gist/matrix/m.room.join_rules/README.md

m.room.join_rules

Controls who can join the room. This is best to configure in room settings.

knocking

Requires room version 7

{
    "join_rule": "knock"
}

membership of another room

Requires room version 8 9. Offers only Spaces in room settings

{
    "allow": [
        {
            "room_id": "!whatever:example.net",
            "type": "m.room_membership"
        }
    ],
    "join_rule": "restricted"
}

It can be assumed that multiple spaces is simply copying that more, see below (with exception of join_rule)

merging knocking and membership of another room

Practically the same, but requires room version 10 and new join_rule known as knock_restricted

{
    "allow": [
        {
            "room_id": "!ddFNqIRUacwdicInJz:feneas.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!SxRXoLGlraVfdhZBYy:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!fGtopoZuCySnTsSdsU:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!xFKkXCpcnEwgBEQBFt:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!ruWhXaXgrPjaSSecvb:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!zYPetrOdqxxQYoWCTb:the-apothecary.club",
            "type": "m.room_membership"
        },
        {
            "room_id": "!watercooler-v9:maunium.net",
            "type": "m.room_membership"
        },
        {
            "room_id": "!etDMqntYVqugEClPcE:artemislena.eu",
            "type": "m.room_membership"
        },
        {
            "room_id": "!sOLQNHloevPHIEWcYN:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!KMbEUhVQHLwZHmwzKX:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!rCWNvpCTZHQkiRYUDE:matrix.org",
            "type": "m.room_membership"
        },
        {
            "room_id": "!AUKUBkWpbVaNhXJhuD:vi.fi",
            "type": "m.room_membership"
        },
        {
            "room_id": "!TtWVeGGDmpLieTGJss:pirateriot.net",
            "type": "m.room_membership"
        },
        {
            "room_id": "!xwkzwkGafsaYJOFWoj:the-apothecary.club",
            "type": "m.room_membership"
        },
        {
            "room_id": "!WDaMZSVinTZRLOTajM:hacklab.fi",
            "type": "m.room_membership"
        },
        {
            "room_id": "!IwPxifXSjBLghpVEMh:matrix.org",
            "type": "m.room_membership"
        }
    ],
    "join_rule": "knock_restricted"
}

Note to self

• !psumPMeAfzgAeQpXMG:feneas.org - Mikaela.info (space) - room version 6
• !SxRXoLGlraVfdhZBYy:matrix.org - eu.aminda.space v9
• !fGtopoZuCySnTsSdsU:matrix.org - eu.aminda.space v10
• !xFKkXCpcnEwgBEQBFt:matrix.org - aminda.eu v9
• !ruWhXaXgrPjaSSecvb:matrix.org - aminda.eu v10
• !zYPetrOdqxxQYoWCTb:the-apothecary.club - The Apothecary Community v6
• !watercooler-v9:maunium.net - WaterDuck v9
• !etDMqntYVqugEClPcE:artemislena.eu - Community Moderation Effort v9
• !sOLQNHloevPHIEWcYN:matrix.org - Secure Messaging Apps v6
• !KMbEUhVQHLwZHmwzKX:matrix.org - Matrix Haters v9
• !rCWNvpCTZHQkiRYUDE:matrix.org - Matrix.fi v5
• !AUKUBkWpbVaNhXJhuD:vi.fi - Olohuone v6
• !TtWVeGGDmpLieTGJss:pirateriot.net - GlobalPirates v9
• !xwkzwkGafsaYJOFWoj:the-apothecary.club - Apothecary Homeserver default/welcome room (v5)
• !WDaMZSVinTZRLOTajM:hacklab.fi - Matrix Suomi (Space) v6
• !IwPxifXSjBLghpVEMh:matrix.org - FluffyChat v5