68 lines
1.4 KiB
JavaScript
68 lines
1.4 KiB
JavaScript
var URL = require('url')
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module.exports = function(/* fn1, fn2, ... */) {
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var handle = function (req, res, out) {
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var i = 0
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function next(err) {
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var layer = handle.layers[i++]
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if (!layer || res.headersSent) {
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// all done
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if (out) return out(err) // delegate to parent
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if (err && res.statusCode < 400) res.statusCode = err.status || 500
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else res.statusCode = 404
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return res.end()
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}
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try {
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layer(req, res, next)
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}
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catch (e) {
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next(e)
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}
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}
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next()
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}
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handle.layers = Array.prototype.slice.call(arguments)
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handle.use = function(fn) {
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if (typeof fn == 'object' && fn.handle) fn = fn.handle.bind(fn)
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handle.layers.push(fn)
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return this
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}
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handle.mount = function(path, fn) {
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return this.use(sub(path, fn))
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}
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return handle
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}
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function sub(mount, fn) {
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if (mount.substr(-1) != '/') mount += '/'
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if (typeof fn == 'object' && fn.handle) fn = fn.handle.bind(fn)
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return function(req, res, next) {
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var url = req.url
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, uri = req.uri
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if (url.substr(0, mount.length) !== mount && url.substr(0, mount.length) + '/' !== mount) return next()
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// modify the URL
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if (!req.realUrl) req.realUrl = url
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req.url = url.substr(mount.length-1)
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if (req.uri) req.uri = URL.parse(req.url)
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fn(req, res, function(err) {
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// reset the URL
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req.url = url
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req.uri = uri
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next(err)
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})
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}
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}
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