83 lines
1.5 KiB
JavaScript
83 lines
1.5 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var debug = require('debug')('express-urlrewrite');
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var toRegexp = require('path-to-regexp');
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var URL = require('url');
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/**
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* Expose `expose`.
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*/
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module.exports = rewrite;
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/**
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* Rewrite `src` to `dst`.
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*
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* @param {String|RegExp} src
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* @param {String} dst
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* @return {Function}
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* @api public
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*/
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function rewrite(src, dst) {
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var keys = [], re, map;
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if (dst) {
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re = toRegexp(src, keys);
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map = toMap(keys);
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debug('rewrite %s -> %s %s', src, dst, re);
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} else {
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debug('rewrite current route -> %s', src);
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}
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return function(req, res, next) {
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var orig = req.url;
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var m;
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if (dst) {
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m = re.exec(orig);
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if (!m) {
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return next();
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}
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}
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req.url = req.originalUrl = (dst || src).replace(/\$(\d+)|(?::(\w+))/g, function(_, n, name) {
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if (name) {
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if (m) return m[map[name].index + 1];
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else return req.params[name];
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} else if (m) {
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return m[n];
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} else {
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return req.params[n];
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}
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});
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debug('rewrite %s -> %s', orig, req.url);
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if (req.url.indexOf('?') > 0) {
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req.query = URL.parse(req.url, true).query;
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debug('rewrite updated new query', req.query);
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}
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if (dst) next();
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else next('route');
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}
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}
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/**
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* Turn params array into a map for quick lookup.
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*
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* @param {Array} params
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* @return {Object}
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* @api private
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*/
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function toMap(params) {
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var map = {};
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params.forEach(function(param, i) {
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param.index = i;
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map[param.name] = param;
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});
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return map;
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}
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