Split api/client/membership.rs into directory

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/client/membership/ban.rs

@@ -0,0 +1,60 @@
+use axum::extract::State;
+use ruma::{
+	api::client::membership::ban_user,
+	events::room::member::{MembershipState, RoomMemberEventContent},
+};
+use tuwunel_core::{Err, Result, matrix::pdu::PduBuilder};
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/ban`
+///
+/// Tries to send a ban event into the room.
+pub(crate) async fn ban_user_route(
+	State(services): State<crate::State>,
+	body: Ruma<ban_user::v3::Request>,
+) -> Result<ban_user::v3::Response> {
+	let sender_user = body.sender_user();
+
+	if sender_user == body.user_id {
+		return Err!(Request(Forbidden("You cannot ban yourself.")));
+	}
+
+	let state_lock = services
+		.rooms
+		.state
+		.mutex
+		.lock(&body.room_id)
+		.await;
+
+	let current_member_content = services
+		.rooms
+		.state_accessor
+		.get_member(&body.room_id, &body.user_id)
+		.await
+		.unwrap_or_else(|_| RoomMemberEventContent::new(MembershipState::Ban));
+
+	services
+		.rooms
+		.timeline
+		.build_and_append_pdu(
+			PduBuilder::state(body.user_id.to_string(), &RoomMemberEventContent {
+				membership: MembershipState::Ban,
+				reason: body.reason.clone(),
+				displayname: None, // display name may be offensive
+				avatar_url: None,  // avatar may be offensive
+				is_direct: None,
+				join_authorized_via_users_server: None,
+				third_party_invite: None,
+				..current_member_content
+			}),
+			sender_user,
+			&body.room_id,
+			&state_lock,
+		)
+		.await?;
+
+	drop(state_lock);
+
+	Ok(ban_user::v3::Response::new())
+}

src/api/client/membership/forget.rs

@@ -0,0 +1,70 @@
+use axum::extract::State;
+use futures::pin_mut;
+use ruma::{api::client::membership::forget_room, events::room::member::MembershipState};
+use tuwunel_core::{Err, Result, is_matching, result::NotFound, utils::FutureBoolExt};
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/v3/rooms/{roomId}/forget`
+///
+/// Forgets about a room.
+///
+/// - If the sender user currently left the room: Stops sender user from
+///   receiving information about the room
+///
+/// Note: Other devices of the user have no way of knowing the room was
+/// forgotten, so this has to be called from every device
+pub(crate) async fn forget_room_route(
+	State(services): State<crate::State>,
+	body: Ruma<forget_room::v3::Request>,
+) -> Result<forget_room::v3::Response> {
+	let user_id = body.sender_user();
+	let room_id = &body.room_id;
+
+	let joined = services
+		.rooms
+		.state_cache
+		.is_joined(user_id, room_id);
+	let knocked = services
+		.rooms
+		.state_cache
+		.is_knocked(user_id, room_id);
+	let invited = services
+		.rooms
+		.state_cache
+		.is_invited(user_id, room_id);
+
+	pin_mut!(joined, knocked, invited);
+	if joined.or(knocked).or(invited).await {
+		return Err!(Request(Unknown("You must leave the room before forgetting it")));
+	}
+
+	let membership = services
+		.rooms
+		.state_accessor
+		.get_member(room_id, user_id)
+		.await;
+
+	if membership.is_not_found() {
+		return Err!(Request(Unknown("No membership event was found, room was never joined")));
+	}
+
+	let non_membership = membership
+		.map(|member| member.membership)
+		.is_ok_and(is_matching!(MembershipState::Leave | MembershipState::Ban));
+
+	if non_membership
+		|| services
+			.rooms
+			.state_cache
+			.is_left(user_id, room_id)
+			.await
+	{
+		services
+			.rooms
+			.state_cache
+			.forget(room_id, user_id);
+	}
+
+	Ok(forget_room::v3::Response::new())
+}

src/api/client/membership/invite.rs

@@ -0,0 +1,245 @@
+use axum::extract::State;
+use axum_client_ip::InsecureClientIp;
+use futures::{FutureExt, join};
+use ruma::{
+	OwnedServerName, RoomId, UserId,
+	api::{client::membership::invite_user, federation::membership::create_invite},
+	events::room::member::{MembershipState, RoomMemberEventContent},
+};
+use tuwunel_core::{
+	Err, Result, debug_error, err, info,
+	matrix::pdu::{PduBuilder, gen_event_id_canonical_json},
+};
+use tuwunel_service::Services;
+
+use super::banned_room_check;
+use crate::Ruma;
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/invite`
+///
+/// Tries to send an invite event into the room.
+#[tracing::instrument(skip_all, fields(%client), name = "invite")]
+pub(crate) async fn invite_user_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<invite_user::v3::Request>,
+) -> Result<invite_user::v3::Response> {
+	let sender_user = body.sender_user();
+
+	if !services.users.is_admin(sender_user).await && services.config.block_non_admin_invites {
+		debug_error!(
+			"User {sender_user} is not an admin and attempted to send an invite to room {}",
+			&body.room_id
+		);
+		return Err!(Request(Forbidden("Invites are not allowed on this server.")));
+	}
+
+	banned_room_check(
+		&services,
+		sender_user,
+		Some(&body.room_id),
+		body.room_id.server_name(),
+		client,
+	)
+	.await?;
+
+	match &body.recipient {
+		| invite_user::v3::InvitationRecipient::UserId { user_id } => {
+			let sender_ignored_recipient = services
+				.users
+				.user_is_ignored(sender_user, user_id);
+			let recipient_ignored_by_sender = services
+				.users
+				.user_is_ignored(user_id, sender_user);
+
+			let (sender_ignored_recipient, recipient_ignored_by_sender) =
+				join!(sender_ignored_recipient, recipient_ignored_by_sender);
+
+			if sender_ignored_recipient {
+				return Ok(invite_user::v3::Response {});
+			}
+
+			if let Ok(target_user_membership) = services
+				.rooms
+				.state_accessor
+				.get_member(&body.room_id, user_id)
+				.await
+			{
+				if target_user_membership.membership == MembershipState::Ban {
+					return Err!(Request(Forbidden("User is banned from this room.")));
+				}
+			}
+
+			if recipient_ignored_by_sender {
+				// silently drop the invite to the recipient if they've been ignored by the
+				// sender, pretend it worked
+				return Ok(invite_user::v3::Response {});
+			}
+
+			invite_helper(
+				&services,
+				sender_user,
+				user_id,
+				&body.room_id,
+				body.reason.clone(),
+				false,
+			)
+			.boxed()
+			.await?;
+
+			Ok(invite_user::v3::Response {})
+		},
+		| _ => {
+			Err!(Request(NotFound("User not found.")))
+		},
+	}
+}
+
+pub(crate) async fn invite_helper(
+	services: &Services,
+	sender_user: &UserId,
+	user_id: &UserId,
+	room_id: &RoomId,
+	reason: Option<String>,
+	is_direct: bool,
+) -> Result {
+	if !services.users.is_admin(sender_user).await && services.config.block_non_admin_invites {
+		info!(
+			"User {sender_user} is not an admin and attempted to send an invite to room \
+			 {room_id}"
+		);
+		return Err!(Request(Forbidden("Invites are not allowed on this server.")));
+	}
+
+	if !services.globals.user_is_local(user_id) {
+		let (pdu, pdu_json, invite_room_state) = {
+			let state_lock = services.rooms.state.mutex.lock(room_id).await;
+
+			let content = RoomMemberEventContent {
+				avatar_url: services.users.avatar_url(user_id).await.ok(),
+				is_direct: Some(is_direct),
+				reason,
+				..RoomMemberEventContent::new(MembershipState::Invite)
+			};
+
+			let (pdu, pdu_json) = services
+				.rooms
+				.timeline
+				.create_hash_and_sign_event(
+					PduBuilder::state(user_id.to_string(), &content),
+					sender_user,
+					room_id,
+					&state_lock,
+				)
+				.await?;
+
+			let invite_room_state = services.rooms.state.summary_stripped(&pdu).await;
+
+			drop(state_lock);
+
+			(pdu, pdu_json, invite_room_state)
+		};
+
+		let room_version_id = services
+			.rooms
+			.state
+			.get_room_version(room_id)
+			.await?;
+
+		let response = services
+			.sending
+			.send_federation_request(user_id.server_name(), create_invite::v2::Request {
+				room_id: room_id.to_owned(),
+				event_id: (*pdu.event_id).to_owned(),
+				room_version: room_version_id.clone(),
+				event: services
+					.sending
+					.convert_to_outgoing_federation_event(pdu_json.clone())
+					.await,
+				invite_room_state,
+				via: services
+					.rooms
+					.state_cache
+					.servers_route_via(room_id)
+					.await
+					.ok(),
+			})
+			.await?;
+
+		// We do not add the event_id field to the pdu here because of signature and
+		// hashes checks
+		let (event_id, value) = gen_event_id_canonical_json(&response.event, &room_version_id)
+			.map_err(|e| {
+				err!(Request(BadJson(warn!("Could not convert event to canonical JSON: {e}"))))
+			})?;
+
+		if pdu.event_id != event_id {
+			return Err!(Request(BadJson(warn!(
+				%pdu.event_id, %event_id,
+				"Server {} sent event with wrong event ID",
+				user_id.server_name()
+			))));
+		}
+
+		let origin: OwnedServerName = serde_json::from_value(serde_json::to_value(
+			value
+				.get("origin")
+				.ok_or_else(|| err!(Request(BadJson("Event missing origin field."))))?,
+		)?)
+		.map_err(|e| {
+			err!(Request(BadJson(warn!("Origin field in event is not a valid server name: {e}"))))
+		})?;
+
+		let pdu_id = services
+			.rooms
+			.event_handler
+			.handle_incoming_pdu(&origin, room_id, &event_id, value, true)
+			.boxed()
+			.await?
+			.ok_or_else(|| {
+				err!(Request(InvalidParam("Could not accept incoming PDU as timeline event.")))
+			})?;
+
+		return services
+			.sending
+			.send_pdu_room(room_id, &pdu_id)
+			.await;
+	}
+
+	if !services
+		.rooms
+		.state_cache
+		.is_joined(sender_user, room_id)
+		.await
+	{
+		return Err!(Request(Forbidden(
+			"You must be joined in the room you are trying to invite from."
+		)));
+	}
+
+	let state_lock = services.rooms.state.mutex.lock(room_id).await;
+
+	let content = RoomMemberEventContent {
+		displayname: services.users.displayname(user_id).await.ok(),
+		avatar_url: services.users.avatar_url(user_id).await.ok(),
+		blurhash: services.users.blurhash(user_id).await.ok(),
+		is_direct: Some(is_direct),
+		reason,
+		..RoomMemberEventContent::new(MembershipState::Invite)
+	};
+
+	services
+		.rooms
+		.timeline
+		.build_and_append_pdu(
+			PduBuilder::state(user_id.to_string(), &content),
+			sender_user,
+			room_id,
+			&state_lock,
+		)
+		.await?;
+
+	drop(state_lock);
+
+	Ok(())
+}

src/api/client/membership/kick.rs

@@ -0,0 +1,66 @@
+use axum::extract::State;
+use ruma::{
+	api::client::membership::kick_user,
+	events::room::member::{MembershipState, RoomMemberEventContent},
+};
+use tuwunel_core::{Err, Result, matrix::pdu::PduBuilder};
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/kick`
+///
+/// Tries to send a kick event into the room.
+pub(crate) async fn kick_user_route(
+	State(services): State<crate::State>,
+	body: Ruma<kick_user::v3::Request>,
+) -> Result<kick_user::v3::Response> {
+	let state_lock = services
+		.rooms
+		.state
+		.mutex
+		.lock(&body.room_id)
+		.await;
+
+	let Ok(event) = services
+		.rooms
+		.state_accessor
+		.get_member(&body.room_id, &body.user_id)
+		.await
+	else {
+		// copy synapse's behaviour of returning 200 without any change to the state
+		// instead of erroring on left users
+		return Ok(kick_user::v3::Response::new());
+	};
+
+	if !matches!(
+		event.membership,
+		MembershipState::Invite | MembershipState::Knock | MembershipState::Join,
+	) {
+		return Err!(Request(Forbidden(
+			"Cannot kick a user who is not apart of the room (current membership: {})",
+			event.membership
+		)));
+	}
+
+	services
+		.rooms
+		.timeline
+		.build_and_append_pdu(
+			PduBuilder::state(body.user_id.to_string(), &RoomMemberEventContent {
+				membership: MembershipState::Leave,
+				reason: body.reason.clone(),
+				is_direct: None,
+				join_authorized_via_users_server: None,
+				third_party_invite: None,
+				..event
+			}),
+			body.sender_user(),
+			&body.room_id,
+			&state_lock,
+		)
+		.await?;
+
+	drop(state_lock);
+
+	Ok(kick_user::v3::Response::new())
+}

src/api/client/membership/knock.rs

@@ -0,0 +1,677 @@
+use std::{borrow::Borrow, collections::HashMap, iter::once, sync::Arc};
+
+use axum::extract::State;
+use axum_client_ip::InsecureClientIp;
+use futures::{FutureExt, StreamExt};
+use ruma::{
+	CanonicalJsonObject, CanonicalJsonValue, OwnedEventId, OwnedRoomId, OwnedServerName, RoomId,
+	RoomVersionId, UserId,
+	api::{
+		client::knock::knock_room,
+		federation::{self},
+	},
+	canonical_json::to_canonical_value,
+	events::{
+		StateEventType,
+		room::member::{MembershipState, RoomMemberEventContent},
+	},
+};
+use tuwunel_core::{
+	Err, Result, debug, debug_info, debug_warn, err, info,
+	matrix::pdu::{PduBuilder, PduEvent, gen_event_id},
+	result::FlatOk,
+	trace,
+	utils::{self, shuffle, stream::IterStream},
+	warn,
+};
+use tuwunel_service::{
+	Services,
+	rooms::{
+		state::RoomMutexGuard,
+		state_compressor::{CompressedState, HashSetCompressStateEvent},
+	},
+};
+
+use super::banned_room_check;
+use crate::Ruma;
+
+/// # `POST /_matrix/client/*/knock/{roomIdOrAlias}`
+///
+/// Tries to knock the room to ask permission to join for the sender user.
+#[tracing::instrument(skip_all, fields(%client), name = "knock")]
+pub(crate) async fn knock_room_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<knock_room::v3::Request>,
+) -> Result<knock_room::v3::Response> {
+	let sender_user = body.sender_user();
+	let body = &body.body;
+
+	let (servers, room_id) = match OwnedRoomId::try_from(body.room_id_or_alias.clone()) {
+		| Ok(room_id) => {
+			banned_room_check(
+				&services,
+				sender_user,
+				Some(&room_id),
+				room_id.server_name(),
+				client,
+			)
+			.await?;
+
+			let mut servers = body.via.clone();
+			servers.extend(
+				services
+					.rooms
+					.state_cache
+					.servers_invite_via(&room_id)
+					.map(ToOwned::to_owned)
+					.collect::<Vec<_>>()
+					.await,
+			);
+
+			servers.extend(
+				services
+					.rooms
+					.state_cache
+					.invite_state(sender_user, &room_id)
+					.await
+					.unwrap_or_default()
+					.iter()
+					.filter_map(|event| event.get_field("sender").ok().flatten())
+					.filter_map(|sender: &str| UserId::parse(sender).ok())
+					.map(|user| user.server_name().to_owned()),
+			);
+
+			if let Some(server) = room_id.server_name() {
+				servers.push(server.to_owned());
+			}
+
+			servers.sort_unstable();
+			servers.dedup();
+			shuffle(&mut servers);
+
+			(servers, room_id)
+		},
+		| Err(room_alias) => {
+			let (room_id, mut servers) = services
+				.rooms
+				.alias
+				.resolve_alias(&room_alias, Some(body.via.clone()))
+				.await?;
+
+			banned_room_check(
+				&services,
+				sender_user,
+				Some(&room_id),
+				Some(room_alias.server_name()),
+				client,
+			)
+			.await?;
+
+			let addl_via_servers = services
+				.rooms
+				.state_cache
+				.servers_invite_via(&room_id)
+				.map(ToOwned::to_owned);
+
+			let addl_state_servers = services
+				.rooms
+				.state_cache
+				.invite_state(sender_user, &room_id)
+				.await
+				.unwrap_or_default();
+
+			let mut addl_servers: Vec<_> = addl_state_servers
+				.iter()
+				.map(|event| event.get_field("sender"))
+				.filter_map(FlatOk::flat_ok)
+				.map(|user: &UserId| user.server_name().to_owned())
+				.stream()
+				.chain(addl_via_servers)
+				.collect()
+				.await;
+
+			addl_servers.sort_unstable();
+			addl_servers.dedup();
+			shuffle(&mut addl_servers);
+			servers.append(&mut addl_servers);
+
+			(servers, room_id)
+		},
+	};
+
+	knock_room_by_id_helper(&services, sender_user, &room_id, body.reason.clone(), &servers)
+		.boxed()
+		.await
+}
+
+async fn knock_room_by_id_helper(
+	services: &Services,
+	sender_user: &UserId,
+	room_id: &RoomId,
+	reason: Option<String>,
+	servers: &[OwnedServerName],
+) -> Result<knock_room::v3::Response> {
+	let state_lock = services.rooms.state.mutex.lock(room_id).await;
+
+	if services
+		.rooms
+		.state_cache
+		.is_invited(sender_user, room_id)
+		.await
+	{
+		debug_warn!("{sender_user} is already invited in {room_id} but attempted to knock");
+		return Err!(Request(Forbidden(
+			"You cannot knock on a room you are already invited/accepted to."
+		)));
+	}
+
+	if services
+		.rooms
+		.state_cache
+		.is_joined(sender_user, room_id)
+		.await
+	{
+		debug_warn!("{sender_user} is already joined in {room_id} but attempted to knock");
+		return Err!(Request(Forbidden("You cannot knock on a room you are already joined in.")));
+	}
+
+	if services
+		.rooms
+		.state_cache
+		.is_knocked(sender_user, room_id)
+		.await
+	{
+		debug_warn!("{sender_user} is already knocked in {room_id}");
+		return Ok(knock_room::v3::Response { room_id: room_id.into() });
+	}
+
+	if let Ok(membership) = services
+		.rooms
+		.state_accessor
+		.get_member(room_id, sender_user)
+		.await
+	{
+		if membership.membership == MembershipState::Ban {
+			debug_warn!("{sender_user} is banned from {room_id} but attempted to knock");
+			return Err!(Request(Forbidden("You cannot knock on a room you are banned from.")));
+		}
+	}
+
+	let server_in_room = services
+		.rooms
+		.state_cache
+		.server_in_room(services.globals.server_name(), room_id)
+		.await;
+
+	let local_knock = server_in_room
+		|| servers.is_empty()
+		|| (servers.len() == 1 && services.globals.server_is_ours(&servers[0]));
+
+	if local_knock {
+		knock_room_helper_local(services, sender_user, room_id, reason, servers, state_lock)
+			.boxed()
+			.await?;
+	} else {
+		knock_room_helper_remote(services, sender_user, room_id, reason, servers, state_lock)
+			.boxed()
+			.await?;
+	}
+
+	Ok(knock_room::v3::Response::new(room_id.to_owned()))
+}
+
+async fn knock_room_helper_local(
+	services: &Services,
+	sender_user: &UserId,
+	room_id: &RoomId,
+	reason: Option<String>,
+	servers: &[OwnedServerName],
+	state_lock: RoomMutexGuard,
+) -> Result {
+	debug_info!("We can knock locally");
+
+	let room_version_id = services
+		.rooms
+		.state
+		.get_room_version(room_id)
+		.await?;
+
+	if matches!(
+		room_version_id,
+		RoomVersionId::V1
+			| RoomVersionId::V2
+			| RoomVersionId::V3
+			| RoomVersionId::V4
+			| RoomVersionId::V5
+			| RoomVersionId::V6
+	) {
+		return Err!(Request(Forbidden("This room does not support knocking.")));
+	}
+
+	let content = RoomMemberEventContent {
+		displayname: services.users.displayname(sender_user).await.ok(),
+		avatar_url: services.users.avatar_url(sender_user).await.ok(),
+		blurhash: services.users.blurhash(sender_user).await.ok(),
+		reason: reason.clone(),
+		..RoomMemberEventContent::new(MembershipState::Knock)
+	};
+
+	// Try normal knock first
+	let Err(error) = services
+		.rooms
+		.timeline
+		.build_and_append_pdu(
+			PduBuilder::state(sender_user.to_string(), &content),
+			sender_user,
+			room_id,
+			&state_lock,
+		)
+		.await
+	else {
+		return Ok(());
+	};
+
+	if servers.is_empty() || (servers.len() == 1 && services.globals.server_is_ours(&servers[0]))
+	{
+		return Err(error);
+	}
+
+	warn!("We couldn't do the knock locally, maybe federation can help to satisfy the knock");
+
+	let (make_knock_response, remote_server) =
+		make_knock_request(services, sender_user, room_id, servers).await?;
+
+	info!("make_knock finished");
+
+	let room_version_id = make_knock_response.room_version;
+
+	if !services
+		.server
+		.supported_room_version(&room_version_id)
+	{
+		return Err!(BadServerResponse(
+			"Remote room version {room_version_id} is not supported by conduwuit"
+		));
+	}
+
+	let mut knock_event_stub = serde_json::from_str::<CanonicalJsonObject>(
+		make_knock_response.event.get(),
+	)
+	.map_err(|e| {
+		err!(BadServerResponse("Invalid make_knock event json received from server: {e:?}"))
+	})?;
+
+	knock_event_stub.insert(
+		"origin".to_owned(),
+		CanonicalJsonValue::String(services.globals.server_name().as_str().to_owned()),
+	);
+	knock_event_stub.insert(
+		"origin_server_ts".to_owned(),
+		CanonicalJsonValue::Integer(
+			utils::millis_since_unix_epoch()
+				.try_into()
+				.expect("Timestamp is valid js_int value"),
+		),
+	);
+	knock_event_stub.insert(
+		"content".to_owned(),
+		to_canonical_value(RoomMemberEventContent {
+			displayname: services.users.displayname(sender_user).await.ok(),
+			avatar_url: services.users.avatar_url(sender_user).await.ok(),
+			blurhash: services.users.blurhash(sender_user).await.ok(),
+			reason,
+			..RoomMemberEventContent::new(MembershipState::Knock)
+		})
+		.expect("event is valid, we just created it"),
+	);
+
+	// In order to create a compatible ref hash (EventID) the `hashes` field needs
+	// to be present
+	services
+		.server_keys
+		.hash_and_sign_event(&mut knock_event_stub, &room_version_id)?;
+
+	// Generate event id
+	let event_id = gen_event_id(&knock_event_stub, &room_version_id)?;
+
+	// Add event_id
+	knock_event_stub
+		.insert("event_id".to_owned(), CanonicalJsonValue::String(event_id.clone().into()));
+
+	// It has enough fields to be called a proper event now
+	let knock_event = knock_event_stub;
+
+	info!("Asking {remote_server} for send_knock in room {room_id}");
+	let send_knock_request = federation::knock::send_knock::v1::Request {
+		room_id: room_id.to_owned(),
+		event_id: event_id.clone(),
+		pdu: services
+			.sending
+			.convert_to_outgoing_federation_event(knock_event.clone())
+			.await,
+	};
+
+	let send_knock_response = services
+		.sending
+		.send_federation_request(&remote_server, send_knock_request)
+		.await?;
+
+	info!("send_knock finished");
+
+	services
+		.rooms
+		.short
+		.get_or_create_shortroomid(room_id)
+		.await;
+
+	info!("Parsing knock event");
+
+	let parsed_knock_pdu = PduEvent::from_id_val(&event_id, knock_event.clone())
+		.map_err(|e| err!(BadServerResponse("Invalid knock event PDU: {e:?}")))?;
+
+	info!("Updating membership locally to knock state with provided stripped state events");
+	services
+		.rooms
+		.state_cache
+		.update_membership(
+			room_id,
+			sender_user,
+			parsed_knock_pdu
+				.get_content::<RoomMemberEventContent>()
+				.expect("we just created this"),
+			sender_user,
+			Some(send_knock_response.knock_room_state),
+			None,
+			false,
+		)
+		.await?;
+
+	info!("Appending room knock event locally");
+	services
+		.rooms
+		.timeline
+		.append_pdu(
+			&parsed_knock_pdu,
+			knock_event,
+			once(parsed_knock_pdu.event_id.borrow()),
+			&state_lock,
+		)
+		.await?;
+
+	Ok(())
+}
+
+async fn knock_room_helper_remote(
+	services: &Services,
+	sender_user: &UserId,
+	room_id: &RoomId,
+	reason: Option<String>,
+	servers: &[OwnedServerName],
+	state_lock: RoomMutexGuard,
+) -> Result {
+	info!("Knocking {room_id} over federation.");
+
+	let (make_knock_response, remote_server) =
+		make_knock_request(services, sender_user, room_id, servers).await?;
+
+	info!("make_knock finished");
+
+	let room_version_id = make_knock_response.room_version;
+
+	if !services
+		.server
+		.supported_room_version(&room_version_id)
+	{
+		return Err!(BadServerResponse(
+			"Remote room version {room_version_id} is not supported by conduwuit"
+		));
+	}
+
+	let mut knock_event_stub: CanonicalJsonObject =
+		serde_json::from_str(make_knock_response.event.get()).map_err(|e| {
+			err!(BadServerResponse("Invalid make_knock event json received from server: {e:?}"))
+		})?;
+
+	knock_event_stub.insert(
+		"origin".to_owned(),
+		CanonicalJsonValue::String(services.globals.server_name().as_str().to_owned()),
+	);
+	knock_event_stub.insert(
+		"origin_server_ts".to_owned(),
+		CanonicalJsonValue::Integer(
+			utils::millis_since_unix_epoch()
+				.try_into()
+				.expect("Timestamp is valid js_int value"),
+		),
+	);
+	knock_event_stub.insert(
+		"content".to_owned(),
+		to_canonical_value(RoomMemberEventContent {
+			displayname: services.users.displayname(sender_user).await.ok(),
+			avatar_url: services.users.avatar_url(sender_user).await.ok(),
+			blurhash: services.users.blurhash(sender_user).await.ok(),
+			reason,
+			..RoomMemberEventContent::new(MembershipState::Knock)
+		})
+		.expect("event is valid, we just created it"),
+	);
+
+	// In order to create a compatible ref hash (EventID) the `hashes` field needs
+	// to be present
+	services
+		.server_keys
+		.hash_and_sign_event(&mut knock_event_stub, &room_version_id)?;
+
+	// Generate event id
+	let event_id = gen_event_id(&knock_event_stub, &room_version_id)?;
+
+	// Add event_id
+	knock_event_stub
+		.insert("event_id".to_owned(), CanonicalJsonValue::String(event_id.clone().into()));
+
+	// It has enough fields to be called a proper event now
+	let knock_event = knock_event_stub;
+
+	info!("Asking {remote_server} for send_knock in room {room_id}");
+	let send_knock_request = federation::knock::send_knock::v1::Request {
+		room_id: room_id.to_owned(),
+		event_id: event_id.clone(),
+		pdu: services
+			.sending
+			.convert_to_outgoing_federation_event(knock_event.clone())
+			.await,
+	};
+
+	let send_knock_response = services
+		.sending
+		.send_federation_request(&remote_server, send_knock_request)
+		.await?;
+
+	info!("send_knock finished");
+
+	services
+		.rooms
+		.short
+		.get_or_create_shortroomid(room_id)
+		.await;
+
+	info!("Parsing knock event");
+	let parsed_knock_pdu = PduEvent::from_id_val(&event_id, knock_event.clone())
+		.map_err(|e| err!(BadServerResponse("Invalid knock event PDU: {e:?}")))?;
+
+	info!("Going through send_knock response knock state events");
+	let state = send_knock_response
+		.knock_room_state
+		.iter()
+		.map(|event| serde_json::from_str::<CanonicalJsonObject>(event.clone().into_json().get()))
+		.filter_map(Result::ok);
+
+	let mut state_map: HashMap<u64, OwnedEventId> = HashMap::new();
+
+	for event in state {
+		let Some(state_key) = event.get("state_key") else {
+			debug_warn!("send_knock stripped state event missing state_key: {event:?}");
+			continue;
+		};
+		let Some(event_type) = event.get("type") else {
+			debug_warn!("send_knock stripped state event missing event type: {event:?}");
+			continue;
+		};
+
+		let Ok(state_key) = serde_json::from_value::<String>(state_key.clone().into()) else {
+			debug_warn!("send_knock stripped state event has invalid state_key: {event:?}");
+			continue;
+		};
+		let Ok(event_type) = serde_json::from_value::<StateEventType>(event_type.clone().into())
+		else {
+			debug_warn!("send_knock stripped state event has invalid event type: {event:?}");
+			continue;
+		};
+
+		let event_id = gen_event_id(&event, &room_version_id)?;
+		let shortstatekey = services
+			.rooms
+			.short
+			.get_or_create_shortstatekey(&event_type, &state_key)
+			.await;
+
+		services
+			.rooms
+			.outlier
+			.add_pdu_outlier(&event_id, &event);
+		state_map.insert(shortstatekey, event_id.clone());
+	}
+
+	info!("Compressing state from send_knock");
+	let compressed: CompressedState = services
+		.rooms
+		.state_compressor
+		.compress_state_events(
+			state_map
+				.iter()
+				.map(|(ssk, eid)| (ssk, eid.borrow())),
+		)
+		.collect()
+		.await;
+
+	debug!("Saving compressed state");
+	let HashSetCompressStateEvent {
+		shortstatehash: statehash_before_knock,
+		added,
+		removed,
+	} = services
+		.rooms
+		.state_compressor
+		.save_state(room_id, Arc::new(compressed))
+		.await?;
+
+	debug!("Forcing state for new room");
+	services
+		.rooms
+		.state
+		.force_state(room_id, statehash_before_knock, added, removed, &state_lock)
+		.await?;
+
+	let statehash_after_knock = services
+		.rooms
+		.state
+		.append_to_state(&parsed_knock_pdu)
+		.await?;
+
+	info!("Updating membership locally to knock state with provided stripped state events");
+	services
+		.rooms
+		.state_cache
+		.update_membership(
+			room_id,
+			sender_user,
+			parsed_knock_pdu
+				.get_content::<RoomMemberEventContent>()
+				.expect("we just created this"),
+			sender_user,
+			Some(send_knock_response.knock_room_state),
+			None,
+			false,
+		)
+		.await?;
+
+	info!("Appending room knock event locally");
+	services
+		.rooms
+		.timeline
+		.append_pdu(
+			&parsed_knock_pdu,
+			knock_event,
+			once(parsed_knock_pdu.event_id.borrow()),
+			&state_lock,
+		)
+		.await?;
+
+	info!("Setting final room state for new room");
+	// We set the room state after inserting the pdu, so that we never have a moment
+	// in time where events in the current room state do not exist
+	services
+		.rooms
+		.state
+		.set_room_state(room_id, statehash_after_knock, &state_lock);
+
+	Ok(())
+}
+
+async fn make_knock_request(
+	services: &Services,
+	sender_user: &UserId,
+	room_id: &RoomId,
+	servers: &[OwnedServerName],
+) -> Result<(federation::knock::create_knock_event_template::v1::Response, OwnedServerName)> {
+	let mut make_knock_response_and_server =
+		Err!(BadServerResponse("No server available to assist in knocking."));
+
+	let mut make_knock_counter: usize = 0;
+
+	for remote_server in servers {
+		if services.globals.server_is_ours(remote_server) {
+			continue;
+		}
+
+		info!("Asking {remote_server} for make_knock ({make_knock_counter})");
+
+		let make_knock_response = services
+			.sending
+			.send_federation_request(
+				remote_server,
+				federation::knock::create_knock_event_template::v1::Request {
+					room_id: room_id.to_owned(),
+					user_id: sender_user.to_owned(),
+					ver: services
+						.server
+						.supported_room_versions()
+						.collect(),
+				},
+			)
+			.await;
+
+		trace!("make_knock response: {make_knock_response:?}");
+		make_knock_counter = make_knock_counter.saturating_add(1);
+
+		make_knock_response_and_server = make_knock_response.map(|r| (r, remote_server.clone()));
+
+		if make_knock_response_and_server.is_ok() {
+			break;
+		}
+
+		if make_knock_counter > 40 {
+			warn!(
+				"50 servers failed to provide valid make_knock response, assuming no server can \
+				 assist in knocking."
+			);
+			make_knock_response_and_server =
+				Err!(BadServerResponse("No server available to assist in knocking."));
+
+			return make_knock_response_and_server;
+		}
+	}
+
+	make_knock_response_and_server
+}

src/api/client/membership/leave.rs

@@ -0,0 +1,397 @@
+use std::collections::HashSet;
+
+use axum::extract::State;
+use futures::{FutureExt, StreamExt, TryFutureExt, pin_mut};
+use ruma::{
+	CanonicalJsonObject, CanonicalJsonValue, OwnedServerName, RoomId, RoomVersionId, UserId,
+	api::{
+		client::membership::leave_room,
+		federation::{self},
+	},
+	events::{
+		StateEventType,
+		room::member::{MembershipState, RoomMemberEventContent},
+	},
+};
+use tuwunel_core::{
+	Err, Result, debug_info, debug_warn, err,
+	matrix::pdu::{PduBuilder, gen_event_id},
+	utils::{self, FutureBoolExt, future::ReadyEqExt},
+	warn,
+};
+use tuwunel_service::Services;
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/v3/rooms/{roomId}/leave`
+///
+/// Tries to leave the sender user from a room.
+///
+/// - This should always work if the user is currently joined.
+pub(crate) async fn leave_room_route(
+	State(services): State<crate::State>,
+	body: Ruma<leave_room::v3::Request>,
+) -> Result<leave_room::v3::Response> {
+	leave_room(&services, body.sender_user(), &body.room_id, body.reason.clone())
+		.boxed()
+		.await
+		.map(|()| leave_room::v3::Response::new())
+}
+
+// Make a user leave all their joined rooms, rescinds knocks, forgets all rooms,
+// and ignores errors
+pub async fn leave_all_rooms(services: &Services, user_id: &UserId) {
+	let rooms_joined = services
+		.rooms
+		.state_cache
+		.rooms_joined(user_id)
+		.map(ToOwned::to_owned);
+
+	let rooms_invited = services
+		.rooms
+		.state_cache
+		.rooms_invited(user_id)
+		.map(|(r, _)| r);
+
+	let rooms_knocked = services
+		.rooms
+		.state_cache
+		.rooms_knocked(user_id)
+		.map(|(r, _)| r);
+
+	let all_rooms: Vec<_> = rooms_joined
+		.chain(rooms_invited)
+		.chain(rooms_knocked)
+		.collect()
+		.await;
+
+	for room_id in all_rooms {
+		// ignore errors
+		if let Err(e) = leave_room(services, user_id, &room_id, None)
+			.boxed()
+			.await
+		{
+			warn!(%user_id, "Failed to leave {room_id} remotely: {e}");
+		}
+
+		services
+			.rooms
+			.state_cache
+			.forget(&room_id, user_id);
+	}
+}
+
+pub async fn leave_room(
+	services: &Services,
+	user_id: &UserId,
+	room_id: &RoomId,
+	reason: Option<String>,
+) -> Result {
+	let default_member_content = RoomMemberEventContent {
+		membership: MembershipState::Leave,
+		reason: reason.clone(),
+		join_authorized_via_users_server: None,
+		is_direct: None,
+		avatar_url: None,
+		displayname: None,
+		third_party_invite: None,
+		blurhash: None,
+	};
+
+	let is_banned = services.rooms.metadata.is_banned(room_id);
+	let is_disabled = services.rooms.metadata.is_disabled(room_id);
+
+	pin_mut!(is_banned, is_disabled);
+	if is_banned.or(is_disabled).await {
+		// the room is banned/disabled, the room must be rejected locally since we
+		// cant/dont want to federate with this server
+		services
+			.rooms
+			.state_cache
+			.update_membership(
+				room_id,
+				user_id,
+				default_member_content,
+				user_id,
+				None,
+				None,
+				true,
+			)
+			.await?;
+
+		return Ok(());
+	}
+
+	let dont_have_room = services
+		.rooms
+		.state_cache
+		.server_in_room(services.globals.server_name(), room_id)
+		.eq(&false);
+
+	let not_knocked = services
+		.rooms
+		.state_cache
+		.is_knocked(user_id, room_id)
+		.eq(&false);
+
+	// Ask a remote server if we don't have this room and are not knocking on it
+	if dont_have_room.and(not_knocked).await {
+		if let Err(e) = remote_leave_room(services, user_id, room_id)
+			.boxed()
+			.await
+		{
+			warn!(%user_id, "Failed to leave room {room_id} remotely: {e}");
+			// Don't tell the client about this error
+		}
+
+		let last_state = services
+			.rooms
+			.state_cache
+			.invite_state(user_id, room_id)
+			.or_else(|_| {
+				services
+					.rooms
+					.state_cache
+					.knock_state(user_id, room_id)
+			})
+			.or_else(|_| {
+				services
+					.rooms
+					.state_cache
+					.left_state(user_id, room_id)
+			})
+			.await
+			.ok();
+
+		// We always drop the invite, we can't rely on other servers
+		services
+			.rooms
+			.state_cache
+			.update_membership(
+				room_id,
+				user_id,
+				default_member_content,
+				user_id,
+				last_state,
+				None,
+				true,
+			)
+			.await?;
+	} else {
+		let state_lock = services.rooms.state.mutex.lock(room_id).await;
+
+		let Ok(event) = services
+			.rooms
+			.state_accessor
+			.room_state_get_content::<RoomMemberEventContent>(
+				room_id,
+				&StateEventType::RoomMember,
+				user_id.as_str(),
+			)
+			.await
+		else {
+			debug_warn!(
+				"Trying to leave a room you are not a member of, marking room as left locally."
+			);
+
+			return services
+				.rooms
+				.state_cache
+				.update_membership(
+					room_id,
+					user_id,
+					default_member_content,
+					user_id,
+					None,
+					None,
+					true,
+				)
+				.await;
+		};
+
+		services
+			.rooms
+			.timeline
+			.build_and_append_pdu(
+				PduBuilder::state(user_id.to_string(), &RoomMemberEventContent {
+					membership: MembershipState::Leave,
+					reason,
+					join_authorized_via_users_server: None,
+					is_direct: None,
+					..event
+				}),
+				user_id,
+				room_id,
+				&state_lock,
+			)
+			.await?;
+	}
+
+	Ok(())
+}
+
+async fn remote_leave_room(
+	services: &Services,
+	user_id: &UserId,
+	room_id: &RoomId,
+) -> Result<()> {
+	let mut make_leave_response_and_server =
+		Err!(BadServerResponse("No remote server available to assist in leaving {room_id}."));
+
+	let mut servers: HashSet<OwnedServerName> = services
+		.rooms
+		.state_cache
+		.servers_invite_via(room_id)
+		.map(ToOwned::to_owned)
+		.collect()
+		.await;
+
+	match services
+		.rooms
+		.state_cache
+		.invite_state(user_id, room_id)
+		.await
+	{
+		| Ok(invite_state) => {
+			servers.extend(
+				invite_state
+					.iter()
+					.filter_map(|event| event.get_field("sender").ok().flatten())
+					.filter_map(|sender: &str| UserId::parse(sender).ok())
+					.map(|user| user.server_name().to_owned()),
+			);
+		},
+		| _ => {
+			match services
+				.rooms
+				.state_cache
+				.knock_state(user_id, room_id)
+				.await
+			{
+				| Ok(knock_state) => {
+					servers.extend(
+						knock_state
+							.iter()
+							.filter_map(|event| event.get_field("sender").ok().flatten())
+							.filter_map(|sender: &str| UserId::parse(sender).ok())
+							.filter_map(|sender| {
+								if !services.globals.user_is_local(sender) {
+									Some(sender.server_name().to_owned())
+								} else {
+									None
+								}
+							}),
+					);
+				},
+				| _ => {},
+			}
+		},
+	}
+
+	if let Some(room_id_server_name) = room_id.server_name() {
+		servers.insert(room_id_server_name.to_owned());
+	}
+
+	debug_info!("servers in remote_leave_room: {servers:?}");
+
+	for remote_server in servers {
+		let make_leave_response = services
+			.sending
+			.send_federation_request(
+				&remote_server,
+				federation::membership::prepare_leave_event::v1::Request {
+					room_id: room_id.to_owned(),
+					user_id: user_id.to_owned(),
+				},
+			)
+			.await;
+
+		make_leave_response_and_server = make_leave_response.map(|r| (r, remote_server));
+
+		if make_leave_response_and_server.is_ok() {
+			break;
+		}
+	}
+
+	let (make_leave_response, remote_server) = make_leave_response_and_server?;
+
+	let Some(room_version_id) = make_leave_response.room_version else {
+		return Err!(BadServerResponse(warn!(
+			"No room version was returned by {remote_server} for {room_id}, room version is \
+			 likely not supported by conduwuit"
+		)));
+	};
+
+	if !services
+		.server
+		.supported_room_version(&room_version_id)
+	{
+		return Err!(BadServerResponse(warn!(
+			"Remote room version {room_version_id} for {room_id} is not supported by conduwuit",
+		)));
+	}
+
+	let mut leave_event_stub = serde_json::from_str::<CanonicalJsonObject>(
+		make_leave_response.event.get(),
+	)
+	.map_err(|e| {
+		err!(BadServerResponse(warn!(
+			"Invalid make_leave event json received from {remote_server} for {room_id}: {e:?}"
+		)))
+	})?;
+
+	// TODO: Is origin needed?
+	leave_event_stub.insert(
+		"origin".to_owned(),
+		CanonicalJsonValue::String(services.globals.server_name().as_str().to_owned()),
+	);
+	leave_event_stub.insert(
+		"origin_server_ts".to_owned(),
+		CanonicalJsonValue::Integer(
+			utils::millis_since_unix_epoch()
+				.try_into()
+				.expect("Timestamp is valid js_int value"),
+		),
+	);
+
+	// room v3 and above removed the "event_id" field from remote PDU format
+	match room_version_id {
+		| RoomVersionId::V1 | RoomVersionId::V2 => {},
+		| _ => {
+			leave_event_stub.remove("event_id");
+		},
+	}
+
+	// In order to create a compatible ref hash (EventID) the `hashes` field needs
+	// to be present
+	services
+		.server_keys
+		.hash_and_sign_event(&mut leave_event_stub, &room_version_id)?;
+
+	// Generate event id
+	let event_id = gen_event_id(&leave_event_stub, &room_version_id)?;
+
+	// Add event_id back
+	leave_event_stub
+		.insert("event_id".to_owned(), CanonicalJsonValue::String(event_id.clone().into()));
+
+	// It has enough fields to be called a proper event now
+	let leave_event = leave_event_stub;
+
+	services
+		.sending
+		.send_federation_request(
+			&remote_server,
+			federation::membership::create_leave_event::v2::Request {
+				room_id: room_id.to_owned(),
+				event_id,
+				pdu: services
+					.sending
+					.convert_to_outgoing_federation_event(leave_event.clone())
+					.await,
+			},
+		)
+		.await?;
+
+	Ok(())
+}

src/api/client/membership/members.rs

@@ -0,0 +1,150 @@
+use axum::extract::State;
+use futures::{StreamExt, future::join};
+use ruma::{
+	api::client::membership::{
+		get_member_events::{self, v3::MembershipEventFilter},
+		joined_members::{self, v3::RoomMember},
+	},
+	events::{
+		StateEventType,
+		room::member::{MembershipState, RoomMemberEventContent},
+	},
+};
+use tuwunel_core::{
+	Err, Event, Result, at,
+	matrix::pdu::PduEvent,
+	utils::{
+		future::TryExtExt,
+		stream::{BroadbandExt, ReadyExt},
+	},
+};
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/members`
+///
+/// Lists all joined users in a room (TODO: at a specific point in time, with a
+/// specific membership).
+///
+/// - Only works if the user is currently joined
+pub(crate) async fn get_member_events_route(
+	State(services): State<crate::State>,
+	body: Ruma<get_member_events::v3::Request>,
+) -> Result<get_member_events::v3::Response> {
+	let sender_user = body.sender_user();
+	let membership = body.membership.as_ref();
+	let not_membership = body.not_membership.as_ref();
+
+	if !services
+		.rooms
+		.state_accessor
+		.user_can_see_state_events(sender_user, &body.room_id)
+		.await
+	{
+		return Err!(Request(Forbidden("You don't have permission to view this room.")));
+	}
+
+	Ok(get_member_events::v3::Response {
+		chunk: services
+			.rooms
+			.state_accessor
+			.room_state_full(&body.room_id)
+			.ready_filter_map(Result::ok)
+			.ready_filter(|((ty, _), _)| *ty == StateEventType::RoomMember)
+			.map(at!(1))
+			.ready_filter_map(|pdu| membership_filter(pdu, membership, not_membership))
+			.map(Event::into_format)
+			.collect()
+			.await,
+	})
+}
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/joined_members`
+///
+/// Lists all members of a room.
+///
+/// - The sender user must be in the room
+/// - TODO: An appservice just needs a puppet joined
+pub(crate) async fn joined_members_route(
+	State(services): State<crate::State>,
+	body: Ruma<joined_members::v3::Request>,
+) -> Result<joined_members::v3::Response> {
+	if !services
+		.rooms
+		.state_accessor
+		.user_can_see_state_events(body.sender_user(), &body.room_id)
+		.await
+	{
+		return Err!(Request(Forbidden("You don't have permission to view this room.")));
+	}
+
+	Ok(joined_members::v3::Response {
+		joined: services
+			.rooms
+			.state_cache
+			.room_members(&body.room_id)
+			.map(ToOwned::to_owned)
+			.broad_then(|user_id| async move {
+				let (display_name, avatar_url) = join(
+					services.users.displayname(&user_id).ok(),
+					services.users.avatar_url(&user_id).ok(),
+				)
+				.await;
+
+				(user_id, RoomMember { display_name, avatar_url })
+			})
+			.collect()
+			.await,
+	})
+}
+
+fn membership_filter(
+	pdu: PduEvent,
+	for_membership: Option<&MembershipEventFilter>,
+	not_membership: Option<&MembershipEventFilter>,
+) -> Option<PduEvent> {
+	let membership_state_filter = match for_membership {
+		| Some(MembershipEventFilter::Ban) => MembershipState::Ban,
+		| Some(MembershipEventFilter::Invite) => MembershipState::Invite,
+		| Some(MembershipEventFilter::Knock) => MembershipState::Knock,
+		| Some(MembershipEventFilter::Leave) => MembershipState::Leave,
+		| Some(_) | None => MembershipState::Join,
+	};
+
+	let not_membership_state_filter = match not_membership {
+		| Some(MembershipEventFilter::Ban) => MembershipState::Ban,
+		| Some(MembershipEventFilter::Invite) => MembershipState::Invite,
+		| Some(MembershipEventFilter::Join) => MembershipState::Join,
+		| Some(MembershipEventFilter::Knock) => MembershipState::Knock,
+		| Some(_) | None => MembershipState::Leave,
+	};
+
+	let evt_membership = pdu
+		.get_content::<RoomMemberEventContent>()
+		.ok()?
+		.membership;
+
+	if for_membership.is_some() && not_membership.is_some() {
+		if membership_state_filter != evt_membership
+			|| not_membership_state_filter == evt_membership
+		{
+			None
+		} else {
+			Some(pdu)
+		}
+	} else if for_membership.is_some() && not_membership.is_none() {
+		if membership_state_filter != evt_membership {
+			None
+		} else {
+			Some(pdu)
+		}
+	} else if not_membership.is_some() && for_membership.is_none() {
+		if not_membership_state_filter == evt_membership {
+			None
+		} else {
+			Some(pdu)
+		}
+	} else {
+		Some(pdu)
+	}
+}

src/api/client/membership/mod.rs

@@ -0,0 +1,169 @@
+mod ban;
+mod forget;
+mod invite;
+mod join;
+mod kick;
+mod knock;
+mod leave;
+mod members;
+mod unban;
+
+use std::net::IpAddr;
+
+use axum::extract::State;
+use futures::{FutureExt, StreamExt};
+use ruma::{OwnedRoomId, RoomId, ServerName, UserId, api::client::membership::joined_rooms};
+use tuwunel_core::{Err, Result, warn};
+use tuwunel_service::Services;
+
+pub(crate) use self::{
+	ban::ban_user_route,
+	forget::forget_room_route,
+	invite::{invite_helper, invite_user_route},
+	join::{join_room_by_id_or_alias_route, join_room_by_id_route},
+	kick::kick_user_route,
+	knock::knock_room_route,
+	leave::leave_room_route,
+	members::{get_member_events_route, joined_members_route},
+	unban::unban_user_route,
+};
+pub use self::{
+	join::join_room_by_id_helper,
+	leave::{leave_all_rooms, leave_room},
+};
+use crate::{Ruma, client::full_user_deactivate};
+
+/// # `POST /_matrix/client/r0/joined_rooms`
+///
+/// Lists all rooms the user has joined.
+pub(crate) async fn joined_rooms_route(
+	State(services): State<crate::State>,
+	body: Ruma<joined_rooms::v3::Request>,
+) -> Result<joined_rooms::v3::Response> {
+	Ok(joined_rooms::v3::Response {
+		joined_rooms: services
+			.rooms
+			.state_cache
+			.rooms_joined(body.sender_user())
+			.map(ToOwned::to_owned)
+			.collect()
+			.await,
+	})
+}
+
+/// Checks if the room is banned in any way possible and the sender user is not
+/// an admin.
+///
+/// Performs automatic deactivation if `auto_deactivate_banned_room_attempts` is
+/// enabled
+#[tracing::instrument(skip(services))]
+pub(crate) async fn banned_room_check(
+	services: &Services,
+	user_id: &UserId,
+	room_id: Option<&RoomId>,
+	server_name: Option<&ServerName>,
+	client_ip: IpAddr,
+) -> Result {
+	if services.users.is_admin(user_id).await {
+		return Ok(());
+	}
+
+	if let Some(room_id) = room_id {
+		if services.rooms.metadata.is_banned(room_id).await
+			|| services
+				.config
+				.forbidden_remote_server_names
+				.is_match(
+					room_id
+						.server_name()
+						.expect("legacy room mxid")
+						.host(),
+				) {
+			warn!(
+				"User {user_id} who is not an admin attempted to send an invite for or \
+				 attempted to join a banned room or banned room server name: {room_id}"
+			);
+
+			if services
+				.server
+				.config
+				.auto_deactivate_banned_room_attempts
+			{
+				warn!(
+					"Automatically deactivating user {user_id} due to attempted banned room join"
+				);
+
+				if services.server.config.admin_room_notices {
+					services
+						.admin
+						.send_text(&format!(
+							"Automatically deactivating user {user_id} due to attempted banned \
+							 room join from IP {client_ip}"
+						))
+						.await;
+				}
+
+				let all_joined_rooms: Vec<OwnedRoomId> = services
+					.rooms
+					.state_cache
+					.rooms_joined(user_id)
+					.map(Into::into)
+					.collect()
+					.await;
+
+				full_user_deactivate(services, user_id, &all_joined_rooms)
+					.boxed()
+					.await?;
+			}
+
+			return Err!(Request(Forbidden("This room is banned on this homeserver.")));
+		}
+	} else if let Some(server_name) = server_name {
+		if services
+			.config
+			.forbidden_remote_server_names
+			.is_match(server_name.host())
+		{
+			warn!(
+				"User {user_id} who is not an admin tried joining a room which has the server \
+				 name {server_name} that is globally forbidden. Rejecting.",
+			);
+
+			if services
+				.server
+				.config
+				.auto_deactivate_banned_room_attempts
+			{
+				warn!(
+					"Automatically deactivating user {user_id} due to attempted banned room join"
+				);
+
+				if services.server.config.admin_room_notices {
+					services
+						.admin
+						.send_text(&format!(
+							"Automatically deactivating user {user_id} due to attempted banned \
+							 room join from IP {client_ip}"
+						))
+						.await;
+				}
+
+				let all_joined_rooms: Vec<OwnedRoomId> = services
+					.rooms
+					.state_cache
+					.rooms_joined(user_id)
+					.map(Into::into)
+					.collect()
+					.await;
+
+				full_user_deactivate(services, user_id, &all_joined_rooms)
+					.boxed()
+					.await?;
+			}
+
+			return Err!(Request(Forbidden("This remote server is banned on this homeserver.")));
+		}
+	}
+
+	Ok(())
+}

src/api/client/membership/unban.rs

@@ -0,0 +1,59 @@
+use axum::extract::State;
+use ruma::{
+	api::client::membership::unban_user,
+	events::room::member::{MembershipState, RoomMemberEventContent},
+};
+use tuwunel_core::{Err, Result, matrix::pdu::PduBuilder};
+
+use crate::Ruma;
+
+/// # `POST /_matrix/client/r0/rooms/{roomId}/unban`
+///
+/// Tries to send an unban event into the room.
+pub(crate) async fn unban_user_route(
+	State(services): State<crate::State>,
+	body: Ruma<unban_user::v3::Request>,
+) -> Result<unban_user::v3::Response> {
+	let state_lock = services
+		.rooms
+		.state
+		.mutex
+		.lock(&body.room_id)
+		.await;
+
+	let current_member_content = services
+		.rooms
+		.state_accessor
+		.get_member(&body.room_id, &body.user_id)
+		.await
+		.unwrap_or_else(|_| RoomMemberEventContent::new(MembershipState::Leave));
+
+	if current_member_content.membership != MembershipState::Ban {
+		return Err!(Request(Forbidden(
+			"Cannot unban a user who is not banned (current membership: {})",
+			current_member_content.membership
+		)));
+	}
+
+	services
+		.rooms
+		.timeline
+		.build_and_append_pdu(
+			PduBuilder::state(body.user_id.to_string(), &RoomMemberEventContent {
+				membership: MembershipState::Leave,
+				reason: body.reason.clone(),
+				join_authorized_via_users_server: None,
+				third_party_invite: None,
+				is_direct: None,
+				..current_member_content
+			}),
+			body.sender_user(),
+			&body.room_id,
+			&state_lock,
+		)
+		.await?;
+
+	drop(state_lock);
+
+	Ok(unban_user::v3::Response::new())
+}