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relay: rework nick normalization with optional unidecode support

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This will attempt to translate UTF-8 nicks to ASCII ones instead of doing the ugly '||||' replace.
Also, the fallback character for disallowed nick characters is now "-" instead of "|".

TODO: document relay::use_unidecode

Closes #561.
This commit is contained in:
James Lu 2019-02-12 00:58:07 -08:00
parent cfbadb4539
commit 11b65ee809
1 changed files with 30 additions and 7 deletions
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37
plugins/relay.py
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@ -12,6 +12,14 @@ from pylinkirc.coremods import permissions
CHANNEL_DELINKED_MSG = "Channel delinked."
RELAY_UNLOADED_MSG = "Relay plugin unloaded."
try:
import unidecode
except ImportError:
log.info('relay: unidecode not found; disabling unicode nicks support')
USE_UNIDECODE = False
else:
USE_UNIDECODE = conf.conf.get('relay', {}).get('use_unidecode', True)
### GLOBAL (statekeeping) VARIABLES
relayusers = defaultdict(dict)
relayservers = defaultdict(dict)
@ -111,8 +119,9 @@ def die(irc=None):
except KeyError:
log.debug('relay.die: failed to clear persistent channels:', exc_info=True)
allowed_chars = string.digits + string.ascii_letters + '/^|\\-_[]{}`'
fallback_separator = '|'
IRC_ASCII_ALLOWED_CHARS = string.digits + string.ascii_letters + '/^|\\-_[]{}`'
FALLBACK_SEPARATOR = '|'
FALLBACK_CHARACTER = '-'
def normalize_nick(irc, netname, nick, times_tagged=0, uid=''):
"""
Creates a normalized nickname for the given nick suitable for introduction to a remote network
@ -121,6 +130,14 @@ def normalize_nick(irc, netname, nick, times_tagged=0, uid=''):
UID is optional for checking regular nick changes, to make sure that the sender doesn't get
marked as nick-colliding with itself.
"""
is_unicode_capable = irc.casemapping in ('utf8', 'utf-8', 'rfc7700')
if USE_UNIDECODE and not is_unicode_capable:
nick = unidecode.unidecode(nick)
netname = unidecode.unidecode(netname)
# Normalize spaces to hyphens
nick = nick.replace(' ', FALLBACK_CHARACTER)
netname = netname.replace(' ', FALLBACK_CHARACTER)
# Get the nick/net separator
separator = irc.serverdata.get('separator') or \
@ -154,8 +171,8 @@ def normalize_nick(irc, netname, nick, times_tagged=0, uid=''):
irc.serverdata.get('relay_force_slashes')
if '/' not in separator or not protocol_allows_slashes:
separator = separator.replace('/', fallback_separator)
nick = nick.replace('/', fallback_separator)
separator = separator.replace('/', FALLBACK_SEPARATOR)
nick = nick.replace('/', FALLBACK_SEPARATOR)
if nick.startswith(tuple(string.digits+'-')):
# On TS6 IRCds, nicks that start with 0-9 are only allowed if
@ -182,9 +199,15 @@ def normalize_nick(irc, netname, nick, times_tagged=0, uid=''):
# Loop over every character in the nick, making sure that it only contains valid
# characters.
for char in nick:
if char not in allowed_chars:
nick = nick.replace(char, fallback_separator)
if not is_unicode_capable:
for char in nick:
if char not in IRC_ASCII_ALLOWED_CHARS:
nick = nick.replace(char, FALLBACK_CHARACTER)
else:
# UnrealIRCd 4's forbidden nick chars, from
# https://github.com/unrealircd/unrealircd/blob/02d69e7d8/src/modules/charsys.c#L152-L163
for char in """!+%@&~#$:'\"?*,.""":
nick = nick.replace(char, FALLBACK_CHARACTER)
while irc.nick_to_uid(nick) not in (None, uid):
# The nick we want exists: Increase the separator length by 1 if the user was already