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|
#[cfg(feature = "online-mode")]
use azalea_auth::sessionserver::ClientSessionServerError;
use azalea_protocol::{
connect::Proxy,
packets::login::{ClientboundHello, ServerboundCustomQueryAnswer, ServerboundKey},
};
use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use bevy_tasks::{IoTaskPool, Task, futures_lite::future};
use thiserror::Error;
use tracing::{debug, error, trace, warn};
use super::{
connection::RawConnection,
packet::login::{ReceiveCustomQueryEvent, ReceiveHelloEvent, SendLoginPacketEvent},
};
use crate::{account::Account, join::ConnectOpts};
/// Some systems that run during the `login` state.
pub struct LoginPlugin;
impl Plugin for LoginPlugin {
fn build(&self, app: &mut App) {
app.add_observer(handle_receive_hello_event)
.add_systems(Update, (poll_auth_task, reply_to_custom_queries));
}
}
fn handle_receive_hello_event(
receive_hello: On<ReceiveHelloEvent>,
mut commands: Commands,
query: Query<&ConnectOpts>,
) {
let task_pool = IoTaskPool::get();
let account = receive_hello.account.clone();
let packet = receive_hello.packet.clone();
let client = receive_hello.entity;
// we store the auth proxy in the ConnectOpts component to make it easily
// configurable. that component should've definitely been inserted by now, but
// if it somehow wasn't then we should let the user know.
let connect_opts = if let Ok(opts) = query.get(client) {
opts.sessionserver_proxy.clone()
} else {
warn!("ConnectOpts component missing on a client ({client}) that got ReceiveHelloEvent");
None
};
let task = task_pool.spawn(async { auth_with_account(account, packet, connect_opts).await });
commands.entity(client).insert(AuthTask(task));
}
/// A marker component on our clients that indicates that the server is
/// online-mode and the client has authenticated their join with Mojang.
#[derive(Component)]
pub struct IsAuthenticated;
pub fn poll_auth_task(
mut commands: Commands,
mut query: Query<(Entity, &mut AuthTask, &mut RawConnection)>,
) {
for (entity, mut auth_task, mut raw_conn) in query.iter_mut() {
if let Some(poll_res) = future::block_on(future::poll_once(&mut auth_task.0)) {
debug!("Finished auth");
commands
.entity(entity)
.remove::<AuthTask>()
.insert(IsAuthenticated);
match poll_res {
Ok((packet, private_key)) => {
// we use this instead of SendLoginPacketEvent to ensure that it's sent right
// before encryption is enabled. i guess another option would be to make a
// Trigger+observer for set_encryption_key; the current implementation is
// simpler though.
if let Err(e) = raw_conn.write(packet) {
error!("Error sending key packet: {e:?}");
}
if let Some(net_conn) = raw_conn.net_conn() {
net_conn.set_encryption_key(private_key);
}
}
Err(err) => {
error!("Error during authentication: {err:?}");
}
}
}
}
}
type PrivateKey = [u8; 16];
#[derive(Component)]
pub struct AuthTask(Task<Result<(ServerboundKey, PrivateKey), AuthWithAccountError>>);
#[derive(Debug, Error)]
pub enum AuthWithAccountError {
#[error("Failed to encrypt the challenge from the server for {0:?}")]
Encryption(ClientboundHello),
#[cfg(feature = "online-mode")]
#[error("{0}")]
SessionServer(#[from] ClientSessionServerError),
#[cfg(feature = "online-mode")]
#[error("Couldn't refresh access token: {0}")]
Auth(#[from] azalea_auth::AuthError),
}
pub async fn auth_with_account(
account: Account,
packet: ClientboundHello,
proxy: Option<Proxy>,
) -> Result<(ServerboundKey, PrivateKey), AuthWithAccountError> {
let Ok(encrypt_res) = azalea_crypto::encrypt(&packet.public_key, &packet.challenge) else {
return Err(AuthWithAccountError::Encryption(packet));
};
let key_packet = ServerboundKey {
key_bytes: encrypt_res.encrypted_public_key,
encrypted_challenge: encrypt_res.encrypted_challenge,
};
let private_key = encrypt_res.secret_key;
#[cfg(not(feature = "online-mode"))]
let _ = (account, proxy);
#[cfg(feature = "online-mode")]
if packet.should_authenticate {
if account.access_token().is_none() {
// offline mode account, no need to do auth
return Ok((key_packet, private_key));
};
// keep track of the number of times we tried authenticating so we can give up
// after too many
let mut attempts: usize = 1;
let proxy = proxy.map(Proxy::into);
while let Err(err) = {
let proxy = proxy.clone();
// this is necessary since reqwest usually depends on tokio and we're using
// `futures` here
async_compat::Compat::new(async {
account
.join(&packet.public_key, &private_key, &packet.server_id, proxy)
.await
})
.await
} {
if attempts >= 2 {
// if this is the second attempt and we failed
// both times, give up
return Err(err.into());
}
if matches!(
err,
ClientSessionServerError::InvalidSession
| ClientSessionServerError::ForbiddenOperation
) {
// uh oh, we got an invalid session and have
// to reauthenticate now
async_compat::Compat::new(account.refresh()).await?;
} else {
return Err(err.into());
}
attempts += 1;
}
}
Ok((key_packet, private_key))
}
pub fn reply_to_custom_queries(
mut commands: Commands,
mut events: MessageReader<ReceiveCustomQueryEvent>,
) {
for event in events.read() {
trace!("Maybe replying to custom query: {event:?}");
if event.disabled {
continue;
}
commands.trigger(SendLoginPacketEvent::new(
event.entity,
ServerboundCustomQueryAnswer {
transaction_id: event.packet.transaction_id,
data: None,
},
));
}
}
|
