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# -*- test-case-name: twisted.test.test_strcred -*-
#
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Cred plugin for a file of the format 'username:password'.
"""
from __future__ import absolute_import, division
import sys
from zope.interface import implementer
from twisted import plugin
from twisted.cred.checkers import FilePasswordDB
from twisted.cred.strcred import ICheckerFactory
from twisted.cred.credentials import IUsernamePassword, IUsernameHashedPassword
fileCheckerFactoryHelp = """
This checker expects to receive the location of a file that
conforms to the FilePasswordDB format. Each line in the file
should be of the format 'username:password', in plain text.
"""
invalidFileWarning = 'Warning: not a valid file'
@implementer(ICheckerFactory, plugin.IPlugin)
class FileCheckerFactory(object):
"""
A factory for instances of L{FilePasswordDB}.
"""
authType = 'file'
authHelp = fileCheckerFactoryHelp
argStringFormat = 'Location of a FilePasswordDB-formatted file.'
# Explicitly defined here because FilePasswordDB doesn't do it for us
credentialInterfaces = (IUsernamePassword, IUsernameHashedPassword)
errorOutput = sys.stderr
def generateChecker(self, argstring):
"""
This checker factory expects to get the location of a file.
The file should conform to the format required by
L{FilePasswordDB} (using defaults for all
initialization parameters).
"""
from twisted.python.filepath import FilePath
if not argstring.strip():
raise ValueError('%r requires a filename' % self.authType)
elif not FilePath(argstring).isfile():
self.errorOutput.write('%s: %s\n' % (invalidFileWarning, argstring))
return FilePasswordDB(argstring)
theFileCheckerFactory = FileCheckerFactory()