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fix(telegram): exclude forum topic system messages from implicitMention

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When a Telegram Forum topic is created by the bot, Telegram generates a
system message with from.id=botId and empty text.  Every subsequent user
message in that topic has reply_to_message pointing to this system
message, causing the implicitMention check to fire and bypassing
requireMention for every single message.

Add a guard that recognises system messages (is_bot=true with no text)
and excludes them from implicit mention detection, so that only genuine
replies to bot messages trigger the bypass.

Closes #32256

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
scoootscooob
2026-03-02 14:48:49 -08:00
committed by Peter Steinberger
parent bb60687b89
commit 8fdd1d2f05
2 changed files with 105 additions and 1 deletions
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8
src/telegram/bot-message-context.ts
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@@ -471,9 +471,15 @@ export const buildTelegramMessageContext = async ({
return null;
}
// Reply-chain detection: replying to a bot message acts like an implicit mention.
// Exclude forum-topic system messages (auto-generated "Topic created" messages by the
// bot that have empty text) so that every message inside a bot-created topic does not
// incorrectly bypass requireMention (#32256).
const botId = primaryCtx.me?.id;
const replyFromId = msg.reply_to_message?.from?.id;
const implicitMention = botId != null && replyFromId === botId;
const replyToBotMessage = botId != null && replyFromId === botId;
const isReplyToSystemMessage =
replyToBotMessage && msg.reply_to_message?.from?.is_bot === true && !msg.reply_to_message?.text;
const implicitMention = replyToBotMessage && !isReplyToSystemMessage;
const canDetectMention = Boolean(botUsername) || mentionRegexes.length > 0;
const mentionGate = resolveMentionGatingWithBypass({
isGroup,