/usr/lib/python2.7/dist-packages/twext/who/directory.py is in python-twext 0.1.b2.dev15059-1.
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##
# Copyright (c) 2006-2015 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Generic directory service base implementation
"""
__all__ = [
"DirectoryService",
"DirectoryRecord",
]
from zope.interface import implementer, directlyProvides
from twisted.python.constants import (
Names, NamedConstant,
Values, ValueConstant,
Flags, FlagConstant,
)
from twisted.internet.defer import inlineCallbacks, returnValue
from twisted.internet.defer import succeed, fail
from twisted.cred.credentials import DigestedCredentials
from .idirectory import (
InvalidDirectoryRecordError,
QueryNotSupportedError, NotAllowedError,
FieldName, RecordType,
IDirectoryService, IDirectoryRecord,
IPlaintextPasswordVerifier, IHTTPDigestVerifier,
)
from .expression import CompoundExpression, Operand, MatchExpression
from .util import uniqueResult, describe, ConstantsContainer
@implementer(IDirectoryService)
class DirectoryService(object):
"""
Generic (and abstract) implementation of L{IDirectoryService}.
Most of the C{recordsWith*} methods call L{recordsWithFieldValue}, which in
turn calls L{recordsFromExpression} with a corresponding
L{MatchExpression}.
L{recordsFromExpression} relies on L{recordsFromNonCompoundExpression} for
all expression types other than L{CompoundExpression}, which it handles
directly.
L{recordsFromNonCompoundExpression} (and therefore most uses of the other
methods) will always fail with a L{QueryNotSupportedError}.
A subclass should therefore override L{recordsFromNonCompoundExpression}
with an implementation that handles any queries that it can support (which
should include L{MatchExpression}) and calls its superclass' implementation
with any query it cannot support.
A subclass may override L{recordsFromExpression} if it is to support
L{CompoundExpression}s with operands other than L{Operand.AND} and
L{Operand.OR}.
A subclass may override L{recordsFromExpression} if it is built on top
of a directory service that supports compound expressions, as that may be
more effient than relying on L{DirectoryService}'s implementation.
L{updateRecords} and L{removeRecords} will fail with L{NotAllowedError}
when asked to modify data.
A subclass should override these methods if is to allow editing of
directory information.
@cvar recordType: a L{Names} class or compatible object (eg.
L{ConstantsContainer}) which contains the L{NamedConstant}s denoting
the record types that are supported by this directory service.
@cvar fieldName: a L{Names} class or compatible object (eg.
L{ConstantsContainer}) which contains the L{NamedConstant}s denoting
the record field names that are supported by this directory service.
@cvar normalizedFields: a L{dict} mapping of (ie. L{NamedConstant}s
contained in the C{fieldName} class variable) to callables that take
a field value (a L{unicode}) and return a normalized field value (also
a L{unicode}).
"""
recordType = ConstantsContainer(())
fieldName = FieldName
normalizedFields = {
FieldName.emailAddresses: lambda e: e.lower(),
}
def __init__(self, realmName):
"""
@param realmName: a realm name
@type realmName: L{unicode}
"""
self.realmName = realmName
def __repr__(self):
return (
"<{self.__class__.__name__} {self.realmName!r}>"
.format(self=self)
)
def recordTypes(self):
return self.recordType.iterconstants()
def recordsFromNonCompoundExpression(
self, expression, recordTypes=None, records=None,
limitResults=None, timeoutSeconds=None
):
"""
Finds records matching a non-compound expression.
@note: This method is called by L{recordsFromExpression} to handle
all expressions other than L{CompoundExpression}.
This implementation always fails with L{QueryNotSupportedError}.
Subclasses should override this in order to handle additional
expression types, and call on the superclass' implementation
for other expression types.
@note: This interface is the same as L{recordsFromExpression}, except
for the additional C{records} argument.
@param expression: an expression to apply
@type expression: L{object}
@param recordTypes: the record types to match
@type recordTypes: an iterable of L{NamedConstant}, or None for no
filtering
@param records: a set of records to limit the search to. C{None} if
the whole directory should be searched.
This is provided by L{recordsFromExpression} when it has already
narrowed down results to a set of records.
That is, it's a performance optimization; ignoring this and
searching the entire directory will also work.
@type records: L{set} or L{frozenset}
@return: The matching records.
@rtype: deferred iterable of L{IDirectoryRecord}s
@raises: L{QueryNotSupportedError} if the expression is not
supported by this directory service.
"""
if records is not None:
for _ignore_record in records:
break
else:
return succeed(())
return fail(QueryNotSupportedError(
"Unknown expression: {0}".format(expression)
))
@inlineCallbacks
def recordsFromCompoundExpression(
self, expression, recordTypes=None, records=None,
limitResults=None, timeoutSeconds=None
):
"""
Finds records matching a compound expression.
@note: This method is called by L{recordsFromExpression} to handle
all L{CompoundExpression}s.
@note: This interface is the same as L{recordsFromExpression}, except
for the additional C{records} argument.
@param expression: an expression to apply
@type expression: L{CompoundExpression}
@param recordTypes: the record types to match
@type recordTypes: an iterable of L{NamedConstant}, or None for no
filtering
@param records: a set of records to limit the search to. C{None} if
the whole directory should be searched.
This is provided by L{recordsFromExpression} when it has already
narrowed down results to a set of records.
That is, it's a performance optimization; ignoring this and
searching the entire directory will also work.
@type records: L{set} or L{frozenset}
@return: The matching records.
@rtype: deferred iterable of L{IDirectoryRecord}s
@raises: L{QueryNotSupportedError} if the expression is not
supported by this directory service.
"""
operand = expression.operand
subExpressions = iter(expression.expressions)
try:
subExpression = subExpressions.next()
except StopIteration:
returnValue(())
results = set((
yield self.recordsFromExpression(
subExpression, recordTypes=recordTypes, records=records
)
))
for subExpression in subExpressions:
if operand == Operand.AND:
if not results:
# No need to bother continuing here
returnValue(())
records = results
else:
records = None
recordsMatchingExpression = frozenset((
yield self.recordsFromExpression(
subExpression, recordTypes=recordTypes, records=records
)
))
if operand == Operand.AND:
results &= recordsMatchingExpression
elif operand == Operand.OR:
results |= recordsMatchingExpression
else:
raise QueryNotSupportedError(
"Unknown operand: {0}".format(operand)
)
returnValue(results)
def recordsFromExpression(
self, expression, recordTypes=None, records=None,
limitResults=None, timeoutSeconds=None
):
"""
@note: This interface is the same as
L{IDirectoryService.recordsFromExpression}, except for the
additional C{records} argument.
"""
if isinstance(expression, CompoundExpression):
return self.recordsFromCompoundExpression(
expression, recordTypes=recordTypes,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
else:
return self.recordsFromNonCompoundExpression(
expression, recordTypes=recordTypes,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
def recordsWithFieldValue(
self, fieldName, value, recordTypes=None,
limitResults=None, timeoutSeconds=None
):
return self.recordsFromExpression(
MatchExpression(fieldName, value),
recordTypes=recordTypes,
limitResults=limitResults,
timeoutSeconds=timeoutSeconds
)
@inlineCallbacks
def recordWithUID(self, uid, timeoutSeconds=None):
returnValue(uniqueResult(
(yield self.recordsWithFieldValue(
FieldName.uid, uid, timeoutSeconds=timeoutSeconds
))
))
@inlineCallbacks
def recordWithGUID(self, guid, timeoutSeconds=None):
returnValue(uniqueResult(
(yield self.recordsWithFieldValue(
FieldName.guid, guid, timeoutSeconds=timeoutSeconds
))
))
def recordsWithRecordType(
self, recordType, limitResults=None, timeoutSeconds=None
):
return self.recordsWithFieldValue(
FieldName.recordType, recordType,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
@inlineCallbacks
def recordWithShortName(self, recordType, shortName, timeoutSeconds=None):
returnValue(
uniqueResult(
(
yield self.recordsFromExpression(
MatchExpression(
FieldName.shortNames, shortName
),
recordTypes=[recordType],
timeoutSeconds=timeoutSeconds
)
)
)
)
def recordsWithEmailAddress(
self, emailAddress, limitResults=None, timeoutSeconds=None
):
return self.recordsWithFieldValue(
FieldName.emailAddresses,
emailAddress,
limitResults=limitResults,
timeoutSeconds=timeoutSeconds
)
def updateRecords(self, records, create=False):
for _ignore_record in records:
return fail(NotAllowedError("Record updates not allowed."))
return succeed(None)
def removeRecords(self, uids):
for _ignore_uid in uids:
return fail(NotAllowedError("Record removal not allowed."))
return succeed(None)
def flush(self):
return succeed(None)
@implementer(IDirectoryRecord)
class DirectoryRecord(object):
"""
Generic implementation of L{IDirectoryService}.
This is an incomplete implementation of L{IDirectoryRecord}.
L{groups} will always fail with L{NotImplementedError} and L{members} will
do so if this is a group record.
A subclass should override these methods to support group membership and
complete this implementation.
@cvar requiredFields: an iterable of field names that must be present in
all directory records.
"""
requiredFields = (
FieldName.uid,
FieldName.recordType,
)
def __init__(self, service, fields):
for fieldName in self.requiredFields:
if fieldName not in fields or not fields[fieldName]:
raise InvalidDirectoryRecordError(
"{0} field is required.".format(fieldName),
fields
)
if service.fieldName.isMultiValue(fieldName):
values = fields[fieldName]
for value in values:
if not value:
raise InvalidDirectoryRecordError(
"{0} field must not be empty.".format(fieldName),
fields
)
if (
fields[FieldName.recordType] not in
service.recordType.iterconstants()
):
raise InvalidDirectoryRecordError(
"Unknown record type: {0!r} is not in {1!r}.".format(
fields[FieldName.recordType],
tuple(service.recordType.iterconstants()),
),
fields
)
def checkType(name, value):
expectedType = service.fieldName.valueType(name)
if issubclass(expectedType, Flags):
expectedType = FlagConstant
elif issubclass(expectedType, Values):
expectedType = ValueConstant
elif issubclass(expectedType, Names):
expectedType = NamedConstant
if value is not None and not isinstance(value, expectedType):
raise InvalidDirectoryRecordError(
"Value {0!r} for field {1} is not of type {2}".format(
value, name, expectedType
),
fields
)
# Normalize fields
normalizedFields = {}
for name, value in fields.items():
if not isinstance(name, NamedConstant):
raise InvalidDirectoryRecordError(
"Field name {} is not a named constant".format(name),
fields
)
normalize = service.normalizedFields.get(name, None)
if normalize is None:
normalizedValue = value
else:
if service.fieldName.isMultiValue(name):
normalizedValue = tuple((normalize(v) for v in value))
else:
normalizedValue = normalize(value)
if service.fieldName.isMultiValue(name):
for v in normalizedValue:
checkType(name, v)
else:
checkType(name, normalizedValue)
normalizedFields[name] = normalizedValue
self.service = service
self.fields = normalizedFields
if self.service.fieldName.password in self.fields:
directlyProvides(
self, IPlaintextPasswordVerifier, IHTTPDigestVerifier
)
def __repr__(self):
try:
return (
"<{self.__class__.__name__} ({recordType}){shortName}>".format(
self=self,
recordType=describe(self.recordType),
shortName=self.shortNames[0],
)
)
except (AttributeError, IndexError):
return (
"<{self.__class__.__name__} {uid}>".format(
self=self,
uid=self.uid,
)
)
def __hash__(self):
return hash(self.uid)
def __eq__(self, other):
if IDirectoryRecord.implementedBy(other.__class__):
return (
self.service == other.service and
self.fields == other.fields
)
return NotImplemented
def __ne__(self, other):
eq = self.__eq__(other)
if eq is NotImplemented:
return NotImplemented
return not eq
def __getattr__(self, name):
try:
fieldName = self.service.fieldName.lookupByName(name)
except ValueError:
raise AttributeError(name)
try:
return self.fields[fieldName]
except KeyError:
raise AttributeError(name)
def description(self):
"""
Generate a string description of this directory record.
@return: A description.
@rtype: L{unicode}
"""
def describeValue(value):
if hasattr(value, "description"):
value = value.description
else:
value = unicode(value)
return value
values = {}
for fieldName in self.service.fieldName.iterconstants():
if fieldName not in self.fields:
continue
value = self.fields[fieldName]
if hasattr(fieldName, "description"):
name = fieldName.description
else:
name = unicode(fieldName.name)
if self.service.fieldName.isMultiValue(fieldName):
values[name] = ", ".join(describeValue(v) for v in value)
else:
values[name] = describeValue(value)
description = [self.__class__.__name__, u":"]
for name in sorted(values.iterkeys()):
description.append(u"\n {0} = {1}".format(name, values[name]))
description.append(u"\n")
return u"".join(description)
def members(self):
if self.recordType == RecordType.group:
return fail(
NotImplementedError("Subclasses must implement members()")
)
return succeed(())
def groups(self):
return fail(NotImplementedError("Subclasses must implement groups()"))
def addMembers(self, members):
return fail(NotAllowedError("Membership updates not allowed."))
def removeMembers(self, members):
return fail(NotAllowedError("Membership updates not allowed."))
def setMembers(self, members):
return fail(NotAllowedError("Membership updates not allowed."))
#
# Verifiers for twext.who.checker stuff.
#
def verifyPlaintextPassword(self, password):
if self.password == password:
return succeed(True)
else:
return succeed(False)
def verifyHTTPDigest(
self, username, realm, uri, nonce, cnonce,
algorithm, nc, qop, response, method,
):
helperCreds = DigestedCredentials(
username, method, realm,
dict(
realm=realm,
uri=uri,
nonce=nonce,
cnonce=cnonce,
algorithm=algorithm,
nc=nc,
qop=qop,
response=response
)
)
return succeed(helperCreds.checkPassword(self.password))
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