733 lines
24 KiB
Python
733 lines
24 KiB
Python
# This file is part of Radicale Server - Calendar Server
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# Copyright © 2014 Jean-Marc Martins
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# Copyright © 2012-2016 Guillaume Ayoub
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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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Storage backends.
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This module loads the storage backend, according to the storage configuration.
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Default storage uses one folder per collection and one file per collection
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entry.
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"""
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import errno
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import json
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import os
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import posixpath
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import shutil
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import stat
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import threading
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import time
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from contextlib import contextmanager
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from hashlib import md5
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from importlib import import_module
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from itertools import groupby
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from random import getrandbits
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from tempfile import TemporaryDirectory
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from atomicwrites import AtomicWriter
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import vobject
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if os.name == "nt":
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import ctypes
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import ctypes.wintypes
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import msvcrt
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LOCKFILE_EXCLUSIVE_LOCK = 2
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if ctypes.sizeof(ctypes.c_void_p) == 4:
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ULONG_PTR = ctypes.c_uint32
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else:
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ULONG_PTR = ctypes.c_uint64
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class Overlapped(ctypes.Structure):
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_fields_ = [
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("internal", ULONG_PTR),
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("internal_high", ULONG_PTR),
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("offset", ctypes.wintypes.DWORD),
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("offset_high", ctypes.wintypes.DWORD),
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("h_event", ctypes.wintypes.HANDLE)]
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lock_file_ex = ctypes.windll.kernel32.LockFileEx
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lock_file_ex.argtypes = [
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ctypes.wintypes.HANDLE,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.POINTER(Overlapped)]
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lock_file_ex.restype = ctypes.wintypes.BOOL
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unlock_file_ex = ctypes.windll.kernel32.UnlockFileEx
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unlock_file_ex.argtypes = [
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ctypes.wintypes.HANDLE,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.POINTER(Overlapped)]
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unlock_file_ex.restype = ctypes.wintypes.BOOL
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elif os.name == "posix":
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import fcntl
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def load(configuration, logger):
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"""Load the storage manager chosen in configuration."""
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storage_type = configuration.get("storage", "type")
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if storage_type == "multifilesystem":
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collection_class = Collection
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else:
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collection_class = import_module(storage_type).Collection
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class CollectionCopy(collection_class):
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"""Collection copy, avoids overriding the original class attributes."""
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CollectionCopy.configuration = configuration
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CollectionCopy.logger = logger
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return CollectionCopy
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def get_etag(text):
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"""Etag from collection or item."""
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etag = md5()
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etag.update(text.encode("utf-8"))
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return '"%s"' % etag.hexdigest()
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def get_uid(item):
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"""UID value of an item if defined."""
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return hasattr(item, "uid") and item.uid.value
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def sanitize_path(path):
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"""Make path absolute with leading slash to prevent access to other data.
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Preserve a potential trailing slash.
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"""
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trailing_slash = "/" if path.endswith("/") else ""
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path = posixpath.normpath(path)
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new_path = "/"
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for part in path.split("/"):
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if not part or part in (".", ".."):
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continue
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new_path = posixpath.join(new_path, part)
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trailing_slash = "" if new_path.endswith("/") else trailing_slash
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return new_path + trailing_slash
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def is_safe_path_component(path):
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"""Check if path is a single component of a path.
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Check that the path is safe to join too.
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"""
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return path and "/" not in path and path not in (".", "..")
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def is_safe_filesystem_path_component(path):
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"""Check if path is a single component of a filesystem path.
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Check that the path is safe to join too.
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"""
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return (
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path and not os.path.splitdrive(path)[0] and
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not os.path.split(path)[0] and path not in (os.curdir, os.pardir) and
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not path.startswith(".") and not path.endswith("~"))
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def path_to_filesystem(root, *paths):
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"""Convert path to a local filesystem path relative to base_folder.
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`root` must be a secure filesystem path, it will be prepend to the path.
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Conversion of `paths` is done in a secure manner, or raises ``ValueError``.
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"""
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paths = [sanitize_path(path).strip("/") for path in paths]
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safe_path = root
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for path in paths:
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if not path:
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continue
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for part in path.split("/"):
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if not is_safe_filesystem_path_component(part):
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raise UnsafePathError(part)
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safe_path = os.path.join(safe_path, part)
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return safe_path
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def sync_directory(path):
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"""Sync directory to disk.
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This only works on POSIX and does nothing on other systems.
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"""
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if os.name == "posix":
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fd = os.open(path, 0)
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try:
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if hasattr(fcntl, "F_FULLFSYNC"):
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fcntl.fcntl(fd, fcntl.F_FULLFSYNC)
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else:
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os.fsync(fd)
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finally:
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os.close(fd)
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class UnsafePathError(ValueError):
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def __init__(self, path):
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message = "Can't translate name safely to filesystem: %s" % path
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super().__init__(message)
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class ComponentExistsError(ValueError):
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def __init__(self, path):
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message = "Component already exists: %s" % path
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super().__init__(message)
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class ComponentNotFoundError(ValueError):
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def __init__(self, path):
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message = "Component doesn't exist: %s" % path
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super().__init__(message)
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class EtagMismatchError(ValueError):
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def __init__(self, etag1, etag2):
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message = "ETags don't match: %s != %s" % (etag1, etag2)
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super().__init__(message)
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class _EncodedAtomicWriter(AtomicWriter):
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def __init__(self, path, encoding, mode="w", overwrite=True):
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self._encoding = encoding
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return super().__init__(path, mode, overwrite=True)
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def get_fileobject(self, **kwargs):
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return super().get_fileobject(
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encoding=self._encoding, prefix=".Radicale.tmp-", **kwargs)
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class Item:
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def __init__(self, collection, item, href, last_modified=None):
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self.collection = collection
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self.item = item
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self.href = href
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self.last_modified = last_modified
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def __getattr__(self, attr):
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return getattr(self.item, attr)
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@property
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def etag(self):
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return get_etag(self.serialize())
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class BaseCollection:
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# Overriden on copy by the "load" function
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configuration = None
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logger = None
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def __init__(self, path, principal=False):
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"""Initialize the collection.
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``path`` must be the normalized relative path of the collection, using
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the slash as the folder delimiter, with no leading nor trailing slash.
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"""
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raise NotImplementedError
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@classmethod
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def discover(cls, path, depth="0"):
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"""Discover a list of collections under the given ``path``.
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If ``depth`` is "0", only the actual object under ``path`` is
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returned.
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If ``depth`` is anything but "0", it is considered as "1" and direct
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children are included in the result.
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The ``path`` is relative.
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"""
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raise NotImplementedError
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@property
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def etag(self):
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return get_etag(self.serialize())
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@classmethod
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def create_collection(cls, href, collection=None, props=None):
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"""Create a collection.
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``collection`` is a list of vobject components.
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``props`` are metadata values for the collection.
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``props["tag"]`` is the type of collection (VCALENDAR or
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VADDRESSBOOK). If the key ``tag`` is missing, it is guessed from the
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collection.
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"""
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raise NotImplementedError
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def list(self):
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"""List collection items."""
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raise NotImplementedError
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def get(self, href):
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"""Fetch a single item."""
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raise NotImplementedError
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def get_multi(self, hrefs):
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"""Fetch multiple items. Duplicate hrefs must be ignored.
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Functionally similar to ``get``, but might bring performance benefits
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on some storages when used cleverly.
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"""
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for href in set(hrefs):
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yield self.get(href)
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def pre_filtered_list(self, filters):
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"""List collection items with optional pre filtering.
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This could largely improve performance of reports depending on
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the filters and this implementation.
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This returns all event by default
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"""
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return [self.get(href) for href, _ in self.list()]
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def has(self, href):
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"""Check if an item exists by its href.
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Functionally similar to ``get``, but might bring performance benefits
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on some storages when used cleverly.
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"""
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return self.get(href) is not None
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def upload(self, href, vobject_item):
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"""Upload a new item."""
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raise NotImplementedError
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def update(self, href, vobject_item, etag=None):
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"""Update an item.
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Functionally similar to ``delete`` plus ``upload``, but might bring
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performance benefits on some storages when used cleverly.
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"""
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self.delete(href, etag)
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self.upload(href, vobject_item)
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def delete(self, href=None, etag=None):
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"""Delete an item.
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When ``href`` is ``None``, delete the collection.
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"""
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raise NotImplementedError
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def get_meta(self, key):
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"""Get metadata value for collection."""
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raise NotImplementedError
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def set_meta(self, props):
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"""Set metadata values for collection."""
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raise NotImplementedError
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@property
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def last_modified(self):
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"""Get the HTTP-datetime of when the collection was modified."""
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raise NotImplementedError
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def serialize(self):
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"""Get the unicode string representing the whole collection."""
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raise NotImplementedError
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@classmethod
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@contextmanager
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def acquire_lock(cls, mode):
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"""Set a context manager to lock the whole storage.
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``mode`` must either be "r" for shared access or "w" for exclusive
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access.
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"""
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raise NotImplementedError
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class Collection(BaseCollection):
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"""Collection stored in several files per calendar."""
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def __init__(self, path, principal=False, folder=None):
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if not folder:
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folder = self._get_collection_root_folder()
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# Path should already be sanitized
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self.path = sanitize_path(path).strip("/")
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self.encoding = self.configuration.get("encoding", "stock")
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self._filesystem_path = path_to_filesystem(folder, self.path)
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self._props_path = os.path.join(
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self._filesystem_path, ".Radicale.props")
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split_path = self.path.split("/")
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self.owner = split_path[0] if len(split_path) > 1 else None
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self.is_principal = principal
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@classmethod
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def _get_collection_root_folder(cls):
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filesystem_folder = os.path.expanduser(
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cls.configuration.get("storage", "filesystem_folder"))
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return os.path.join(filesystem_folder, "collection-root")
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@contextmanager
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def _atomic_write(self, path, mode="w"):
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with _EncodedAtomicWriter(path, self.encoding, mode).open() as fd:
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yield fd
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def _find_available_file_name(self):
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# Prevent infinite loop
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for _ in range(10000):
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file_name = hex(getrandbits(32))[2:]
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if not self.has(file_name):
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return file_name
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raise FileExistsError(errno.EEXIST, "No usable file name found")
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@classmethod
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def discover(cls, path, depth="0"):
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if path is None:
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# Wrong URL
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return
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# Path should already be sanitized
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sane_path = sanitize_path(path).strip("/")
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attributes = sane_path.split("/")
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if not attributes[0]:
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attributes.pop()
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# Try to guess if the path leads to a collection or an item
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folder = cls._get_collection_root_folder()
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try:
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filesystem_path = path_to_filesystem(folder, sane_path)
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except ValueError:
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# Path is unsafe
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return
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if not os.path.isdir(filesystem_path):
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if attributes and os.path.isfile(filesystem_path):
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href = attributes.pop()
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else:
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return
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else:
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href = None
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path = "/".join(attributes)
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principal = len(attributes) == 1
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collection = cls(path, principal)
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if href:
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yield collection.get(href)
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return
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yield collection
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if depth == "0":
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return
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for item in collection.list():
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yield collection.get(item[0])
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for href in os.listdir(filesystem_path):
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if not is_safe_filesystem_path_component(href):
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cls.logger.debug("Skipping collection: %s", href)
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continue
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child_filesystem_path = path_to_filesystem(filesystem_path, href)
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if os.path.isdir(child_filesystem_path):
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child_principal = len(attributes) == 0
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yield cls(child_filesystem_path, child_principal)
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@classmethod
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def create_collection(cls, href, collection=None, props=None):
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folder = cls._get_collection_root_folder()
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# Path should already be sanitized
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sane_path = sanitize_path(href).strip("/")
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attributes = sane_path.split("/")
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if not attributes[0]:
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attributes.pop()
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principal = len(attributes) == 1
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filesystem_path = path_to_filesystem(folder, sane_path)
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if not props:
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props = {}
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if not props.get("tag") and collection:
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props["tag"] = collection[0].name
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if not props:
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os.makedirs(filesystem_path, exist_ok=True)
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return cls(sane_path, principal=principal)
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parent_dir = os.path.dirname(filesystem_path)
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os.makedirs(parent_dir, exist_ok=True)
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# Create a temporary directory with an unsafe name
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with TemporaryDirectory(
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prefix=".Radicale.tmp-", dir=parent_dir) as tmp_dir:
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# The temporary directory itself can't be renamed
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tmp_filesystem_path = os.path.join(tmp_dir, "collection")
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os.makedirs(tmp_filesystem_path)
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self = cls("/", principal=principal, folder=tmp_filesystem_path)
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self.set_meta(props)
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if collection:
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if props.get("tag") == "VCALENDAR":
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collection, = collection
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items = []
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for content in ("vevent", "vtodo", "vjournal"):
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items.extend(
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getattr(collection, "%s_list" % content, []))
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items_by_uid = groupby(sorted(items, key=get_uid), get_uid)
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for uid, items in items_by_uid:
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new_collection = vobject.iCalendar()
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for item in items:
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new_collection.add(item)
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self.upload(
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self._find_available_file_name(), new_collection)
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elif props.get("tag") == "VCARD":
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for card in collection:
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self.upload(self._find_available_file_name(), card)
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os.rename(tmp_filesystem_path, filesystem_path)
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sync_directory(parent_dir)
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return cls(sane_path, principal=principal)
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def list(self):
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try:
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hrefs = os.listdir(self._filesystem_path)
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except IOError:
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return
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for href in hrefs:
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if not is_safe_filesystem_path_component(href):
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self.logger.debug("Skipping component: %s", href)
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continue
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path = os.path.join(self._filesystem_path, href)
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if os.path.isfile(path):
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with open(path, encoding=self.encoding) as fd:
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yield href, get_etag(fd.read())
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def get(self, href):
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if not href:
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return None
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href = href.strip("{}").replace("/", "_")
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if not is_safe_filesystem_path_component(href):
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self.logger.debug(
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"Can't translate name safely to filesystem: %s", href)
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return None
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path = path_to_filesystem(self._filesystem_path, href)
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if not os.path.isfile(path):
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return None
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with open(path, encoding=self.encoding) as fd:
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text = fd.read()
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last_modified = time.strftime(
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"%a, %d %b %Y %H:%M:%S GMT",
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time.gmtime(os.path.getmtime(path)))
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return Item(self, vobject.readOne(text), href, last_modified)
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def has(self, href):
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return self.get(href) is not None
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def upload(self, href, vobject_item):
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# TODO: use returned object in code
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if not is_safe_filesystem_path_component(href):
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raise UnsafePathError(href)
|
|
path = path_to_filesystem(self._filesystem_path, href)
|
|
if os.path.exists(path):
|
|
raise ComponentExistsError(href)
|
|
item = Item(self, vobject_item, href)
|
|
with self._atomic_write(path) as fd:
|
|
fd.write(item.serialize())
|
|
return item
|
|
|
|
def update(self, href, vobject_item, etag=None):
|
|
# TODO: use etag in code and test it here
|
|
# TODO: use returned object in code
|
|
if not is_safe_filesystem_path_component(href):
|
|
raise UnsafePathError(href)
|
|
path = path_to_filesystem(self._filesystem_path, href)
|
|
if not os.path.isfile(path):
|
|
raise ComponentNotFoundError(href)
|
|
with open(path, encoding=self.encoding) as fd:
|
|
text = fd.read()
|
|
if etag and etag != get_etag(text):
|
|
raise EtagMismatchError(etag, get_etag(text))
|
|
item = Item(self, vobject_item, href)
|
|
with self._atomic_write(path) as fd:
|
|
fd.write(item.serialize())
|
|
return item
|
|
|
|
def delete(self, href=None, etag=None):
|
|
# TODO: use etag in code and test it here
|
|
# TODO: use returned object in code
|
|
if href is None:
|
|
# Delete the collection
|
|
if os.path.isdir(self._filesystem_path):
|
|
shutil.rmtree(self._filesystem_path)
|
|
else:
|
|
# Delete an item
|
|
if not is_safe_filesystem_path_component(href):
|
|
raise UnsafePathError(href)
|
|
path = path_to_filesystem(self._filesystem_path, href)
|
|
if not os.path.isfile(path):
|
|
raise ComponentNotFoundError(href)
|
|
with open(path, encoding=self.encoding) as fd:
|
|
text = fd.read()
|
|
if etag and etag != get_etag(text):
|
|
raise EtagMismatchError(etag, get_etag(text))
|
|
os.remove(path)
|
|
|
|
def get_meta(self, key):
|
|
if os.path.exists(self._props_path):
|
|
with open(self._props_path, encoding=self.encoding) as prop:
|
|
return json.load(prop).get(key)
|
|
|
|
def set_meta(self, props):
|
|
if os.path.exists(self._props_path):
|
|
with open(self._props_path, encoding=self.encoding) as prop:
|
|
old_props = json.load(prop)
|
|
old_props.update(props)
|
|
props = old_props
|
|
props = {key: value for key, value in props.items() if value}
|
|
with self._atomic_write(self._props_path, "w+") as prop:
|
|
json.dump(props, prop)
|
|
|
|
@property
|
|
def last_modified(self):
|
|
last = max([os.path.getmtime(self._filesystem_path)] + [
|
|
os.path.getmtime(os.path.join(self._filesystem_path, filename))
|
|
for filename in os.listdir(self._filesystem_path)] or [0])
|
|
return time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(last))
|
|
|
|
def serialize(self):
|
|
if not os.path.exists(self._filesystem_path):
|
|
return None
|
|
items = []
|
|
for href in os.listdir(self._filesystem_path):
|
|
if not is_safe_filesystem_path_component(href):
|
|
self.logger.debug("Skipping component: %s", href)
|
|
continue
|
|
path = os.path.join(self._filesystem_path, href)
|
|
if os.path.isfile(path):
|
|
with open(path, encoding=self.encoding) as fd:
|
|
items.append(vobject.readOne(fd.read()))
|
|
if self.get_meta("tag") == "VCALENDAR":
|
|
collection = vobject.iCalendar()
|
|
for item in items:
|
|
for content in ("vevent", "vtodo", "vjournal"):
|
|
if content in item.contents:
|
|
for item_part in getattr(item, "%s_list" % content):
|
|
collection.add(item_part)
|
|
break
|
|
return collection.serialize()
|
|
elif self.get_meta("tag") == "VADDRESSBOOK":
|
|
return "".join([item.serialize() for item in items])
|
|
return ""
|
|
|
|
_lock = threading.Lock()
|
|
_waiters = []
|
|
_lock_file = None
|
|
_lock_file_locked = False
|
|
_readers = 0
|
|
_writer = False
|
|
|
|
@classmethod
|
|
@contextmanager
|
|
def acquire_lock(cls, mode):
|
|
def condition():
|
|
if mode == "r":
|
|
return not cls._writer
|
|
else:
|
|
return not cls._writer and cls._readers == 0
|
|
|
|
# Use a primitive lock which only works within one process as a
|
|
# precondition for inter-process file-based locking
|
|
with cls._lock:
|
|
if cls._waiters or not condition():
|
|
# Use FIFO for access requests
|
|
waiter = threading.Condition(lock=cls._lock)
|
|
cls._waiters.append(waiter)
|
|
while True:
|
|
waiter.wait()
|
|
if condition():
|
|
break
|
|
cls._waiters.pop(0)
|
|
if mode == "r":
|
|
cls._readers += 1
|
|
# Notify additional potential readers
|
|
if cls._waiters:
|
|
cls._waiters[0].notify()
|
|
else:
|
|
cls._writer = True
|
|
if not cls._lock_file:
|
|
folder = os.path.expanduser(
|
|
cls.configuration.get("storage", "filesystem_folder"))
|
|
if not os.path.exists(folder):
|
|
os.makedirs(folder, exist_ok=True)
|
|
lock_path = os.path.join(folder, ".Radicale.lock")
|
|
cls._lock_file = open(lock_path, "w+")
|
|
# Set access rights to a necessary minimum to prevent locking
|
|
# by arbitrary users
|
|
try:
|
|
os.chmod(lock_path, stat.S_IWUSR | stat.S_IRUSR)
|
|
except OSError:
|
|
cls.logger.debug("Failed to set permissions on lock file")
|
|
if not cls._lock_file_locked:
|
|
if os.name == "nt":
|
|
handle = msvcrt.get_osfhandle(cls._lock_file.fileno())
|
|
flags = LOCKFILE_EXCLUSIVE_LOCK if mode == "w" else 0
|
|
overlapped = Overlapped()
|
|
if not lock_file_ex(handle, flags, 0, 1, 0, overlapped):
|
|
cls.logger.debug("Locking not supported")
|
|
elif os.name == "posix":
|
|
_cmd = fcntl.LOCK_EX if mode == "w" else fcntl.LOCK_SH
|
|
try:
|
|
fcntl.flock(cls._lock_file.fileno(), _cmd)
|
|
except OSError:
|
|
cls.logger.debug("Locking not supported")
|
|
cls._lock_file_locked = True
|
|
try:
|
|
yield
|
|
finally:
|
|
with cls._lock:
|
|
if mode == "r":
|
|
cls._readers -= 1
|
|
else:
|
|
cls._writer = False
|
|
if cls._readers == 0:
|
|
if os.name == "nt":
|
|
handle = msvcrt.get_osfhandle(cls._lock_file.fileno())
|
|
overlapped = Overlapped()
|
|
if not unlock_file_ex(handle, 0, 1, 0, overlapped):
|
|
cls.logger.debug("Unlocking not supported")
|
|
elif os.name == "posix":
|
|
try:
|
|
fcntl.flock(cls._lock_file.fileno(), fcntl.LOCK_UN)
|
|
except OSError:
|
|
cls.logger.debug("Unlocking not supported")
|
|
cls._lock_file_locked = False
|
|
if cls._waiters:
|
|
cls._waiters[0].notify()
|