From 5ff91ec37e3d6e8dbf12b3a19a90be4569337c00 Mon Sep 17 00:00:00 2001
From: AJ ONeal <aj@daplie.com>
Date: Fri, 5 Aug 2016 18:11:19 -0400
Subject: [PATCH] most basic middleware function

---
 lib/middleware.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 lib/middleware.js

diff --git a/lib/middleware.js b/lib/middleware.js
new file mode 100644
index 0000000..13af19c
--- /dev/null
+++ b/lib/middleware.js
@@ -0,0 +1,31 @@
+'use strict';
+
+module.exports = function (le) {
+  return function () {
+    var prefix = le.acmeChallengePrefix; // /.well-known/acme-challenge/:token
+
+    return function (req, res, next) {
+      if (0 !== req.url.indexOf(prefix)) {
+        next();
+        return;
+      }
+
+      var key = req.url.slice(prefix.length);
+      var hostname = req.hostname || (req.headers.host || '').toLowerCase().replace(/:*/, '');
+
+      // TODO tpl copy?
+      le.challenger.getAsync(le, hostname, key).then(function (token) {
+        if (!token) {
+          res.status = 404;
+          res.send("Error: These aren't the tokens you're looking for. Move along.");
+          return;
+        }
+
+        res.send(token);
+      }, function (/*err*/) {
+        res.status = 404;
+        res.send("Error: These aren't the tokens you're looking for. Move along.");
+      });
+    };
+  };
+};