first version

.gitignore

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+*.mbp

LICENSE

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+Lain Iwakura <lain@serialexperiments.club> 2019 ~ 2025
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the “Software”),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+1. The above Name and Email shall be included in all copies or
+   substantial portions of the Software. Additionally, this license
+   file shall be included with the software files on top directory
+   with no changes on the file name or its contents.
+
+2. In the case of selling copies of this software, you must direct a
+   portion of the income obtained to my address in the form of sweets,
+   cookies and milk. These may be replaced by technological gadgets, such as
+   full-sized robots, AI-controlled devices, tiny portable synthesizers,
+   and/or at your discretion sex devices remotely controlled via the internet.
+
+3. In case you are making a lot of money with my software, you should send
+   a monthly email to the address at the top of this file with the subject
+   "I will feel only love" and in the content "I love you Lain". You are
+   also allowed to write whatever you want after this sentence.
+
+3. You acknowledge that this software is not designed, licensed or
+   intended for use in the design, construction, operation or
+   maintenance of any nuclear facility.
+

README.md

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+# Thread Only
+A [maubot](https://github.com/maubot/maubot) that redacts text messages that isn't in a thread.
+
+Invite it to your room, give it moderator permission (or whatever is necessary to redact
+messages), and it will delete text messages that isn't in a thread as they're sent.

maubot.yaml

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+id: club.serialexperiments.threadonly
+version: 0.0.1
+license: Custom
+modules:
+- threadonly
+main_class: ThreadOnly

threadonly.py

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+# Lain Iwakura <lain@serialexperiments.club> 2025
+
+from typing import Tuple
+
+from mautrix.types import RelationType, MessageType
+from mautrix.errors import MForbidden
+from maubot import Plugin, MessageEvent
+from maubot.handlers import command
+
+class ThreadOnly(Plugin):
+    BLOCKLIST = [
+        MessageType.TEXT,
+        MessageType.EMOTE,
+        MessageType.STICKER,
+        MessageType.LOCATION,
+    ]
+
+    @command.passive("", msgtypes=BLOCKLIST)
+    async def handler(self, evt: MessageEvent, match: Tuple[str]) -> None:
+        if evt.content.relates_to.rel_type != RelationType.THREAD:
+            self.log.info(f"redacting {evt.content.msgtype}")
+            
+            try:
+                await evt.redact(reason="Only threads allowed!")
+            except MForbidden:
+                self.log.error("No permission to redact!")
+