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+# MSC4365: Canonical ignore list rooms
+
+Keeping up with spam in ignore lists can be hard, and currently requires either a lot of manual labor
+or thoughtfully designed bots to bridge policy lists with user's ignore lists. This has a chance to
+majorly impact server performance at scale. I wish there was a better way to achieve this.
+
+
+## Proposal
+
+I would like to propose adding a `ignored_user_list_rooms` property to `m.ignored_user_list`, to serve
+as an "include"-list for Moderation Policies as they exist today. 
+
+Some of you may already be familiar with a feature that works a lot like this: Element Web's
+"New Ways To Ignore Users" Labs feature!
+
+I would like to have the server help out with this, and prevent clients from receiving the events
+in the first place, as well as eliminating the need to use bot to achieve this behavior.
+
+Example of an updated `m.ignored_user_list`:
+```diff
+{
+  "content": {
+    "ignored_users": {
+      "@someone:example.org": {}
+    },
++    "ignored_user_list_rooms": {
++      "!fTjMjIzNKEsFlUIiru:neko.dev": {
++        "use_globs": true,
++        "use_server_bans": true,
++        "use_banned_rooms": true,
++        "apply_retroactively": true
++      }
++    }
+  },
+  "type": "m.ignored_user_list"
+}
+```
+
+You may notice these additional properties in the schema, that may not make it into the final version of this MSC.
+All of these are optional:
+- `use_globs`: Whether to enable parsing globs, as commonly used in policy lists. These can be a performance hazard.
+- `use_server_bans`: Whether to also ignore users matched by a `m.policy.rule.server` policy.
+- `use_banned_rooms`: Whether to automatically leave rooms banned by a given policy list (including invites).
+- `apply_retroactively`: Whether clients should explicitly remove locally cached messages upon a new policy being written.
+
+To follow a banlist, the user MUST be a joined member of the policy list. This allows servers to always have at least
+one local member in the room.
+
+I would RECOMMEND that clients consider hiding events from users ignored through a policy list retroactively,
+as policy list maintainers or server administrators may wish use this mechanic as a way to hide or remove illegal
+content content, or content that otherwise violates the homeserver's Terms Of Service/Acceptable Use Policy.
+
+## Potential issues
+
+Clients that do clientside filtering for cached messages may not scale very well with this, and will need to be updated
+to handle enforcing policy lists.
+
+## Alternatives
+
+- Keep using a bot for this. Clients that filter their local timeline with the ignored users list will have performance
+ramifications if banlists are being imported with >10k policies (see eg. #community-moderation-effort-bl:neko.dev).
+
+- Implement the bot solution as part of clients. This will cause synchronisation issues as they all race to update the
+ignored user list.
+
+- Do the bridging server side by expanding `ignored_users`. This has the same performance ramifications as the previous
+2 alternatives, as clients aren't being expected to explicitly handle the case of having 10k+ ignore list entries.
+
+## Security considerations
+
+I did not find anything relevant in the OWASP TOP 10.
+
+Thinking logically, there is two ways this could be exploited, that I personally would consider intentional:
+- Servers may be adding a set of required ignore lists on behalf of users. This may be considered beneficial in order to
+keep local users safe in accordance to local server policies.
+
+- Malicious policy list writers may cause mayhem by banning rooms or other users. It is up to the user to pick policy
+lists to follow, that they themselves place trust in.
+
+## Unstable prefix
+
+`s/ignored_user_list_rooms/gay.rory.msc4365.ignored_user_list_rooms/`
+
+## Dependencies
+
+No known dependencies.
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