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conduit/src/server_server.rs
Timo Kösters c1953efa6b
chore: code cleanup
2021-04-14 10:43:31 +02:00

1733 lines
61 KiB
Rust
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use crate::{client_server, utils, ConduitResult, Database, Error, PduEvent, Result, Ruma};
use get_profile_information::v1::ProfileField;
use http::header::{HeaderValue, AUTHORIZATION, HOST};
use log::{debug, error, info, warn};
use regex::Regex;
use rocket::{response::content::Json, State};
use ruma::{
api::{
client::error::ErrorKind,
federation::{
directory::{get_public_rooms, get_public_rooms_filtered},
discovery::{
get_remote_server_keys, get_server_keys, get_server_version, ServerSigningKeys,
VerifyKey,
},
event::{get_event, get_missing_events, get_room_state_ids},
membership::create_invite,
query::get_profile_information,
transactions::send_transaction_message,
},
IncomingResponse, OutgoingRequest, OutgoingResponse,
},
directory::{IncomingFilter, IncomingRoomNetwork},
events::{
room::{create::CreateEventContent, member::MembershipState},
EventType,
},
serde::{to_canonical_value, Raw},
signatures::CanonicalJsonValue,
EventId, RoomId, RoomVersionId, ServerName, ServerSigningKeyId, UserId,
};
use state_res::{Event, EventMap, StateMap};
use std::{
collections::{btree_map::Entry, BTreeMap, BTreeSet, HashSet},
convert::TryFrom,
fmt::Debug,
future::Future,
net::{IpAddr, SocketAddr},
pin::Pin,
result::Result as StdResult,
sync::{Arc, RwLock},
time::{Duration, SystemTime},
};
#[cfg(feature = "conduit_bin")]
use rocket::{get, post, put};
#[tracing::instrument(skip(globals))]
pub async fn send_request<T: OutgoingRequest>(
globals: &crate::database::globals::Globals,
destination: &ServerName,
request: T,
) -> Result<T::IncomingResponse>
where
T: Debug,
{
if !globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let maybe_result = globals
.actual_destination_cache
.read()
.unwrap()
.get(destination)
.cloned();
let (actual_destination, host) = if let Some(result) = maybe_result {
result
} else {
let result = find_actual_destination(globals, &destination).await;
globals
.actual_destination_cache
.write()
.unwrap()
.insert(Box::<ServerName>::from(destination), result.clone());
result
};
let mut http_request = request
.try_into_http_request(&actual_destination, Some(""))
.map_err(|e| {
warn!("Failed to find destination {}: {}", actual_destination, e);
Error::BadServerResponse("Invalid destination")
})?;
let mut request_map = serde_json::Map::new();
if !http_request.body().is_empty() {
request_map.insert(
"content".to_owned(),
serde_json::from_slice(http_request.body())
.expect("body is valid json, we just created it"),
);
};
request_map.insert("method".to_owned(), T::METADATA.method.to_string().into());
request_map.insert(
"uri".to_owned(),
http_request
.uri()
.path_and_query()
.expect("all requests have a path")
.to_string()
.into(),
);
request_map.insert("origin".to_owned(), globals.server_name().as_str().into());
request_map.insert("destination".to_owned(), destination.as_str().into());
let mut request_json =
serde_json::from_value(request_map.into()).expect("valid JSON is valid BTreeMap");
ruma::signatures::sign_json(
globals.server_name().as_str(),
globals.keypair(),
&mut request_json,
)
.expect("our request json is what ruma expects");
let request_json: serde_json::Map<String, serde_json::Value> =
serde_json::from_slice(&serde_json::to_vec(&request_json).unwrap()).unwrap();
let signatures = request_json["signatures"]
.as_object()
.unwrap()
.values()
.map(|v| {
v.as_object()
.unwrap()
.iter()
.map(|(k, v)| (k, v.as_str().unwrap()))
});
for signature_server in signatures {
for s in signature_server {
http_request.headers_mut().insert(
AUTHORIZATION,
HeaderValue::from_str(&format!(
"X-Matrix origin={},key=\"{}\",sig=\"{}\"",
globals.server_name(),
s.0,
s.1
))
.unwrap(),
);
}
}
http_request
.headers_mut()
.insert(HOST, HeaderValue::from_str(&host).unwrap());
let mut reqwest_request = reqwest::Request::try_from(http_request)
.expect("all http requests are valid reqwest requests");
*reqwest_request.timeout_mut() = Some(Duration::from_secs(30));
let url = reqwest_request.url().clone();
let reqwest_response = globals.reqwest_client().execute(reqwest_request).await;
// Because reqwest::Response -> http::Response is complicated:
match reqwest_response {
Ok(mut reqwest_response) => {
let status = reqwest_response.status();
let mut http_response = http::Response::builder().status(status);
let headers = http_response.headers_mut().unwrap();
for (k, v) in reqwest_response.headers_mut().drain() {
if let Some(key) = k {
headers.insert(key, v);
}
}
let status = reqwest_response.status();
let body = reqwest_response.bytes().await.unwrap_or_else(|e| {
warn!("server error {}", e);
Vec::new().into()
}); // TODO: handle timeout
if status != 200 {
info!(
"{} {}: {}",
url,
status,
String::from_utf8_lossy(&body)
.lines()
.collect::<Vec<_>>()
.join(" ")
);
}
let response = T::IncomingResponse::try_from_http_response(
http_response
.body(body)
.expect("reqwest body is valid http body"),
);
response.map_err(|_| Error::BadServerResponse("Server returned bad response."))
}
Err(e) => Err(e.into()),
}
}
#[tracing::instrument]
fn get_ip_with_port(destination_str: String) -> Option<String> {
if destination_str.parse::<SocketAddr>().is_ok() {
Some(destination_str)
} else if let Ok(ip_addr) = destination_str.parse::<IpAddr>() {
Some(SocketAddr::new(ip_addr, 8448).to_string())
} else {
None
}
}
#[tracing::instrument]
fn add_port_to_hostname(destination_str: String) -> String {
match destination_str.find(':') {
None => destination_str.to_owned() + ":8448",
Some(_) => destination_str.to_string(),
}
}
/// Returns: actual_destination, host header
/// Implemented according to the specification at https://matrix.org/docs/spec/server_server/r0.1.4#resolving-server-names
/// Numbers in comments below refer to bullet points in linked section of specification
#[tracing::instrument(skip(globals))]
async fn find_actual_destination(
globals: &crate::database::globals::Globals,
destination: &'_ ServerName,
) -> (String, String) {
let destination_str = destination.as_str().to_owned();
let mut host = destination_str.clone();
let actual_destination = "https://".to_owned()
+ &match get_ip_with_port(destination_str.clone()) {
Some(host_port) => {
// 1: IP literal with provided or default port
host_port
}
None => {
if destination_str.find(':').is_some() {
// 2: Hostname with included port
destination_str
} else {
match request_well_known(globals, &destination.as_str()).await {
// 3: A .well-known file is available
Some(delegated_hostname) => {
host = delegated_hostname.clone();
match get_ip_with_port(delegated_hostname.clone()) {
Some(host_and_port) => host_and_port, // 3.1: IP literal in .well-known file
None => {
if destination_str.find(':').is_some() {
// 3.2: Hostname with port in .well-known file
destination_str
} else {
match query_srv_record(globals, &delegated_hostname).await {
// 3.3: SRV lookup successful
Some(hostname) => hostname,
// 3.4: No SRV records, just use the hostname from .well-known
None => add_port_to_hostname(delegated_hostname),
}
}
}
}
}
// 4: No .well-known or an error occured
None => {
match query_srv_record(globals, &destination_str).await {
// 4: SRV record found
Some(hostname) => hostname,
// 5: No SRV record found
None => add_port_to_hostname(destination_str.to_string()),
}
}
}
}
}
};
(actual_destination, host)
}
#[tracing::instrument(skip(globals))]
async fn query_srv_record(
globals: &crate::database::globals::Globals,
hostname: &'_ str,
) -> Option<String> {
if let Ok(Some(host_port)) = globals
.dns_resolver()
.srv_lookup(format!("_matrix._tcp.{}", hostname))
.await
.map(|srv| {
srv.iter().next().map(|result| {
format!(
"{}:{}",
result.target().to_string().trim_end_matches('.'),
result.port().to_string()
)
})
})
{
Some(host_port)
} else {
None
}
}
#[tracing::instrument(skip(globals))]
pub async fn request_well_known(
globals: &crate::database::globals::Globals,
destination: &str,
) -> Option<String> {
let body: serde_json::Value = serde_json::from_str(
&globals
.reqwest_client()
.get(&format!(
"https://{}/.well-known/matrix/server",
destination
))
.send()
.await
.ok()?
.text()
.await
.ok()?,
)
.ok()?;
Some(body.get("m.server")?.as_str()?.to_owned())
}
#[cfg_attr(feature = "conduit_bin", get("/_matrix/federation/v1/version"))]
#[tracing::instrument(skip(db))]
pub fn get_server_version_route(
db: State<'_, Database>,
) -> ConduitResult<get_server_version::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
Ok(get_server_version::v1::Response {
server: Some(get_server_version::v1::Server {
name: Some("Conduit".to_owned()),
version: Some(env!("CARGO_PKG_VERSION").to_owned()),
}),
}
.into())
}
// Response type for this endpoint is Json because we need to calculate a signature for the response
#[cfg_attr(feature = "conduit_bin", get("/_matrix/key/v2/server"))]
#[tracing::instrument(skip(db))]
pub fn get_server_keys_route(db: State<'_, Database>) -> Json<String> {
if !db.globals.allow_federation() {
// TODO: Use proper types
return Json("Federation is disabled.".to_owned());
}
let mut verify_keys = BTreeMap::new();
verify_keys.insert(
ServerSigningKeyId::try_from(
format!("ed25519:{}", db.globals.keypair().version()).as_str(),
)
.expect("found invalid server signing keys in DB"),
VerifyKey {
key: base64::encode_config(db.globals.keypair().public_key(), base64::STANDARD_NO_PAD),
},
);
let mut response = serde_json::from_slice(
get_server_keys::v2::Response {
server_key: ServerSigningKeys {
server_name: db.globals.server_name().to_owned(),
verify_keys,
old_verify_keys: BTreeMap::new(),
signatures: BTreeMap::new(),
valid_until_ts: SystemTime::now() + Duration::from_secs(60 * 2),
},
}
.try_into_http_response()
.unwrap()
.body(),
)
.unwrap();
ruma::signatures::sign_json(
db.globals.server_name().as_str(),
db.globals.keypair(),
&mut response,
)
.unwrap();
Json(ruma::serde::to_canonical_json_string(&response).expect("JSON is canonical"))
}
#[cfg_attr(feature = "conduit_bin", get("/_matrix/key/v2/server/<_>"))]
#[tracing::instrument(skip(db))]
pub fn get_server_keys_deprecated_route(db: State<'_, Database>) -> Json<String> {
get_server_keys_route(db)
}
#[cfg_attr(
feature = "conduit_bin",
post("/_matrix/federation/v1/publicRooms", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub async fn get_public_rooms_filtered_route(
db: State<'_, Database>,
body: Ruma<get_public_rooms_filtered::v1::Request<'_>>,
) -> ConduitResult<get_public_rooms_filtered::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let response = client_server::get_public_rooms_filtered_helper(
&db,
None,
body.limit,
body.since.as_deref(),
&body.filter,
&body.room_network,
)
.await?
.0;
Ok(get_public_rooms_filtered::v1::Response {
chunk: response
.chunk
.into_iter()
.map(|c| {
// Convert ruma::api::federation::directory::get_public_rooms::v1::PublicRoomsChunk
// to ruma::api::client::r0::directory::PublicRoomsChunk
Ok::<_, Error>(
serde_json::from_str(
&serde_json::to_string(&c)
.expect("PublicRoomsChunk::to_string always works"),
)
.expect("federation and client-server PublicRoomsChunk are the same type"),
)
})
.filter_map(|r| r.ok())
.collect(),
prev_batch: response.prev_batch,
next_batch: response.next_batch,
total_room_count_estimate: response.total_room_count_estimate,
}
.into())
}
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/federation/v1/publicRooms", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub async fn get_public_rooms_route(
db: State<'_, Database>,
body: Ruma<get_public_rooms::v1::Request<'_>>,
) -> ConduitResult<get_public_rooms::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let response = client_server::get_public_rooms_filtered_helper(
&db,
None,
body.limit,
body.since.as_deref(),
&IncomingFilter::default(),
&IncomingRoomNetwork::Matrix,
)
.await?
.0;
Ok(get_public_rooms::v1::Response {
chunk: response
.chunk
.into_iter()
.map(|c| {
// Convert ruma::api::federation::directory::get_public_rooms::v1::PublicRoomsChunk
// to ruma::api::client::r0::directory::PublicRoomsChunk
Ok::<_, Error>(
serde_json::from_str(
&serde_json::to_string(&c)
.expect("PublicRoomsChunk::to_string always works"),
)
.expect("federation and client-server PublicRoomsChunk are the same type"),
)
})
.filter_map(|r| r.ok())
.collect(),
prev_batch: response.prev_batch,
next_batch: response.next_batch,
total_room_count_estimate: response.total_room_count_estimate,
}
.into())
}
#[cfg_attr(
feature = "conduit_bin",
put("/_matrix/federation/v1/send/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub async fn send_transaction_message_route<'a>(
db: State<'a, Database>,
body: Ruma<send_transaction_message::v1::Request<'_>>,
) -> ConduitResult<send_transaction_message::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
for edu in &body.edus {
match serde_json::from_str::<send_transaction_message::v1::Edu>(edu.json().get()) {
Ok(edu) => match edu.edu_type.as_str() {
"m.typing" => {
if let Some(typing) = edu.content.get("typing") {
if typing.as_bool().unwrap_or_default() {
db.rooms.edus.typing_add(
&UserId::try_from(edu.content["user_id"].as_str().unwrap())
.unwrap(),
&RoomId::try_from(edu.content["room_id"].as_str().unwrap())
.unwrap(),
3000 + utils::millis_since_unix_epoch(),
&db.globals,
)?;
} else {
db.rooms.edus.typing_remove(
&UserId::try_from(edu.content["user_id"].as_str().unwrap())
.unwrap(),
&RoomId::try_from(edu.content["room_id"].as_str().unwrap())
.unwrap(),
&db.globals,
)?;
}
}
}
"m.presence" => {}
"m.receipt" => {}
"m.device_list_update" => {}
_ => {}
},
Err(_err) => {
continue;
}
}
}
let mut resolved_map = BTreeMap::new();
let pub_key_map = RwLock::new(BTreeMap::new());
// This is all the auth_events that have been recursively fetched so they don't have to be
// deserialized over and over again.
// TODO: make this persist across requests but not in a DB Tree (in globals?)
// TODO: This could potentially also be some sort of trie (suffix tree) like structure so
// that once an auth event is known it would know (using indexes maybe) all of the auth
// events that it references.
let mut auth_cache = EventMap::new();
for pdu in &body.pdus {
// We do not add the event_id field to the pdu here because of signature and hashes checks
let (event_id, value) = match crate::pdu::gen_event_id_canonical_json(pdu) {
Ok(t) => t,
Err(_) => {
// Event could not be converted to canonical json
continue;
}
};
if let Err(e) = handle_incoming_pdu(
&body.origin,
&event_id,
value,
true,
&db,
&pub_key_map,
&mut auth_cache,
)
.await
{
resolved_map.insert(event_id, Err(e));
}
}
for pdu in &resolved_map {
if let Err(e) = pdu.1 {
if e != "Room is unknown to this server." {
warn!("Incoming PDU failed {:?}", pdu);
}
}
}
Ok(send_transaction_message::v1::Response { pdus: resolved_map }.into())
}
/// An async function that can recursively calls itself.
type AsyncRecursiveResult<'a, T> = Pin<Box<dyn Future<Output = StdResult<T, String>> + 'a + Send>>;
/// When receiving an event one needs to:
/// 0. Skip the PDU if we already know about it
/// 1. Check the server is in the room
/// 2. Check signatures, otherwise drop
/// 3. Check content hash, redact if doesn't match
/// 4. Fetch any missing auth events doing all checks listed here starting at 1. These are not
/// timeline events
/// 5. Reject "due to auth events" if can't get all the auth events or some of the auth events are
/// also rejected "due to auth events"
/// 6. Reject "due to auth events" if the event doesn't pass auth based on the auth events
/// 7. Persist this event as an outlier
/// 8. If not timeline event: stop
/// 9. Fetch any missing prev events doing all checks listed here starting at 1. These are timeline
/// events
/// 10. Fetch missing state and auth chain events by calling /state_ids at backwards extremities
/// doing all the checks in this list starting at 1. These are not timeline events
/// 11. Check the auth of the event passes based on the state of the event
/// 12. Ensure that the state is derived from the previous current state (i.e. we calculated by
/// doing state res where one of the inputs was a previously trusted set of state, don't just
/// trust a set of state we got from a remote)
/// 13. Check if the event passes auth based on the "current state" of the room, if not "soft fail"
/// it
/// 14. Use state resolution to find new room state
// We use some AsyncRecursiveResult hacks here so we can call this async funtion recursively
fn handle_incoming_pdu<'a>(
origin: &'a ServerName,
event_id: &'a EventId,
value: BTreeMap<String, CanonicalJsonValue>,
is_timeline_event: bool,
db: &'a Database,
pub_key_map: &'a RwLock<BTreeMap<String, BTreeMap<String, String>>>,
auth_cache: &'a mut EventMap<Arc<PduEvent>>,
) -> AsyncRecursiveResult<'a, Arc<PduEvent>> {
Box::pin(async move {
// TODO: For RoomVersion6 we must check that Raw<..> is canonical do we anywhere?: https://matrix.org/docs/spec/rooms/v6#canonical-json
// 0. Skip the PDU if we already know about it
if let Ok(Some(pdu)) = db.rooms.get_non_outlier_pdu(&event_id) {
return Ok(Arc::new(pdu));
}
// 1. Check the server is in the room
let room_id = match value
.get("room_id")
.map(|id| match id {
CanonicalJsonValue::String(id) => RoomId::try_from(id.as_str()).ok(),
_ => None,
})
.flatten()
{
Some(id) => id,
None => {
// Event is invalid
return Err("Event needs a valid RoomId.".to_string());
}
};
match db.rooms.exists(&room_id) {
Ok(true) => {}
_ => {
return Err("Room is unknown to this server.".to_string());
}
}
// We go through all the signatures we see on the value and fetch the corresponding signing
// keys
fetch_required_signing_keys(&value, &pub_key_map, db)
.await
.map_err(|e| e.to_string())?;
// 2. Check signatures, otherwise drop
// 3. check content hash, redact if doesn't match
let create_event = db
.rooms
.room_state_get(&room_id, &EventType::RoomCreate, "")
.map_err(|_| "Failed to ask database for event.".to_owned())?
.ok_or_else(|| "Failed to find create event in db.".to_owned())?;
let create_event_content =
serde_json::from_value::<Raw<CreateEventContent>>(create_event.content.clone())
.expect("Raw::from_value always works.")
.deserialize()
.map_err(|_| "Invalid PowerLevels event in db.".to_owned())?;
let room_version = create_event_content.room_version;
let mut val = match ruma::signatures::verify_event(
&*pub_key_map.read().map_err(|_| "RwLock is poisoned.")?,
&value,
&room_version,
) {
Err(e) => {
// Drop
warn!("{:?}: {}", value, e);
return Err("Signature verification failed".to_string());
}
Ok(ruma::signatures::Verified::Signatures) => {
// Redact
match ruma::signatures::redact(&value, &room_version) {
Ok(obj) => obj,
Err(_) => return Err("Redaction failed".to_string()),
}
}
Ok(ruma::signatures::Verified::All) => value,
};
// Now that we have checked the signature and hashes we can add the eventID and convert
// to our PduEvent type
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id).expect("EventId is a valid CanonicalJsonValue"),
);
let incoming_pdu = serde_json::from_value::<PduEvent>(
serde_json::to_value(val).expect("CanonicalJsonObj is a valid JsonValue"),
)
.map_err(|_| "Event is not a valid PDU.".to_string())?;
// 4. fetch any missing auth events doing all checks listed here starting at 1. These are not timeline events
// 5. Reject "due to auth events" if can't get all the auth events or some of the auth events are also rejected "due to auth events"
debug!("Fetching auth events for {}", incoming_pdu.event_id);
fetch_and_handle_events(
db,
origin,
&incoming_pdu.auth_events,
pub_key_map,
auth_cache,
)
.await
.map_err(|e| e.to_string())?;
// 6. Reject "due to auth events" if the event doesn't pass auth based on the auth events
debug!(
"Auth check for {} based on auth events",
incoming_pdu.event_id
);
// Build map of auth events
let mut auth_events = BTreeMap::new();
for id in &incoming_pdu.auth_events {
let auth_event = auth_cache.get(id).ok_or_else(|| {
"Auth event not found, event failed recursive auth checks.".to_string()
})?;
match auth_events.entry((
auth_event.kind.clone(),
auth_event
.state_key
.clone()
.expect("all auth events have state keys"),
)) {
Entry::Vacant(v) => {
v.insert(auth_event.clone());
}
Entry::Occupied(_) => {
return Err(
"Auth event's type and state_key combination exists multiple times."
.to_owned(),
)
}
}
}
// The original create event must be in the auth events
if auth_events
.get(&(EventType::RoomCreate, "".to_owned()))
.map(|a| a.as_ref())
!= Some(&create_event)
{
return Err("Incoming event refers to wrong create event.".to_owned());
}
// If the previous event was the create event special rules apply
let previous_create = if incoming_pdu.auth_events.len() == 1
&& incoming_pdu.prev_events == incoming_pdu.auth_events
{
auth_cache
.get(&incoming_pdu.auth_events[0])
.cloned()
.filter(|maybe_create| **maybe_create == create_event)
} else {
None
};
let incoming_pdu = Arc::new(incoming_pdu.clone());
if !state_res::event_auth::auth_check(
&room_version,
&incoming_pdu,
previous_create.clone(),
&auth_events,
None, // TODO: third party invite
)
.map_err(|_e| "Auth check failed".to_string())?
{
return Err("Event has failed auth check with auth events.".to_string());
}
debug!("Validation successful.");
// 7. Persist the event as an outlier.
db.rooms
.add_pdu_outlier(&incoming_pdu)
.map_err(|_| "Failed to add pdu as outlier.".to_owned())?;
debug!("Added pdu as outlier.");
// 8. if not timeline event: stop
if !is_timeline_event {
return Ok(incoming_pdu);
}
// TODO: 9. fetch any missing prev events doing all checks listed here starting at 1. These are timeline events
// 10. Fetch missing state and auth chain events by calling /state_ids at backwards extremities
// doing all the checks in this list starting at 1. These are not timeline events.
// TODO: if we know the prev_events of the incoming event we can avoid the request and build
// the state from a known point and resolve if > 1 prev_event
debug!("Requesting state at event.");
let (state_at_incoming_event, incoming_auth_events): (StateMap<Arc<PduEvent>>, Vec<Arc<PduEvent>>) =
// Call /state_ids to find out what the state at this pdu is. We trust the server's
// response to some extend, but we still do a lot of checks on the events
match db
.sending
.send_federation_request(
&db.globals,
origin,
get_room_state_ids::v1::Request {
room_id: &room_id,
event_id: &incoming_pdu.event_id,
},
)
.await
{
Ok(res) => {
debug!("Fetching state events at event.");
let state_vec = match fetch_and_handle_events(
&db,
origin,
&res.pdu_ids,
pub_key_map,
auth_cache,
)
.await
{
Ok(state) => state,
Err(_) => return Err("Failed to fetch state events.".to_owned()),
};
let mut state = BTreeMap::new();
for pdu in state_vec {
match state.entry((pdu.kind.clone(), pdu.state_key.clone().ok_or_else(|| "Found non-state pdu in state events.".to_owned())?)) {
Entry::Vacant(v) => {
v.insert(pdu);
}
Entry::Occupied(_) => {
return Err(
"State event's type and state_key combination exists multiple times.".to_owned(),
)
}
}
}
// The original create event must still be in the state
if state.get(&(EventType::RoomCreate, "".to_owned())).map(|a| a.as_ref()) != Some(&create_event) {
return Err("Incoming event refers to wrong create event.".to_owned());
}
debug!("Fetching auth chain events at event.");
let incoming_auth_events = match fetch_and_handle_events(
&db,
origin,
&res.auth_chain_ids,
pub_key_map,
auth_cache,
)
.await
{
Ok(state) => state,
Err(_) => return Err("Failed to fetch auth chain.".to_owned()),
};
(state, incoming_auth_events)
}
Err(_) => {
return Err("Fetching state for event failed".into());
}
};
// 11. Check the auth of the event passes based on the state of the event
if !state_res::event_auth::auth_check(
&room_version,
&incoming_pdu,
previous_create.clone(),
&state_at_incoming_event,
None, // TODO: third party invite
)
.map_err(|_e| "Auth check failed.".to_owned())?
{
return Err("Event has failed auth check with state at the event.".into());
}
debug!("Auth check succeeded.");
// 13. Check if the event passes auth based on the "current state" of the room, if not "soft fail" it
let current_state = db
.rooms
.room_state_full(&room_id)
.map_err(|_| "Failed to load room state.".to_owned())?
.into_iter()
.map(|(k, v)| (k, Arc::new(v)))
.collect();
if !state_res::event_auth::auth_check(
&room_version,
&incoming_pdu,
previous_create,
&current_state,
None,
)
.map_err(|_e| "Auth check failed.".to_owned())?
{
// Soft fail, we leave the event as an outlier but don't add it to the timeline
return Err("Event has been soft failed".into());
};
debug!("Auth check with current state succeeded.");
// Now we calculate the set of extremities this room has after the incoming event has been
// applied. We start with the previous extremities (aka leaves)
let mut extremities = db
.rooms
.get_pdu_leaves(&room_id)
.map_err(|_| "Failed to load room leaves".to_owned())?;
// Remove any forward extremities that are referenced by this incoming event's prev_events
for prev_event in &incoming_pdu.prev_events {
if extremities.contains(prev_event) {
extremities.remove(prev_event);
}
}
let mut fork_states = BTreeSet::new();
for id in &extremities {
match db
.rooms
.get_pdu(&id)
.map_err(|_| "Failed to ask db for pdu.".to_owned())?
{
Some(leaf_pdu) => {
let pdu_shortstatehash = db
.rooms
.pdu_shortstatehash(&leaf_pdu.event_id)
.map_err(|_| "Failed to ask db for pdu state hash.".to_owned())?
.ok_or_else(|| {
error!(
"Found extremity pdu with no statehash in db: {:?}",
leaf_pdu
);
"Found pdu with no statehash in db.".to_owned()
})?;
let mut leaf_state = db
.rooms
.state_full(pdu_shortstatehash)
.map_err(|_| "Failed to ask db for room state.".to_owned())?
.into_iter()
.map(|(k, v)| (k, Arc::new(v)))
.collect::<StateMap<_>>();
if let Some(state_key) = &leaf_pdu.state_key {
// Now it's the state after
let key = (leaf_pdu.kind.clone(), state_key.clone());
leaf_state.insert(key, Arc::new(leaf_pdu));
}
fork_states.insert(leaf_state);
}
_ => {
error!("Missing state snapshot for {:?}", id);
return Err("Missing state snapshot.".to_owned());
}
}
}
// 12. Ensure that the state is derived from the previous current state (i.e. we calculated
// by doing state res where one of the inputs was a previously trusted set of state,
// don't just trust a set of state we got from a remote).
// We do this by adding the current state to the list of fork states
fork_states.insert(current_state);
// We also add state after incoming event to the fork states
extremities.insert(incoming_pdu.event_id.clone());
let mut state_after = state_at_incoming_event.clone();
if let Some(state_key) = &incoming_pdu.state_key {
state_after.insert(
(incoming_pdu.kind.clone(), state_key.clone()),
incoming_pdu.clone(),
);
}
fork_states.insert(state_after.clone());
let fork_states = fork_states.into_iter().collect::<Vec<_>>();
let mut update_state = false;
// 14. Use state resolution to find new room state
let new_room_state = if fork_states.is_empty() {
return Err("State is empty.".to_owned());
} else if fork_states.len() == 1 {
// There was only one state, so it has to be the room's current state (because that is
// always included)
debug!("Skipping stateres because there is no new state.");
fork_states[0]
.iter()
.map(|(k, pdu)| (k.clone(), pdu.event_id.clone()))
.collect()
} else {
// We do need to force an update to this room's state
update_state = true;
let mut auth_events = vec![];
for map in &fork_states {
let mut state_auth = vec![];
for auth_id in map.values().flat_map(|pdu| &pdu.auth_events) {
match fetch_and_handle_events(
&db,
origin,
&[auth_id.clone()],
pub_key_map,
auth_cache,
)
.await
{
// This should always contain exactly one element when Ok
Ok(events) => state_auth.push(events[0].clone()),
Err(e) => {
debug!("Event was not present: {}", e);
}
}
}
auth_events.push(state_auth);
}
// Add everything we will need to event_map
auth_cache.extend(
auth_events
.iter()
.map(|pdus| pdus.iter().map(|pdu| (pdu.event_id().clone(), pdu.clone())))
.flatten(),
);
auth_cache.extend(
incoming_auth_events
.into_iter()
.map(|pdu| (pdu.event_id().clone(), pdu)),
);
auth_cache.extend(
state_after
.into_iter()
.map(|(_, pdu)| (pdu.event_id().clone(), pdu)),
);
match state_res::StateResolution::resolve(
&room_id,
&room_version,
&fork_states
.into_iter()
.map(|map| {
map.into_iter()
.map(|(k, v)| (k, v.event_id.clone()))
.collect::<StateMap<_>>()
})
.collect::<Vec<_>>(),
auth_events
.into_iter()
.map(|pdus| pdus.into_iter().map(|pdu| pdu.event_id().clone()).collect())
.collect(),
auth_cache,
) {
Ok(new_state) => new_state,
Err(_) => {
return Err("State resolution failed, either an event could not be found or deserialization".into());
}
}
};
// Now that the event has passed all auth it is added into the timeline.
// We use the `state_at_event` instead of `state_after` so we accurately
// represent the state for this event.
append_incoming_pdu(&db, &incoming_pdu, extremities, &state_at_incoming_event)
.map_err(|_| "Failed to add pdu to db.".to_owned())?;
debug!("Appended incoming pdu.");
// Set the new room state to the resolved state
if update_state {
db.rooms
.force_state(&room_id, new_room_state, &db.globals)
.map_err(|_| "Failed to set new room state.".to_owned())?;
}
debug!("Updated resolved state");
// Event has passed all auth/stateres checks
Ok(incoming_pdu)
})
}
/// Find the event and auth it. Once the event is validated (steps 1 - 8)
/// it is appended to the outliers Tree.
///
/// a. Look in the auth_cache
/// b. Look in the main timeline (pduid_pdu tree)
/// c. Look at outlier pdu tree
/// d. Ask origin server over federation
/// e. TODO: Ask other servers over federation?
///
/// If the event is unknown to the `auth_cache` it is added. This guarantees that any
/// event we need to know of will be present.
//#[tracing::instrument(skip(db, key_map, auth_cache))]
pub(crate) async fn fetch_and_handle_events(
db: &Database,
origin: &ServerName,
events: &[EventId],
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, String>>>,
auth_cache: &mut EventMap<Arc<PduEvent>>,
) -> Result<Vec<Arc<PduEvent>>> {
let mut pdus = vec![];
for id in events {
// a. Look at auth cache
let pdu = match auth_cache.get(id) {
Some(pdu) => {
debug!("Found {} in cache", id);
pdu.clone()
}
// b. Look in the main timeline (pduid_pdu tree)
// c. Look at outlier pdu tree
// (get_pdu checks both)
None => match db.rooms.get_pdu(&id)? {
Some(pdu) => {
debug!("Found {} in outliers", id);
Arc::new(pdu)
}
None => {
// d. Ask origin server over federation
debug!("Fetching {} over federation.", id);
match db
.sending
.send_federation_request(
&db.globals,
origin,
get_event::v1::Request { event_id: &id },
)
.await
{
Ok(res) => {
debug!("Got {} over federation: {:?}", id, res);
let (event_id, value) =
crate::pdu::gen_event_id_canonical_json(&res.pdu)?;
let pdu = match handle_incoming_pdu(
origin,
&event_id,
value,
false,
db,
pub_key_map,
auth_cache,
)
.await
{
Ok(pdu) => pdu,
Err(e) => {
warn!("Authentication of event {} failed: {:?}", id, e);
continue;
}
};
pdu
}
Err(_) => {
warn!("Failed to fetch event: {}", id);
continue;
}
}
}
},
};
auth_cache.entry(id.clone()).or_insert_with(|| pdu.clone());
pdus.push(pdu);
}
Ok(pdus)
}
/// Search the DB for the signing keys of the given server, if we don't have them
/// fetch them from the server and save to our DB.
#[tracing::instrument(skip(db))]
pub(crate) async fn fetch_signing_keys(
db: &Database,
origin: &ServerName,
signature_ids: Vec<&String>,
) -> Result<BTreeMap<String, String>> {
let contains_all_ids =
|keys: &BTreeMap<String, String>| signature_ids.iter().all(|&id| keys.contains_key(id));
let mut result = db
.globals
.signing_keys_for(origin)?
.into_iter()
.map(|(k, v)| (k.to_string(), v.key))
.collect::<BTreeMap<_, _>>();
if contains_all_ids(&result) {
return Ok(result);
}
if let Ok(get_keys_response) = db
.sending
.send_federation_request(&db.globals, origin, get_server_keys::v2::Request::new())
.await
{
db.globals
.add_signing_key(origin, &get_keys_response.server_key)?;
result.extend(
get_keys_response
.server_key
.verify_keys
.into_iter()
.map(|(k, v)| (k.to_string(), v.key)),
);
result.extend(
get_keys_response
.server_key
.old_verify_keys
.into_iter()
.map(|(k, v)| (k.to_string(), v.key)),
);
if contains_all_ids(&result) {
return Ok(result);
}
}
for server in db.globals.trusted_servers() {
debug!("Asking {} for {}'s signing key", server, origin);
if let Ok(keys) = db
.sending
.send_federation_request(
&db.globals,
&server,
get_remote_server_keys::v2::Request::new(
origin,
SystemTime::now()
.checked_add(Duration::from_secs(3600))
.expect("SystemTime to large"),
),
)
.await
{
debug!("Got signing keys: {:?}", keys);
for k in keys.server_keys {
db.globals.add_signing_key(origin, &k)?;
result.extend(
k.verify_keys
.into_iter()
.map(|(k, v)| (k.to_string(), v.key)),
);
result.extend(
k.old_verify_keys
.into_iter()
.map(|(k, v)| (k.to_string(), v.key)),
);
}
if contains_all_ids(&result) {
return Ok(result);
}
}
}
warn!("Failed to find public key for server: {}", origin);
Err(Error::BadServerResponse(
"Failed to find public key for server",
))
}
/// Append the incoming event setting the state snapshot to the state from the
/// server that sent the event.
#[tracing::instrument(skip(db))]
pub(crate) fn append_incoming_pdu(
db: &Database,
pdu: &PduEvent,
new_room_leaves: HashSet<EventId>,
state: &StateMap<Arc<PduEvent>>,
) -> Result<()> {
let count = db.globals.next_count()?;
let mut pdu_id = pdu.room_id.as_bytes().to_vec();
pdu_id.push(0xff);
pdu_id.extend_from_slice(&count.to_be_bytes());
// We append to state before appending the pdu, so we don't have a moment in time with the
// pdu without it's state. This is okay because append_pdu can't fail.
db.rooms
.set_event_state(&pdu.event_id, state, &db.globals)?;
db.rooms.append_pdu(
pdu,
utils::to_canonical_object(pdu).expect("Pdu is valid canonical object"),
count,
pdu_id.clone().into(),
&new_room_leaves.into_iter().collect::<Vec<_>>(),
&db,
)?;
for appservice in db.appservice.iter_all().filter_map(|r| r.ok()) {
if let Some(namespaces) = appservice.1.get("namespaces") {
let users = namespaces
.get("users")
.and_then(|users| users.as_sequence())
.map_or_else(Vec::new, |users| {
users
.iter()
.map(|users| {
users
.get("regex")
.and_then(|regex| regex.as_str())
.and_then(|regex| Regex::new(regex).ok())
})
.filter_map(|o| o)
.collect::<Vec<_>>()
});
let aliases = namespaces
.get("aliases")
.and_then(|users| users.get("regex"))
.and_then(|regex| regex.as_str())
.and_then(|regex| Regex::new(regex).ok());
let rooms = namespaces
.get("rooms")
.and_then(|rooms| rooms.as_sequence());
let room_aliases = db.rooms.room_aliases(&pdu.room_id);
let bridge_user_id = appservice
.1
.get("sender_localpart")
.and_then(|string| string.as_str())
.and_then(|string| {
UserId::parse_with_server_name(string, db.globals.server_name()).ok()
});
#[allow(clippy::blocks_in_if_conditions)]
if bridge_user_id.map_or(false, |bridge_user_id| {
db.rooms
.is_joined(&bridge_user_id, &pdu.room_id)
.unwrap_or(false)
}) || users.iter().any(|users| {
users.is_match(pdu.sender.as_str())
|| pdu.kind == EventType::RoomMember
&& pdu
.state_key
.as_ref()
.map_or(false, |state_key| users.is_match(&state_key))
}) || aliases.map_or(false, |aliases| {
room_aliases
.filter_map(|r| r.ok())
.any(|room_alias| aliases.is_match(room_alias.as_str()))
}) || rooms.map_or(false, |rooms| rooms.contains(&pdu.room_id.as_str().into()))
|| db
.rooms
.room_members(&pdu.room_id)
.filter_map(|r| r.ok())
.any(|member| users.iter().any(|regex| regex.is_match(member.as_str())))
{
db.sending.send_pdu_appservice(&appservice.0, &pdu_id)?;
}
}
}
Ok(())
}
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/federation/v1/event/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub fn get_event_route<'a>(
db: State<'a, Database>,
body: Ruma<get_event::v1::Request<'_>>,
) -> ConduitResult<get_event::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
Ok(get_event::v1::Response {
origin: db.globals.server_name().to_owned(),
origin_server_ts: SystemTime::now(),
pdu: PduEvent::convert_to_outgoing_federation_event(
db.rooms
.get_pdu_json(&body.event_id)?
.ok_or(Error::BadRequest(ErrorKind::NotFound, "Event not found."))?,
),
}
.into())
}
#[cfg_attr(
feature = "conduit_bin",
post("/_matrix/federation/v1/get_missing_events/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub fn get_missing_events_route<'a>(
db: State<'a, Database>,
body: Ruma<get_missing_events::v1::Request<'_>>,
) -> ConduitResult<get_missing_events::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let mut queued_events = body.latest_events.clone();
let mut events = Vec::new();
let mut i = 0;
while i < queued_events.len() && events.len() < u64::from(body.limit) as usize {
if let Some(pdu) = db.rooms.get_pdu_json(&queued_events[i])? {
let event_id =
serde_json::from_value(
serde_json::to_value(pdu.get("event_id").cloned().ok_or_else(|| {
Error::bad_database("Event in db has no event_id field.")
})?)
.expect("canonical json is valid json value"),
)
.map_err(|_| Error::bad_database("Invalid event_id field in pdu in db."))?;
if body.earliest_events.contains(&event_id) {
i += 1;
continue;
}
queued_events.extend_from_slice(
&serde_json::from_value::<Vec<EventId>>(
serde_json::to_value(pdu.get("prev_events").cloned().ok_or_else(|| {
Error::bad_database("Event in db has no prev_events field.")
})?)
.expect("canonical json is valid json value"),
)
.map_err(|_| Error::bad_database("Invalid prev_events content in pdu in db."))?,
);
events.push(PduEvent::convert_to_outgoing_federation_event(pdu));
}
i += 1;
}
Ok(get_missing_events::v1::Response { events }.into())
}
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/federation/v1/state_ids/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub fn get_room_state_ids_route<'a>(
db: State<'a, Database>,
body: Ruma<get_room_state_ids::v1::Request<'_>>,
) -> ConduitResult<get_room_state_ids::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let shortstatehash = db
.rooms
.pdu_shortstatehash(&body.event_id)?
.ok_or(Error::BadRequest(
ErrorKind::NotFound,
"Pdu state not found.",
))?;
let pdu_ids = db.rooms.state_full_ids(shortstatehash)?;
let mut auth_chain_ids = BTreeSet::<EventId>::new();
let mut todo = BTreeSet::new();
todo.insert(body.event_id.clone());
while let Some(event_id) = todo.iter().next().cloned() {
if let Some(pdu) = db.rooms.get_pdu(&event_id)? {
todo.extend(
pdu.auth_events
.clone()
.into_iter()
.collect::<BTreeSet<_>>()
.difference(&auth_chain_ids)
.cloned(),
);
auth_chain_ids.extend(pdu.auth_events.into_iter());
} else {
warn!("Could not find pdu mentioned in auth events.");
}
todo.remove(&event_id);
}
Ok(get_room_state_ids::v1::Response {
auth_chain_ids: auth_chain_ids.into_iter().collect(),
pdu_ids,
}
.into())
}
#[cfg_attr(
feature = "conduit_bin",
put("/_matrix/federation/v2/invite/<_>/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub async fn create_invite_route<'a>(
db: State<'a, Database>,
body: Ruma<create_invite::v2::Request>,
) -> ConduitResult<create_invite::v2::Response> {
if body.room_version < RoomVersionId::Version6 {
return Err(Error::BadRequest(
ErrorKind::IncompatibleRoomVersion {
room_version: body.room_version.clone(),
},
"Server does not support this room version.",
));
}
let mut signed_event = utils::to_canonical_object(&body.event)
.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invite event is invalid."))?;
ruma::signatures::hash_and_sign_event(
db.globals.server_name().as_str(),
db.globals.keypair(),
&mut signed_event,
&body.room_version,
)
.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Failed to sign event."))?;
// Generate event id
let event_id = EventId::try_from(&*format!(
"${}",
ruma::signatures::reference_hash(&signed_event, &body.room_version)
.expect("ruma can calculate reference hashes")
))
.expect("ruma's reference hashes are valid event ids");
// Add event_id back
signed_event.insert(
"event_id".to_owned(),
to_canonical_value(&event_id).expect("EventId is a valid CanonicalJsonValue"),
);
let sender = serde_json::from_value(
serde_json::to_value(
signed_event
.get("sender")
.ok_or(Error::BadRequest(
ErrorKind::InvalidParam,
"Event had no sender field.",
))?
.clone(),
)
.expect("CanonicalJsonValue to serde_json::Value always works"),
)
.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "sender is not a user id."))?;
let invited_user = serde_json::from_value(
serde_json::to_value(
signed_event
.get("state_key")
.ok_or(Error::BadRequest(
ErrorKind::InvalidParam,
"Event had no state_key field.",
))?
.clone(),
)
.expect("CanonicalJsonValue to serde_json::Value always works"),
)
.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "state_key is not a user id."))?;
let mut invite_state = body.invite_room_state.clone();
let mut event = serde_json::from_str::<serde_json::Map<String, serde_json::Value>>(
&body.event.json().to_string(),
)
.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid invite event bytes."))?;
event.insert("event_id".to_owned(), "$dummy".into());
let pdu = serde_json::from_value::<PduEvent>(event.into()).map_err(|e| {
warn!("Invalid invite event: {}", e);
Error::BadRequest(ErrorKind::InvalidParam, "Invalid invite event.")
})?;
invite_state.push(pdu.to_stripped_state_event());
// If the room already exists, the remote server will notify us about the join via /send
if !db.rooms.exists(&pdu.room_id)? {
db.rooms.update_membership(
&body.room_id,
&invited_user,
MembershipState::Invite,
&sender,
Some(invite_state),
&db,
)?;
}
Ok(create_invite::v2::Response {
event: PduEvent::convert_to_outgoing_federation_event(signed_event),
}
.into())
}
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/federation/v1/query/profile", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub fn get_profile_information_route<'a>(
db: State<'a, Database>,
body: Ruma<get_profile_information::v1::Request<'_>>,
) -> ConduitResult<get_profile_information::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let mut displayname = None;
let mut avatar_url = None;
match &body.field {
// TODO: what to do with custom
Some(ProfileField::_Custom(_s)) => {}
Some(ProfileField::DisplayName) => displayname = db.users.displayname(&body.user_id)?,
Some(ProfileField::AvatarUrl) => avatar_url = db.users.avatar_url(&body.user_id)?,
None => {
displayname = db.users.displayname(&body.user_id)?;
avatar_url = db.users.avatar_url(&body.user_id)?;
}
}
Ok(get_profile_information::v1::Response {
displayname,
avatar_url,
}
.into())
}
pub async fn fetch_required_signing_keys(
event: &BTreeMap<String, CanonicalJsonValue>,
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, String>>>,
db: &Database,
) -> Result<()> {
// We go through all the signatures we see on the value and fetch the corresponding signing
// keys
for (signature_server, signature) in match event.get("signatures").ok_or(
Error::BadServerResponse("No signatures in server response pdu."),
)? {
CanonicalJsonValue::Object(map) => map,
_ => {
return Err(Error::BadServerResponse(
"Invalid signatures object in server response pdu.",
))
}
} {
let signature_object = match signature {
CanonicalJsonValue::Object(map) => map,
_ => {
return Err(Error::BadServerResponse(
"Invalid signatures content object in server response pdu.",
))
}
};
let signature_ids = signature_object.keys().collect::<Vec<_>>();
debug!("Fetching signing keys for {}", signature_server);
let keys = match fetch_signing_keys(
db,
&Box::<ServerName>::try_from(&**signature_server).map_err(|_| {
Error::BadServerResponse("Invalid servername in signatures of server response pdu.")
})?,
signature_ids,
)
.await
{
Ok(keys) => keys,
Err(_) => {
warn!("Signature verification failed: Could not fetch signing key.",);
continue;
}
};
pub_key_map
.write()
.map_err(|_| Error::bad_database("RwLock is poisoned."))?
.insert(signature_server.clone(), keys);
}
Ok(())
}
#[cfg(test)]
mod tests {
use super::{add_port_to_hostname, get_ip_with_port};
#[test]
fn ips_get_default_ports() {
assert_eq!(
get_ip_with_port(String::from("1.1.1.1")),
Some(String::from("1.1.1.1:8448"))
);
assert_eq!(
get_ip_with_port(String::from("dead:beef::")),
Some(String::from("[dead:beef::]:8448"))
);
}
#[test]
fn ips_keep_custom_ports() {
assert_eq!(
get_ip_with_port(String::from("1.1.1.1:1234")),
Some(String::from("1.1.1.1:1234"))
);
assert_eq!(
get_ip_with_port(String::from("[dead::beef]:8933")),
Some(String::from("[dead::beef]:8933"))
);
}
#[test]
fn hostnames_get_default_ports() {
assert_eq!(
add_port_to_hostname(String::from("example.com")),
"example.com:8448"
)
}
#[test]
fn hostnames_keep_custom_ports() {
assert_eq!(
add_port_to_hostname(String::from("example.com:1337")),
"example.com:1337"
)
}
}
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