path: root/src/core/handlers.py

"""
XMPP-related handlers for the Core class
"""

import logging
log = logging.getLogger(__name__)

import asyncio
import curses
import functools
import ssl
import sys
import time
from hashlib import sha1, sha512
from gettext import gettext as _
from os import path

from slixmpp import InvalidJID
from slixmpp.stanza import Message
from slixmpp.xmlstream.stanzabase import StanzaBase, ElementBase
from xml.etree import ElementTree as ET

import bookmark
import common
import fixes
import pep
import tabs
import windows
import xhtml
import multiuserchat as muc
from common import safeJID
from config import config, CACHE_DIR
from contact import Resource
from logger import logger
from roster import roster
from text_buffer import CorrectionError
from theming import dump_tuple, get_theme

from . commands import dumb_callback

try:
    from pygments import highlight
    from pygments.lexers import get_lexer_by_name
    from pygments.formatters import HtmlFormatter
    LEXER = get_lexer_by_name('xml')
    FORMATTER = HtmlFormatter(noclasses=True)
    PYGMENTS = True
except ImportError:
    PYGMENTS = False

def on_session_start_features(self, _):
    """
    Enable carbons & blocking on session start if wanted and possible
    """
    def callback(iq):
        if not iq:
            return
        features = iq['disco_info']['features']
        rostertab = self.get_tab_by_name('Roster', tabs.RosterInfoTab)
        rostertab.check_blocking(features)
        rostertab.check_saslexternal(features)
        if (config.get('enable_carbons') and
                'urn:xmpp:carbons:2' in features):
            self.xmpp.plugin['xep_0280'].enable()
            self.xmpp.add_event_handler('carbon_received', self.on_carbon_received)
            self.xmpp.add_event_handler('carbon_sent', self.on_carbon_sent)

    self.xmpp.plugin['xep_0030'].get_info(jid=self.xmpp.boundjid.domain,
                                          callback=callback)

def on_carbon_received(self, message):
    """
    Carbon <received/> received
    """
    def ignore_message(recv):
        log.debug('%s has category conference, ignoring carbon',
                  recv['from'].server)
    def receive_message(recv):
        recv['to'] = self.xmpp.boundjid.full
        if recv['receipt']:
            return self.on_receipt(recv)
        self.on_normal_message(recv)

    recv = message['carbon_received']
    if (recv['from'].bare not in roster or
        roster[recv['from'].bare].subscription == 'none'):
        fixes.has_identity(self.xmpp, recv['from'].server,
                           identity='conference',
                           on_true=functools.partial(ignore_message, recv),
                           on_false=functools.partial(receive_message, recv))
        return
    else:
        receive_message(recv)

def on_carbon_sent(self, message):
    """
    Carbon <sent/> received
    """
    def ignore_message(sent):
        log.debug('%s has category conference, ignoring carbon',
                  sent['to'].server)
    def send_message(sent):
        sent['from'] = self.xmpp.boundjid.full
        self.on_normal_message(sent)

    sent = message['carbon_sent']
    if (sent['to'].bare not in roster or
            roster[sent['to'].bare].subscription == 'none'):
        fixes.has_identity(self.xmpp, sent['to'].server,
                           identity='conference',
                           on_true=functools.partial(ignore_message, sent),
                           on_false=functools.partial(send_message, sent))
    else:
        send_message(sent)

### Invites ###

def on_groupchat_invitation(self, message):
    """
    Mediated invitation received
    """
    jid = message['from']
    if jid.bare in self.pending_invites:
        return
    # there are 2 'x' tags in the messages, making message['x'] useless
    invite = StanzaBase(self.xmpp, xml=message.find('{http://jabber.org/protocol/muc#user}x/{http://jabber.org/protocol/muc#user}invite'))
    inviter = invite['from']
    reason = invite['reason']
    password = invite['password']
    msg = "You are invited to the room %s by %s" % (jid.full, inviter.full)
    if reason:
        msg += "because: %s" % reason
    if password:
        msg += ". The password is \"%s\"." % password
    self.information(msg, 'Info')
    if 'invite' in config.get('beep_on').split():
        curses.beep()
    logger.log_roster_change(inviter.full, 'invited you to %s' % jid.full)
    self.pending_invites[jid.bare] = inviter.full

def on_groupchat_decline(self, decline):
    "Mediated invitation declined; skip for now"
    pass

def on_groupchat_direct_invitation(self, message):
    """
    Direct invitation received
    """
    room = safeJID(message['groupchat_invite']['jid'])
    if room.bare in self.pending_invites:
        return

    inviter = message['from']
    reason = message['groupchat_invite']['reason']
    password = message['groupchat_invite']['password']
    continue_ = message['groupchat_invite']['continue']
    msg = "You are invited to the room %s by %s" % (room, inviter.full)

    if password:
        msg += ' (password: "%s")' % password
    if continue_:
        msg += '\nto continue the discussion'
    if reason:
        msg += "\nreason: %s" % reason

    self.information(msg, 'Info')
    if 'invite' in config.get('beep_on').split():
        curses.beep()

    self.pending_invites[room.bare] = inviter.full
    logger.log_roster_change(inviter.full, 'invited you to %s' % room.bare)

### "classic" messages ###

def on_message(self, message):
    """
    When receiving private message from a muc OR a normal message
    (from one of our contacts)
    """
    if message.find('{http://jabber.org/protocol/muc#user}x/{http://jabber.org/protocol/muc#user}invite') != None:
        return
    if message['type'] == 'groupchat':
        return
    # Differentiate both type of messages, and call the appropriate handler.
    jid_from = message['from']
    for tab in self.get_tabs(tabs.MucTab):
        if tab.name == jid_from.bare:
            if message['type'] == 'error':
                return self.room_error(message, jid_from)
            else:
                return self.on_groupchat_private_message(message)
    return self.on_normal_message(message)

def on_normal_message(self, message):
    """
    When receiving "normal" messages (not a private message from a
    muc participant)
    """
    if message['type'] == 'error':
        return self.information(self.get_error_message(message, deprecated=True), 'Error')
    elif message['type'] == 'headline' and message['body']:
        return self.information('%s says: %s' % (message['from'], message['body']), 'Headline')

    use_xhtml = config.get('enable_xhtml_im')
    tmp_dir = config.get('tmp_image_dir') or path.join(CACHE_DIR, 'images')
    extract_images = config.get('extract_inline_images')
    body = xhtml.get_body_from_message_stanza(message, use_xhtml=use_xhtml,
                                              tmp_dir=tmp_dir,
                                              extract_images=extract_images)
    if not body:
        return

    remote_nick = ''
    # normal message, we are the recipient
    if message['to'].bare == self.xmpp.boundjid.bare:
        conv_jid = message['from']
        jid = conv_jid
        color = get_theme().COLOR_REMOTE_USER
        # check for a name
        if conv_jid.bare in roster:
            remote_nick = roster[conv_jid.bare].name
        # check for a received nick
        if not remote_nick and config.get('enable_user_nick'):
            if message.xml.find('{http://jabber.org/protocol/nick}nick') is not None:
                remote_nick = message['nick']['nick']
        if not remote_nick:
            remote_nick = conv_jid.user
            if not remote_nick:
                remote_nick = conv_jid.full
        own = False
    # we wrote the message (happens with carbons)
    elif message['from'].bare == self.xmpp.boundjid.bare:
        conv_jid = message['to']
        jid = self.xmpp.boundjid
        color = get_theme().COLOR_OWN_NICK
        remote_nick = self.own_nick
        own = True
    # we are not part of that message, drop it
    else:
        return

    conversation = self.get_conversation_by_jid(conv_jid, create=True)
    if isinstance(conversation, tabs.DynamicConversationTab) and conv_jid.resource:
        conversation.lock(conv_jid.resource)

    if not own and not conversation.nick:
        conversation.nick = remote_nick
    elif not own: # keep a fixed nick during the whole conversation
        remote_nick = conversation.nick

    self.events.trigger('conversation_msg', message, conversation)
    if not message['body']:
        return
    body = xhtml.get_body_from_message_stanza(message, use_xhtml=use_xhtml,
                                              tmp_dir=tmp_dir,
                                              extract_images=extract_images)
    delayed, date = common.find_delayed_tag(message)

    def try_modify():
        replaced_id = message['replace']['id']
        if replaced_id and config.get_by_tabname('group_corrections',
                                                 conv_jid.bare):
            try:
                conversation.modify_message(body, replaced_id, message['id'], jid=jid,
                        nickname=remote_nick)
                return True
            except CorrectionError:
                log.debug('Unable to correct a message', exc_info=True)
        return False

    if not try_modify():
        conversation.add_message(body, date,
                nickname=remote_nick,
                nick_color=color,
                history=delayed,
                identifier=message['id'],
                jid=jid,
                typ=1)

    if conversation.remote_wants_chatstates is None and not delayed:
        if message['chat_state']:
            conversation.remote_wants_chatstates = True
        else:
            conversation.remote_wants_chatstates = False
    if 'private' in config.get('beep_on').split():
        if not config.get_by_tabname('disable_beep', conv_jid.bare):
            curses.beep()
    if self.current_tab() is not conversation:
        conversation.state = 'private'
        self.refresh_tab_win()
    else:
        self.refresh_window()

def on_nick_received(self, message):
    """
    Called when a pep notification for an user nickname
    is received
    """
    contact = roster[message['from'].bare]
    if not contact:
        return
    item = message['pubsub_event']['items']['item']
    if item.xml.find('{http://jabber.org/protocol/nick}nick'):
        contact.name = item['nick']['nick']
    else:
        contact.name = ''

def on_gaming_event(self, message):
    """
    Called when a pep notification for user gaming
    is received
    """
    contact = roster[message['from'].bare]
    if not contact:
        return
    item = message['pubsub_event']['items']['item']
    old_gaming = contact.gaming
    if item.xml.find('{urn:xmpp:gaming:0}gaming'):
        item = item['gaming']
        # only name and server_address are used for now
        contact.gaming = {
                'character_name': item['character_name'],
                'character_profile': item['character_profile'],
                'name': item['name'],
                'level': item['level'],
                'uri': item['uri'],
                'server_name': item['server_name'],
                'server_address': item['server_address'],
            }
    else:
        contact.gaming = {}

    if contact.gaming:
        logger.log_roster_change(contact.bare_jid, 'is playing %s' % (common.format_gaming_string(contact.gaming)))

    if old_gaming != contact.gaming and config.get_by_tabname('display_gaming_notifications', contact.bare_jid):
        if contact.gaming:
            self.information('%s is playing %s' % (contact.bare_jid, common.format_gaming_string(contact.gaming)), 'Gaming')
        else:
            self.information(contact.bare_jid + ' stopped playing.', 'Gaming')

def on_mood_event(self, message):
    """
    Called when a pep notification for an user mood
    is received.
    """
    contact = roster[message['from'].bare]
    if not contact:
        return
    roster.modified()
    item = message['pubsub_event']['items']['item']
    old_mood = contact.mood
    if item.xml.find('{http://jabber.org/protocol/mood}mood'):
        mood = item['mood']['value']
        if mood:
            mood = pep.MOODS.get(mood, mood)
            text = item['mood']['text']
            if text:
                mood = '%s (%s)' % (mood, text)
            contact.mood = mood
        else:
            contact.mood = ''
    else:
        contact.mood = ''

    if contact.mood:
        logger.log_roster_change(contact.bare_jid, 'has now the mood: %s' % contact.mood)

    if old_mood != contact.mood and config.get_by_tabname('display_mood_notifications', contact.bare_jid):
        if contact.mood:
            self.information('Mood from '+ contact.bare_jid + ': ' + contact.mood, 'Mood')
        else:
            self.information(contact.bare_jid + ' stopped having his/her mood.', 'Mood')

def on_activity_event(self, message):
    """
    Called when a pep notification for an user activity
    is received.
    """
    contact = roster[message['from'].bare]
    if not contact:
        return
    roster.modified()
    item = message['pubsub_event']['items']['item']
    old_activity = contact.activity
    if item.xml.find('{http://jabber.org/protocol/activity}activity'):
        try:
            activity = item['activity']['value']
        except ValueError:
            return
        if activity[0]:
            general = pep.ACTIVITIES.get(activity[0])
            s = general['category']
            if activity[1]:
                s = s + '/' + general.get(activity[1], 'other')
            text = item['activity']['text']
            if text:
                s = '%s (%s)' % (s, text)
            contact.activity = s
        else:
            contact.activity = ''
    else:
        contact.activity = ''

    if contact.activity:
        logger.log_roster_change(contact.bare_jid, 'has now the activity %s' % contact.activity)

    if old_activity != contact.activity and config.get_by_tabname('display_activity_notifications', contact.bare_jid):
        if contact.activity:
            self.information('Activity from '+ contact.bare_jid + ': ' + contact.activity, 'Activity')
        else:
            self.information(contact.bare_jid + ' stopped doing his/her activity.', 'Activity')

def on_tune_event(self, message):
    """
    Called when a pep notification for an user tune
    is received
    """
    contact = roster[message['from'].bare]
    if not contact:
        return
    roster.modified()
    item = message['pubsub_event']['items']['item']
    old_tune = contact.tune
    if item.xml.find('{http://jabber.org/protocol/tune}tune'):
        item = item['tune']
        contact.tune = {
                'artist': item['artist'],
                'length': item['length'],
                'rating': item['rating'],
                'source': item['source'],
                'title': item['title'],
                'track': item['track'],
                'uri': item['uri']
            }
    else:
        contact.tune = {}

    if contact.tune:
        logger.log_roster_change(message['from'].bare, 'is now listening to %s' % common.format_tune_string(contact.tune))

    if old_tune != contact.tune and config.get_by_tabname('display_tune_notifications', contact.bare_jid):
        if contact.tune:
            self.information(
                    'Tune from '+ message['from'].bare + ': ' + common.format_tune_string(contact.tune),
                    'Tune')
        else:
            self.information(contact.bare_jid + ' stopped listening to music.', 'Tune')

def on_groupchat_message(self, message):
    """
    Triggered whenever a message is received from a multi-user chat room.
    """
    if message['subject']:
        return
    room_from = message['from'].bare

    if message['type'] == 'error': # Check if it's an error
        return self.room_error(message, room_from)

    tab = self.get_tab_by_name(room_from, tabs.MucTab)
    if not tab:
        self.information(_("message received for a non-existing room: %s") % (room_from))
        muc.leave_groupchat(self.xmpp, room_from, self.own_nick, msg='')
        return

    nick_from = message['mucnick']
    user = tab.get_user_by_name(nick_from)
    if user and user in tab.ignores:
        return

    self.events.trigger('muc_msg', message, tab)
    use_xhtml = config.get('enable_xhtml_im')
    tmp_dir = config.get('tmp_image_dir') or path.join(CACHE_DIR, 'images')
    extract_images = config.get('extract_inline_images')
    body = xhtml.get_body_from_message_stanza(message, use_xhtml=use_xhtml,
                                              tmp_dir=tmp_dir,
                                              extract_images=extract_images)
    if not body:
        return

    old_state = tab.state
    delayed, date = common.find_delayed_tag(message)
    replaced_id = message['replace']['id']
    replaced = False
    if replaced_id is not '' and config.get_by_tabname('group_corrections',
                                                       message['from'].bare):
        try:
            if tab.modify_message(body, replaced_id, message['id'], time=date,
                    nickname=nick_from, user=user):
                self.events.trigger('highlight', message, tab)
            replaced = True
        except CorrectionError:
            log.debug('Unable to correct a message', exc_info=True)
    if not replaced and tab.add_message(body, date, nick_from, history=delayed, identifier=message['id'], jid=message['from'], typ=1):
        self.events.trigger('highlight', message, tab)

    if message['from'].resource == tab.own_nick:
        tab.last_sent_message = message

    if tab is self.current_tab():
        tab.text_win.refresh()
        tab.info_header.refresh(tab, tab.text_win)
        tab.input.refresh()
        self.doupdate()
    elif tab.state != old_state:
        self.refresh_tab_win()
        current = self.current_tab()
        if hasattr(current, 'input') and current.input:
            current.input.refresh()
        self.doupdate()

    if 'message' in config.get('beep_on').split():
        if (not config.get_by_tabname('disable_beep', room_from)
                and self.own_nick != message['from'].resource):
            curses.beep()

def on_muc_own_nickchange(self, muc):
    "We changed our nick in a MUC"
    for tab in self.get_tabs(tabs.PrivateTab):
        if tab.parent_muc == muc:
            tab.own_nick = muc.own_nick

def on_groupchat_private_message(self, message):
    """
    We received a Private Message (from someone in a Muc)
    """
    jid = message['from']
    nick_from = jid.resource
    if not nick_from:
        return self.on_groupchat_message(message)

    room_from = jid.bare
    use_xhtml = config.get('enable_xhtml_im')
    tmp_dir = config.get('tmp_image_dir') or path.join(CACHE_DIR, 'images')
    extract_images = config.get('extract_inline_images')
    body = xhtml.get_body_from_message_stanza(message, use_xhtml=use_xhtml,
                                              tmp_dir=tmp_dir,
                                              extract_images=extract_images)
    tab = self.get_tab_by_name(jid.full, tabs.PrivateTab) # get the tab with the private conversation
    ignore = config.get_by_tabname('ignore_private', room_from)
    if not tab: # It's the first message we receive: create the tab
        if body and not ignore:
            tab = self.open_private_window(room_from, nick_from, False)
    if ignore:
        self.events.trigger('ignored_private', message, tab)
        msg = config.get_by_tabname('private_auto_response', room_from)
        if msg and body:
            self.xmpp.send_message(mto=jid.full, mbody=msg, mtype='chat')
        return
    self.events.trigger('private_msg', message, tab)
    body = xhtml.get_body_from_message_stanza(message, use_xhtml=use_xhtml,
                                              tmp_dir=tmp_dir,
                                              extract_images=extract_images)
    if not body or not tab:
        return
    replaced_id = message['replace']['id']
    replaced = False
    user = tab.parent_muc.get_user_by_name(nick_from)
    if replaced_id is not '' and config.get_by_tabname('group_corrections',
                                                       room_from):
        try:
            tab.modify_message(body, replaced_id, message['id'], user=user, jid=message['from'],
                    nickname=nick_from)
            replaced = True
        except CorrectionError:
            log.debug('Unable to correct a message', exc_info=True)
    if not replaced:
        tab.add_message(body, time=None, nickname=nick_from,
                        forced_user=user,
                        identifier=message['id'],
                        jid=message['from'],
                        typ=1)

    if tab.remote_wants_chatstates is None:
        if message['chat_state']:
            tab.remote_wants_chatstates = True
        else:
            tab.remote_wants_chatstates = False
    if 'private' in config.get('beep_on').split():
        if not config.get_by_tabname('disable_beep', jid.full):
            curses.beep()
    if tab is self.current_tab():
        self.refresh_window()
    else:
        tab.state = 'private'
        self.refresh_tab_win()

### Chatstates ###

def on_chatstate_active(self, message):
    self.on_chatstate(message, "active")

def on_chatstate_inactive(self, message):
    self.on_chatstate(message, "inactive")

def on_chatstate_composing(self, message):
    self.on_chatstate(message, "composing")

def on_chatstate_paused(self, message):
    self.on_chatstate(message, "paused")

def on_chatstate_gone(self, message):
    self.on_chatstate(message, "gone")

def on_chatstate(self, message, state):
    if message['type'] == 'chat':
        if not self.on_chatstate_normal_conversation(message, state):
            tab = self.get_tab_by_name(message['from'].full, tabs.PrivateTab)
            if not tab:
                return
            self.on_chatstate_private_conversation(message, state)
    elif message['type'] == 'groupchat':
        self.on_chatstate_groupchat_conversation(message, state)

def on_chatstate_normal_conversation(self, message, state):
    tab = self.get_conversation_by_jid(message['from'], False)
    if not tab:
        return False
    tab.remote_wants_chatstates = True
    self.events.trigger('normal_chatstate', message, tab)
    tab.chatstate = state
    if state == 'gone' and isinstance(tab, tabs.DynamicConversationTab):
        tab.unlock()
    if tab == self.current_tab():
        tab.refresh_info_header()
        self.doupdate()
    else:
        _composing_tab_state(tab, state)
        self.refresh_tab_win()
    return True

def on_chatstate_private_conversation(self, message, state):
    """
    Chatstate received in a private conversation from a MUC
    """
    tab = self.get_tab_by_name(message['from'].full, tabs.PrivateTab)
    if not tab:
        return
    tab.remote_wants_chatstates = True
    self.events.trigger('private_chatstate', message, tab)
    tab.chatstate = state
    if tab == self.current_tab():
        tab.refresh_info_header()
        self.doupdate()
    else:
        _composing_tab_state(tab, state)
        self.refresh_tab_win()
    return True

def on_chatstate_groupchat_conversation(self, message, state):
    """
    Chatstate received in a MUC
    """
    nick = message['mucnick']
    room_from = message.get_mucroom()
    tab = self.get_tab_by_name(room_from, tabs.MucTab)
    if tab and tab.get_user_by_name(nick):
        self.events.trigger('muc_chatstate', message, tab)
        tab.get_user_by_name(nick).chatstate = state
    if tab == self.current_tab():
        if not self.size.tab_degrade_x:
            tab.user_win.refresh(tab.users)
        tab.input.refresh()
        self.doupdate()
    else:
        _composing_tab_state(tab, state)
        self.refresh_tab_win()

### subscription-related handlers ###

def on_roster_update(self, iq):
    """
    The roster was received.
    """
    for item in iq['roster']:
        try:
            jid = item['jid']
        except InvalidJID:
            jid = item._get_attr('jid', '')
            log.error('Invalid JID: "%s"', jid, exc_info=True)
        else:
            if item['subscription'] == 'remove':
                del roster[jid]
            else:
                roster.update_contact_groups(jid)
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_subscription_request(self, presence):
    """subscribe received"""
    jid = presence['from'].bare
    contact = roster[jid]
    if contact and contact.subscription in ('from', 'both'):
        return
    elif contact and contact.subscription == 'to':
        self.xmpp.sendPresence(pto=jid, ptype='subscribed')
        self.xmpp.sendPresence(pto=jid)
    else:
        if not contact:
            contact = roster.get_and_set(jid)
        roster.update_contact_groups(contact)
        contact.pending_in = True
        self.information('%s wants to subscribe to your presence' % jid, 'Roster')
        self.get_tab_by_number(0).state = 'highlight'
        roster.modified()
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_subscription_authorized(self, presence):
    """subscribed received"""
    jid = presence['from'].bare
    contact = roster[jid]
    if contact.subscription not in ('both', 'from'):
        self.information('%s accepted your contact proposal' % jid, 'Roster')
    if contact.pending_out:
        contact.pending_out = False

    roster.modified()

    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_subscription_remove(self, presence):
    """unsubscribe received"""
    jid = presence['from'].bare
    contact = roster[jid]
    if not contact:
        return
    roster.modified()
    self.information('%s does not want to receive your status anymore.' % jid, 'Roster')
    self.get_tab_by_number(0).state = 'highlight'
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_subscription_removed(self, presence):
    """unsubscribed received"""
    jid = presence['from'].bare
    contact = roster[jid]
    if not contact:
        return
    roster.modified()
    if contact.pending_out:
        self.information('%s rejected your contact proposal' % jid, 'Roster')
        contact.pending_out = False
    else:
        self.information('%s does not want you to receive his/her/its status anymore.'%jid, 'Roster')
    self.get_tab_by_number(0).state = 'highlight'
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

### Presence-related handlers ###

def on_presence(self, presence):
    if presence.match('presence/muc') or presence.xml.find('{http://jabber.org/protocol/muc#user}x'):
        return
    jid = presence['from']
    contact = roster[jid.bare]
    tab = self.get_conversation_by_jid(jid, create=False)
    if isinstance(tab, tabs.DynamicConversationTab):
        if tab.get_dest_jid() != jid.full:
            tab.unlock(from_=jid.full)
        elif presence['type'] == 'unavailable':
            tab.unlock()
    if contact is None:
        return
    roster.modified()
    contact.error = None
    self.events.trigger('normal_presence', presence, contact[jid.full])
    tab = self.get_conversation_by_jid(jid, create=False)
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()
    elif self.current_tab() == tab:
        tab.refresh()
        self.doupdate()

def on_presence_error(self, presence):
    jid = presence['from']
    contact = roster[jid.bare]
    if not contact:
        return
    roster.modified()
    contact.error = presence['error']['type'] + ': ' + presence['error']['condition']
    # reset chat states status on presence error
    tab = self.get_tab_by_name(jid.full, tabs.ConversationTab)
    if tab:
        tab.remote_wants_chatstates = None

def on_got_offline(self, presence):
    """
    A JID got offline
    """
    if presence.match('presence/muc') or presence.xml.find('{http://jabber.org/protocol/muc#user}x'):
        return
    jid = presence['from']
    if not logger.log_roster_change(jid.bare, 'got offline'):
        self.information(_('Unable to write in the log file'), 'Error')
    # If a resource got offline, display the message in the conversation with this
    # precise resource.
    if jid.resource:
        self.add_information_message_to_conversation_tab(jid.full, '\x195}%s is \x191}offline' % (jid.full))
    self.add_information_message_to_conversation_tab(jid.bare, '\x195}%s is \x191}offline' % (jid.bare))
    self.information('\x193}%s \x195}is \x191}offline' % (jid.bare), 'Roster')
    roster.modified()
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_got_online(self, presence):
    """
    A JID got online
    """
    if presence.match('presence/muc') or presence.xml.find('{http://jabber.org/protocol/muc#user}x'):
        return
    jid = presence['from']
    contact = roster[jid.bare]
    if contact is None:
        # Todo, handle presence coming from contacts not in roster
        return
    roster.modified()
    if not logger.log_roster_change(jid.bare, 'got online'):
        self.information(_('Unable to write in the log file'), 'Error')
    resource = Resource(jid.full, {
        'priority': presence.get_priority() or 0,
        'status': presence['status'],
        'show': presence['show'],
        })
    self.events.trigger('normal_presence', presence, resource)
    self.add_information_message_to_conversation_tab(jid.full, '\x195}%s is \x194}online' % (jid.full))
    if time.time() - self.connection_time > 10:
        # We do not display messages if we recently logged in
        if presence['status']:
            self.information("\x193}%s \x195}is \x194}online\x195} (\x19o%s\x195})" % (safeJID(resource.jid).bare, presence['status']), "Roster")
        else:
            self.information("\x193}%s \x195}is \x194}online\x195}" % safeJID(resource.jid).bare, "Roster")
        self.add_information_message_to_conversation_tab(jid.bare, '\x195}%s is \x194}online' % (jid.bare))
    if isinstance(self.current_tab(), tabs.RosterInfoTab):
        self.refresh_window()

def on_groupchat_presence(self, presence):
    """
    Triggered whenever a presence stanza is received from a user in a multi-user chat room.
    Display the presence on the room window and update the
    presence information of the concerned user
    """
    from_room = presence['from'].bare
    tab = self.get_tab_by_name(from_room, tabs.MucTab)
    if tab:
        self.events.trigger('muc_presence', presence, tab)
        tab.handle_presence(presence)


### Connection-related handlers ###

def on_failed_connection(self, error):
    """
    We cannot contact the remote server
    """
    self.information(_("Connection to remote server failed: %s" % (error,)), _('Error'))

def on_disconnected(self, event):
    """
    When we are disconnected from remote server
    """
    # Stop the ping plugin. It would try to send stanza on regular basis
    self.xmpp.plugin['xep_0199'].disable_keepalive()
    roster.modified()
    for tab in self.get_tabs(tabs.MucTab):
        tab.disconnect()
    self.information(_("Disconnected from server."), _('Error'))
    if not self.legitimate_disconnect and config.get('auto_reconnect', True):
        self.information(_("Auto-reconnecting."), _('Info'))
        self.xmpp.connect()

def on_stream_error(self, event):
    """
    When we receive a stream error
    """
    if event and event['text']:
        self.information(_('Stream error: %s') % event['text'], _('Error'))

def on_failed_all_auth(self, event):
    """
    Authentication failed
    """
    self.information(_("Authentication failed (bad credentials?)."),
                     _('Error'))
    self.legitimate_disconnect = True

def on_no_auth(self, event):
    """
    Authentication failed (no mech)
    """
    self.information(_("Authentication failed, no login method available."),
                     _('Error'))
    self.legitimate_disconnect = True

def on_connected(self, event):
    """
    Remote host responded, but we are not yet authenticated
    """
    self.information(_("Connected to server."), 'Info')

def on_connecting(self, event):
    """
    Just before we try to connect to the server
    """
    self.legitimate_disconnect = False

def on_session_start(self, event):
    """
    Called when we are connected and authenticated
    """
    self.connection_time = time.time()
    if not self.plugins_autoloaded: # Do not reload plugins on reconnection
        self.autoload_plugins()
    self.information(_("Authentication success."), 'Info')
    self.information(_("Your JID is %s") % self.xmpp.boundjid.full, 'Info')
    if not self.xmpp.anon:
        # request the roster
        self.xmpp.get_roster()
        roster.update_contact_groups(self.xmpp.boundjid.bare)
        # send initial presence
        if config.get('send_initial_presence'):
            pres = self.xmpp.make_presence()
            pres['show'] = self.status.show
            pres['status'] = self.status.message
            self.events.trigger('send_normal_presence', pres)
            pres.send()
    bookmark.get_local()
    def _join_initial_rooms(bookmarks):
        """Join all rooms given in the iterator `bookmarks`"""
        for bm in bookmarks:
            if bm.autojoin or config.get('open_all_bookmarks'):
                tab = self.get_tab_by_name(bm.jid, tabs.MucTab)
                nick = bm.nick if bm.nick else self.own_nick
                if not tab:
                    self.open_new_room(bm.jid, nick, False)
                self.initial_joins.append(bm.jid)
                histo_length = config.get('muc_history_length')
                if histo_length == -1:
                    histo_length = None
                if histo_length is not None:
                    histo_length = str(histo_length)
                # do not join rooms that do not have autojoin
                # but display them anyway
                if bm.autojoin:
                    muc.join_groupchat(self, bm.jid, nick,
                            passwd=bm.password,
                            maxhistory=histo_length,
                            status=self.status.message,
                            show=self.status.show)
    def _join_remote_only():
        remote_bookmarks = (bm for bm in bookmark.bookmarks if (bm.method in ("pep", "privatexml")))
        _join_initial_rooms(remote_bookmarks)
    if not self.xmpp.anon and config.get('use_remote_bookmarks'):
        bookmark.get_remote(self.xmpp, _join_remote_only)
    # join all the available bookmarks. As of yet, this is just the local
    # ones
    _join_initial_rooms(bookmark.bookmarks)

    if config.get('enable_user_nick'):
        self.xmpp.plugin['xep_0172'].publish_nick(nick=self.own_nick, callback=dumb_callback)
    self.xmpp.plugin['xep_0115'].update_caps()
    # Start the ping's plugin regular event
    self.xmpp.set_keepalive_values()

### Other handlers ###

def on_status_codes(self, message):
    """
    Handle groupchat messages with status codes.
    Those are received when a room configuration change occurs.
    """
    room_from = message['from']
    tab = self.get_tab_by_name(room_from, tabs.MucTab)
    status_codes = set([s.attrib['code'] for s in message.findall('{%s}x/{%s}status' % (tabs.NS_MUC_USER, tabs.NS_MUC_USER))])
    if '101' in status_codes:
        self.information('Your affiliation in the room %s changed' % room_from, 'Info')
    elif tab and status_codes:
        show_unavailable = '102' in status_codes
        hide_unavailable = '103' in status_codes
        non_priv = '104' in status_codes
        logging_on = '170' in status_codes
        logging_off = '171' in status_codes
        non_anon = '172' in status_codes
        semi_anon = '173' in status_codes
        full_anon = '174' in status_codes
        modif = False
        if show_unavailable or hide_unavailable or non_priv or logging_off\
                or non_anon or semi_anon or full_anon:
            tab.add_message('\x19%(info_col)s}Info: A configuration change not privacy-related occured.' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
            modif = True
        if show_unavailable:
            tab.add_message('\x19%(info_col)s}Info: The unavailable members are now shown.' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        elif hide_unavailable:
            tab.add_message('\x19%(info_col)s}Info: The unavailable members are now hidden.' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        if non_anon:
            tab.add_message('\x191}Warning:\x19%(info_col)s} The room is now not anonymous. (public JID)' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        elif semi_anon:
            tab.add_message('\x19%(info_col)s}Info: The room is now semi-anonymous. (moderators-only JID)' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        elif full_anon:
            tab.add_message('\x19%(info_col)s}Info: The room is now fully anonymous.' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        if logging_on:
            tab.add_message('\x191}Warning: \x19%(info_col)s}This room is publicly logged' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        elif logging_off:
            tab.add_message('\x19%(info_col)s}Info: This room is not logged anymore.' %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    typ=2)
        if modif:
            self.refresh_window()

def on_groupchat_subject(self, message):
    """
    Triggered when the topic is changed.
    """
    nick_from = message['mucnick']
    room_from = message.get_mucroom()
    tab = self.get_tab_by_name(room_from, tabs.MucTab)
    subject = message['subject']
    if subject is None or not tab:
        return
    if subject != tab.topic:
        # Do not display the message if the subject did not change or if we
        # receive an empty topic when joining the room.
        if nick_from:
            tab.add_message(_("\x19%(info_col)s}%(nick)s set the subject to: %(subject)s") %
                    {'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT), 'nick':nick_from, 'subject':subject},
                    time=None,
                    typ=2)
        else:
            tab.add_message(_("\x19%(info_col)s}The subject is: %(subject)s") %
                    {'subject':subject, 'info_col': dump_tuple(get_theme().COLOR_INFORMATION_TEXT)},
                    time=None,
                    typ=2)
    tab.topic = subject
    tab.topic_from = nick_from
    if self.get_tab_by_name(room_from, tabs.MucTab) is self.current_tab():
        self.refresh_window()

def on_receipt(self, message):
    """
    When a delivery receipt is received (XEP-0184)
    """
    jid = message['from']
    msg_id = message['receipt']
    if not msg_id:
        return

    conversation = self.get_tab_by_name(jid, tabs.ChatTab)
    conversation = conversation or self.get_tab_by_name(jid.bare, tabs.ChatTab)
    if not conversation:
        return

    conversation.ack_message(msg_id)

def on_data_form(self, message):
    """
    When a data form is received
    """
    self.information('%s' % message)

def on_attention(self, message):
    """
    Attention probe received.
    """
    jid_from = message['from']
    self.information('%s requests your attention!' % jid_from, 'Info')
    for tab in self.tabs:
        if tab.name == jid_from:
            tab.state = 'attention'
            self.refresh_tab_win()
            return
    for tab in self.tabs:
        if tab.name == jid_from.bare:
            tab.state = 'attention'
            self.refresh_tab_win()
            return
    self.information('%s tab not found.' % jid_from, 'Error')

def room_error(self, error, room_name):
    """
    Display the error in the tab
    """
    tab = self.get_tab_by_name(room_name, tabs.MucTab)
    error_message = self.get_error_message(error)
    tab.add_message(error_message, highlight=True, nickname='Error',
                    nick_color=get_theme().COLOR_ERROR_MSG, typ=2)
    code = error['error']['code']
    if code == '401':
        msg = _('To provide a password in order to join the room, type "/join / password" (replace "password" by the real password)')
        tab.add_message(msg, typ=2)
    if code == '409':
        if config.get('alternative_nickname') != '':
            self.command_join('%s/%s'% (tab.name, tab.own_nick+config.get('alternative_nickname')))
        else:
            if not tab.joined:
                tab.add_message(_('You can join the room with an other nick, by typing "/join /other_nick"'), typ=2)
    self.refresh_window()

def outgoing_stanza(self, stanza):
    """
    We are sending a new stanza, write it in the xml buffer if needed.
    """
    if self.xml_tab:
        if PYGMENTS:
            xhtml_text = highlight('%s' % stanza, LEXER, FORMATTER)
            poezio_colored = xhtml.xhtml_to_poezio_colors(xhtml_text, force=True).rstrip('\x19o').strip()
        else:
            poezio_colored = '%s' % stanza
        self.add_message_to_text_buffer(self.xml_buffer, poezio_colored,
                                        nickname=get_theme().CHAR_XML_OUT)
        try:
            if self.xml_tab.match_stanza(ElementBase(ET.fromstring(stanza))):
                self.add_message_to_text_buffer(self.xml_tab.filtered_buffer, poezio_colored,
                                                nickname=get_theme().CHAR_XML_OUT)
        except:
            log.debug('', exc_info=True)

        if isinstance(self.current_tab(), tabs.XMLTab):
            self.current_tab().refresh()
            self.doupdate()

def incoming_stanza(self, stanza):
    """
    We are receiving a new stanza, write it in the xml buffer if needed.
    """
    if self.xml_tab:
        if PYGMENTS:
            xhtml_text = highlight('%s' % stanza, LEXER, FORMATTER)
            poezio_colored = xhtml.xhtml_to_poezio_colors(xhtml_text, force=True).rstrip('\x19o').strip()
        else:
            poezio_colored = '%s' % stanza
        self.add_message_to_text_buffer(self.xml_buffer, poezio_colored,
                                        nickname=get_theme().CHAR_XML_IN)
        try:
            if self.xml_tab.match_stanza(stanza):
                self.add_message_to_text_buffer(self.xml_tab.filtered_buffer, poezio_colored,
                                                nickname=get_theme().CHAR_XML_IN)
        except:
            log.debug('', exc_info=True)
        if isinstance(self.current_tab(), tabs.XMLTab):
            self.current_tab().refresh()
            self.doupdate()

def validate_ssl(self, pem):
    """
    Check the server certificate using the slixmpp ssl_cert event
    """
    if config.get('ignore_certificate'):
        return
    cert = config.get('certificate')
    # update the cert representation when it uses the old one
    if cert and not ':' in cert:
        cert = ':'.join(i + j for i, j in zip(cert[::2], cert[1::2])).upper()
        config.set_and_save('certificate', cert)

    der = ssl.PEM_cert_to_DER_cert(pem)
    sha1_digest = sha1(der).hexdigest().upper()
    sha1_found_cert = ':'.join(i + j for i, j in zip(sha1_digest[::2], sha1_digest[1::2]))
    sha2_digest = sha512(der).hexdigest().upper()
    sha2_found_cert = ':'.join(i + j for i, j in zip(sha2_digest[::2], sha2_digest[1::2]))
    if cert:
        if sha1_found_cert == cert:
            log.debug('Cert %s OK', sha1_found_cert)
            log.debug('Current hash is SHA-1, moving to SHA-2 (%s)',
                      sha2_found_cert)
            config.set_and_save('certificate', sha2_found_cert)
            return
        elif sha2_found_cert == cert:
            log.debug('Cert %s OK', sha2_found_cert)
            return
        else:
            saved_input = self.current_tab().input
            log.debug('\nWARNING: CERTIFICATE CHANGED old: %s, new: %s\n', cert, sha2_found_cert)
            self.information('New certificate found (sha-2 hash:'
                             ' %s)\nPlease validate or abort' % sha2_found_cert,
                             'Warning')
            input = windows.YesNoInput(text="WARNING! Server certificate has changed, accept? (y/n)")
            self.current_tab().input = input
            input.resize(1, self.current_tab().width, self.current_tab().height-1, 0)
            input.refresh()
            self.doupdate()
            old_loop = asyncio.get_event_loop()
            new_loop = asyncio.new_event_loop()
            asyncio.set_event_loop(new_loop)
            new_loop.add_reader(sys.stdin, self.on_input_readable)
            future = asyncio.Future()
            @asyncio.coroutine
            def check_input(future):
                while input.value is None:
                    yield from asyncio.sleep(0.01)
                self.current_tab().input = saved_input
                self.paused = False
                if input.value:
                    self.information('Setting new certificate: old: %s, new: %s' % (cert, sha2_found_cert), 'Info')
                    log.debug('Setting certificate to %s', sha2_found_cert)
                    if not config.silent_set('certificate', sha2_found_cert):
                        self.information(_('Unable to write in the config file'), 'Error')
                else:
                    self.information('You refused to validate the certificate. You are now disconnected', 'Info')
                    self.xmpp.disconnect()
                new_loop.stop()
                asyncio.set_event_loop(old_loop)
            asyncio.async(check_input(future))
            new_loop.run_forever()


    else:
        log.debug('First time. Setting certificate to %s', sha2_found_cert)
        if not config.silent_set('certificate', sha2_found_cert):
            self.information(_('Unable to write in the config file'), 'Error')

def _composing_tab_state(tab, state):
    """
    Set a tab state to or from the "composing" state
    according to the config and the current tab state
    """
    if isinstance(tab, tabs.MucTab):
        values = ('true', 'muc')
    elif isinstance(tab, tabs.PrivateTab):
        values = ('true', 'direct', 'private')
    elif isinstance(tab, tabs.ConversationTab):
        values = ('true', 'direct', 'conversation')
    else:
        return # should not happen

    show = config.get('show_composing_tabs')
    show = show in values

    if tab.state != 'composing' and state == 'composing':
        if show:
            if tabs.STATE_PRIORITY[tab.state] > tabs.STATE_PRIORITY[state]:
                return
            tab.save_state()
            tab.state = 'composing'
    elif tab.state == 'composing' and state != 'composing':
        tab.restore_state()

### Ad-hoc commands

def on_next_adhoc_step(self, iq, adhoc_session):
    status = iq['command']['status']
    xform = iq.xml.find('{http://jabber.org/protocol/commands}command/{jabber:x:data}x')
    if xform is not None:
        form = self.xmpp.plugin['xep_0004'].buildForm(xform)
    else:
        form = None

    if status == 'error':
        return self.information("An error occured while executing the command")

    if status == 'executing':
        if not form:
            self.information("Adhoc command step does not contain a data-form. Aborting the execution.", "Error")
            return self.xmpp.plugin['xep_0050'].cancel_command(adhoc_session)
        on_validate = self.validate_adhoc_step
        on_cancel = self.cancel_adhoc_command
    if status == 'completed':
        on_validate = lambda form, session: self.close_tab()
        on_cancel = lambda form, session: self.close_tab()

    # If a form is available, use it, and add the Notes from the
    # response to it, if any
    if form:
        for note in iq['command']['notes']:
            form.add_field(type='fixed', label=note[1])
        self.open_new_form(form, on_cancel, on_validate,
                           session=adhoc_session)
    else:                   # otherwise, just display an information
                            # message
        notes = '\n'.join([note[1] for note in iq['command']['notes']])
        self.information("Adhoc command %s: %s" % (status, notes), "Info")

def on_adhoc_error(self, iq, adhoc_session):
    self.xmpp.plugin['xep_0050'].terminate_command(adhoc_session)
    error_message = self.get_error_message(iq)
    self.information("An error occured while executing the command: %s" % (error_message),
                     'Error')

def cancel_adhoc_command(self, form, session):
    self.xmpp.plugin['xep_0050'].cancel_command(session)
    self.close_tab()

def validate_adhoc_step(self, form, session):
    session['payload'] = form
    self.xmpp.plugin['xep_0050'].continue_command(session)
    self.close_tab()

def terminate_adhoc_command(self, form, session):
    self.xmpp.plugin['xep_0050'].terminate_command(session)
    self.close_tab()