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553 lines
23 KiB
Python
553 lines
23 KiB
Python
# This file is part of Radicale - CalDAV and CardDAV server
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# Copyright © 2008 Nicolas Kandel
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# Copyright © 2008 Pascal Halter
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# Copyright © 2008-2017 Guillaume Ayoub
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# Copyright © 2017-2018 Unrud <unrud@outlook.com>
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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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import contextlib
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import copy
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import datetime
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import posixpath
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import socket
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import xml.etree.ElementTree as ET
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from http import client
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from typing import (Any, Callable, Iterable, Iterator, List, Optional,
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Sequence, Tuple, Union)
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from urllib.parse import unquote, urlparse
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import vobject
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import vobject.base
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from vobject.base import ContentLine
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import radicale.item as radicale_item
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from radicale import httputils, pathutils, storage, types, xmlutils
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from radicale.app.base import Access, ApplicationBase
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from radicale.item import filter as radicale_filter
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from radicale.log import logger
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def free_busy_report(base_prefix: str, path: str, xml_request: Optional[ET.Element],
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collection: storage.BaseCollection, encoding: str,
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unlock_storage_fn: Callable[[], None],
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max_occurrence: int
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) -> Tuple[int, Union[ET.Element, str]]:
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# NOTE: this function returns both an Element and a string because
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# free-busy reports are an edge-case on the return type according
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# to the spec.
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multistatus = ET.Element(xmlutils.make_clark("D:multistatus"))
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if xml_request is None:
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return client.MULTI_STATUS, multistatus
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root = xml_request
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if (root.tag == xmlutils.make_clark("C:free-busy-query") and
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collection.tag != "VCALENDAR"):
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logger.warning("Invalid REPORT method %r on %r requested",
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xmlutils.make_human_tag(root.tag), path)
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return client.FORBIDDEN, xmlutils.webdav_error("D:supported-report")
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time_range_element = root.find(xmlutils.make_clark("C:time-range"))
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assert isinstance(time_range_element, ET.Element)
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# Build a single filter from the free busy query for retrieval
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# TODO: filter for VFREEBUSY in additional to VEVENT but
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# test_filter doesn't support that yet.
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vevent_cf_element = ET.Element(xmlutils.make_clark("C:comp-filter"),
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attrib={'name': 'VEVENT'})
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vevent_cf_element.append(time_range_element)
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vcalendar_cf_element = ET.Element(xmlutils.make_clark("C:comp-filter"),
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attrib={'name': 'VCALENDAR'})
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vcalendar_cf_element.append(vevent_cf_element)
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filter_element = ET.Element(xmlutils.make_clark("C:filter"))
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filter_element.append(vcalendar_cf_element)
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filters = (filter_element,)
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# First pull from storage
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retrieved_items = list(collection.get_filtered(filters))
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# !!! Don't access storage after this !!!
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unlock_storage_fn()
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cal = vobject.iCalendar()
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collection_tag = collection.tag
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while retrieved_items:
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# Second filtering before evaluating occurrences.
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# ``item.vobject_item`` might be accessed during filtering.
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# Don't keep reference to ``item``, because VObject requires a lot of
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# memory.
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item, filter_matched = retrieved_items.pop(0)
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if not filter_matched:
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try:
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if not test_filter(collection_tag, item, filter_element):
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continue
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except ValueError as e:
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raise ValueError("Failed to free-busy filter item %r from %r: %s" %
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(item.href, collection.path, e)) from e
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except Exception as e:
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raise RuntimeError("Failed to free-busy filter item %r from %r: %s" %
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(item.href, collection.path, e)) from e
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fbtype = None
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if item.component_name == 'VEVENT':
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transp = getattr(item.vobject_item.vevent, 'transp', None)
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if transp and transp.value != 'OPAQUE':
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continue
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status = getattr(item.vobject_item.vevent, 'status', None)
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if not status or status.value == 'CONFIRMED':
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fbtype = 'BUSY'
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elif status.value == 'CANCELLED':
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fbtype = 'FREE'
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elif status.value == 'TENTATIVE':
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fbtype = 'BUSY-TENTATIVE'
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else:
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# Could do fbtype = status.value for x-name, I prefer this
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fbtype = 'BUSY'
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# TODO: coalesce overlapping periods
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if max_occurrence > 0:
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n_occurrences = max_occurrence+1
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else:
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n_occurrences = 0
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occurrences = radicale_filter.time_range_fill(item.vobject_item,
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time_range_element,
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"VEVENT",
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n=n_occurrences)
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if len(occurrences) >= max_occurrence:
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raise ValueError("FREEBUSY occurrences limit of {} hit"
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.format(max_occurrence))
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for occurrence in occurrences:
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vfb = cal.add('vfreebusy')
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vfb.add('dtstamp').value = item.vobject_item.vevent.dtstamp.value
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vfb.add('dtstart').value, vfb.add('dtend').value = occurrence
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if fbtype:
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vfb.add('fbtype').value = fbtype
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return (client.OK, cal.serialize())
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def xml_report(base_prefix: str, path: str, xml_request: Optional[ET.Element],
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collection: storage.BaseCollection, encoding: str,
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unlock_storage_fn: Callable[[], None]
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) -> Tuple[int, ET.Element]:
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"""Read and answer REPORT requests that return XML.
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Read rfc3253-3.6 for info.
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"""
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multistatus = ET.Element(xmlutils.make_clark("D:multistatus"))
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if xml_request is None:
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return client.MULTI_STATUS, multistatus
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root = xml_request
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if root.tag in (xmlutils.make_clark("D:principal-search-property-set"),
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xmlutils.make_clark("D:principal-property-search"),
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xmlutils.make_clark("D:expand-property")):
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# We don't support searching for principals or indirect retrieving of
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# properties, just return an empty result.
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# InfCloud asks for expand-property reports (even if we don't announce
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# support for them) and stops working if an error code is returned.
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logger.warning("Unsupported REPORT method %r on %r requested",
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xmlutils.make_human_tag(root.tag), path)
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return client.MULTI_STATUS, multistatus
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if (root.tag == xmlutils.make_clark("C:calendar-multiget") and
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collection.tag != "VCALENDAR" or
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root.tag == xmlutils.make_clark("CR:addressbook-multiget") and
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collection.tag != "VADDRESSBOOK" or
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root.tag == xmlutils.make_clark("D:sync-collection") and
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collection.tag not in ("VADDRESSBOOK", "VCALENDAR")):
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logger.warning("Invalid REPORT method %r on %r requested",
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xmlutils.make_human_tag(root.tag), path)
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return client.FORBIDDEN, xmlutils.webdav_error("D:supported-report")
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props: Union[ET.Element, List] = root.find(xmlutils.make_clark("D:prop")) or []
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hreferences: Iterable[str]
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if root.tag in (
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xmlutils.make_clark("C:calendar-multiget"),
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xmlutils.make_clark("CR:addressbook-multiget")):
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# Read rfc4791-7.9 for info
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hreferences = set()
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for href_element in root.findall(xmlutils.make_clark("D:href")):
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temp_url_path = urlparse(href_element.text).path
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assert isinstance(temp_url_path, str)
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href_path = pathutils.sanitize_path(unquote(temp_url_path))
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if (href_path + "/").startswith(base_prefix + "/"):
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hreferences.add(href_path[len(base_prefix):])
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else:
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logger.warning("Skipping invalid path %r in REPORT request on "
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"%r", href_path, path)
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elif root.tag == xmlutils.make_clark("D:sync-collection"):
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old_sync_token_element = root.find(
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xmlutils.make_clark("D:sync-token"))
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old_sync_token = ""
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if old_sync_token_element is not None and old_sync_token_element.text:
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old_sync_token = old_sync_token_element.text.strip()
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logger.debug("Client provided sync token: %r", old_sync_token)
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try:
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sync_token, names = collection.sync(old_sync_token)
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except ValueError as e:
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# Invalid sync token
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logger.warning("Client provided invalid sync token %r: %s",
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old_sync_token, e, exc_info=True)
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# client.CONFLICT doesn't work with some clients (e.g. InfCloud)
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return (client.FORBIDDEN,
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xmlutils.webdav_error("D:valid-sync-token"))
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hreferences = (pathutils.unstrip_path(
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posixpath.join(collection.path, n)) for n in names)
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# Append current sync token to response
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sync_token_element = ET.Element(xmlutils.make_clark("D:sync-token"))
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sync_token_element.text = sync_token
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multistatus.append(sync_token_element)
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else:
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hreferences = (path,)
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filters = (
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root.findall(xmlutils.make_clark("C:filter")) +
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root.findall(xmlutils.make_clark("CR:filter")))
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# Retrieve everything required for finishing the request.
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retrieved_items = list(retrieve_items(
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base_prefix, path, collection, hreferences, filters, multistatus))
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collection_tag = collection.tag
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# !!! Don't access storage after this !!!
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unlock_storage_fn()
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while retrieved_items:
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# ``item.vobject_item`` might be accessed during filtering.
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# Don't keep reference to ``item``, because VObject requires a lot of
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# memory.
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item, filters_matched = retrieved_items.pop(0)
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if filters and not filters_matched:
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try:
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if not all(test_filter(collection_tag, item, filter_)
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for filter_ in filters):
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continue
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except ValueError as e:
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raise ValueError("Failed to filter item %r from %r: %s" %
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(item.href, collection.path, e)) from e
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except Exception as e:
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raise RuntimeError("Failed to filter item %r from %r: %s" %
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(item.href, collection.path, e)) from e
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found_props = []
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not_found_props = []
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for prop in props:
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element = ET.Element(prop.tag)
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if prop.tag == xmlutils.make_clark("D:getetag"):
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element.text = item.etag
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found_props.append(element)
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elif prop.tag == xmlutils.make_clark("D:getcontenttype"):
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element.text = xmlutils.get_content_type(item, encoding)
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found_props.append(element)
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elif prop.tag in (
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xmlutils.make_clark("C:calendar-data"),
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xmlutils.make_clark("CR:address-data")):
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element.text = item.serialize()
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expand = prop.find(xmlutils.make_clark("C:expand"))
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if expand is not None and item.component_name == 'VEVENT':
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start = expand.get('start')
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end = expand.get('end')
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if (start is None) or (end is None):
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return client.FORBIDDEN, \
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xmlutils.webdav_error("C:expand")
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start = datetime.datetime.strptime(
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start, '%Y%m%dT%H%M%SZ'
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).replace(tzinfo=datetime.timezone.utc)
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end = datetime.datetime.strptime(
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end, '%Y%m%dT%H%M%SZ'
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).replace(tzinfo=datetime.timezone.utc)
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expanded_element = _expand(
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element, copy.copy(item), start, end)
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found_props.append(expanded_element)
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else:
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found_props.append(element)
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else:
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not_found_props.append(element)
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assert item.href
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uri = pathutils.unstrip_path(
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posixpath.join(collection.path, item.href))
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multistatus.append(xml_item_response(
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base_prefix, uri, found_props=found_props,
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not_found_props=not_found_props, found_item=True))
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return client.MULTI_STATUS, multistatus
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def _expand(
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element: ET.Element,
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item: radicale_item.Item,
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start: datetime.datetime,
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end: datetime.datetime,
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) -> ET.Element:
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dt_format = '%Y%m%dT%H%M%SZ'
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if type(item.vobject_item.vevent.dtstart.value) is datetime.date:
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# If an event comes to us with a dt_start specified as a date
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# then in the response we return the date, not datetime
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dt_format = '%Y%m%d'
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expanded_item, rruleset = _make_vobject_expanded_item(item, dt_format)
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if rruleset:
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recurrences = rruleset.between(start, end, inc=True)
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expanded: vobject.base.Component = copy.copy(expanded_item.vobject_item)
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is_expanded_filled: bool = False
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for recurrence_dt in recurrences:
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recurrence_utc = recurrence_dt.astimezone(datetime.timezone.utc)
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vevent = copy.deepcopy(expanded.vevent)
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vevent.recurrence_id = ContentLine(
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name='RECURRENCE-ID',
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value=recurrence_utc.strftime(dt_format), params={}
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)
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if is_expanded_filled is False:
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expanded.vevent = vevent
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is_expanded_filled = True
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else:
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expanded.add(vevent)
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element.text = expanded.serialize()
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else:
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element.text = expanded_item.vobject_item.serialize()
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return element
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def _make_vobject_expanded_item(
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item: radicale_item.Item,
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dt_format: str,
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) -> Tuple[radicale_item.Item, Optional[Any]]:
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# https://www.rfc-editor.org/rfc/rfc4791#section-9.6.5
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# The returned calendar components MUST NOT use recurrence
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# properties (i.e., EXDATE, EXRULE, RDATE, and RRULE) and MUST NOT
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# have reference to or include VTIMEZONE components. Date and local
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# time with reference to time zone information MUST be converted
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# into date with UTC time.
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item = copy.copy(item)
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vevent = item.vobject_item.vevent
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if type(vevent.dtstart.value) is datetime.date:
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start_utc = datetime.datetime.fromordinal(
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vevent.dtstart.value.toordinal()
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).replace(tzinfo=datetime.timezone.utc)
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else:
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start_utc = vevent.dtstart.value.astimezone(datetime.timezone.utc)
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vevent.dtstart = ContentLine(name='DTSTART', value=start_utc, params=[])
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dt_end = getattr(vevent, 'dtend', None)
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if dt_end is not None:
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if type(vevent.dtend.value) is datetime.date:
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end_utc = datetime.datetime.fromordinal(
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dt_end.value.toordinal()
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).replace(tzinfo=datetime.timezone.utc)
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else:
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end_utc = dt_end.value.astimezone(datetime.timezone.utc)
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vevent.dtend = ContentLine(name='DTEND', value=end_utc, params={})
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rruleset = None
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if hasattr(item.vobject_item.vevent, 'rrule'):
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rruleset = vevent.getrruleset()
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# There is something strange behaviour during serialization native datetime, so converting manually
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vevent.dtstart.value = vevent.dtstart.value.strftime(dt_format)
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if dt_end is not None:
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vevent.dtend.value = vevent.dtend.value.strftime(dt_format)
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timezones_to_remove = []
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for component in item.vobject_item.components():
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if component.name == 'VTIMEZONE':
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timezones_to_remove.append(component)
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for timezone in timezones_to_remove:
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item.vobject_item.remove(timezone)
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try:
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delattr(item.vobject_item.vevent, 'rrule')
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delattr(item.vobject_item.vevent, 'exdate')
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delattr(item.vobject_item.vevent, 'exrule')
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delattr(item.vobject_item.vevent, 'rdate')
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except AttributeError:
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pass
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return item, rruleset
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def xml_item_response(base_prefix: str, href: str,
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found_props: Sequence[ET.Element] = (),
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not_found_props: Sequence[ET.Element] = (),
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found_item: bool = True) -> ET.Element:
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response = ET.Element(xmlutils.make_clark("D:response"))
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href_element = ET.Element(xmlutils.make_clark("D:href"))
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href_element.text = xmlutils.make_href(base_prefix, href)
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response.append(href_element)
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if found_item:
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for code, props in ((200, found_props), (404, not_found_props)):
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if props:
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propstat = ET.Element(xmlutils.make_clark("D:propstat"))
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status = ET.Element(xmlutils.make_clark("D:status"))
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status.text = xmlutils.make_response(code)
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prop_element = ET.Element(xmlutils.make_clark("D:prop"))
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for prop in props:
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prop_element.append(prop)
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propstat.append(prop_element)
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propstat.append(status)
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response.append(propstat)
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else:
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status = ET.Element(xmlutils.make_clark("D:status"))
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status.text = xmlutils.make_response(404)
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response.append(status)
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return response
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def retrieve_items(
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base_prefix: str, path: str, collection: storage.BaseCollection,
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hreferences: Iterable[str], filters: Sequence[ET.Element],
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multistatus: ET.Element) -> Iterator[Tuple[radicale_item.Item, bool]]:
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"""Retrieves all items that are referenced in ``hreferences`` from
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``collection`` and adds 404 responses for missing and invalid items
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to ``multistatus``."""
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collection_requested = False
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def get_names() -> Iterator[str]:
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"""Extracts all names from references in ``hreferences`` and adds
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404 responses for invalid references to ``multistatus``.
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If the whole collections is referenced ``collection_requested``
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gets set to ``True``."""
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nonlocal collection_requested
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for hreference in hreferences:
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try:
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name = pathutils.name_from_path(hreference, collection)
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except ValueError as e:
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logger.warning("Skipping invalid path %r in REPORT request on "
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"%r: %s", hreference, path, e)
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response = xml_item_response(base_prefix, hreference,
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found_item=False)
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multistatus.append(response)
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continue
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if name:
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# Reference is an item
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yield name
|
|
else:
|
|
# Reference is a collection
|
|
collection_requested = True
|
|
|
|
for name, item in collection.get_multi(get_names()):
|
|
if not item:
|
|
uri = pathutils.unstrip_path(posixpath.join(collection.path, name))
|
|
response = xml_item_response(base_prefix, uri, found_item=False)
|
|
multistatus.append(response)
|
|
else:
|
|
yield item, False
|
|
if collection_requested:
|
|
yield from collection.get_filtered(filters)
|
|
|
|
|
|
def test_filter(collection_tag: str, item: radicale_item.Item,
|
|
filter_: ET.Element) -> bool:
|
|
"""Match an item against a filter."""
|
|
if (collection_tag == "VCALENDAR" and
|
|
filter_.tag != xmlutils.make_clark("C:%s" % filter_)):
|
|
if len(filter_) == 0:
|
|
return True
|
|
if len(filter_) > 1:
|
|
raise ValueError("Filter with %d children" % len(filter_))
|
|
if filter_[0].tag != xmlutils.make_clark("C:comp-filter"):
|
|
raise ValueError("Unexpected %r in filter" % filter_[0].tag)
|
|
return radicale_filter.comp_match(item, filter_[0])
|
|
if (collection_tag == "VADDRESSBOOK" and
|
|
filter_.tag != xmlutils.make_clark("CR:%s" % filter_)):
|
|
for child in filter_:
|
|
if child.tag != xmlutils.make_clark("CR:prop-filter"):
|
|
raise ValueError("Unexpected %r in filter" % child.tag)
|
|
test = filter_.get("test", "anyof")
|
|
if test == "anyof":
|
|
return any(radicale_filter.prop_match(item.vobject_item, f, "CR")
|
|
for f in filter_)
|
|
if test == "allof":
|
|
return all(radicale_filter.prop_match(item.vobject_item, f, "CR")
|
|
for f in filter_)
|
|
raise ValueError("Unsupported filter test: %r" % test)
|
|
raise ValueError("Unsupported filter %r for %r" %
|
|
(filter_.tag, collection_tag))
|
|
|
|
|
|
class ApplicationPartReport(ApplicationBase):
|
|
|
|
def do_REPORT(self, environ: types.WSGIEnviron, base_prefix: str,
|
|
path: str, user: str) -> types.WSGIResponse:
|
|
"""Manage REPORT request."""
|
|
access = Access(self._rights, user, path)
|
|
if not access.check("r"):
|
|
return httputils.NOT_ALLOWED
|
|
try:
|
|
xml_content = self._read_xml_request_body(environ)
|
|
except RuntimeError as e:
|
|
logger.warning("Bad REPORT request on %r: %s", path, e,
|
|
exc_info=True)
|
|
return httputils.BAD_REQUEST
|
|
except socket.timeout:
|
|
logger.debug("Client timed out", exc_info=True)
|
|
return httputils.REQUEST_TIMEOUT
|
|
with contextlib.ExitStack() as lock_stack:
|
|
lock_stack.enter_context(self._storage.acquire_lock("r", user))
|
|
item = next(iter(self._storage.discover(path)), None)
|
|
if not item:
|
|
return httputils.NOT_FOUND
|
|
if not access.check("r", item):
|
|
return httputils.NOT_ALLOWED
|
|
if isinstance(item, storage.BaseCollection):
|
|
collection = item
|
|
else:
|
|
assert item.collection is not None
|
|
collection = item.collection
|
|
|
|
if xml_content is not None and \
|
|
xml_content.tag == xmlutils.make_clark("C:free-busy-query"):
|
|
max_occurrence = self.configuration.get("reporting", "max_freebusy_occurrence")
|
|
try:
|
|
status, body = free_busy_report(
|
|
base_prefix, path, xml_content, collection, self._encoding,
|
|
lock_stack.close, max_occurrence)
|
|
except ValueError as e:
|
|
logger.warning(
|
|
"Bad REPORT request on %r: %s", path, e, exc_info=True)
|
|
return httputils.BAD_REQUEST
|
|
headers = {"Content-Type": "text/calendar; charset=%s" % self._encoding}
|
|
return status, headers, str(body)
|
|
else:
|
|
try:
|
|
status, xml_answer = xml_report(
|
|
base_prefix, path, xml_content, collection, self._encoding,
|
|
lock_stack.close)
|
|
except ValueError as e:
|
|
logger.warning(
|
|
"Bad REPORT request on %r: %s", path, e, exc_info=True)
|
|
return httputils.BAD_REQUEST
|
|
headers = {"Content-Type": "text/xml; charset=%s" % self._encoding}
|
|
return status, headers, self._xml_response(xml_answer)
|