214 lines
7.4 KiB
Python
214 lines
7.4 KiB
Python
# -*- coding: utf-8 -*-
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#
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# This file is part of Radicale Server - Calendar Server
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# Copyright © 2008-2010 Guillaume Ayoub
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# Copyright © 2008 Nicolas Kandel
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# Copyright © 2008 Pascal Halter
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Radicale. If not, see <http://www.gnu.org/licenses/>.
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"""
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Radicale Server module.
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This module offers 3 useful classes:
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- ``HTTPServer`` is a simple HTTP server;
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- ``HTTPSServer`` is a HTTPS server, wrapping the HTTP server in a socket
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managing SSL connections;
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- ``CalendarHTTPHandler`` is a CalDAV request handler for HTTP(S) servers.
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To use this module, you should take a look at the file ``radicale.py`` that
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should have been included in this package.
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"""
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import os
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import posixpath
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import base64
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import socket
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# Manage Python2/3 different modules
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# pylint: disable-msg=F0401
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try:
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from http import client, server
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except ImportError:
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import httplib as client
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import BaseHTTPServer as server
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# pylint: enable-msg=F0401
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from radicale import acl, config, ical, xmlutils
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def _check(request, function):
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"""Check if user has sufficient rights for performing ``request``."""
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authorization = request.headers.get("Authorization", None)
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if authorization:
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challenge = authorization.lstrip("Basic").strip().encode("ascii")
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plain = request._decode(base64.b64decode(challenge))
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user, password = plain.split(":")
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else:
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user = password = None
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if request.server.acl.has_right(user, password):
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function(request)
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else:
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request.send_response(client.UNAUTHORIZED)
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request.send_header(
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"WWW-Authenticate",
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"Basic realm=\"Radicale Server - Password Required\"")
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request.end_headers()
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class HTTPServer(server.HTTPServer):
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"""HTTP server."""
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def __init__(self, address, handler):
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"""Create server."""
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server.HTTPServer.__init__(self, address, handler)
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self.acl = acl.load()
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class HTTPSServer(HTTPServer):
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"""HTTPS server."""
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def __init__(self, address, handler):
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"""Create server by wrapping HTTP socket in an SSL socket."""
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# Fails with Python 2.5, import if needed
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# pylint: disable-msg=F0401
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import ssl
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# pylint: enable-msg=F0401
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HTTPServer.__init__(self, address, handler)
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self.socket = ssl.wrap_socket(
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socket.socket(self.address_family, self.socket_type),
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server_side=True,
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certfile=config.get("server", "certificate"),
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keyfile=config.get("server", "key"),
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ssl_version=ssl.PROTOCOL_SSLv23)
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self.server_bind()
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self.server_activate()
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class CalendarHTTPHandler(server.BaseHTTPRequestHandler):
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"""HTTP requests handler for calendars."""
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_encoding = config.get("encoding", "request")
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# Decorator checking rights before performing request
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check_rights = lambda function: lambda request: _check(request, function)
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@property
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def _calendar(self):
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"""The ``ical.Calendar`` object corresponding to the given path."""
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# ``self.path`` must be something like a posix path
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# ``normpath`` should clean malformed and malicious request paths
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attributes = posixpath.normpath(self.path.strip("/")).split("/")
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if len(attributes) >= 2:
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path = "%s/%s" % (attributes[0], attributes[1])
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return ical.Calendar(path)
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def _decode(self, text):
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"""Try to decode text according to various parameters."""
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# List of charsets to try
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charsets = []
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# First append content charset given in the request
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content_type = self.headers.get("Content-Type", None)
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if content_type and "charset=" in content_type:
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charsets.append(content_type.split("charset=")[1].strip())
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# Then append default Radicale charset
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charsets.append(self._encoding)
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# Then append various fallbacks
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charsets.append("utf-8")
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charsets.append("iso8859-1")
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# Try to decode
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for charset in charsets:
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try:
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return text.decode(charset)
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except UnicodeDecodeError:
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pass
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raise UnicodeDecodeError
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# Naming methods ``do_*`` is OK here
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# pylint: disable-msg=C0103
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@check_rights
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def do_GET(self):
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"""Manage GET request."""
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answer = self._calendar.text.encode(self._encoding)
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self.send_response(client.OK)
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self.send_header("Content-Length", len(answer))
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self.end_headers()
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self.wfile.write(answer)
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@check_rights
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def do_DELETE(self):
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"""Manage DELETE request."""
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item = self._calendar.get_item(xmlutils.name_from_path(self.path))
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if item and self.headers.get("If-Match", item.etag) == item.etag:
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# No ETag precondition or precondition verified, delete item
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answer = xmlutils.delete(self.path, self._calendar)
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self.send_response(client.NO_CONTENT)
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self.send_header("Content-Length", len(answer))
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self.end_headers()
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self.wfile.write(answer)
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else:
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# No item or ETag precondition not verified, do not delete item
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self.send_response(client.PRECONDITION_FAILED)
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def do_OPTIONS(self):
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"""Manage OPTIONS request."""
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self.send_response(client.OK)
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self.send_header("Allow", "DELETE, GET, OPTIONS, PROPFIND, PUT, REPORT")
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self.send_header("DAV", "1, calendar-access")
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self.end_headers()
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def do_PROPFIND(self):
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"""Manage PROPFIND request."""
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xml_request = self.rfile.read(int(self.headers["Content-Length"]))
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answer = xmlutils.propfind(self.path, xml_request, self._calendar)
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self.send_response(client.MULTI_STATUS)
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self.send_header("DAV", "1, calendar-access")
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self.send_header("Content-Length", len(answer))
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self.end_headers()
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self.wfile.write(answer)
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@check_rights
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def do_PUT(self):
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"""Manage PUT request."""
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item = self._calendar.get_item(xmlutils.name_from_path(self.path))
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if not item or self.headers.get("If-Match", item.etag) == item.etag:
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# No item, no ETag precondition or precondition verified, put item
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ical_request = self._decode(
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self.rfile.read(int(self.headers["Content-Length"])))
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xmlutils.put(self.path, ical_request, self._calendar)
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self.send_response(client.CREATED)
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else:
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# ETag precondition not verified, do not put item
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self.send_response(client.PRECONDITION_FAILED)
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@check_rights
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def do_REPORT(self):
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"""Manage REPORT request."""
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xml_request = self.rfile.read(int(self.headers["Content-Length"]))
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answer = xmlutils.report(self.path, xml_request, self._calendar)
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self.send_response(client.MULTI_STATUS)
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self.send_header("Content-Length", len(answer))
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self.end_headers()
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self.wfile.write(answer)
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# pylint: enable-msg=C0103
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