Message delete

[Jexly0x]

Hello. I have a simple telegram bot. There is a group to which I write messages, and the bot takes these messages from the channel and copies them into itself. If I delete a message in the channel, the bot does not repeat this in itself. How can I implement it?

[MKRhere]

Bots can't see message deletion. Perhaps as a workaround, you can reply to the message you want to delete with /delete, and have the bot catch the update and delete the replied message and the /delete message. This way the bot knows which message to delete.

Now, propagating it to the other chat is a bit more involved. You'll want to store a mapping of channelMessage -> chatMessage in your database and use that to delete the chatMessage when the bot receives /delete in reply to a channelMessage.

[Jexly0x]

How do I know if a channel has deleted a message? How to tell the bot about it? How to delete in the bot itself? This requires action, which is not.

[MKRhere]

bot.on("channel_post", async ctx => {
	// check if this is channelPost is a text message
	if ("text" in ctx.channelPost) {
		// check if the message is just "/delete"
		if (ctx.channelPost.text.trim() === "/delete") {
			// delete the "/delete" message
			await ctx.deleteMessage();

			// check if it's replying to a channel post
			if (ctx.channelPost.reply_to_message) {
				const channelMsgId = ctx.channelPost.reply_to_message.message_id
				// delete the channel post it's replying to
				await ctx.deleteMessage(channelMsgId);

				const chatMsg = await getLinkedChatMsgFromDBSomehow(channelMsgId);
				// delete the linked chat message
				await ctx.deleteMessage(chatMsg.message_id);
			}

			// nothing more to do here, return out of this function
			return;
		}

		// continue your normal flow
	}
});

Basically don't delete the channel post manually, but reply to the post to delete with "/delete" and the bot will delete it on both sides.

[Jexly0x]

Thank you. I'll check it out soon and give you feedback! Maybe you can also explain with my other topic "reply"?