mirror of
https://github.com/actix/actix-extras.git
synced 2024-11-25 08:22:43 +01:00
409 lines
14 KiB
Rust
409 lines
14 KiB
Rust
//! `WebSocket` support for Actix
|
|
//!
|
|
//! To setup a `WebSocket`, first do web socket handshake then on success convert `Payload`
|
|
//! into a `WsStream` stream and then use `WsWriter` to communicate with the peer.
|
|
//!
|
|
//! ## Example
|
|
//!
|
|
//! ```rust
|
|
//! extern crate actix;
|
|
//! extern crate actix_web;
|
|
//!
|
|
//! use actix::*;
|
|
//! use actix_web::*;
|
|
//!
|
|
//! // do websocket handshake and start actor
|
|
//! fn ws_index(req: HttpRequest) -> Result<Reply> {
|
|
//! ws::start(req, WsRoute)
|
|
//! }
|
|
//!
|
|
//! // WebSocket Route
|
|
//! struct WsRoute;
|
|
//!
|
|
//! impl Actor for WsRoute {
|
|
//! type Context = HttpContext<Self>;
|
|
//! }
|
|
//!
|
|
//! // Define Handler for ws::Message message
|
|
//! impl StreamHandler<ws::Message> for WsRoute {}
|
|
//!
|
|
//! impl Handler<ws::Message> for WsRoute {
|
|
//! fn handle(&mut self, msg: ws::Message, ctx: &mut HttpContext<Self>)
|
|
//! -> Response<Self, ws::Message>
|
|
//! {
|
|
//! match msg {
|
|
//! ws::Message::Ping(msg) => ws::WsWriter::pong(ctx, &msg),
|
|
//! ws::Message::Text(text) => ws::WsWriter::text(ctx, &text),
|
|
//! ws::Message::Binary(bin) => ws::WsWriter::binary(ctx, bin),
|
|
//! _ => (),
|
|
//! }
|
|
//! Self::empty()
|
|
//! }
|
|
//! }
|
|
//!
|
|
//! fn main() {
|
|
//! Application::new()
|
|
//! .resource("/ws/", |r| r.method(Method::GET).f(ws_index)) // <- register websocket route
|
|
//! .finish();
|
|
//! }
|
|
//! ```
|
|
use std::vec::Vec;
|
|
use http::{Method, StatusCode, header};
|
|
use bytes::BytesMut;
|
|
use futures::{Async, Poll, Stream};
|
|
|
|
use actix::{Actor, AsyncContext, ResponseType, StreamHandler};
|
|
|
|
use body::Body;
|
|
use context::HttpContext;
|
|
use handler::Reply;
|
|
use payload::ReadAny;
|
|
use error::{Error, WsHandshakeError};
|
|
use httprequest::HttpRequest;
|
|
use httpresponse::{ConnectionType, HttpResponse};
|
|
|
|
use wsframe;
|
|
use wsproto::*;
|
|
pub use wsproto::CloseCode;
|
|
|
|
const SEC_WEBSOCKET_ACCEPT: &str = "SEC-WEBSOCKET-ACCEPT";
|
|
const SEC_WEBSOCKET_KEY: &str = "SEC-WEBSOCKET-KEY";
|
|
const SEC_WEBSOCKET_VERSION: &str = "SEC-WEBSOCKET-VERSION";
|
|
// const SEC_WEBSOCKET_PROTOCOL: &'static str = "SEC-WEBSOCKET-PROTOCOL";
|
|
|
|
|
|
/// `WebSocket` Message
|
|
#[derive(Debug)]
|
|
pub enum Message {
|
|
Text(String),
|
|
Binary(Vec<u8>),
|
|
Ping(String),
|
|
Pong(String),
|
|
Close,
|
|
Closed,
|
|
Error
|
|
}
|
|
|
|
impl ResponseType for Message {
|
|
type Item = ();
|
|
type Error = ();
|
|
}
|
|
|
|
/// Do websocket handshake and start actor
|
|
pub fn start<A, S>(mut req: HttpRequest<S>, actor: A) -> Result<Reply, Error>
|
|
where A: Actor<Context=HttpContext<A, S>> + StreamHandler<Message>,
|
|
S: 'static
|
|
{
|
|
let resp = handshake(&req)?;
|
|
|
|
let stream = WsStream::new(req.payload_mut().readany());
|
|
let mut ctx = HttpContext::new(req, actor);
|
|
ctx.start(resp);
|
|
ctx.add_stream(stream);
|
|
Ok(ctx.into())
|
|
}
|
|
|
|
/// Prepare `WebSocket` handshake response.
|
|
///
|
|
/// This function returns handshake `HttpResponse`, ready to send to peer.
|
|
/// It does not perform any IO.
|
|
///
|
|
// /// `protocols` is a sequence of known protocols. On successful handshake,
|
|
// /// the returned response headers contain the first protocol in this list
|
|
// /// which the server also knows.
|
|
pub fn handshake<S>(req: &HttpRequest<S>) -> Result<HttpResponse, WsHandshakeError> {
|
|
// WebSocket accepts only GET
|
|
if *req.method() != Method::GET {
|
|
return Err(WsHandshakeError::GetMethodRequired)
|
|
}
|
|
|
|
// Check for "UPGRADE" to websocket header
|
|
let has_hdr = if let Some(hdr) = req.headers().get(header::UPGRADE) {
|
|
if let Ok(s) = hdr.to_str() {
|
|
s.to_lowercase().contains("websocket")
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
false
|
|
};
|
|
if !has_hdr {
|
|
return Err(WsHandshakeError::NoWebsocketUpgrade)
|
|
}
|
|
|
|
// Upgrade connection
|
|
if !req.upgrade() {
|
|
return Err(WsHandshakeError::NoConnectionUpgrade)
|
|
}
|
|
|
|
// check supported version
|
|
if !req.headers().contains_key(SEC_WEBSOCKET_VERSION) {
|
|
return Err(WsHandshakeError::NoVersionHeader)
|
|
}
|
|
let supported_ver = {
|
|
if let Some(hdr) = req.headers().get(SEC_WEBSOCKET_VERSION) {
|
|
hdr == "13" || hdr == "8" || hdr == "7"
|
|
} else {
|
|
false
|
|
}
|
|
};
|
|
if !supported_ver {
|
|
return Err(WsHandshakeError::UnsupportedVersion)
|
|
}
|
|
|
|
// check client handshake for validity
|
|
if !req.headers().contains_key(SEC_WEBSOCKET_KEY) {
|
|
return Err(WsHandshakeError::BadWebsocketKey)
|
|
}
|
|
let key = {
|
|
let key = req.headers().get(SEC_WEBSOCKET_KEY).unwrap();
|
|
hash_key(key.as_ref())
|
|
};
|
|
|
|
Ok(HttpResponse::build(StatusCode::SWITCHING_PROTOCOLS)
|
|
.connection_type(ConnectionType::Upgrade)
|
|
.header(header::UPGRADE, "websocket")
|
|
.header(header::TRANSFER_ENCODING, "chunked")
|
|
.header(SEC_WEBSOCKET_ACCEPT, key.as_str())
|
|
.body(Body::UpgradeContext).unwrap()
|
|
)
|
|
}
|
|
|
|
/// Maps `Payload` stream into stream of `ws::Message` items
|
|
pub struct WsStream {
|
|
rx: ReadAny,
|
|
buf: BytesMut,
|
|
closed: bool,
|
|
error_sent: bool,
|
|
}
|
|
|
|
impl WsStream {
|
|
pub fn new(payload: ReadAny) -> WsStream {
|
|
WsStream { rx: payload,
|
|
buf: BytesMut::new(),
|
|
closed: false,
|
|
error_sent: false }
|
|
}
|
|
}
|
|
|
|
impl Stream for WsStream {
|
|
type Item = Message;
|
|
type Error = ();
|
|
|
|
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
|
|
let mut done = false;
|
|
|
|
if !self.closed {
|
|
loop {
|
|
match self.rx.poll() {
|
|
Ok(Async::Ready(Some(chunk))) => {
|
|
self.buf.extend_from_slice(&chunk)
|
|
}
|
|
Ok(Async::Ready(None)) => {
|
|
done = true;
|
|
self.closed = true;
|
|
break;
|
|
}
|
|
Ok(Async::NotReady) => break,
|
|
Err(_) => {
|
|
self.closed = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
loop {
|
|
match wsframe::Frame::parse(&mut self.buf) {
|
|
Ok(Some(frame)) => {
|
|
// trace!("WsFrame {}", frame);
|
|
let (_finished, opcode, payload) = frame.unpack();
|
|
|
|
match opcode {
|
|
OpCode::Continue => continue,
|
|
OpCode::Bad =>
|
|
return Ok(Async::Ready(Some(Message::Error))),
|
|
OpCode::Close => {
|
|
self.closed = true;
|
|
self.error_sent = true;
|
|
return Ok(Async::Ready(Some(Message::Closed)))
|
|
},
|
|
OpCode::Ping =>
|
|
return Ok(Async::Ready(Some(
|
|
Message::Ping(String::from_utf8_lossy(&payload).into())))),
|
|
OpCode::Pong =>
|
|
return Ok(Async::Ready(Some(
|
|
Message::Pong(String::from_utf8_lossy(&payload).into())))),
|
|
OpCode::Binary =>
|
|
return Ok(Async::Ready(Some(Message::Binary(payload)))),
|
|
OpCode::Text => {
|
|
match String::from_utf8(payload) {
|
|
Ok(s) =>
|
|
return Ok(Async::Ready(Some(Message::Text(s)))),
|
|
Err(_) =>
|
|
return Ok(Async::Ready(Some(Message::Error))),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Ok(None) => {
|
|
if done {
|
|
return Ok(Async::Ready(None))
|
|
} else if self.closed {
|
|
if !self.error_sent {
|
|
self.error_sent = true;
|
|
return Ok(Async::Ready(Some(Message::Closed)))
|
|
} else {
|
|
return Ok(Async::Ready(None))
|
|
}
|
|
} else {
|
|
return Ok(Async::NotReady)
|
|
}
|
|
},
|
|
Err(_) => {
|
|
self.closed = true;
|
|
self.error_sent = true;
|
|
return Ok(Async::Ready(Some(Message::Error)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/// `WebSocket` writer
|
|
pub struct WsWriter;
|
|
|
|
impl WsWriter {
|
|
|
|
/// Send text frame
|
|
pub fn text<A, S>(ctx: &mut HttpContext<A, S>, text: &str)
|
|
where A: Actor<Context=HttpContext<A, S>>
|
|
{
|
|
let mut frame = wsframe::Frame::message(Vec::from(text), OpCode::Text, true);
|
|
let mut buf = Vec::new();
|
|
frame.format(&mut buf).unwrap();
|
|
|
|
ctx.write(buf);
|
|
}
|
|
|
|
/// Send binary frame
|
|
pub fn binary<A, S>(ctx: &mut HttpContext<A, S>, data: Vec<u8>)
|
|
where A: Actor<Context=HttpContext<A, S>>
|
|
{
|
|
let mut frame = wsframe::Frame::message(data, OpCode::Binary, true);
|
|
let mut buf = Vec::new();
|
|
frame.format(&mut buf).unwrap();
|
|
|
|
ctx.write(buf);
|
|
}
|
|
|
|
/// Send ping frame
|
|
pub fn ping<A, S>(ctx: &mut HttpContext<A, S>, message: &str)
|
|
where A: Actor<Context=HttpContext<A, S>>
|
|
{
|
|
let mut frame = wsframe::Frame::message(Vec::from(message), OpCode::Ping, true);
|
|
let mut buf = Vec::new();
|
|
frame.format(&mut buf).unwrap();
|
|
|
|
ctx.write(buf);
|
|
}
|
|
|
|
/// Send pong frame
|
|
pub fn pong<A, S>(ctx: &mut HttpContext<A, S>, message: &str)
|
|
where A: Actor<Context=HttpContext<A, S>>
|
|
{
|
|
let mut frame = wsframe::Frame::message(Vec::from(message), OpCode::Pong, true);
|
|
let mut buf = Vec::new();
|
|
frame.format(&mut buf).unwrap();
|
|
|
|
ctx.write(buf);
|
|
}
|
|
|
|
/// Send close frame
|
|
pub fn close<A, S>(ctx: &mut HttpContext<A, S>, code: CloseCode, reason: &str)
|
|
where A: Actor<Context=HttpContext<A, S>>
|
|
{
|
|
let mut frame = wsframe::Frame::close(code, reason);
|
|
let mut buf = Vec::new();
|
|
frame.format(&mut buf).unwrap();
|
|
ctx.write(buf);
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use std::str::FromStr;
|
|
use http::{Method, HeaderMap, Version, Uri, header};
|
|
|
|
#[test]
|
|
fn test_handshake() {
|
|
let req = HttpRequest::new(Method::POST, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, HeaderMap::new(), None);
|
|
assert_eq!(WsHandshakeError::GetMethodRequired, handshake(&req).err().unwrap());
|
|
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, HeaderMap::new(), None);
|
|
assert_eq!(WsHandshakeError::NoWebsocketUpgrade, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("test"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(WsHandshakeError::NoWebsocketUpgrade, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("websocket"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(WsHandshakeError::NoConnectionUpgrade, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("websocket"));
|
|
headers.insert(header::CONNECTION,
|
|
header::HeaderValue::from_static("upgrade"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(WsHandshakeError::NoVersionHeader, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("websocket"));
|
|
headers.insert(header::CONNECTION,
|
|
header::HeaderValue::from_static("upgrade"));
|
|
headers.insert(SEC_WEBSOCKET_VERSION,
|
|
header::HeaderValue::from_static("5"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(WsHandshakeError::UnsupportedVersion, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("websocket"));
|
|
headers.insert(header::CONNECTION,
|
|
header::HeaderValue::from_static("upgrade"));
|
|
headers.insert(SEC_WEBSOCKET_VERSION,
|
|
header::HeaderValue::from_static("13"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(WsHandshakeError::BadWebsocketKey, handshake(&req).err().unwrap());
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(header::UPGRADE,
|
|
header::HeaderValue::from_static("websocket"));
|
|
headers.insert(header::CONNECTION,
|
|
header::HeaderValue::from_static("upgrade"));
|
|
headers.insert(SEC_WEBSOCKET_VERSION,
|
|
header::HeaderValue::from_static("13"));
|
|
headers.insert(SEC_WEBSOCKET_KEY,
|
|
header::HeaderValue::from_static("13"));
|
|
let req = HttpRequest::new(Method::GET, Uri::from_str("/").unwrap(),
|
|
Version::HTTP_11, headers, None);
|
|
assert_eq!(StatusCode::SWITCHING_PROTOCOLS, handshake(&req).unwrap().status());
|
|
}
|
|
}
|