Implement configurable repost routing from TG to Mastodon

bridge.py

@@ -1,27 +1,38 @@
+import argparse
 import asyncio
+import logging
 import os
 import uuid
-from io import BytesIO
 
 import toml
-import argparse
 from mastodon import Mastodon
 from telethon import TelegramClient, events
-from telethon.events.common import EventBuilder
+from telethon.tl.functions.channels import JoinChannelRequest
-from telethon.tl.functions.channels import JoinChannelRequest, GetMessagesRequest
 from telethon.tl.functions.contacts import ResolveUsernameRequest
 from telethon.tl.types import InputChannel
+from telethon.utils import get_extension
 
+logging.basicConfig(level=logging.INFO)
 
 class BridgeBot:
     def __init__(self, cfg: dict):
         self.config = cfg
-        self.mastodon_client = Mastodon(
+        self.mastodon_clients = {}
-            client_id=cfg["mastodon"]["client_id"],
+        self.tg_mstdn_mappings = {}
-            client_secret=cfg["mastodon"]["client_secret"],
+        for acc in cfg["mastodon"]["accounts"]:
-            access_token=cfg["mastodon"]["access_token"],
+            mastodon_client = Mastodon(
-            api_base_url=cfg["mastodon"]["api_base_url"]
+                client_id=acc["client_id"],
+                client_secret=acc["client_secret"],
+                access_token=acc["access_token"],
+                api_base_url=acc["api_base_url"]
             )
+            self.mastodon_clients[acc["name"]] = mastodon_client
+
+        for m in cfg["mastodon"]["mappings"]:
+            if self.tg_mstdn_mappings.get("tg_channel_handle", None) is None:
+                self.tg_mstdn_mappings[m["tg_channel_handle"]] = []
+            self.tg_mstdn_mappings[m["tg_channel_handle"]].append(m["account_name"])
+
         self.tg_client = TelegramClient(cfg["telegram"]["session_file"], cfg["telegram"]["api_id"],
                                         cfg["telegram"]["api_hash"])
 
@@ -33,6 +44,7 @@ class BridgeBot:
             channel = InputChannel(result.peer.channel_id, result.chats[0].access_hash)
             await self.tg_client(JoinChannelRequest(channel))
         self.tg_client.add_event_handler(self._tg_event_handler)
+        logging.info("Bot has been started")
         await self.tg_client.run_until_disconnected()
 
     @events.register(events.NewMessage())
@@ -40,19 +52,34 @@ class BridgeBot:
         if event.message.post:
             channel = await event.get_chat()
             if channel.broadcast:
-                if channel.username in self.config["telegram"]["channels"]:
+                if channel.username in self.tg_mstdn_mappings.keys():
-                    print("dobbry vechur")
+                    if event.message.grouped_id is not None:
+                        logging.warning("Albums isn't supported yet")
+                        return
+                    logging.debug("dobbry vechur")
+                    logging.info(f"Catched new post from telegram channel {channel.username}")
                     text: str = event.message.text
                     if event.message.forward:
+                        logging.debug("The current post is forwarded")
                         text = f"[from {event.message.forward.chat.title} (https://t.me/{event.message.forward.chat.username})]\n\n" + text
-                    if event.message.photo:
+                    temp_file_path: str = ""
-                        temp_image_name = uuid.uuid4()
+                    if (event.message.photo or event.message.video or event.message.gif) and not hasattr(event.message.media, "webpage"):
-                        await self.tg_client.download_media(event.message.photo, f"/tmp/{temp_image_name}.jpg")
+                        logging.debug("Post contains the media, downloading it...")
-                        mstdn_media_meta = self.mastodon_client.media_post(f"/tmp/{temp_image_name}.jpg")
+                        temp_file_name = uuid.uuid4()
-                        self.mastodon_client.status_post(text, media_ids=[mstdn_media_meta])
+                        temp_file_path = f"/tmp/{temp_file_name}{get_extension(event.message.media)}"
-                        os.remove(f"/tmp/{temp_image_name}.jpg")
+                        await self.tg_client.download_media(event.message.media, temp_file_path)
+                    for mstdn_acc_name in self.tg_mstdn_mappings[channel.username]:
+                        if self.mastodon_clients.get(mstdn_acc_name, None) is None:
+                            logging.error(f"{mstdn_acc_name} doesn't exists in mastodon.accounts section of config!")
                             return
-                    self.mastodon_client.toot(text)
+                        current_mastodon_client = self.mastodon_clients[mstdn_acc_name]
+                        if temp_file_path != "":
+                            mstdn_media_meta = current_mastodon_client.media_post(temp_file_path)
+                            current_mastodon_client.status_post(text, media_ids=[mstdn_media_meta])
+                        else:
+                            current_mastodon_client.toot(text)
+                    if temp_file_path != "":
+                        os.remove(temp_file_path)
 
 
 if __name__ == '__main__':
@@ -62,6 +89,5 @@ if __name__ == '__main__':
     args = parser.parse_args()
 
     config: dict = toml.loads(open(args.config, "r").read())
-    print(config)
     bot = BridgeBot(config)
     asyncio.get_event_loop().run_until_complete(bot.run())

sample.config.toml

@@ -1,11 +1,26 @@
-[mastodon]
+[[mastodon.mappings]]
-client_id = "abc"
+    account_name = "ChronosX"
-client_secret = "def"
+    tg_channel_handle = "ChronosX_Channel"
-access_token = "ghi"
+
-api_base_url = "mstdn.netwhood.online"
+[[mastodon.mappings]]
+    account_name = "floppy"
+    tg_channel_handle = "netwhood_news"
+
+[[mastodon.accounts]]
+    name = "ChronosX"
+    client_id = "abc"
+    client_secret = "def"
+    access_token = "ghi"
+    api_base_url = "mstdn.netwhood.online"
+
+[[mastodon.accounts]]
+    name = "floppy"
+    client_id = "abc"
+    client_secret = "def"
+    access_token = "ghi"
+    api_base_url = "mstdn.netwhood.online"
 
 [telegram]
-api_id = "123123"
+    api_id = "123123"
-api_hash = "qwerty"
+    api_hash = "qwerty"
-channels = [] # handles of channels without "@"
+    session_file = "/path/to/session/file"
-session_file = "/path/to/session/file"