Code cleaned and modules renamed

*Radicale is probably broken now*

radicale/auth/courier.py

@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Radicale Server - Calendar Server
+# Copyright © 2011 Henry-Nicolas Tourneur
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Courier-Authdaemon authentication.
+
+"""
+
+import sys
+import socket
+
+from radicale import config, log
+
+
+COURIER_SOCKET = config.get("auth", "courier_socket")
+
+
+def is_authenticated(user, password):
+    """Check if ``user``/``password`` couple is valid."""
+
+    line = "%s\nlogin\n%s\n%s" % (sys.argv[0], user, password)
+    line = "AUTH %i\n%s" % (len(line), line)
+    try:
+        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        sock.connect(COURIER_SOCKET)
+        log.LOGGER.debug("Sending to Courier socket the request: %s" % line)
+        sock.send(line)
+        data = sock.recv(1024)
+        sock.close()
+    except socket.error as exception:
+        log.LOGGER.debug(
+            "Unable to communicate with Courier socket: %s" % exception)
+        return False
+
+    log.LOGGER.debug("Got Courier socket response: %r" % data)
+
+    # Address, HOME, GID, and either UID or USERNAME are mandatory in resposne
+    # see http://www.courier-mta.org/authlib/README_authlib.html#authpipeproto
+    for line in data.split():
+        if "GID" in line:
+            return True
+
+    # default is reject
+    # this alleviates the problem of a possibly empty reply from authlib
+    # see http://www.courier-mta.org/authlib/README_authlib.html#authpipeproto
+    return False