function(_, slash, format, key, capture, optional){
keys.push(key);
slash = slash || '';
return ''
+ (optional ? '' : slash)
+ '(?:'
+ (optional ? slash : '')
+ (format || '') + (capture || '([^/]+?)') + ')'
+ (optional || '');
})
.replace(/([\/.])/g, '\\$1')
.replace(/\*/g, '(.+)');
return new RegExp('^' + path + '$', 'i');
}
/**
* Attempt to match the given request to
* one of the routes. When successful
* a route function is returned.
*
* @param {ServerRequest} req
* @param {Object} routes
* @return {Function}
* @api private
*/
function match(req, routes, i) {
var captures
, method = req.method
, i = i || 0;
if ('HEAD' == method) method = 'GET';
if (routes = routes[method]) {
var url = parse(req.url)
, pathname = url.pathname;
for (var len = routes.length; i < len; ++i) {
var route = routes[i]
, fn = route.fn
, path = route.path
, keys = fn.keys = route.keys;
if (captures = path.exec(pathname)) {
fn.method = method;
fn.params = [];
for (var j = 1, len = captures.length; j < len; ++j) {
var key = keys[j-1],
val = typeof captures[j] === 'string'
? decodeURIComponent(captures[j])
: captures[j];
if (key) {
fn.params[key] = val;
} else {
fn.params.push(val);
}
}
req._route_index = i;
return fn;
}
}
}
}