added hawk.py

hawk.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python2
+#
+# This module lets you create a header for your Hawk authentification.
+#
+# Usage:
+#
+# import hawk
+# print hawk.mkheader("https://example.com/foo/bar?baz=bum#test", "get", "1234", "5678", "abcdef")
+#
+# License: This script is public domain.
+# Copyright: 2013 Jeena Paradies
+#
+
+import string, random, time, datetime, hmac, hashlib, base64
+from urlparse import urlparse
+
+def mkheader(url, http_method, hawk_id, key, app_id=None):
+
+	nonce = mknonce(8)
+	parsed_url = urlparse(url)
+
+	n = datetime.datetime.now()
+	time_stamp = str(time.mktime(n.timetuple()))
+
+	port = parsed_url.port
+	if not port:
+		if parsed_url.scheme == "https":
+			port = "443"
+		else:
+			port = "80"
+
+	fragment = ""
+	if parsed_url.fragment:
+		fragment = "#" + parsed_url.fragment
+
+	normalized_string = "hawk.1.header\n"\
+		+ time_stamp + "\n"\
+		+ nonce + "\n"\
+		+ http_method.upper() + "\n"\
+		+ parsed_url.path + parsed_url.query + fragment + "\n"\
+		+ parsed_url.hostname.lower() + "\n"\
+		+ str(port) + "\n"\
+		+ "\n\n" # we don't use payload yet and we don't use ext
+
+	app = ""
+
+	if app_id:
+		app = ", app=\"" + app_id + "\"" # we need this later in the header
+		normalized_string += app_id + "\n\n" # adding app_id to the string and delegate should be empty
+
+	mac = base64.encodestring(hmac.new(key, normalized_string, hashlib.sha256).digest())
+
+	return 'Hawk id="' + hawk_id + '", mac="' + mac + '", ts="' + time_stamp + '", nonce="' + nonce + '"' + app
+
+def mknonce(length=6, chars=(string.ascii_uppercase + string.digits)):
+	return ''.join(random.choice(chars) for x in range(length))
+
+if __name__ == "__main__":
+	print mkheader("https://example.com/foo/bar?baz=bum#test", "get", "1234", "5678", "abcdef")