приватные каналы

src/domain/post.py

@@ -27,6 +27,15 @@ class Post(TimestampedModel):
 
     @property
     def url(self) -> str | None:
-        if not self.channel.username:
+        if self.channel.username:
+            return f'https://t.me/{self.channel.username}/{self.message_id}'
+
+        telegram_id = self.channel.telegram_id
+        if telegram_id is None:
             return None
-        return f'https://t.me/{self.channel.username}/{self.message_id}'
+
+        channel_id = telegram_id
+        if telegram_id < 0:
+            channel_id = -telegram_id - 1000000000000
+
+        return f'https://t.me/c/{channel_id}/{self.message_id}'