/usr/share/pyshared/DAV/locks.py is in python-webdav 0.9.4.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
#This library is free software; you can redistribute it and/or
#modify it under the terms of the GNU Library General Public
#License as published by the Free Software Foundation; either
#version 2 of the License, or (at your option) any later version.
#
#This library is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#Library General Public License for more details.
#
#You should have received a copy of the GNU Library General Public
#License along with this library; if not, write to the Free
#Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
#MA 02111-1307, USA
import os
import sys
import time
import socket
import string
import posixpath
import base64
import urlparse
import urllib
import random
import logging
log = logging.getLogger(__name__)
import xml.dom
from xml.dom import minidom
from utils import rfc1123_date, IfParser, tokenFinder
from string import atoi,split
from errors import *
tokens_to_lock = {}
uris_to_token = {}
class LockManager:
""" Implements the locking backend and serves as MixIn for DAVRequestHandler """
def _init_locks(self):
return tokens_to_lock, uris_to_token
def _l_isLocked(self, uri):
tokens, uris = self._init_locks()
return uris.has_key(uri)
def _l_hasLock(self, token):
tokens, uris = self._init_locks()
return tokens.has_key(token)
def _l_getLockForUri(self, uri):
tokens, uris = self._init_locks()
return uris.get(uri, None)
def _l_getLock(self, token):
tokens, uris = self._init_locks()
return tokens.get(token, None)
def _l_delLock(self, token):
tokens, uris = self._init_locks()
if tokens.has_key(token):
del uris[tokens[token].uri]
del tokens[token]
def _l_setLock(self, lock):
tokens, uris = self._init_locks()
tokens[lock.token] = lock
uris[lock.uri] = lock
def _lock_unlock_parse(self, body):
doc = minidom.parseString(body)
data = {}
info = doc.getElementsByTagNameNS('DAV:', 'lockinfo')[0]
data['lockscope'] = info.getElementsByTagNameNS('DAV:', 'lockscope')[0]\
.firstChild.localName
data['locktype'] = info.getElementsByTagNameNS('DAV:', 'locktype')[0]\
.firstChild.localName
data['lockowner'] = info.getElementsByTagNameNS('DAV:', 'owner')
return data
def _lock_unlock_create(self, uri, creator, depth, data):
lock = LockItem(uri, creator, **data)
iscollection = uri[-1] == '/' # very dumb collection check
result = ''
if depth == 'infinity' and iscollection:
# locking of children/collections not yet supported
pass
if not self._l_isLocked(uri):
self._l_setLock(lock)
# because we do not handle children we leave result empty
return lock.token, result
def do_UNLOCK(self):
""" Unlocks given resource """
dc = self.IFACE_CLASS
if self._config.DAV.getboolean('verbose') is True:
log.info('UNLOCKing resource %s' % self.headers)
uri = urlparse.urljoin(self.get_baseuri(dc), self.path)
uri = urllib.unquote(uri)
token = tokenFinder(self.headers.get('Lock-Token'))
if self._l_isLocked(uri):
self._l_delLock(token)
self.send_body(None, '204', 'Ok', 'Ok')
def do_LOCK(self):
""" Locking is implemented via in-memory caches. No data is written to disk. """
dc = self.IFACE_CLASS
log.debug('LOCKing resource %s' % self.headers)
body = None
if self.headers.has_key('Content-Length'):
l = self.headers['Content-Length']
body = self.rfile.read(atoi(l))
depth = self.headers.get('Depth', 'infinity')
uri = urlparse.urljoin(self.get_baseuri(dc), self.path)
uri = urllib.unquote(uri)
log.debug('do_LOCK: uri = %s' % uri)
ifheader = self.headers.get('If')
alreadylocked = self._l_isLocked(uri)
log.debug('do_LOCK: alreadylocked = %s' % alreadylocked)
if body and alreadylocked:
# Full LOCK request but resource already locked
self.responses[423] = ('Locked', 'Already locked')
return self.send_status(423)
elif body and not ifheader:
# LOCK with XML information
data = self._lock_unlock_parse(body)
token, result = self._lock_unlock_create(uri, 'unknown', depth, data)
if result:
self.send_body(result, '207', 'Error', 'Error',
'text/xml; charset="utf-8"')
else:
lock = self._l_getLock(token)
self.send_body(lock.asXML(), '200', 'OK', 'OK',
'text/xml; charset="utf-8"',
{'Lock-Token' : '<opaquelocktoken:%s>' % token})
else:
# refresh request - refresh lock timeout
taglist = IfParser(ifheader)
found = 0
for tag in taglist:
for listitem in tag.list:
token = tokenFinder(listitem)
if token and self._l_hasLock(token):
lock = self._l_getLock(token)
timeout = self.headers.get('Timeout', 'Infinite')
lock.setTimeout(timeout) # automatically refreshes
found = 1
self.send_body(lock.asXML(),
'200', 'OK', 'OK', 'text/xml; encoding="utf-8"')
break
if found:
break
# we didn't find any of the tokens mentioned - means
# that table was cleared or another error
if not found:
self.send_status(412) # precondition failed
class LockItem:
""" Lock with support for exclusive write locks. Some code taken from
webdav.LockItem from the Zope project. """
def __init__(self, uri, creator, lockowner, depth=0, timeout='Infinite',
locktype='write', lockscope='exclusive', token=None, **kw):
self.uri = uri
self.creator = creator
self.owner = lockowner
self.depth = depth
self.timeout = timeout
self.locktype = locktype
self.lockscope = lockscope
self.token = token and token or self.generateToken()
self.modified = time.time()
def getModifiedTime(self):
return self.modified
def refresh(self):
self.modified = time.time()
def isValid(self):
now = time.time()
modified = self.modified
timeout = self.timeout
return (modified + timeout) > now
def generateToken(self):
_randGen = random.Random(time.time())
return '%s-%s-00105A989226:%.03f' % \
(_randGen.random(),_randGen.random(),time.time())
def getTimeoutString(self):
t = str(self.timeout)
if t[-1] == 'L': t = t[:-1]
return 'Second-%s' % t
def setTimeout(self, timeout):
self.timeout = timeout
self.modified = time.time()
def asXML(self, namespace='d', discover=False):
owner_str = ''
if isinstance(self.owner, str):
owner_str = self.owner
elif isinstance(self.owner, xml.dom.minicompat.NodeList):
owner_str = "".join([node.toxml() for node in self.owner[0].childNodes])
token = self.token
base = ('<%(ns)s:activelock>\n'
' <%(ns)s:locktype><%(ns)s:%(locktype)s/></%(ns)s:locktype>\n'
' <%(ns)s:lockscope><%(ns)s:%(lockscope)s/></%(ns)s:lockscope>\n'
' <%(ns)s:depth>%(depth)s</%(ns)s:depth>\n'
' <%(ns)s:owner>%(owner)s</%(ns)s:owner>\n'
' <%(ns)s:timeout>%(timeout)s</%(ns)s:timeout>\n'
' <%(ns)s:locktoken>\n'
' <%(ns)s:href>opaquelocktoken:%(locktoken)s</%(ns)s:href>\n'
' </%(ns)s:locktoken>\n'
' </%(ns)s:activelock>\n'
) % {
'ns': namespace,
'locktype': self.locktype,
'lockscope': self.lockscope,
'depth': self.depth,
'owner': owner_str,
'timeout': self.getTimeoutString(),
'locktoken': token,
}
if discover is True:
return base
s = """<?xml version="1.0" encoding="utf-8" ?>
<d:prop xmlns:d="DAV:">
<d:lockdiscovery>
%s
</d:lockdiscovery>
</d:prop>""" % base
return s
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