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lib.rs
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use anyhow::anyhow;
pub mod codec;
pub mod io;
pub mod packets;
use crate::codec::CompressionThreshold;
#[doc(inline)]
pub use codec::MinecraftCodec;
pub use io::Nbt;
pub use io::{Readable, VarInt, VarLong, Writeable};
use libcraft_items::InventorySlot;
#[doc(inline)]
pub use packets::{
client::{ClientHandshakePacket, ClientLoginPacket, ClientPlayPacket, ClientStatusPacket},
server::{ServerLoginPacket, ServerPlayPacket, ServerStatusPacket},
VariantOf,
};
pub type Slot = InventorySlot;
/// A protocol version.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum ProtocolVersion {
V1_16_2,
}
/// A protocol state.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum ProtocolState {
Handshake,
Status,
Login,
Play,
}
/// Reads an arbitrary packet sent by a client based on a dynamically-updated
/// protocol state. As opposed to `MinecraftCodec`, this struct does not type-encode
/// the current protocol state using generics.
///
/// This is a wrapper around a `MinecraftCodec` but more useful in certain sitations
/// (e.g. when writing a proxy.)
pub struct ClientPacketCodec {
state: ProtocolState,
codec: MinecraftCodec,
}
impl Default for ClientPacketCodec {
fn default() -> Self {
Self::new()
}
}
impl ClientPacketCodec {
pub fn new() -> Self {
Self {
state: ProtocolState::Handshake,
codec: MinecraftCodec::new(),
}
}
pub fn set_state(&mut self, state: ProtocolState) {
self.state = state
}
pub fn set_compression(&mut self, threshold: CompressionThreshold) {
self.codec.enable_compression(threshold)
}
/// Decodes a `ClientPacket` using the provided data.
pub fn decode(&mut self, data: &[u8]) -> anyhow::Result<Option<ClientPacket>> {
self.codec.accept(data);
match self.state {
ProtocolState::Handshake => self
.codec
.next_packet::<ClientHandshakePacket>()
.map(|opt| opt.map(ClientPacket::from)),
ProtocolState::Status => self
.codec
.next_packet::<ClientStatusPacket>()
.map(|opt| opt.map(ClientPacket::from)),
ProtocolState::Login => self
.codec
.next_packet::<ClientLoginPacket>()
.map(|opt| opt.map(ClientPacket::from)),
ProtocolState::Play => self
.codec
.next_packet::<ClientPlayPacket>()
.map(|opt| opt.map(ClientPacket::from)),
}
}
/// Encodes a `ClientPacket` into a buffer.
pub fn encode(&mut self, packet: &ClientPacket, buffer: &mut Vec<u8>) {
match packet {
ClientPacket::Handshake(packet) => self.codec.encode(packet, buffer).unwrap(),
ClientPacket::Status(packet) => self.codec.encode(packet, buffer).unwrap(),
ClientPacket::Login(packet) => self.codec.encode(packet, buffer).unwrap(),
ClientPacket::Play(packet) => self.codec.encode(packet, buffer).unwrap(),
}
}
}
/// Similar to `ClientPacketCodec` but for server-sent packets.
pub struct ServerPacketCodec {
state: ProtocolState,
codec: MinecraftCodec,
}
impl Default for ServerPacketCodec {
fn default() -> Self {
Self::new()
}
}
impl ServerPacketCodec {
pub fn new() -> Self {
Self {
state: ProtocolState::Handshake,
codec: MinecraftCodec::new(),
}
}
pub fn set_state(&mut self, state: ProtocolState) {
self.state = state
}
pub fn set_compression(&mut self, threshold: CompressionThreshold) {
self.codec.enable_compression(threshold)
}
/// Decodes a `ServerPacket` using the provided data.
pub fn decode(&mut self, data: &[u8]) -> anyhow::Result<Option<ServerPacket>> {
self.codec.accept(data);
match self.state {
ProtocolState::Handshake => Err(anyhow!("server sent data during handshake state")),
ProtocolState::Status => self
.codec
.next_packet::<ServerStatusPacket>()
.map(|opt| opt.map(ServerPacket::from)),
ProtocolState::Login => self
.codec
.next_packet::<ServerLoginPacket>()
.map(|opt| opt.map(ServerPacket::from)),
ProtocolState::Play => self
.codec
.next_packet::<ServerPlayPacket>()
.map(|opt| opt.map(ServerPacket::from)),
}
}
/// Encodes a `ServerPacket` into a buffer.
pub fn encode(&mut self, packet: &ServerPacket, buffer: &mut Vec<u8>) {
match packet {
ServerPacket::Status(packet) => self.codec.encode(packet, buffer).unwrap(),
ServerPacket::Login(packet) => self.codec.encode(packet, buffer).unwrap(),
ServerPacket::Play(packet) => self.codec.encode(packet, buffer).unwrap(),
}
}
}
/// A packet sent by the client from any one of the packet stages.
#[derive(Debug, Clone)]
pub enum ClientPacket {
Handshake(ClientHandshakePacket),
Status(ClientStatusPacket),
Login(ClientLoginPacket),
Play(ClientPlayPacket),
}
impl ClientPacket {
pub fn id(&self) -> u32 {
match self {
ClientPacket::Handshake(packet) => packet.id(),
ClientPacket::Status(packet) => packet.id(),
ClientPacket::Login(packet) => packet.id(),
ClientPacket::Play(packet) => packet.id(),
}
}
}
impl From<ClientHandshakePacket> for ClientPacket {
fn from(packet: ClientHandshakePacket) -> Self {
ClientPacket::Handshake(packet)
}
}
impl From<ClientStatusPacket> for ClientPacket {
fn from(packet: ClientStatusPacket) -> Self {
ClientPacket::Status(packet)
}
}
impl From<ClientLoginPacket> for ClientPacket {
fn from(packet: ClientLoginPacket) -> Self {
ClientPacket::Login(packet)
}
}
impl From<ClientPlayPacket> for ClientPacket {
fn from(packet: ClientPlayPacket) -> Self {
ClientPacket::Play(packet)
}
}
/// A packet sent by the server from any one of the packet stages.
#[derive(Debug, Clone)]
pub enum ServerPacket {
Status(ServerStatusPacket),
Login(ServerLoginPacket),
Play(ServerPlayPacket),
}
impl ServerPacket {
pub fn id(&self) -> u32 {
match self {
ServerPacket::Status(packet) => packet.id(),
ServerPacket::Login(packet) => packet.id(),
ServerPacket::Play(packet) => packet.id(),
}
}
}
impl From<ServerStatusPacket> for ServerPacket {
fn from(packet: ServerStatusPacket) -> Self {
ServerPacket::Status(packet)
}
}
impl From<ServerLoginPacket> for ServerPacket {
fn from(packet: ServerLoginPacket) -> Self {
ServerPacket::Login(packet)
}
}
impl From<ServerPlayPacket> for ServerPacket {
fn from(packet: ServerPlayPacket) -> Self {
ServerPacket::Play(packet)
}
}