From 51eeb1be55c25539702278e07561206d13c383c8 Mon Sep 17 00:00:00 2001
From: Zaid Abdulla <zkam83@gmail.com>
Date: Sun, 28 Jul 2013 09:26:04 +0300
Subject: [PATCH] Missing file from last commit

---
 auth.coffee | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 auth.coffee

diff --git a/auth.coffee b/auth.coffee
new file mode 100644
index 0000000..90eb54a
--- /dev/null
+++ b/auth.coffee
@@ -0,0 +1,58 @@
+crypto = require 'crypto'
+
+
+exports.parseAuthHeader = (authHeader) ->
+  res = {}
+  i = authHeader.indexOf(' ')
+  res['method'] = authHeader.slice(0, i)
+  options = authHeader.slice(i + 1).split(/\s*,\s*/)
+  
+  for o in options
+    v = o.split('=')
+    res[v[0]] = v[1].slice(1, -1)
+  return res
+
+
+exports.basic = (username, password) ->
+  "Basic #{new Buffer('Aladdin:open sesame').toString('base64')}"
+
+
+exports.digest = (username, password, uri, httpMethod, body, authHeader) ->
+  cnonce = '0a4f113b'
+  nc = '00000001'
+
+  if authHeader.qop?
+    if authHeader.qop.indexOf(',') != -1
+      qop = 'auth' # either auth or auth-int. prefer auth
+    else
+      qop = authHeader.qop
+
+  ha1 = crypto.createHash('md5')
+  ha1.update(username).update(':').update(authHeader.realm).update(':').update(password)
+  # TODO support "MD5-sess" algorithm directive
+  ha1 = ha1.digest('hex')
+
+  ha2 = crypto.createHash('md5')
+  ha2.update(httpMethod).update(':').update(uri)
+  if qop == 'auth-int'
+    ha2.update(':').update(body)
+  ha2 = ha2.digest('hex')
+
+  response = crypto.createHash('md5')
+  response.update(ha1).update(':').update(authHeader.nonce)
+
+  if authHeader.qop?
+    response.update(':').update(nc).update(':').update(cnonce).update(':').update(authHeader.qop)
+  response.update(':').update(ha2)
+  response = response.digest('hex')
+
+  authString = "Digest username=\"#{username}\""
+  authString += ",realm=\"#{authHeader.realm}\""
+  authString += ",nonce=\"#{authHeader.nonce}\""
+  authString += ",uri=\"#{uri}\""
+  authString += ",qop=\"#{qop}\""
+  authString += ",nc=\"#{nc}\""
+  authString += ",cnonce=\"#{cnonce}\""
+  authString += ",response=\"#{response}\""
+  authString += ",opaque=\"#{authHeader.opaque}\""
+  return authString