@aminda:pikaviestin.fi: Since there isn't any way to tell whether a room is public/world_readable without joining it, the archive user will join any room requested. But it will only serve content for public rooms and only allow indexing for history_visibility: "world_readable" rooms.

There is no mechanism for leaving a room. But the bot will try to join a room again any time it's requested. It seems like this covers the case around libera.chat?

In reply to @madlittlemods:matrix.org

@aminda:pikaviestin.fi: Since there isn't any way to tell whether a room is public/world_readable without joining it, the archive user will join any room requested. But it will only serve content for public rooms and only allow indexing for history_visibility: "world_readable" rooms.

There is no mechanism for leaving a room. But the bot will try to join a room again any time it's requested. It seems like this covers the case around libera.chat?

In reply to @aminda:pikaviestin.fi

Why does the source code also share history for shared or members only visibility? https://github.com/matrix-org/matrix-public-archive/pull/239

It depends on whether the bot will first leave some of the 250 other rooms or get idle kicked from them as libera.chat will not allow the ghost to join any more channels

Any public room should be viewable in Matrix Public Archive. The idea is if a random Matrix user can view the room, then it should be viewable in the archive. But only history_visibility: "world_readable" rooms are indexable by search engines. Also keep in mind that the Matrix Public Archive holds onto no data (it's stateless) and requests the data from the homeserver every time. archive.matrix.org does have some caching in place (5 minutes for the current day, and 2 days for past content).

I'm currently clarifying this kind of thing in multiple places right now and will add this info to the FAQ

Ahh, sounds like a detail of libera.chat that we don't handle then. There is no special casing for community rules like that

I'm currently clarifying this kind of thing in multiple places right now and will add this info to the FAQ

Added in https://github.com/matrix-org/matrix-public-archive/pull/241

Gnuxie 💜🐝: The archive only shows rooms in these cases:

• m.room.history_visibility is world_readable
• m.room.history_visibility is shared and m.room.join_rules is public

shared room visibility` means "All events in the room are accessible, even those sent when the member was not a part of the room."