def apply_aliasing(self, user, mailfrom, rcpttos, msg):
""" Applies an alias as the sender of a message or attempts to infer
it if none was given by the sender.
Handles cases 1d and 1e of the specification.
"""
usralias = None
alias_addx = None
is_alias_address = lambda entry: entry.parse_alias_address()
logging.debug('Attempting to apply aliasing')
# look for use of existing alias in To field (case 1d);
for cur_addx in msg.search_header_addresses('to', is_alias_address):
alias_pair = cur_addx.parse_alias_address()
alias_data = self.db.get_alias_data(*alias_pair, \
uid=user.get_uid())
if not alias_data:
continue
usralias = Alias(**alias_data)
alias_addx = cur_addx
#if not usralias.is_active():
# continue
# remove alias from rcpttos and all To fields
for i in range(len(rcpttos)):
if alias_addx == rcpttos[i]:
del rcpttos[i]
break
msg.replace_address('to', alias_addx, None)
break
# if no alias in To field, try to infer the correct one (case 1e);
if not alias_addx:
logging.debug("Couldn't find alias to use in headers; " \
'attempting to infer correct alias')
alias_data = self.db.infer_alias(user.get_uid(),
msg.get_header_addresses('to'),
user.get_salt())
if not alias_data:
logging.debug('Failed to infer alias')
err = ErrorMessage('applyalias.noinfer',
fromaddx = self.cfg.SVCALIAS,
toaddx = user.get_account_address(),
subject = msg['Subject'])
self.send(err['From'], [user.get_forwarding_address()], err)
return False
usralias = Alias(**alias_data)
#if not usralias.is_active():
# return False
logging.debug('Succesfully inferred alias "%s"', str(usralias))
alias_addx = Address(usralias.get_alias_address())
# if we found an alias to use, apply it, send the
# message, and record in history table;
alias_addx.realname = Address(mailfrom).realname
msg.replace_address('from', None, alias_addx)
#del msg['message-id']
if rcpttos == []:
logging.info('No recipients left; ignoring');
return
rcpt_aliases = []
rcpt_nonaliases = []
for entry in rcpttos:
rcpt_addx = Address(entry)
if rcpt_addx.is_servername():
rcpt_aliases.append(entry)
else:
rcpt_nonaliases.append(entry)
self.send(str(alias_addx), rcpt_nonaliases, msg)
self.forward(str(alias_addx), rcpt_aliases, msg)
self.db.add_history(usralias.get_rid(),
True,
address.getaddresses(rcpttos),
msg['Message-ID'],
user.get_salt())
return
def forward(self, mailfrom, rcpttos, msg):
""" Handles Case 2, where email is not from a service user and so
needs to be forwarded to various aliases.
"""
for rcpt in rcpttos:
prcpt = Address(rcpt)
alias_pair = prcpt.parse_alias_address()
logging.debug(rcpt)
if not alias_pair:
# if the domain is SERVERNAME, sender screwed up; return error to sender...
if prcpt.is_servername():
logging.info('Encountered improperly formatted '
'address "%s" in recipients field', prcpt.address)
# Create error response message
err = ErrorMessage('forward.badformat',
fromaddx = self.cfg.SVCALIAS,
toaddx = mailfrom,
badalias = prcpt.address)
self.send(err['From'], [mailfrom], err)
# ... otherwise ignore; not our job to send to non-users
logging.info('Encountered recipient outside our domain; ignoring')
else:
alias_data = self.db.get_alias_data(*alias_pair)
if alias_data:
fwd_alias = Alias(**alias_data)
userdata = self.db.get_user(uid=fwd_alias.get_uid())
assert userdata is not None
user = User(**userdata)
logging.debug('is trusted? %s', fwd_alias.is_trusted())
# handle trustedness here;
if not fwd_alias.is_trusted():
mfrom = Address(mailfrom)
# if sender is in trusted group, then it's all right;
if self.db.is_trusted_correspondent(mfrom, \
user.get_salt(), \
fwd_alias.get_rid(), \
fwd_alias.get_trusted_timestamp()):
pass # TODO: send/append something about newer alias to send to?
else:
capstat = self.db.get_capstat(mfrom, \
user.get_salt(), \
fwd_alias.get_rid())
logging.debug('capstat=%s', capstat)
if capstat < self.db.CAPTCHA_PENDING:
logging.debug('captcha not yet sent; trying to send one')
# If not approved, send captcha to sender and drop mail.
# TODO: Perhaps we can cache the mail somewhere.
cid = self.db.get_cid(mfrom, user.get_salt())
self.send_captcha(mailfrom, cid, fwd_alias)
#self.db.set_capstat(cid,
# fwd_alias.get_rid(),
# self.db.CAPTCHA_PENDING)
logging.debug('done sending captcha')
elif capstat == self.db.CAPTCHA_PENDING:
logging.debug('captcha was already sent; still waiting for solution')
elif capstat == self.db.CAPTCHA_APPROVED:
logging.debug('captcha approved, but not yet user approved')
# if user denied,
# TODO: just ignore? or do something more?
# pass
# if user judgement pending, send message
# informing them they must wait for user's approval?
if capstat == self.db.USER_PENDING:
pass # TODO: send message
return
# TODO: can consult a whitelist/blacklist/etc. here
fwd_addx = Address(user.get_forwarding_address())
fwd_addx.realname = prcpt.realname
logging.info('Found alias for account (%s) Forwarding message to %s', \
user.get_username(), fwd_addx.address)
# Add hint as recipient name. The hint/domain is used as a reminder
# to the user where this email address was originally created for.
# But since we did not update Reply-To, it will drop off when the
# user replies to the message.
rcptaddr = Address(rcpt)
if rcptaddr.get_realname() == '':
if fwd_alias.get_hint() != None:
rcptaddr.set_realname(fwd_alias.get_hint())
elif fwd_alias.get_domain() != None:
rcptaddr.set_realname(fwd_alias.get_domain())
msg.replace_address('To', rcpt, rcptaddr)
acct_addx = Address(user.get_account_address())
acct_addx.realname = prcpt.realname
#del msg['message-id']
#del msg['DKIM-Signature']
if 'To' in msg:
msg.replace_header('To', msg['To'] + ', ' + str(acct_addx))
if 'Reply-To' in msg:
msg.replace_header('Reply-To', msg['reply-to'] + ', ' + rcpt);
else:
msg.add_header('Reply-To', mailfrom + ', ' + rcpt);
if 'Message-ID' not in msg:
msg.generate_message_id(self.cfg.DOMAIN)
self.send(mailfrom, [str(fwd_addx)], msg)
self.db.add_history(fwd_alias.get_rid(), False, [Address(mailfrom)], msg['Message-ID'], user.get_salt())
else:
logging.info("Couldn't find data for alias (%s,%d)", *alias_pair)
return
