Improve rights checking and request handlers
* Access rights are checked before the storage is locked and
collections are loaded.
* DELETE sends 410 instead of doing nothing or crashing if the target
doesn't exist.
* GET always returns 404 if the target doesn't exist.
* GET doesn't crash if a collection without tag property is requested.
* MKCOL and MKCALENDAR send 409 if the target already exists.
* MOVE checks if the target collection of an item actually exists and
sends 409 otherwise.
* PUT doesn't crash if a whole collection that doesn't exist yet is
uploaded and ``content-type`` is ``text/vcard`` or
``text/calendar``.
* PUT distinguishes between simple items and whole collections by the
following criteria: Target is a collection; Parent exists; Parent
has the tag property set; Parent contains other items. Before only
the first two criteria where used, which was very unrelieable. #384
* PROPPATCH is only allowed on collections and 409 is send otherwise.
* ``Rights.authorized`` takes a path instead of a collection.
* ``Collection.discover`` only returns items in ``path``, that
actually exist. #442
This commit is contained in:
Unrud
@@ -29,6 +29,7 @@ should have been included in this package.
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import base64
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import contextlib
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import os
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import posixpath
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import pprint
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import shlex
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import socket
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@@ -38,6 +39,7 @@ import subprocess
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import threading
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import wsgiref.simple_server
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import zlib
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from contextlib import contextmanager
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from http import client
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from urllib.parse import unquote, urlparse
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@@ -184,60 +186,31 @@ class Application:
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def collect_allowed_items(self, items, user):
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"""Get items from request that user is allowed to access."""
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read_last_collection_allowed = None
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write_last_collection_allowed = None
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read_allowed_items = []
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write_allowed_items = []
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for item in items:
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if isinstance(item, self.Collection):
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if self.authorized(user, item, "r"):
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self.logger.debug(
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"%s has read access to collection %s" %
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(user or "Anonymous", item.path or "/"))
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read_last_collection_allowed = True
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read_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO read access to collection %s" %
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(user or "Anonymous", item.path or "/"))
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read_last_collection_allowed = False
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if self.authorized(user, item, "w"):
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self.logger.debug(
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"%s has write access to collection %s" %
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(user or "Anonymous", item.path or "/"))
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write_last_collection_allowed = True
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write_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO write access to collection %s" %
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(user or "Anonymous", item.path or "/"))
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write_last_collection_allowed = False
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path = item.path
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else:
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# item is not a collection, it's the child of the last
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# collection we've met in the loop. Only add this item
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# if this last collection was allowed.
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if read_last_collection_allowed:
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self.logger.debug(
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"%s has read access to item %s" %
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(user or "Anonymous", item.href))
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read_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO read access to item %s" %
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(user or "Anonymous", item.href))
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if write_last_collection_allowed:
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self.logger.debug(
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"%s has write access to item %s" %
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(user or "Anonymous", item.href))
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write_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO write access to item %s" %
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(user or "Anonymous", item.href))
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path = item.collection.path
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if self.authorized(user, path, "r"):
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self.logger.debug(
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"%s has read access to collection %s" %
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(user or "Anonymous", path or "/"))
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read_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO read access to collection %s" %
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(user or "Anonymous", path or "/"))
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if self.authorized(user, path, "w"):
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self.logger.debug(
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"%s has write access to collection %s" %
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(user or "Anonymous", path or "/"))
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write_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO write access to collection %s" %
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(user or "Anonymous", path or "/"))
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return read_allowed_items, write_allowed_items
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def __call__(self, environ, start_response):
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@@ -305,12 +278,11 @@ class Application:
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# Create principal collection
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if user and is_authenticated:
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principal_path = "/%s/" % user
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collection = self.Collection(principal_path, True)
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if self.authorized(user, collection, "w"):
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if self.authorized(user, principal_path, "w"):
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with self.Collection.acquire_lock("r"):
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principal = next(
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self.Collection.discover(principal_path), None)
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if not principal or principal.path != user:
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if not principal:
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with self.Collection.acquire_lock("w"):
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self.Collection.create_collection(principal_path)
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@@ -333,34 +305,7 @@ class Application:
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content = None
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if is_valid_user:
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if function in (
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self.do_GET, self.do_HEAD, self.do_OPTIONS,
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self.do_PROPFIND, self.do_REPORT):
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lock_mode = "r"
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else:
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lock_mode = "w"
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with self.Collection.acquire_lock(lock_mode):
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items = self.Collection.discover(
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path, environ.get("HTTP_DEPTH", "0"))
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read_allowed_items, write_allowed_items = (
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self.collect_allowed_items(items, user))
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if (read_allowed_items or write_allowed_items or
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is_authenticated and function == self.do_PROPFIND or
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function == self.do_OPTIONS):
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status, headers, answer = function(
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environ, read_allowed_items, write_allowed_items,
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content, user)
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hook = self.configuration.get("storage", "hook")
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if lock_mode == "w" and hook:
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self.logger.debug("Running hook")
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folder = os.path.expanduser(
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self.configuration.get(
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"storage", "filesystem_folder"))
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subprocess.check_call(
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hook % {"user": shlex.quote(user or "Anonymous")},
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shell=True, cwd=folder)
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else:
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status, headers, answer = NOT_ALLOWED
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status, headers, answer = function(environ, path, content, user)
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else:
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status, headers, answer = NOT_ALLOWED
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@@ -397,144 +342,154 @@ class Application:
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return response(status, headers, answer)
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def do_DELETE(self, environ, read_collections, write_collections, content,
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user):
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def _access(self, user, path, permission, item=None):
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"""Checks if ``user`` can access ``path`` or the parent collection
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with ``permission``.
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``permission`` must either be "r" or "w".
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If ``item`` is given, only access to that class of item is checked.
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"""
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path = storage.sanitize_path(path)
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parent_path = storage.sanitize_path(
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"/%s/" % posixpath.dirname(path.strip("/")))
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allowed = False
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if not item or isinstance(item, self.Collection):
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allowed |= self.authorized(user, path, permission)
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if not item or not isinstance(item, self.Collection):
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allowed |= self.authorized(user, parent_path, permission)
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return allowed
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@contextmanager
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def _lock_collection(self, lock_mode, user):
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"""Lock the collection with ``permission`` and execute hook."""
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with self.Collection.acquire_lock(lock_mode) as value:
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yield value
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hook = self.configuration.get("storage", "hook")
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if lock_mode == "w" and hook:
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self.logger.debug("Running hook")
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folder = os.path.expanduser(self.configuration.get(
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"storage", "filesystem_folder"))
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subprocess.check_call(
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hook % {"user": shlex.quote(user or "Anonymous")},
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shell=True, cwd=folder)
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def do_DELETE(self, environ, path, content, user):
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"""Manage DELETE request."""
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if not write_collections:
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if not self._access(user, path, "w"):
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return NOT_ALLOWED
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collection = write_collections[0]
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if collection.path == environ["PATH_INFO"].strip("/"):
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# Path matching the collection, the collection must be deleted
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item = collection
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else:
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# Try to get an item matching the path
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name = xmlutils.name_from_path(environ["PATH_INFO"], collection)
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item = collection.get(name)
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if item:
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with self._lock_collection("w", user):
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item = next(self.Collection.discover(path, depth="0"), None)
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if not self._access(user, path, "w", item):
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return NOT_ALLOWED
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if not item:
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return client.GONE, {}, None
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if_match = environ.get("HTTP_IF_MATCH", "*")
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if if_match in ("*", item.etag):
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# No ETag precondition or precondition verified, delete item
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answer = xmlutils.delete(environ["PATH_INFO"], collection)
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return client.OK, {}, answer
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if if_match not in ("*", item.etag):
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# ETag precondition not verified, do not delete item
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return client.PRECONDITION_FAILED, {}, None
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if isinstance(item, self.Collection):
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answer = xmlutils.delete(path, item)
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else:
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answer = xmlutils.delete(path, item.collection, item.href)
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return client.OK, {}, answer
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# No item or ETag precondition not verified, do not delete item
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return client.PRECONDITION_FAILED, {}, None
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def do_GET(self, environ, read_collections, write_collections, content,
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user):
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def do_GET(self, environ, path, content, user):
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"""Manage GET request."""
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# Display a "Radicale works!" message if the root URL is requested
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if environ["PATH_INFO"] == "/":
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if not path.strip("/"):
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headers = {"Content-type": "text/html"}
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answer = "<!DOCTYPE html>\n<title>Radicale</title>Radicale works!"
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return client.OK, headers, answer
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if not read_collections:
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if not self._access(user, path, "r"):
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return NOT_ALLOWED
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collection = read_collections[0]
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item_name = xmlutils.name_from_path(environ["PATH_INFO"], collection)
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if item_name:
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# Get collection item
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item = collection.get(item_name)
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if item:
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answer = item.serialize()
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etag = item.etag
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else:
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return client.NOT_FOUND, {}, None
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else:
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# Get whole collection
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answer = collection.serialize()
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if answer is None:
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with self._lock_collection("r", user):
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item = next(self.Collection.discover(path, depth="0"), None)
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if not self._access(user, path, "r", item):
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return NOT_ALLOWED
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if not item:
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return client.NOT_FOUND, {}, None
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if isinstance(item, self.Collection):
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collection = item
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else:
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etag = collection.etag
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if answer:
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collection = item.collection
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content_type = storage.MIMETYPES.get(collection.get_meta("tag"),
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"text/plain")
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headers = {
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"Content-Type": storage.MIMETYPES[collection.get_meta("tag")],
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"Content-Type": content_type,
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"Last-Modified": collection.last_modified,
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"ETag": etag}
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else:
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headers = {}
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return client.OK, headers, answer
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"ETag": item.etag}
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answer = item.serialize()
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return client.OK, headers, answer
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def do_HEAD(self, environ, read_collections, write_collections, content,
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user):
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def do_HEAD(self, environ, path, content, user):
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"""Manage HEAD request."""
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status, headers, answer = self.do_GET(
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environ, read_collections, write_collections, content, user)
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status, headers, answer = self.do_GET(environ, path, content, user)
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return status, headers, None
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def do_MKCALENDAR(self, environ, read_collections, write_collections,
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content, user):
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def do_MKCALENDAR(self, environ, path, content, user):
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"""Manage MKCALENDAR request."""
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if not write_collections:
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if not self.authorized(user, path, "w"):
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return NOT_ALLOWED
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with self._lock_collection("w", user):
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item = next(self.Collection.discover(path, depth="0"), None)
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if item:
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return client.CONFLICT, {}, None
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props = xmlutils.props_from_request(content)
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# TODO: use this?
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# timezone = props.get("C:calendar-timezone")
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collection = self.Collection.create_collection(path,
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tag="VCALENDAR")
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for key, value in props.items():
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collection.set_meta(key, value)
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return client.CREATED, {}, None
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collection = write_collections[0]
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props = xmlutils.props_from_request(content)
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# TODO: use this?
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# timezone = props.get("C:calendar-timezone")
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collection = self.Collection.create_collection(
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environ["PATH_INFO"], tag="VCALENDAR")
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for key, value in props.items():
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collection.set_meta(key, value)
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return client.CREATED, {}, None
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def do_MKCOL(self, environ, read_collections, write_collections, content,
|
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user):
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def do_MKCOL(self, environ, path, content, user):
|
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"""Manage MKCOL request."""
|
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if not write_collections:
|
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if not self.authorized(user, path, "w"):
|
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return NOT_ALLOWED
|
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with self._lock_collection("w", user):
|
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item = next(self.Collection.discover(path, depth="0"), None)
|
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if item:
|
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return client.CONFLICT, {}, None
|
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props = xmlutils.props_from_request(content)
|
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collection = self.Collection.create_collection(path)
|
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for key, value in props.items():
|
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collection.set_meta(key, value)
|
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return client.CREATED, {}, None
|
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|
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collection = write_collections[0]
|
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|
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props = xmlutils.props_from_request(content)
|
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collection = self.Collection.create_collection(environ["PATH_INFO"])
|
||||
for key, value in props.items():
|
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collection.set_meta(key, value)
|
||||
return client.CREATED, {}, None
|
||||
|
||||
def do_MOVE(self, environ, read_collections, write_collections, content,
|
||||
user):
|
||||
def do_MOVE(self, environ, path, content, user):
|
||||
"""Manage MOVE request."""
|
||||
if not write_collections:
|
||||
to_url = urlparse(environ["HTTP_DESTINATION"])
|
||||
if to_url.netloc != environ["HTTP_HOST"]:
|
||||
# Remote destination server, not supported
|
||||
return client.BAD_GATEWAY, {}, None
|
||||
to_path = storage.sanitize_path(to_url.path)
|
||||
if (not self._access(user, path, "w") or
|
||||
not self._access(user, to_path, "w")):
|
||||
return NOT_ALLOWED
|
||||
with self._lock_collection("w", user):
|
||||
item = next(self.Collection.discover(path, depth="0"), None)
|
||||
if (not self._access(user, path, "w", item) or
|
||||
not self._access(user, to_path, "w", item)):
|
||||
return NOT_ALLOWED
|
||||
if not item:
|
||||
return client.GONE, {}, None
|
||||
to_item = next(self.Collection.discover(to_path, depth="0"), None)
|
||||
to_parent_path = storage.sanitize_path(
|
||||
"/%s/" % posixpath.dirname(to_path.strip("/")))
|
||||
to_href = posixpath.basename(to_path.strip("/"))
|
||||
to_collection = next(self.Collection.discover(
|
||||
to_parent_path, depth="0"), None)
|
||||
if (isinstance(item, self.Collection) or not to_collection or
|
||||
to_item or to_path.strip("/").startswith(path.strip("/"))):
|
||||
return client.CONFLICT, {}, None
|
||||
to_collection.upload(to_href, item.item)
|
||||
item.collection.delete(item.href)
|
||||
return client.CREATED, {}, None
|
||||
|
||||
from_collection = write_collections[0]
|
||||
from_name = xmlutils.name_from_path(
|
||||
environ["PATH_INFO"], from_collection)
|
||||
item = from_collection.get(from_name)
|
||||
if item:
|
||||
# Move the item
|
||||
to_url_parts = urlparse(environ["HTTP_DESTINATION"])
|
||||
if to_url_parts.netloc == environ["HTTP_HOST"]:
|
||||
to_url = to_url_parts.path
|
||||
to_path, to_name = to_url.rstrip("/").rsplit("/", 1)
|
||||
for to_collection in self.Collection.discover(
|
||||
to_path, depth="0"):
|
||||
if to_collection in write_collections:
|
||||
to_collection.upload(to_name, item)
|
||||
from_collection.delete(from_name)
|
||||
return client.CREATED, {}, None
|
||||
else:
|
||||
return NOT_ALLOWED
|
||||
else:
|
||||
# Remote destination server, not supported
|
||||
return client.BAD_GATEWAY, {}, None
|
||||
else:
|
||||
# No item found
|
||||
return client.GONE, {}, None
|
||||
|
||||
def do_OPTIONS(self, environ, read_collections, write_collections,
|
||||
content, user):
|
||||
def do_OPTIONS(self, environ, path, content, user):
|
||||
"""Manage OPTIONS request."""
|
||||
headers = {
|
||||
"Allow": ("DELETE, HEAD, GET, MKCALENDAR, MKCOL, MOVE, "
|
||||
@@ -542,94 +497,97 @@ class Application:
|
||||
"DAV": "1, 2, 3, calendar-access, addressbook, extended-mkcol"}
|
||||
return client.OK, headers, None
|
||||
|
||||
def do_PROPFIND(self, environ, read_collections, write_collections,
|
||||
content, user):
|
||||
def do_PROPFIND(self, environ, path, content, user):
|
||||
"""Manage PROPFIND request."""
|
||||
if not read_collections:
|
||||
return (client.NOT_FOUND, {}, None) if user else NOT_ALLOWED
|
||||
headers = {
|
||||
"DAV": "1, 2, 3, calendar-access, addressbook, extended-mkcol",
|
||||
"Content-Type": "text/xml"}
|
||||
answer = xmlutils.propfind(
|
||||
environ["PATH_INFO"], content, read_collections, write_collections,
|
||||
user)
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
with self._lock_collection("r", user):
|
||||
items = self.Collection.discover(path,
|
||||
environ.get("HTTP_DEPTH", "0"))
|
||||
read_items, write_items = self.collect_allowed_items(items, user)
|
||||
if not read_items and not write_items:
|
||||
return (client.NOT_FOUND, {}, None) if user else NOT_ALLOWED
|
||||
headers = {
|
||||
"DAV": "1, 2, 3, calendar-access, addressbook, extended-mkcol",
|
||||
"Content-Type": "text/xml"}
|
||||
answer = xmlutils.propfind(
|
||||
path, content, read_items, write_items, user)
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
|
||||
def do_PROPPATCH(self, environ, read_collections, write_collections,
|
||||
content, user):
|
||||
def do_PROPPATCH(self, environ, path, content, user):
|
||||
"""Manage PROPPATCH request."""
|
||||
if not write_collections:
|
||||
if not self.authorized(user, path, "w"):
|
||||
return NOT_ALLOWED
|
||||
with self._lock_collection("w", user):
|
||||
item = next(self.Collection.discover(path, depth="0"), None)
|
||||
if not isinstance(item, self.Collection):
|
||||
return client.CONFLICT, {}, None
|
||||
answer = xmlutils.proppatch(path, content, item)
|
||||
headers = {
|
||||
"DAV": "1, 2, 3, calendar-access, addressbook, extended-mkcol",
|
||||
"Content-Type": "text/xml"}
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
|
||||
collection = write_collections[0]
|
||||
|
||||
answer = xmlutils.proppatch(environ["PATH_INFO"], content, collection)
|
||||
headers = {
|
||||
"DAV": "1, 2, 3, calendar-access, addressbook, extended-mkcol",
|
||||
"Content-Type": "text/xml"}
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
|
||||
def do_PUT(self, environ, read_collections, write_collections, content,
|
||||
user):
|
||||
def do_PUT(self, environ, path, content, user):
|
||||
"""Manage PUT request."""
|
||||
if not write_collections:
|
||||
if not self._access(user, path, "w"):
|
||||
return NOT_ALLOWED
|
||||
|
||||
collection = write_collections[0]
|
||||
|
||||
content_type = environ.get("CONTENT_TYPE")
|
||||
if content_type:
|
||||
tags = {value: key for key, value in storage.MIMETYPES.items()}
|
||||
tag = tags.get(content_type.split(";")[0])
|
||||
if tag:
|
||||
collection.set_meta("tag", tag)
|
||||
headers = {}
|
||||
item_name = xmlutils.name_from_path(environ["PATH_INFO"], collection)
|
||||
item = collection.get(item_name)
|
||||
|
||||
etag = environ.get("HTTP_IF_MATCH", "")
|
||||
match = environ.get("HTTP_IF_NONE_MATCH", "") == "*"
|
||||
if (not item and not etag) or (
|
||||
item and ((etag or item.etag) == item.etag) and not match):
|
||||
# PUT allowed in 3 cases
|
||||
# Case 1: No item and no ETag precondition: Add new item
|
||||
# Case 2: Item and ETag precondition verified: Modify item
|
||||
# Case 3: Item and no Etag precondition: Force modifying item
|
||||
with self._lock_collection("w", user):
|
||||
parent_path = storage.sanitize_path(
|
||||
"/%s/" % posixpath.dirname(path.strip("/")))
|
||||
item = next(self.Collection.discover(path, depth="0"), None)
|
||||
parent_item = next(self.Collection.discover(
|
||||
parent_path, depth="0"), None)
|
||||
write_whole_collection = (
|
||||
isinstance(item, self.Collection) or
|
||||
not parent_item or
|
||||
not next(parent_item.list(), None) and
|
||||
parent_item.get_meta("tag") not in ("VADDRESSBOOK",
|
||||
"VCALENDAR"))
|
||||
if (write_whole_collection and
|
||||
not self.authorized(user, path, "w") or
|
||||
not write_whole_collection and
|
||||
not self.authorized(user, parent_path, "w")):
|
||||
return NOT_ALLOWED
|
||||
etag = environ.get("HTTP_IF_MATCH", "")
|
||||
match = environ.get("HTTP_IF_NONE_MATCH", "") == "*"
|
||||
if ((not item and etag) or (item and etag and item.etag != etag) or
|
||||
(item and match)):
|
||||
return client.PRECONDITION_FAILED, {}, None
|
||||
items = list(vobject.readComponents(content or ""))
|
||||
if item:
|
||||
# PUT is modifying an existing item
|
||||
if items:
|
||||
new_item = collection.update(item_name, items[0])
|
||||
else:
|
||||
new_item = None
|
||||
elif item_name:
|
||||
# PUT is adding a new item
|
||||
if items:
|
||||
new_item = collection.upload(item_name, items[0])
|
||||
else:
|
||||
new_item = None
|
||||
content_type = environ.get("CONTENT_TYPE")
|
||||
tag = None
|
||||
if content_type:
|
||||
tags = {value: key for key, value in storage.MIMETYPES.items()}
|
||||
tag = tags.get(content_type.split(";")[0])
|
||||
if write_whole_collection:
|
||||
if item:
|
||||
# Delete old collection
|
||||
item.delete()
|
||||
new_item = self.Collection.create_collection(path, items, tag)
|
||||
else:
|
||||
# PUT is replacing the whole collection
|
||||
collection.delete()
|
||||
new_item = self.Collection.create_collection(
|
||||
environ["PATH_INFO"], items)
|
||||
if new_item:
|
||||
headers["ETag"] = new_item.etag
|
||||
status = client.CREATED
|
||||
else:
|
||||
# PUT rejected in all other cases
|
||||
status = client.PRECONDITION_FAILED
|
||||
return status, headers, None
|
||||
if tag:
|
||||
parent_item.set_meta("tag", tag)
|
||||
href = posixpath.basename(path.strip("/"))
|
||||
if item:
|
||||
new_item = parent_item.update(href, items[0])
|
||||
else:
|
||||
new_item = parent_item.upload(href, items[0])
|
||||
headers = {"ETag": new_item.etag}
|
||||
return client.CREATED, headers, None
|
||||
|
||||
def do_REPORT(self, environ, read_collections, write_collections, content,
|
||||
user):
|
||||
def do_REPORT(self, environ, path, content, user):
|
||||
"""Manage REPORT request."""
|
||||
if not read_collections:
|
||||
if not self._access(user, path, "w"):
|
||||
return NOT_ALLOWED
|
||||
|
||||
collection = read_collections[0]
|
||||
|
||||
headers = {"Content-Type": "text/xml"}
|
||||
|
||||
answer = xmlutils.report(environ["PATH_INFO"], content, collection)
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
with self._lock_collection("r", user):
|
||||
item = next(self.Collection.discover(path, depth="0"), None)
|
||||
if not self._access(user, path, "w", item):
|
||||
return NOT_ALLOWED
|
||||
if not item:
|
||||
return client.NOT_FOUND, {}, None
|
||||
if isinstance(item, self.Collection):
|
||||
collection = item
|
||||
else:
|
||||
collection = item.collection
|
||||
headers = {"Content-Type": "text/xml"}
|
||||
answer = xmlutils.report(path, content, collection)
|
||||
return client.MULTI_STATUS, headers, answer
|
||||
|
||||
Reference in New Issue
Block a user