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//! Tell Mojang you're joining a multiplayer server.
use std::sync::LazyLock;
use reqwest::StatusCode;
use serde::Deserialize;
use serde_json::json;
use thiserror::Error;
use tracing::debug;
use uuid::Uuid;
use crate::game_profile::{GameProfile, SerializableGameProfile};
#[derive(Debug, Error)]
pub enum ClientSessionServerError {
#[error("Error sending HTTP request to sessionserver: {0}")]
HttpError(#[from] reqwest::Error),
#[error("Multiplayer is not enabled for this account")]
MultiplayerDisabled,
#[error("This account has been banned from multiplayer")]
Banned,
#[error("The authentication servers are currently not reachable")]
AuthServersUnreachable,
#[error("Invalid or expired session")]
InvalidSession,
#[error("Unknown sessionserver error: {0}")]
Unknown(String),
#[error("Forbidden operation (expired session?)")]
ForbiddenOperation,
#[error("RateLimiter disallowed request")]
RateLimited,
#[error("Unexpected response from sessionserver (status code {status_code}): {body}")]
UnexpectedResponse { status_code: u16, body: String },
}
#[derive(Debug, Error)]
pub enum ServerSessionServerError {
#[error("Error sending HTTP request to sessionserver: {0}")]
HttpError(#[from] reqwest::Error),
#[error("Invalid or expired session")]
InvalidSession,
#[error("Unexpected response from sessionserver (status code {status_code}): {body}")]
UnexpectedResponse { status_code: u16, body: String },
#[error("Unknown sessionserver error: {0}")]
Unknown(String),
}
#[derive(Deserialize)]
pub struct ForbiddenError {
pub error: String,
pub path: String,
}
pub struct SessionServerJoinOpts<'a> {
pub access_token: &'a str,
/// Given to us by the
pub public_key: &'a [u8],
pub private_key: &'a [u8],
pub uuid: &'a Uuid,
/// This is given to us by the server, but it's typically an empty string.
pub server_id: &'a str,
pub proxy: Option<reqwest::Proxy>,
}
/// Tell Mojang's servers that you are going to join a multiplayer server,
/// which is required to join online-mode servers.
pub async fn join(opts: SessionServerJoinOpts<'_>) -> Result<(), ClientSessionServerError> {
let client = if let Some(proxy) = opts.proxy {
// reusing the client is too complicated if we're using proxies, so don't bother
reqwest::ClientBuilder::new().proxy(proxy).build()?
} else {
// no_proxy so we don't check reqwest's proxy env variables (because azalea
// doesn't handle them when connecting to servers anyways)
static REQWEST_CLIENT: LazyLock<reqwest::Client> =
LazyLock::new(|| reqwest::ClientBuilder::new().no_proxy().build().unwrap());
REQWEST_CLIENT.clone()
};
let server_hash = azalea_crypto::hex_digest(&azalea_crypto::digest_data(
opts.server_id.as_bytes(),
opts.public_key,
opts.private_key,
));
join_with_server_id_hash(&client, opts.access_token, opts.uuid, &server_hash).await
}
pub async fn join_with_server_id_hash(
client: &reqwest::Client,
access_token: &str,
uuid: &Uuid,
server_hash: &str,
) -> Result<(), ClientSessionServerError> {
let mut encode_buffer = Uuid::encode_buffer();
let undashed_uuid = uuid.simple().encode_lower(&mut encode_buffer);
let data = json!({
"accessToken": access_token,
"selectedProfile": undashed_uuid,
"serverId": server_hash
});
let res = client
.post("https://sessionserver.mojang.com/session/minecraft/join")
.json(&data)
.send()
.await?;
match res.status() {
StatusCode::NO_CONTENT => Ok(()),
StatusCode::FORBIDDEN => {
let forbidden = res.json::<ForbiddenError>().await?;
match forbidden.error.as_str() {
"InsufficientPrivilegesException" => {
Err(ClientSessionServerError::MultiplayerDisabled)
}
"UserBannedException" => Err(ClientSessionServerError::Banned),
"AuthenticationUnavailableException" => {
Err(ClientSessionServerError::AuthServersUnreachable)
}
"InvalidCredentialsException" => Err(ClientSessionServerError::InvalidSession),
"ForbiddenOperationException" => Err(ClientSessionServerError::ForbiddenOperation),
_ => Err(ClientSessionServerError::Unknown(forbidden.error)),
}
}
StatusCode::TOO_MANY_REQUESTS => Err(ClientSessionServerError::RateLimited),
status_code => {
// log the headers
debug!("Error headers: {:#?}", res.headers());
let body = res.text().await?;
Err(ClientSessionServerError::UnexpectedResponse {
status_code: status_code.as_u16(),
body,
})
}
}
}
/// Ask Mojang's servers if the player joining is authenticated.
/// Included in the reply is the player's skin and cape.
/// The IP field is optional and equivalent to enabling
/// 'prevent-proxy-connections' in server.properties
pub async fn serverside_auth(
username: &str,
public_key: &[u8],
private_key: &[u8; 16],
ip: Option<&str>,
) -> Result<GameProfile, ServerSessionServerError> {
let hash = azalea_crypto::hex_digest(&azalea_crypto::digest_data(
"".as_bytes(),
public_key,
private_key,
));
let url = reqwest::Url::parse_with_params(
"https://sessionserver.mojang.com/session/minecraft/hasJoined",
if let Some(ip) = ip {
vec![("username", username), ("serverId", &hash), ("ip", ip)]
} else {
vec![("username", username), ("serverId", &hash)]
},
)
.expect("URL should always be valid");
let res = reqwest::get(url).await?;
match res.status() {
StatusCode::OK => {}
StatusCode::NO_CONTENT => {
return Err(ServerSessionServerError::InvalidSession);
}
StatusCode::FORBIDDEN => {
return Err(ServerSessionServerError::Unknown(
res.json::<ForbiddenError>().await?.error,
));
}
status_code => {
// log the headers
debug!("Error headers: {:#?}", res.headers());
let body = res.text().await?;
return Err(ServerSessionServerError::UnexpectedResponse {
status_code: status_code.as_u16(),
body,
});
}
};
Ok(res.json::<SerializableGameProfile>().await?.into())
}
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