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|
use azalea_auth::sessionserver::ClientSessionServerError;
use azalea_protocol::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};
use super::{
connection::RawConnection,
packet::login::{ReceiveCustomQueryEvent, ReceiveHelloEvent, SendLoginPacketEvent},
};
use crate::Account;
/// 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(trigger: Trigger<ReceiveHelloEvent>, mut commands: Commands) {
let task_pool = IoTaskPool::get();
let account = trigger.account.clone();
let packet = trigger.packet.clone();
let player = trigger.target();
let task = task_pool.spawn(auth_with_account(account, packet));
commands.entity(player).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),
#[error("{0}")]
SessionServer(#[from] ClientSessionServerError),
#[error("Couldn't refresh access token: {0}")]
Auth(#[from] azalea_auth::AuthError),
}
pub async fn auth_with_account(
account: Account,
packet: ClientboundHello,
) -> 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;
let Some(access_token) = &account.access_token else {
// 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;
while let Err(err) = {
let access_token = access_token.lock().clone();
let uuid = &account
.uuid
.expect("Uuid must be present if access token is present.");
// this is necessary since reqwest usually depends on tokio and we're using
// `futures` here
async_compat::Compat::new(async {
azalea_auth::sessionserver::join(
&access_token,
&packet.public_key,
&private_key,
uuid,
&packet.server_id,
)
.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
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: EventReader<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,
},
));
}
}
|
