316 lines
11 KiB
Python
316 lines
11 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 © 2008-2011 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 a WSGI application class.
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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 pprint
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import base64
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import socket
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import ssl
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import wsgiref.simple_server
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# Manage Python2/3 different modules
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# pylint: disable=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=F0401
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from radicale import acl, config, ical, log, xmlutils
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VERSION = "git"
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class HTTPServer(wsgiref.simple_server.WSGIServer, object):
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"""HTTP server."""
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def __init__(self, address, handler, bind_and_activate=True):
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"""Create server."""
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ipv6 = ":" in address[0]
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if ipv6:
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self.address_family = socket.AF_INET6
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# Do not bind and activate, as we might change socket options
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super(HTTPServer, self).__init__(address, handler, False)
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if ipv6:
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# Only allow IPv6 connections to the IPv6 socket
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self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
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if bind_and_activate:
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self.server_bind()
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self.server_activate()
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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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super(HTTPSServer, self).__init__(address, handler, False)
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self.socket = ssl.wrap_socket(
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self.socket,
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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 RequestHandler(wsgiref.simple_server.WSGIRequestHandler):
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"""HTTP requests handler."""
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def log_message(self, *args, **kwargs):
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"""Disable inner logging management."""
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class Application(object):
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"""WSGI application managing calendars."""
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def __init__(self):
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"""Initialize application."""
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super(Application, self).__init__()
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self.acl = acl.load()
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self.encoding = config.get("encoding", "request")
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if config.getboolean('logging', 'full_environment'):
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self.headers_log = lambda environ: environ
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def headers_log(self, environ):
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request_environ = dict(environ)
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for shell_variable in os.environ:
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#if shell_variable not in request_environ:
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# continue
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del request_environ[shell_variable]
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return request_environ
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def decode(self, text, environ):
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"""Try to magically decode ``text`` according to given ``environ``."""
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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 = environ.get("CONTENT_TYPE")
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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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def __call__(self, environ, start_response):
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"""Manage a request."""
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log.LOGGER.info("%s request at %s received" % (
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environ["REQUEST_METHOD"], environ["PATH_INFO"]))
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headers = pprint.pformat(self.headers_log(environ))
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log.LOGGER.debug("Request headers:\n%s" % headers)
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# Get content
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content_length = int(environ.get("CONTENT_LENGTH") or 0)
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if content_length:
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content = self.decode(
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environ["wsgi.input"].read(content_length), environ)
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log.LOGGER.debug("Request content:\n%s" % content)
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else:
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content = None
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# Find calendar
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attributes = posixpath.normpath(
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environ["PATH_INFO"].strip("/")).split("/")
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if attributes:
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if attributes[-1].endswith(".ics"):
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attributes.pop()
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path = "/".join(attributes[:min(len(attributes), 2)])
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calendar = ical.Calendar(path)
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else:
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calendar = None
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# Get function corresponding to method
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function = getattr(self, environ["REQUEST_METHOD"].lower())
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# Check rights
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if not calendar or not self.acl:
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# No calendar or no acl, don't check rights
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status, headers, answer = function(environ, calendar, content)
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elif calendar.owner is None and config.getboolean("acl", "personal"):
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# No owner and personal calendars, don't check rights
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status, headers, answer = function(environ, calendar, content)
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else:
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# Ask authentication backend to check rights
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log.LOGGER.info(
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"Checking rights for calendar owned by %s" % calendar.owner)
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authorization = environ.get("HTTP_AUTHORIZATION", None)
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if authorization:
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auth = authorization.lstrip("Basic").strip().encode("ascii")
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user, password = self.decode(
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base64.b64decode(auth), environ).split(":")
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else:
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user = password = None
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if self.acl.has_right(calendar.owner, user, password):
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log.LOGGER.info("%s allowed" % (user or "anonymous user"))
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status, headers, answer = function(environ, calendar, content)
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else:
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log.LOGGER.info("%s refused" % (user or "anonymous user"))
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status = client.UNAUTHORIZED
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headers = {
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"WWW-Authenticate":
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"Basic realm=\"Radicale Server - Password Required\""}
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answer = None
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# Set content length
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if answer:
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log.LOGGER.debug(
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"Response content:\n%s" % self.decode(answer, environ))
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headers["Content-Length"] = str(len(answer))
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# Start response
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status = "%i %s" % (status, client.responses.get(status, ""))
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start_response(status, list(headers.items()))
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# Return response content
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return [answer] if answer else []
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# All these functions must have the same parameters, some are useless
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# pylint: disable=W0612,W0613,R0201
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def get(self, environ, calendar, content):
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"""Manage GET request."""
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item_name = xmlutils.name_from_path(environ["PATH_INFO"], calendar)
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if item_name:
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# Get calendar item
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item = calendar.get_item(item_name)
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if item:
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items = calendar.timezones
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items.append(item)
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answer_text = ical.serialize(
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headers=calendar.headers, items=items)
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etag = item.etag
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else:
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return client.GONE, {}, None
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else:
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# Get whole calendar
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answer_text = calendar.text
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etag = calendar.etag
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headers = {
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"Content-Type": "text/calendar",
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"Last-Modified": calendar.last_modified,
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"ETag": etag}
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answer = answer_text.encode(self.encoding)
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return client.OK, headers, answer
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def head(self, environ, calendar, content):
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"""Manage HEAD request."""
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status, headers, answer = self.get(environ, calendar, content)
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return status, headers, None
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def delete(self, environ, calendar, content):
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"""Manage DELETE request."""
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item = calendar.get_item(
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xmlutils.name_from_path(environ["PATH_INFO"], calendar))
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if item and environ.get("HTTP_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(environ["PATH_INFO"], calendar)
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status = client.NO_CONTENT
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else:
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# No item or ETag precondition not verified, do not delete item
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answer = None
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status = client.PRECONDITION_FAILED
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return status, {}, answer
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def mkcalendar(self, environ, calendar, content):
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"""Manage MKCALENDAR request."""
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return client.CREATED, {}, None
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def options(self, environ, calendar, content):
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"""Manage OPTIONS request."""
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headers = {
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"Allow": "DELETE, HEAD, GET, MKCALENDAR, " \
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"OPTIONS, PROPFIND, PROPPATCH, PUT, REPORT",
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"DAV": "1, calendar-access"}
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return client.OK, headers, None
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def propfind(self, environ, calendar, content):
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"""Manage PROPFIND request."""
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headers = {
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"DAV": "1, calendar-access",
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"Content-Type": "text/xml"}
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answer = xmlutils.propfind(
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environ["PATH_INFO"], content, calendar,
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environ.get("HTTP_DEPTH", "infinity"))
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return client.MULTI_STATUS, headers, answer
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def proppatch(self, environ, calendar, content):
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"""Manage PROPPATCH request."""
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xmlutils.proppatch(environ["PATH_INFO"], content, calendar)
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headers = {
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"DAV": "1, calendar-access",
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"Content-Type": "text/xml"}
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return client.MULTI_STATUS, headers, None
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def put(self, environ, calendar, content):
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"""Manage PUT request."""
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headers = {}
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item_name = xmlutils.name_from_path(environ["PATH_INFO"], calendar)
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item = calendar.get_item(item_name)
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if (not item and not environ.get("HTTP_IF_MATCH")) or (
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item and environ.get("HTTP_IF_MATCH", item.etag) == item.etag):
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# PUT allowed in 3 cases
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# Case 1: No item and no ETag precondition: Add new item
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# Case 2: Item and ETag precondition verified: Modify item
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# Case 3: Item and no Etag precondition: Force modifying item
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xmlutils.put(environ["PATH_INFO"], content, calendar)
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status = client.CREATED
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headers["ETag"] = calendar.get_item(item_name).etag
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else:
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# PUT rejected in all other cases
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status = client.PRECONDITION_FAILED
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return status, headers, None
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def report(self, environ, calendar, content):
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"""Manage REPORT request."""
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headers = {'Content-Type': 'text/xml'}
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answer = xmlutils.report(environ["PATH_INFO"], content, calendar)
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return client.MULTI_STATUS, headers, answer
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# pylint: enable=W0612,W0613,R0201
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