152 lines
2.6 KiB
JavaScript
152 lines
2.6 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var pathRegexp = require('path-to-regexp');
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var debug = require('debug')('express:router:layer');
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/**
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* Expose `Layer`.
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*/
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module.exports = Layer;
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function Layer(path, options, fn) {
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if (!(this instanceof Layer)) {
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return new Layer(path, options, fn);
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}
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debug('new %s', path);
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options = options || {};
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this.handle = fn;
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this.name = fn.name || '<anonymous>';
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this.params = undefined;
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this.path = undefined;
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this.regexp = pathRegexp(path, this.keys = [], options);
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if (path === '/' && options.end === false) {
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this.regexp.fast_slash = true;
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}
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}
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/**
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* Handle the error for the layer.
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*
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* @param {Error} error
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* @param {Request} req
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* @param {Response} res
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* @param {function} next
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* @api private
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*/
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Layer.prototype.handle_error = function handle_error(error, req, res, next) {
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var fn = this.handle;
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if (fn.length !== 4) {
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// not a standard error handler
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return next(error);
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}
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try {
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fn(error, req, res, next);
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} catch (err) {
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next(err);
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}
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};
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/**
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* Handle the request for the layer.
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*
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* @param {Request} req
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* @param {Response} res
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* @param {function} next
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* @api private
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*/
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Layer.prototype.handle_request = function handle(req, res, next) {
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var fn = this.handle;
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if (fn.length > 3) {
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// not a standard request handler
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return next();
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}
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try {
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fn(req, res, next);
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} catch (err) {
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next(err);
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}
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};
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/**
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* Check if this route matches `path`, if so
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* populate `.params`.
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*
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* @param {String} path
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* @return {Boolean}
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* @api private
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*/
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Layer.prototype.match = function match(path) {
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if (this.regexp.fast_slash) {
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// fast path non-ending match for / (everything matches)
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this.params = {};
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this.path = '';
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return true;
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}
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var m = this.regexp.exec(path);
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if (!m) {
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this.params = undefined;
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this.path = undefined;
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return false;
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}
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// store values
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this.params = {};
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this.path = m[0];
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var keys = this.keys;
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var params = this.params;
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var n = 0;
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var key;
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var val;
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for (var i = 1, len = m.length; i < len; ++i) {
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key = keys[i - 1];
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val = decode_param(m[i]);
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if (key) {
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params[key.name] = val;
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} else {
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params[n++] = val;
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}
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}
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return true;
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};
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/**
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* Decode param value.
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*
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* @param {string} val
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* @return {string}
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* @api private
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*/
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function decode_param(val){
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if (typeof val !== 'string') {
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return val;
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}
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try {
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return decodeURIComponent(val);
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} catch (e) {
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var err = new TypeError("Failed to decode param '" + val + "'");
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err.status = 400;
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throw err;
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}
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}
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