/usr/lib/python2.7/dist-packages/twext/web2/dav/http.py is in calendarserver 5.2+dfsg-1.
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# Copyright (c) 2005-2014 Apple Computer, Inc. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
##
"""
HTTP Utilities
"""
__all__ = [
"ErrorResponse",
"NeedPrivilegesResponse",
"MultiStatusResponse",
"ResponseQueue",
"PropertyStatusResponseQueue",
"statusForFailure",
"errorForFailure",
"messageForFailure",
]
import errno
from twisted.python.failure import Failure
from twisted.python.filepath import InsecurePath
from twext.python.log import Logger
from twext.web2 import responsecode
from twext.web2.iweb import IResponse
from twext.web2.http import Response, HTTPError, StatusResponse
from twext.web2.http_headers import MimeType
from twext.web2.dav.util import joinURL
from txdav.xml import element
log = Logger()
class ErrorResponse(Response):
"""
A L{Response} object which contains a status code and a L{element.Error}
element.
Renders itself as a DAV:error XML document.
"""
error = None
unregistered = True # base class is already registered
def __init__(self, code, error, description=None):
"""
@param code: a response code.
@param error: an L{WebDAVElement} identifying the error, or a
tuple C{(namespace, name)} with which to create an empty element
denoting the error. (The latter is useful in the case of
preconditions ans postconditions, not all of which have defined
XML element classes.)
@param description: an optional string that, if present, will get
wrapped in a (twisted_dav_namespace, error-description) element.
"""
if type(error) is tuple:
xml_namespace, xml_name = error
error = element.WebDAVUnknownElement()
error.namespace = xml_namespace
error.name = xml_name
self.description = description
if self.description:
output = element.Error(error, element.ErrorDescription(self.description)).toxml()
else:
output = element.Error(error).toxml()
Response.__init__(self, code=code, stream=output)
self.headers.setHeader("content-type", MimeType("text", "xml"))
self.error = error
def __repr__(self):
return "<%s %s %s>" % (self.__class__.__name__, self.code, self.error.sname())
class NeedPrivilegesResponse (ErrorResponse):
def __init__(self, base_uri, errors):
"""
An error response which is due to unsufficient privileges, as
determined by L{DAVResource.checkPrivileges}.
@param base_uri: the base URI for the resources with errors (the URI of
the resource on which C{checkPrivileges} was called).
@param errors: a sequence of tuples, as returned by
C{checkPrivileges}.
"""
denials = []
for subpath, privileges in errors:
if subpath is None:
uri = base_uri
else:
uri = joinURL(base_uri, subpath)
for p in privileges:
denials.append(element.Resource(element.HRef(uri),
element.Privilege(p)))
super(NeedPrivilegesResponse, self).__init__(responsecode.FORBIDDEN, element.NeedPrivileges(*denials))
class MultiStatusResponse (Response):
"""
Multi-status L{Response} object.
Renders itself as a DAV:multi-status XML document.
"""
def __init__(self, xml_responses):
"""
@param xml_responses: an interable of element.Response objects.
"""
Response.__init__(self, code=responsecode.MULTI_STATUS,
stream=element.MultiStatus(*xml_responses).toxml())
self.headers.setHeader("content-type", MimeType("text", "xml"))
class ResponseQueue (object):
"""
Stores a list of (typically error) responses for use in a
L{MultiStatusResponse}.
"""
def __init__(self, path_basename, method, success_response):
"""
@param path_basename: the base path for all responses to be added to the
queue.
All paths for responses added to the queue must start with
C{path_basename}, which will be stripped from the beginning of each
path to determine the response's URI.
@param method: the name of the method generating the queue.
@param success_response: the response to return in lieu of a
L{MultiStatusResponse} if no responses are added to this queue.
"""
self.responses = []
self.path_basename = path_basename
self.path_basename_len = len(path_basename)
self.method = method
self.success_response = success_response
def add(self, path, what):
"""
Add a response.
@param path: a path, which must be a subpath of C{path_basename} as
provided to L{__init__}.
@param what: a status code or a L{Failure} for the given path.
"""
assert path.startswith(self.path_basename), "%s does not start with %s" % (path, self.path_basename)
if type(what) is int:
code = what
error = None
message = responsecode.RESPONSES[code]
elif isinstance(what, Failure):
code = statusForFailure(what)
error = errorForFailure(what)
message = messageForFailure(what)
else:
raise AssertionError("Unknown data type: %r" % (what,))
if code > 400: # Error codes only
log.error("Error during %s for %s: %s" % (self.method, path, message))
uri = path[self.path_basename_len:]
children = []
children.append(element.HRef(uri))
children.append(element.Status.fromResponseCode(code))
if error is not None:
children.append(error)
if message is not None:
children.append(element.ResponseDescription(message))
self.responses.append(element.StatusResponse(*children))
def response(self):
"""
Generate a L{MultiStatusResponse} with the responses contained in the
queue or, if no such responses, return the C{success_response} provided
to L{__init__}.
@return: the response.
"""
if self.responses:
return MultiStatusResponse(self.responses)
else:
return self.success_response
class PropertyStatusResponseQueue (object):
"""
Stores a list of propstat elements for use in a L{Response}
in a L{MultiStatusResponse}.
"""
def __init__(self, method, uri, success_response):
"""
@param method: the name of the method generating the queue.
@param uri: the URI for the response.
@param success_response: the status to return if no
L{PropertyStatus} are added to this queue.
"""
self.method = method
self.uri = uri
self.propstats = []
self.success_response = success_response
def add(self, what, property):
"""
Add a response.
@param what: a status code or a L{Failure} for the given path.
@param property: the property whose status is being reported.
"""
if type(what) is int:
code = what
error = None
message = responsecode.RESPONSES[code]
elif isinstance(what, Failure):
code = statusForFailure(what)
error = errorForFailure(what)
message = messageForFailure(what)
else:
raise AssertionError("Unknown data type: %r" % (what,))
if len(property.children) > 0:
# Re-instantiate as empty element.
property = element.WebDAVUnknownElement.withName(property.namespace, property.name)
if code > 400: # Error codes only
log.error("Error during %s for %s: %s" % (self.method, property, message))
children = []
children.append(element.PropertyContainer(property))
children.append(element.Status.fromResponseCode(code))
if error is not None:
children.append(error)
if message is not None:
children.append(element.ResponseDescription(message))
self.propstats.append(element.PropertyStatus(*children))
def error(self):
"""
Convert any 2xx codes in the propstat responses to 424 Failed Dependency.
"""
for index, propstat in enumerate(self.propstats):
# Check the status
changed_status = False
newchildren = []
for child in propstat.children:
if isinstance(child, element.Status) and (child.code / 100 == 2):
# Change the code
newchildren.append(element.Status.fromResponseCode(responsecode.FAILED_DEPENDENCY))
changed_status = True
elif changed_status and isinstance(child, element.ResponseDescription):
newchildren.append(element.ResponseDescription(responsecode.RESPONSES[responsecode.FAILED_DEPENDENCY]))
else:
newchildren.append(child)
self.propstats[index] = element.PropertyStatus(*newchildren)
def response(self):
"""
Generate a response from the responses contained in the queue or, if
there are no such responses, return the C{success_response} provided to
L{__init__}.
@return: a L{element.PropertyStatusResponse}.
"""
if self.propstats:
return element.PropertyStatusResponse(
element.HRef(self.uri),
*self.propstats
)
else:
return element.StatusResponse(
element.HRef(self.uri),
element.Status.fromResponseCode(self.success_response)
)
##
# Exceptions and response codes
##
def statusForFailure(failure, what=None):
"""
@param failure: a L{Failure}.
@param what: a decription of what was going on when the failure occurred.
If what is not C{None}, emit a cooresponding message via L{log.err}.
@return: a response code cooresponding to the given C{failure}.
"""
def msg(err):
if what is not None:
log.debug("%s while %s" % (err, what))
if failure.check(IOError, OSError):
e = failure.value[0]
if e == errno.EACCES or e == errno.EPERM:
msg("Permission denied")
return responsecode.FORBIDDEN
elif e == errno.ENOSPC:
msg("Out of storage space")
return responsecode.INSUFFICIENT_STORAGE_SPACE
elif e == errno.ENOENT:
msg("Not found")
return responsecode.NOT_FOUND
else:
failure.raiseException()
elif failure.check(NotImplementedError):
msg("Unimplemented error")
return responsecode.NOT_IMPLEMENTED
elif failure.check(InsecurePath):
msg("Insecure path")
return responsecode.FORBIDDEN
elif failure.check(HTTPError):
code = IResponse(failure.value.response).code
msg("%d response" % (code,))
return code
else:
failure.raiseException()
def errorForFailure(failure):
if failure.check(HTTPError) and isinstance(failure.value.response, ErrorResponse):
return element.Error(failure.value.response.error)
else:
return None
def messageForFailure(failure):
if failure.check(HTTPError):
if isinstance(failure.value.response, ErrorResponse):
return failure.value.response.description
elif isinstance(failure.value.response, StatusResponse):
return failure.value.response.description
return str(failure)
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