telegram_bots/bots/modules/channel_helper.py

import base64
import json
import os
import tempfile
from io import BytesIO
from uuid import uuid4

import requests
from PIL import Image
from django.db import models
from telegram import Update, Bot
from telegram.ext import Dispatcher, CallbackContext, MessageHandler, Filters
from jsonrpc import Dispatcher as RPCDispatcher
from djconfig import config

from bots.models import TelegramBotModuleConfig


class ChannelHelperBotModuleConfig(TelegramBotModuleConfig):
    chat_id = models.CharField(max_length=32)
    queued = models.BooleanField(default=False)

    MODULE_NAME = 'Channel helper'

    rpc_dispatcher = None

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.rpc_dispatcher = RPCDispatcher()
        self.rpc_dispatcher['post_photo'] = self.rpc_post_photo

    def rpc_post_photo(self, photo, is_base64=False):
        config._reload_maybe()
        bot = self.bot.get_bot()
        try:
            if is_base64:
                f = BytesIO(base64.b64decode(photo))
            else:
                resp = requests.get(photo)
                resp.raise_for_status()
                f = BytesIO(resp.content)
        except:
            raise RuntimeError('Could not load image')
        im = Image.open(f)  # type: Image.Image
        width, height = im.size
        if width > 2000 or height > 2000:
            im.thumbnail((2000, 2000))
        im = im.convert('RGB')
        with tempfile.TemporaryDirectory() as d:
            fpath = os.path.join(d, '{}.jpg'.format(uuid4()))
            im.save(fpath)
            if self.queued:
                m = bot.send_photo(config.tmp_uploads_chat_id, open(fpath, 'rb'))
                i = QueuedItem(config=self, type='photo', args=json.dumps([m.photo[-1].file_id]))
                i.save()
            else:
                bot.send_photo(self.chat_id, open(fpath, 'rb'))
        return True

    def periodic_task(self, bot: Bot):
        i = self.queued_items.order_by('?').first()  # type: QueuedItem
        if i:
            i.send(bot)
            i.delete()

    def handle_message(self, update: Update, ctx: CallbackContext):
        m = update.effective_message
        bot = ctx.bot
        i = QueuedItem(config=self)
        if hasattr(m, 'audio') and m.audio:
            a = m.audio
            i.type = 'audio'
            i.args = json.dumps([a.file_id, a.duration, a.performer, a.title])
        elif hasattr(m, 'document') and m.document:
            d = m.document
            i.type = 'document'
            i.args = json.dumps([d.file_id, d.file_name])
        elif hasattr(m, 'photo') and m.photo:
            p = m.photo
            i.type = 'photo'
            i.args = json.dumps([p[-1].file_id])
        elif hasattr(m, 'sticker') and m.sticker:
            s = m.sticker
            i.type = 'sticker'
            i.args = json.dumps([s.file_id])
        elif hasattr(m, 'video') and m.video:
            v = m.video
            i.type = 'video'
            i.args = json.dumps([v.file_id, v.duration])
        elif hasattr(m, 'voice') and m.voice:
            v = m.voice
            i.type = 'voice'
            i.args = json.dumps([v.file_id, v.duration])
        elif hasattr(m, 'video_note') and m.video_note:
            vn = m.video_note
            i.type = 'video_note'
            i.args = json.dumps([vn.file_id, vn.duration, vn.length])
        elif hasattr(m, 'contact') and m.contact:
            c = m.contact
            i.type = 'contact'
            i.args = json.dumps([c.phone_number, c.first_name, c.last_name])
        elif hasattr(m, 'location') and m.location:
            l = m.location
            i.type = 'location'
            i.args = json.dumps([l.latitude, l.longitude])
        elif hasattr(m, 'venue') and m.venue:
            v = m.venue
            i.type = 'venue'
            i.args = json.dumps([v.location.latitude, v.location.longitude, v.title, v.address, v.foursquare_id])
        elif hasattr(m, 'text') and m.text:
            i.type = 'message'
            i.args = json.dumps([m.text_html, 'html'])

        if self.queued:
            i.save()
        else:
            i.send(bot)

    def build_dispatcher(self, dispatcher: Dispatcher):
        dispatcher.add_handler(MessageHandler(Filters.private, self.handle_message))
        return dispatcher


class QueuedItem(models.Model):
    config = models.ForeignKey(ChannelHelperBotModuleConfig, on_delete=models.CASCADE, related_name='queued_items')
    type = models.CharField(max_length=12)
    args = models.TextField()

    def send(self, bot: Bot):
        getattr(bot, 'send_' + self.type)(self.config.chat_id, *json.loads(self.args))