Roughing out the demo app

node_modules/express-urlrewrite/index.js

@@ -0,0 +1,82 @@
+
+/**
+ * Module dependencies.
+ */
+
+ var debug = require('debug')('express-urlrewrite');
+ var toRegexp = require('path-to-regexp');
+ var URL = require('url');
+
+/**
+ * Expose `expose`.
+ */
+
+module.exports = rewrite;
+
+/**
+ * Rewrite `src` to `dst`.
+ *
+ * @param {String|RegExp} src
+ * @param {String} dst
+ * @return {Function}
+ * @api public
+ */
+
+function rewrite(src, dst) {
+  var keys = [], re, map;
+
+  if (dst) {
+    re = toRegexp(src, keys);
+    map = toMap(keys);
+    debug('rewrite %s -> %s    %s', src, dst, re);
+  } else {
+    debug('rewrite current route -> %s', src);
+  }
+
+  return function(req, res, next) {
+    var orig = req.url;
+    var m;
+    if (dst) {
+      m = re.exec(orig);
+      if (!m) {
+        return next();
+      }
+    }
+    req.url = (dst || src).replace(/\$(\d+)|(?::(\w+))/g, function(_, n, name) {
+      if (name) {
+        if (m) return m[map[name].index + 1];
+        else return req.params[name];
+      } else if (m) {
+        return m[n];
+      } else {
+        return req.params[n];
+      }
+    });
+    debug('rewrite %s -> %s', orig, req.url);
+    if (req.url.indexOf('?') > 0) {
+      req.query = URL.parse(req.url, true).query;
+      debug('rewrite updated new query', req.query);
+    }
+    if (dst) next();
+    else next('route');
+  }
+}
+
+/**
+ * Turn params array into a map for quick lookup.
+ *
+ * @param {Array} params
+ * @return {Object}
+ * @api private
+ */
+
+function toMap(params) {
+  var map = {};
+
+  params.forEach(function(param, i) {
+    param.index = i;
+    map[param.name] = param;
+  });
+
+  return map;
+}