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134 lines
5 KiB
Python
134 lines
5 KiB
Python
# This file is part of Radicale - CalDAV and CardDAV server
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# Copyright © 2020 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 io
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import logging
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import posixpath
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import sys
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import xml.etree.ElementTree as ET
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from typing import Optional
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# HACK: https://github.com/tiran/defusedxml/issues/54
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import defusedxml.ElementTree as DefusedET # isort:skip
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from radicale import (auth, hook, config, httputils, pathutils, rights, storage,
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types, web, xmlutils)
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from radicale.log import logger
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sys.modules["xml.etree"].ElementTree = ET # type:ignore[attr-defined]
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class ApplicationBase:
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configuration: config.Configuration
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_auth: auth.BaseAuth
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_storage: storage.BaseStorage
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_rights: rights.BaseRights
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_web: web.BaseWeb
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_encoding: str
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_hook: hook.BaseHook
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def __init__(self, configuration: config.Configuration) -> None:
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self.configuration = configuration
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self._auth = auth.load(configuration)
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self._storage = storage.load(configuration)
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self._rights = rights.load(configuration)
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self._web = web.load(configuration)
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self._encoding = configuration.get("encoding", "request")
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self._hook = hook.load(configuration)
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def _read_xml_request_body(self, environ: types.WSGIEnviron
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) -> Optional[ET.Element]:
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content = httputils.decode_request(
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self.configuration, environ,
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httputils.read_raw_request_body(self.configuration, environ))
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if not content:
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return None
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try:
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xml_content = DefusedET.fromstring(content)
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except ET.ParseError as e:
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logger.debug("Request content (Invalid XML):\n%s", content)
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raise RuntimeError("Failed to parse XML: %s" % e) from e
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if logger.isEnabledFor(logging.DEBUG):
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logger.debug("Request content:\n%s",
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xmlutils.pretty_xml(xml_content))
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return xml_content
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def _xml_response(self, xml_content: ET.Element) -> bytes:
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if logger.isEnabledFor(logging.DEBUG):
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logger.debug("Response content:\n%s",
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xmlutils.pretty_xml(xml_content))
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f = io.BytesIO()
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ET.ElementTree(xml_content).write(f, encoding=self._encoding,
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xml_declaration=True)
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return f.getvalue()
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def _webdav_error_response(self, status: int, human_tag: str
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) -> types.WSGIResponse:
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"""Generate XML error response."""
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headers = {"Content-Type": "text/xml; charset=%s" % self._encoding}
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content = self._xml_response(xmlutils.webdav_error(human_tag))
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return status, headers, content
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class Access:
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"""Helper class to check access rights of an item"""
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user: str
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path: str
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parent_path: str
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permissions: str
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_rights: rights.BaseRights
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_parent_permissions: Optional[str]
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def __init__(self, rights: rights.BaseRights, user: str, path: str
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) -> None:
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self._rights = rights
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self.user = user
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self.path = path
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self.parent_path = pathutils.unstrip_path(
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posixpath.dirname(pathutils.strip_path(path)), True)
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self.permissions = self._rights.authorization(self.user, self.path)
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self._parent_permissions = None
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@property
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def parent_permissions(self) -> str:
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if self.path == self.parent_path:
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return self.permissions
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if self._parent_permissions is None:
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self._parent_permissions = self._rights.authorization(
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self.user, self.parent_path)
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return self._parent_permissions
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def check(self, permission: str,
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item: Optional[types.CollectionOrItem] = None) -> bool:
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if permission not in "rw":
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raise ValueError("Invalid permission argument: %r" % permission)
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if not item:
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permissions = permission + permission.upper()
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parent_permissions = permission
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elif isinstance(item, storage.BaseCollection):
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if item.tag:
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permissions = permission
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else:
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permissions = permission.upper()
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parent_permissions = ""
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else:
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permissions = ""
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parent_permissions = permission
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return bool(rights.intersect(self.permissions, permissions) or (
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self.path != self.parent_path and
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rights.intersect(self.parent_permissions, parent_permissions)))
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