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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Query and control an archive of messages stored on a server using
XEP-0313: Message Archive Management(MAM).
"""
import random
from datetime import datetime, timedelta, timezone
from hashlib import md5
from typing import Optional, Callable
from slixmpp import JID
from slixmpp.exceptions import IqError, IqTimeout
from poezio.theming import get_theme
from poezio import tabs
from poezio import xhtml, colors
from poezio.config import config
from poezio.text_buffer import TextBuffer
from poezio.ui.types import Message
class DiscoInfoException(Exception): pass
class MAMQueryException(Exception): pass
class NoMAMSupportException(Exception): pass
def add_line(
tab,
text_buffer: TextBuffer,
text: str,
time: datetime,
nick: str,
top: bool,
) -> None:
"""Adds a textual entry in the TextBuffer"""
# Convert to local timezone
time = time.replace(tzinfo=timezone.utc).astimezone(tz=None)
time = time.replace(tzinfo=None)
deterministic = config.get_by_tabname('deterministic_nick_colors', tab.jid.bare)
if isinstance(tab, tabs.MucTab):
nick = nick.split('/')[1]
user = tab.get_user_by_name(nick)
if deterministic:
if user:
color = user.color
else:
theme = get_theme()
if theme.ccg_palette:
fg_color = colors.ccg_text_to_color(theme.ccg_palette, nick)
color = fg_color, -1
else:
mod = len(theme.LIST_COLOR_NICKNAMES)
nick_pos = int(md5(nick.encode('utf-8')).hexdigest(), 16) % mod
color = theme.LIST_COLOR_NICKNAMES[nick_pos]
else:
color = random.choice(list(xhtml.colors))
color = xhtml.colors.get(color)
color = (color, -1)
else:
nick = nick.split('/')[0]
color = get_theme().COLOR_OWN_NICK
text_buffer.add_message(
Message(
txt=text,
time=time,
nickname=nick,
nick_color=color,
history=True,
user=None,
top=top,
)
)
async def query(
core,
groupchat: bool,
remote_jid: JID,
amount: int,
reverse: bool,
start: Optional[datetime] = None,
end: Optional[datetime] = None,
before: Optional[str] = None,
callback: Optional[Callable] = None,
) -> None:
try:
query_jid = remote_jid if groupchat else JID(core.xmpp.boundjid.bare)
iq = await core.xmpp.plugin['xep_0030'].get_info(jid=query_jid)
except (IqError, IqTimeout):
raise DiscoInfoException
if 'urn:xmpp:mam:2' not in iq['disco_info'].get_features():
raise NoMAMSupportException
args = {
'iterator': True,
'reverse': reverse,
}
if groupchat:
args['jid'] = remote_jid
else:
args['with_jid'] = remote_jid
args['rsm'] = {'max': amount}
if reverse:
if before is not None:
args['rsm']['before'] = before
else:
args['end'] = end
else:
args['rsm']['start'] = start
if before is not None:
args['rsm']['end'] = end
try:
results = core.xmpp['xep_0313'].retrieve(**args)
except (IqError, IqTimeout):
raise MAMQueryException
if callback is not None:
callback(results)
return results
async def add_messages_to_buffer(tab, top: bool, results, amount: int) -> bool:
"""Prepends or appends messages to the tab text_buffer"""
text_buffer = tab._text_buffer
msg_count = 0
msgs = []
async for rsm in results:
if top:
for msg in rsm['mam']['results']:
if msg['mam_result']['forwarded']['stanza'] \
.xml.find('{%s}%s' % ('jabber:client', 'body')) is not None:
msgs.append(msg)
if msg_count == amount:
tab.core.refresh_window()
return False
msg_count += 1
msgs.reverse()
for msg in msgs:
forwarded = msg['mam_result']['forwarded']
timestamp = forwarded['delay']['stamp']
message = forwarded['stanza']
tab.last_stanza_id = msg['mam_result']['id']
nick = str(message['from'])
add_line(tab, text_buffer, message['body'], timestamp, nick, top)
else:
for msg in rsm['mam']['results']:
forwarded = msg['mam_result']['forwarded']
timestamp = forwarded['delay']['stamp']
message = forwarded['stanza']
nick = str(message['from'])
add_line(tab, text_buffer, message['body'], timestamp, nick, top)
tab.core.refresh_window()
return False
async def fetch_history(tab, end: Optional[datetime] = None, amount: Optional[int] = None):
remote_jid = tab.jid
before = tab.last_stanza_id
if end is None:
end = datetime.now()
tzone = datetime.now().astimezone().tzinfo
end = end.replace(tzinfo=tzone).astimezone(tz=timezone.utc)
end = end.replace(tzinfo=None)
end = datetime.strftime(end, '%Y-%m-%dT%H:%M:%SZ')
if amount >= 100:
amount = 99
groupchat = isinstance(tab, tabs.MucTab)
results = await query(
tab.core,
groupchat,
remote_jid,
amount,
reverse=True,
end=end,
before=before,
)
query_status = await add_messages_to_buffer(tab, True, results, amount)
tab.query_status = query_status
async def on_tab_open(tab) -> None:
amount = 2 * tab.text_win.height
end = datetime.now()
tab.query_status = True
for message in tab._text_buffer.messages:
time = message.time
if time < end:
end = time
end = end + timedelta(seconds=-1)
try:
await fetch_history(tab, end=end, amount=amount)
except (NoMAMSupportException, MAMQueryException, DiscoInfoException):
tab.query_status = False
return None
async def on_scroll_up(tab) -> None:
tw = tab.text_win
# If position in the tab is < two screen pages, then fetch MAM, so that we
# keep some prefetched margin. A first page should also be prefetched on
# join if not already available.
total, pos, height = len(tw.built_lines), tw.pos, tw.height
rest = (total - pos) // height
# Not resetting the state of query_status here, it is changed only after the
# query is complete (in fetch_history)
# This is done to stop message repetition, eg: if the user presses PageUp continuously.
tab.query_status = True
if rest > 1:
return None
try:
# XXX: Do we want to fetch a possibly variable number of messages?
# (InfoTab changes height depending on the type of messages, see
# `information_buffer_popup_on`).
await fetch_history(tab, amount=height)
except NoMAMSupportException:
tab.core.information('MAM not supported for %r' % tab.jid, 'Info')
return None
except (MAMQueryException, DiscoInfoException):
tab.core.information('An error occured when fetching MAM for %r' % tab.jid, 'Error')
return None
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