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### Guest Access
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There are times when it is desirable for clients to be able to interact
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with rooms without having to fully register for an account on a
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homeserver or join the room. This module specifies how these clients
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should interact with servers in order to participate in rooms as guests.
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Guest users retrieve access tokens from a homeserver using the ordinary
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[register
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endpoint](#post_matrixclientv3register),
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specifying the `kind` parameter as `guest`. They may then interact with
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the client-server API as any other user would, but will only have access
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to a subset of the API as described the Client behaviour subsection
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below. Homeservers may choose not to allow this access at all to their
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local users, but have no information about whether users on other
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homeservers are guests or not.
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Guest users can also upgrade their account by going through the ordinary
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`register` flow, but specifying the additional POST parameter
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`guest_access_token` containing the guest's access token. They are also
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required to specify the `username` parameter to the value of the local
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part of their username, which is otherwise optional.
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This module does not fully factor in federation; it relies on individual
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homeservers properly adhering to the rules set out in this module,
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rather than allowing all homeservers to enforce the rules on each other.
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#### Events
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{{% event event="m.room.guest_access" %}}
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#### Client behaviour
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The following API endpoints are allowed to be accessed by guest accounts
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for retrieving events and associated media:
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* [GET /rooms/{roomId}/state](#get_matrixclientv3roomsroomidstate)
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* [GET /rooms/{roomId}/context/{eventId}](#get_matrixclientv3roomsroomidcontexteventid)
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* [GET /rooms/{roomId}/event/{eventId}](#get_matrixclientv3roomsroomideventeventid)
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* [GET /rooms/{roomId}/state/{eventType}/{stateKey}](#get_matrixclientv3roomsroomidstateeventtypestatekey)
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* [GET /rooms/{roomId}/messages](#get_matrixclientv3roomsroomidmessages)
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* {{< added-in v="1.1" >}} [GET /rooms/{roomId}/members](#get_matrixclientv3roomsroomidmembers)
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* [GET /rooms/{roomId}/initialSync](#get_matrixclientv3roomsroomidinitialsync)
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* [GET /sync](#get_matrixclientv3sync)
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* [GET /events](#get_matrixclientv3events) as used for room previews.
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* {{< added-in v="1.12" >}} [GET /media/download/{serverName}/{mediaId}](#get_matrixclientv1mediadownloadservernamemediaid)
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* {{< added-in v="1.12" >}} [GET /media/download/{serverName}/{mediaId}/{fileName}](#get_matrixclientv1mediadownloadservernamemediaidfilename)
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* {{< added-in v="1.12" >}} [GET /media/thumbnail/{serverName}/{mediaId}](#get_matrixclientv1mediathumbnailservernamemediaid)
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The following API endpoints are allowed to be accessed by guest accounts
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for sending events:
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* [POST /rooms/{roomId}/join](#post_matrixclientv3roomsroomidjoin)
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* [POST /rooms/{roomId}/leave](#post_matrixclientv3roomsroomidleave)
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* [PUT /rooms/{roomId}/send/{eventType}/{txnId}](#put_matrixclientv3roomsroomidsendeventtypetxnid)
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* {{< changed-in v="1.2" >}} Guests can now send *any* event type rather than just `m.room.message` events.
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* {{< added-in v="1.2" >}} [PUT /rooms/{roomId}/state/{eventType}/{stateKey}](#put_matrixclientv3roomsroomidstateeventtypestatekey)
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* [PUT /sendToDevice/{eventType}/{txnId}](#put_matrixclientv3sendtodeviceeventtypetxnid)
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The following API endpoints are allowed to be accessed by guest accounts
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for their own account maintenance:
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* [PUT /profile/{userId}/displayname](#put_matrixclientv3profileuseriddisplayname)
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* [GET /devices](#get_matrixclientv3devices)
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* [GET /devices/{deviceId}](#get_matrixclientv3devicesdeviceid)
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* [PUT /devices/{deviceId}](#put_matrixclientv3devicesdeviceid)
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* {{< added-in v="1.2" >}} [GET /account/whoami](#get_matrixclientv3accountwhoami)
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The following API endpoints are allowed to be accessed by guest accounts
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for end-to-end encryption:
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* [POST /keys/upload](#post_matrixclientv3keysupload)
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* [POST /keys/query](#post_matrixclientv3keysquery)
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* [POST /keys/claim](#post_matrixclientv3keysclaim)
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#### Server behaviour
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Servers MUST only allow guest users to join rooms if the
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`m.room.guest_access` state event is present on the room, and has the
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`guest_access` value `can_join`. If the `m.room.guest_access` event is
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changed to stop this from being the case, the server MUST set those
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users' `m.room.member` state to `leave`.
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#### Security considerations
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Each homeserver manages its own guest accounts itself, and whether an
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account is a guest account or not is not information passed from server
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to server. Accordingly, any server participating in a room is trusted to
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properly enforce the permissions outlined in this section.
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Homeservers may want to enable protections such as captchas for guest
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registration to prevent spam, denial of service, and similar attacks.
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Homeservers may want to put stricter rate limits on guest accounts,
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particularly for sending state events.
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