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/usr/share/pyshared/twisted/mail/pb.py is in python-twisted-mail 11.1.0-1.

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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


from twisted.spread import pb
from twisted.spread import banana

import os
import types

class Maildir(pb.Referenceable):

    def __init__(self, directory, rootDirectory):
        self.virtualDirectory = directory
        self.rootDirectory = rootDirectory
        self.directory = os.path.join(rootDirectory, directory)

    def getFolderMessage(self, folder, name):
        if '/' in name:
            raise IOError("can only open files in '%s' directory'" % folder)
        fp = open(os.path.join(self.directory, 'new', name))
        try:
            return fp.read()
        finally:
            fp.close()

    def deleteFolderMessage(self, folder, name):
        if '/' in name:
            raise IOError("can only delete files in '%s' directory'" % folder)
        os.rename(os.path.join(self.directory, folder, name),
                  os.path.join(self.rootDirectory, '.Trash', folder, name))

    def deleteNewMessage(self, name):
        return self.deleteFolderMessage('new', name)
    remote_deleteNewMessage = deleteNewMessage

    def deleteCurMessage(self, name):
        return self.deleteFolderMessage('cur', name)
    remote_deleteCurMessage = deleteCurMessage

    def getNewMessages(self):
        return os.listdir(os.path.join(self.directory, 'new'))
    remote_getNewMessages = getNewMessages

    def getCurMessages(self):
        return os.listdir(os.path.join(self.directory, 'cur'))
    remote_getCurMessages = getCurMessages

    def getNewMessage(self, name):
        return self.getFolderMessage('new', name)
    remote_getNewMessage = getNewMessage

    def getCurMessage(self, name):
        return self.getFolderMessage('cur', name)
    remote_getCurMessage = getCurMessage

    def getSubFolder(self, name):
        if name[0] == '.':
            raise IOError("subfolder name cannot begin with a '.'")
        name = name.replace('/', ':')
        if self.virtualDirectoy == '.':
            name = '.'+name
        else:
            name = self.virtualDirectory+':'+name
        if not self._isSubFolder(name):
            raise IOError("not a subfolder")
        return Maildir(name, self.rootDirectory)
    remote_getSubFolder = getSubFolder

    def _isSubFolder(self, name):
        return (not os.path.isdir(os.path.join(self.rootDirectory, name)) or
                not os.path.isfile(os.path.join(self.rootDirectory, name,
                                                'maildirfolder')))


class MaildirCollection(pb.Referenceable):

    def __init__(self, root):
        self.root = root

    def getSubFolders(self):
        return os.listdir(self.getRoot())
    remote_getSubFolders = getSubFolders

    def getSubFolder(self, name):
        if '/' in name or name[0] == '.':
            raise IOError("invalid name")
        return Maildir('.', os.path.join(self.getRoot(), name))
    remote_getSubFolder = getSubFolder


class MaildirBroker(pb.Broker):

    def proto_getCollection(self, requestID, name, domain, password):
        collection = self._getCollection()
        if collection is None:
            self.sendError(requestID, "permission denied")
        else:
            self.sendAnswer(requestID, collection)

    def getCollection(self, name, domain, password):
        if not self.domains.has_key(domain):
            return
        domain = self.domains[domain]
        if (domain.dbm.has_key(name) and
            domain.dbm[name] == password):
            return MaildirCollection(domain.userDirectory(name))


class MaildirClient(pb.Broker):

    def getCollection(self, name, domain, password, callback, errback):
        requestID = self.newRequestID()
        self.waitingForAnswers[requestID] = callback, errback
        self.sendCall("getCollection", requestID, name, domain, password)