# -*- coding: utf-8 -*-
#
# This file is part of Radicale Server - Calendar Server
# Copyright © 2008-2011 Guillaume Ayoub
# Copyright © 2008 Nicolas Kandel
# Copyright © 2008 Pascal Halter
#
# 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 .
"""
XML and iCal requests manager.
Note that all these functions need to receive unicode objects for full
iCal requests (PUT) and string objects with charset correctly defined
in them for XML requests (all but PUT).
"""
try:
from collections import OrderedDict
except ImportError:
# Python 2.6 has no OrderedDict, use a dict instead
OrderedDict = dict # pylint: disable=C0103
import re
import xml.etree.ElementTree as ET
from radicale import client, config, ical
NAMESPACES = {
"C": "urn:ietf:params:xml:ns:caldav",
"D": "DAV:",
"CS": "http://calendarserver.org/ns/",
"ICAL": "http://apple.com/ns/ical/",
"ME": "http://me.com/_namespace/"}
NAMESPACES_REV = {}
for short, url in NAMESPACES.items():
NAMESPACES_REV[url] = short
if hasattr(ET, "register_namespace"):
# Register namespaces cleanly with Python 2.7+ and 3.2+ ...
ET.register_namespace("" if short == "D" else short, url)
else:
# ... and badly with Python 2.6 and 3.1
ET._namespace_map[url] = short # pylint: disable=W0212
CLARK_TAG_REGEX = re.compile(r"""
{ # {
(?P[^}]*) # namespace URL
} # }
(?P.*) # short tag name
""", re.VERBOSE)
def _pretty_xml(element, level=0):
"""Indent an ElementTree ``element`` and its children."""
i = "\n" + level * " "
if len(element):
if not element.text or not element.text.strip():
element.text = i + " "
if not element.tail or not element.tail.strip():
element.tail = i
for sub_element in element:
_pretty_xml(sub_element, level + 1)
# ``sub_element`` is always defined as len(element) > 0
# pylint: disable=W0631
if not sub_element.tail or not sub_element.tail.strip():
sub_element.tail = i
# pylint: enable=W0631
else:
if level and (not element.tail or not element.tail.strip()):
element.tail = i
if not level:
output_encoding = config.get("encoding", "request")
return ('\n' + ET.tostring(
element, "utf-8").decode("utf-8")).encode(output_encoding)
def _tag(short_name, local):
"""Get XML Clark notation {uri(``short_name``)}``local``."""
return "{%s}%s" % (NAMESPACES[short_name], local)
def _tag_from_clark(name):
"""Get a human-readable variant of the XML Clark notation tag ``name``.
For a given name using the XML Clark notation, return a human-readable
variant of the tag name for known namespaces. Otherwise, return the name as
is.
"""
match = CLARK_TAG_REGEX.match(name)
if match and match.group('namespace') in NAMESPACES_REV:
args = {
'ns': NAMESPACES_REV[match.group('namespace')],
'tag': match.group('tag')}
return '%(ns)s:%(tag)s' % args
return name
def _response(code):
"""Return full W3C names from HTTP status codes."""
return "HTTP/1.1 %i %s" % (code, client.responses[code])
def name_from_path(path, calendar):
"""Return Radicale item name from ``path``."""
calendar_parts = calendar.local_path.strip("/").split("/")
path_parts = path.strip("/").split("/")
return path_parts[-1] if (len(path_parts) - len(calendar_parts)) else None
def props_from_request(root, actions=("set", "remove")):
"""Return a list of properties as a dictionary."""
result = OrderedDict()
if not hasattr(root, "tag"):
root = ET.fromstring(root.encode("utf8"))
for action in actions:
action_element = root.find(_tag("D", action))
if action_element is not None:
break
else:
action_element = root
prop_element = action_element.find(_tag("D", "prop"))
if prop_element is not None:
for prop in prop_element:
result[_tag_from_clark(prop.tag)] = prop.text
return result
def delete(path, calendar):
"""Read and answer DELETE requests.
Read rfc4918-9.6 for info.
"""
# Reading request
calendar.remove(name_from_path(path, calendar))
# Writing answer
multistatus = ET.Element(_tag("D", "multistatus"))
response = ET.Element(_tag("D", "response"))
multistatus.append(response)
href = ET.Element(_tag("D", "href"))
href.text = path
response.append(href)
status = ET.Element(_tag("D", "status"))
status.text = _response(200)
response.append(status)
return _pretty_xml(multistatus)
def propfind(path, xml_request, calendars, user=None):
"""Read and answer PROPFIND requests.
Read rfc4918-9.1 for info.
"""
# Reading request
root = ET.fromstring(xml_request.encode("utf8"))
prop_element = root.find(_tag("D", "prop"))
props = [prop.tag for prop in prop_element]
# Writing answer
multistatus = ET.Element(_tag("D", "multistatus"))
for calendar in calendars:
response = _propfind_response(path, calendar, props, user)
multistatus.append(response)
return _pretty_xml(multistatus)
def _propfind_response(path, item, props, user):
"""Build and return a PROPFIND response."""
is_calendar = isinstance(item, ical.Calendar)
if is_calendar:
with item.props as cal_props:
calendar_props = cal_props
response = ET.Element(_tag("D", "response"))
href = ET.Element(_tag("D", "href"))
uri = item.url if is_calendar else "%s/%s" % (path, item.name)
href.text = uri.replace("//", "/")
response.append(href)
propstat404 = ET.Element(_tag("D", "propstat"))
propstat200 = ET.Element(_tag("D", "propstat"))
response.append(propstat200)
prop200 = ET.Element(_tag("D", "prop"))
propstat200.append(prop200)
prop404 = ET.Element(_tag("D", "prop"))
propstat404.append(prop404)
for tag in props:
element = ET.Element(tag)
is404 = False
if tag == _tag("D", "getetag"):
element.text = item.etag
elif tag == _tag("D", "principal-URL"):
tag = ET.Element(_tag("D", "href"))
tag.text = path
element.append(tag)
elif tag in (
_tag("D", "principal-collection-set"),
_tag("C", "calendar-user-address-set"),
_tag("C", "calendar-home-set")):
tag = ET.Element(_tag("D", "href"))
tag.text = path
element.append(tag)
elif tag == _tag("C", "supported-calendar-component-set"):
# This is not a Todo
# pylint: disable=W0511
for component in ("VTODO", "VEVENT", "VJOURNAL"):
comp = ET.Element(_tag("C", "comp"))
comp.set("name", component)
element.append(comp)
# pylint: enable=W0511
elif tag == _tag("D", "current-user-principal") and user:
tag = ET.Element(_tag("D", "href"))
tag.text = '/%s/' % user
element.append(tag)
elif tag == _tag("D", "current-user-privilege-set"):
privilege = ET.Element(_tag("D", "privilege"))
privilege.append(ET.Element(_tag("D", "all")))
element.append(privilege)
elif tag == _tag("D", "supported-report-set"):
for report_name in (
"principal-property-search", "sync-collection"
"expand-property", "principal-search-property-set"):
supported = ET.Element(_tag("D", "supported-report"))
report_tag = ET.Element(_tag("D", "report"))
report_tag.text = report_name
supported.append(report_tag)
element.append(supported)
elif is_calendar:
if tag == _tag("D", "getcontenttype"):
element.text = "text/calendar"
elif tag == _tag("D", "resourcetype"):
if item.is_principal:
tag = ET.Element(_tag("D", "principal"))
element.append(tag)
else:
tag = ET.Element(_tag("C", "calendar"))
element.append(tag)
tag = ET.Element(_tag("D", "collection"))
element.append(tag)
elif tag == _tag("D", "owner") and item.owner_url:
element.text = item.owner_url
elif tag == _tag("CS", "getctag"):
element.text = item.etag
elif tag == _tag("C", "calendar-timezone"):
element.text = ical.serialize(item.headers, item.timezones)
else:
human_tag = _tag_from_clark(tag)
if human_tag in calendar_props:
element.text = calendar_props[human_tag]
else:
is404 = True
# Not for calendars
elif tag == _tag("D", "getcontenttype"):
element.text = "text/calendar; component=%s" % item.tag.lower()
elif tag == _tag("D", "resourcetype"):
# resourcetype must be returned empty for non-collection elements
pass
else:
is404 = True
if is404:
prop404.append(element)
else:
prop200.append(element)
status200 = ET.Element(_tag("D", "status"))
status200.text = _response(200)
propstat200.append(status200)
status404 = ET.Element(_tag("D", "status"))
status404.text = _response(404)
propstat404.append(status404)
if len(prop404):
response.append(propstat404)
return response
def _add_propstat_to(element, tag, status_number):
"""Add a PROPSTAT response structure to an element.
The PROPSTAT answer structure is defined in rfc4918-9.1. It is added to the
given ``element``, for the following ``tag`` with the given
``status_number``.
"""
propstat = ET.Element(_tag("D", "propstat"))
element.append(propstat)
prop = ET.Element(_tag("D", "prop"))
propstat.append(prop)
if '{' in tag:
clark_tag = tag
else:
clark_tag = _tag(*tag.split(':', 1))
prop_tag = ET.Element(clark_tag)
prop.append(prop_tag)
status = ET.Element(_tag("D", "status"))
status.text = _response(status_number)
propstat.append(status)
def proppatch(path, xml_request, calendar):
"""Read and answer PROPPATCH requests.
Read rfc4918-9.2 for info.
"""
# Reading request
root = ET.fromstring(xml_request.encode("utf8"))
props_to_set = props_from_request(root, actions=('set',))
props_to_remove = props_from_request(root, actions=('remove',))
# Writing answer
multistatus = ET.Element(_tag("D", "multistatus"))
response = ET.Element(_tag("D", "response"))
multistatus.append(response)
href = ET.Element(_tag("D", "href"))
href.text = path
response.append(href)
with calendar.props as calendar_props:
for short_name, value in props_to_set.items():
if short_name == 'C:calendar-timezone':
calendar.replace('', value)
calendar.write()
else:
calendar_props[short_name] = value
_add_propstat_to(response, short_name, 200)
for short_name in props_to_remove:
try:
del calendar_props[short_name]
except KeyError:
_add_propstat_to(response, short_name, 412)
else:
_add_propstat_to(response, short_name, 200)
return _pretty_xml(multistatus)
def put(path, ical_request, calendar):
"""Read PUT requests."""
name = name_from_path(path, calendar)
if name in (item.name for item in calendar.items):
# PUT is modifying an existing item
calendar.replace(name, ical_request)
else:
# PUT is adding a new item
calendar.append(name, ical_request)
def report(path, xml_request, calendar):
"""Read and answer REPORT requests.
Read rfc3253-3.6 for info.
"""
# Reading request
root = ET.fromstring(xml_request.encode("utf8"))
prop_element = root.find(_tag("D", "prop"))
props = [prop.tag for prop in prop_element]
if calendar:
if root.tag == _tag("C", "calendar-multiget"):
# Read rfc4791-7.9 for info
hreferences = set(
href_element.text for href_element
in root.findall(_tag("D", "href")))
else:
hreferences = (path,)
else:
hreferences = ()
# Writing answer
multistatus = ET.Element(_tag("D", "multistatus"))
for hreference in hreferences:
# Check if the reference is an item or a calendar
name = name_from_path(hreference, calendar)
if name:
# Reference is an item
path = "/".join(hreference.split("/")[:-1]) + "/"
items = (item for item in calendar.items if item.name == name)
else:
# Reference is a calendar
path = hreference
items = calendar.components
for item in items:
response = ET.Element(_tag("D", "response"))
multistatus.append(response)
href = ET.Element(_tag("D", "href"))
href.text = "%s/%s" % (path, item.name)
response.append(href)
propstat = ET.Element(_tag("D", "propstat"))
response.append(propstat)
prop = ET.Element(_tag("D", "prop"))
propstat.append(prop)
for tag in props:
element = ET.Element(tag)
if tag == _tag("D", "getetag"):
element.text = item.etag
elif tag == _tag("C", "calendar-data"):
if isinstance(item, (ical.Event, ical.Todo, ical.Journal)):
element.text = ical.serialize(
calendar.headers, calendar.timezones + [item])
prop.append(element)
status = ET.Element(_tag("D", "status"))
status.text = _response(200)
propstat.append(status)
return _pretty_xml(multistatus)