move server to its own file

1 files changed, 199 insertions, 0 deletions

diff --git a/src/leap/mail/imap/server.py b/src/leap/mail/imap/server.py
new file mode 100644
index 0000000..8bd875b
--- /dev/null
+++ b/src/leap/mail/imap/server.py
@@ -0,0 +1,199 @@
+# -*- coding: utf-8 -*-
+# server.py
+# Copyright (C) 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Leap IMAP4 Server Implementation.
+"""
+from copy import copy
+
+from twisted import cred
+from twisted.internet.defer import maybeDeferred
+from twisted.internet.task import deferLater
+from twisted.mail import imap4
+from twisted.python import log
+
+from leap.common import events as leap_events
+from leap.common.check import leap_assert, leap_assert_type
+from leap.common.events.events_pb2 import IMAP_CLIENT_LOGIN
+from leap.soledad.client import Soledad
+
+
+class LeapIMAPServer(imap4.IMAP4Server):
+    """
+    An IMAP4 Server with mailboxes backed by soledad
+    """
+    def __init__(self, *args, **kwargs):
+        # pop extraneous arguments
+        soledad = kwargs.pop('soledad', None)
+        uuid = kwargs.pop('uuid', None)
+        userid = kwargs.pop('userid', None)
+        leap_assert(soledad, "need a soledad instance")
+        leap_assert_type(soledad, Soledad)
+        leap_assert(uuid, "need a user in the initialization")
+
+        self._userid = userid
+
+        # initialize imap server!
+        imap4.IMAP4Server.__init__(self, *args, **kwargs)
+
+        # we should initialize the account here,
+        # but we move it to the factory so we can
+        # populate the test account properly (and only once
+        # per session)
+
+    def lineReceived(self, line):
+        """
+        Attempt to parse a single line from the server.
+
+        :param line: the line from the server, without the line delimiter.
+        :type line: str
+        """
+        if self.theAccount.closed is True and self.state != "unauth":
+            log.msg("Closing the session. State: unauth")
+            self.state = "unauth"
+
+        if "login" in line.lower():
+            # avoid to log the pass, even though we are using a dummy auth
+            # by now.
+            msg = line[:7] + " [...]"
+        else:
+            msg = copy(line)
+        log.msg('rcv (%s): %s' % (self.state, msg))
+        imap4.IMAP4Server.lineReceived(self, line)
+
+    def authenticateLogin(self, username, password):
+        """
+        Lookup the account with the given parameters, and deny
+        the improper combinations.
+
+        :param username: the username that is attempting authentication.
+        :type username: str
+        :param password: the password to authenticate with.
+        :type password: str
+        """
+        # XXX this should use portal:
+        # return portal.login(cred.credentials.UsernamePassword(user, pass)
+        if username != self._userid:
+            # bad username, reject.
+            raise cred.error.UnauthorizedLogin()
+        # any dummy password is allowed so far. use realm instead!
+        leap_events.signal(IMAP_CLIENT_LOGIN, "1")
+        return imap4.IAccount, self.theAccount, lambda: None
+
+    def do_FETCH(self, tag, messages, query, uid=0):
+        """
+        Overwritten fetch dispatcher to use the fast fetch_flags
+        method
+        """
+        from twisted.internet import reactor
+        if not query:
+            self.sendPositiveResponse(tag, 'FETCH complete')
+            return  # XXX ???
+
+        cbFetch = self._IMAP4Server__cbFetch
+        ebFetch = self._IMAP4Server__ebFetch
+
+        if len(query) == 1 and str(query[0]) == "flags":
+            self._oldTimeout = self.setTimeout(None)
+            # no need to call iter, we get a generator
+            maybeDeferred(
+                self.mbox.fetch_flags, messages, uid=uid
+            ).addCallback(
+                cbFetch, tag, query, uid
+            ).addErrback(ebFetch, tag)
+        elif len(query) == 1 and str(query[0]) == "rfc822.header":
+            self._oldTimeout = self.setTimeout(None)
+            # no need to call iter, we get a generator
+            maybeDeferred(
+                self.mbox.fetch_headers, messages, uid=uid
+            ).addCallback(
+                cbFetch, tag, query, uid
+            ).addErrback(ebFetch, tag)
+        else:
+            self._oldTimeout = self.setTimeout(None)
+            # no need to call iter, we get a generator
+            maybeDeferred(
+                self.mbox.fetch, messages, uid=uid
+            ).addCallback(
+                cbFetch, tag, query, uid
+            ).addErrback(
+                ebFetch, tag)
+
+        deferLater(reactor,
+                   2, self.mbox.unset_recent_flags, messages)
+        deferLater(reactor, 1, self.mbox.signal_unread_to_ui)
+
+    select_FETCH = (do_FETCH, imap4.IMAP4Server.arg_seqset,
+                    imap4.IMAP4Server.arg_fetchatt)
+
+    def do_COPY(self, tag, messages, mailbox, uid=0):
+        from twisted.internet import reactor
+        imap4.IMAP4Server.do_COPY(self, tag, messages, mailbox, uid)
+        deferLater(reactor,
+                   2, self.mbox.unset_recent_flags, messages)
+        deferLater(reactor, 1, self.mbox.signal_unread_to_ui)
+
+    select_COPY = (do_COPY, imap4.IMAP4Server.arg_seqset,
+                   imap4.IMAP4Server.arg_astring)
+
+    def notifyNew(self, ignored):
+        """
+        Notify new messages to listeners.
+        """
+        self.mbox.notify_new()
+
+    def _cbSelectWork(self, mbox, cmdName, tag):
+        """
+        Callback for selectWork, patched to avoid conformance errors due to
+        incomplete UIDVALIDITY line.
+        """
+        if mbox is None:
+            self.sendNegativeResponse(tag, 'No such mailbox')
+            return
+        if '\\noselect' in [s.lower() for s in mbox.getFlags()]:
+            self.sendNegativeResponse(tag, 'Mailbox cannot be selected')
+            return
+
+        flags = mbox.getFlags()
+        self.sendUntaggedResponse(str(mbox.getMessageCount()) + ' EXISTS')
+        self.sendUntaggedResponse(str(mbox.getRecentCount()) + ' RECENT')
+        self.sendUntaggedResponse('FLAGS (%s)' % ' '.join(flags))
+
+        # Patched -------------------------------------------------------
+        # imaptest was complaining about the incomplete line, we're adding
+        # "UIDs valid" here.
+        self.sendPositiveResponse(
+            None, '[UIDVALIDITY %d] UIDs valid' % mbox.getUIDValidity())
+        # ----------------------------------------------------------------
+
+        s = mbox.isWriteable() and 'READ-WRITE' or 'READ-ONLY'
+        mbox.addListener(self)
+        self.sendPositiveResponse(tag, '[%s] %s successful' % (s, cmdName))
+        self.state = 'select'
+        self.mbox = mbox
+
+    def checkpoint(self):
+        """
+        Called when the client issues a CHECK command.
+
+        This should perform any checkpoint operations required by the server.
+        It may be a long running operation, but may not block.  If it returns
+        a deferred, the client will only be informed of success (or failure)
+        when the deferred's callback (or errback) is invoked.
+        """
+        # TODO return the output of _memstore.is_writing
+        # XXX and that should return a deferred!
+        return None