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tungstenite-rs/src/handshake/server.rs

161 lines
5.0 KiB

use std::io::{Cursor, Read, Write};
use bytes::Buf;
use httparse;
use httparse::Status;
use input_buffer::{InputBuffer, MIN_READ};
use error::{Error, Result};
use protocol::{WebSocket, Role};
use super::{
Handshake,
HandshakeResult,
Headers,
Httparse,
FromHttparse,
convert_key,
MAX_HEADERS
};
use util::NonBlockingResult;
/// Request from the client.
pub struct Request {
path: String,
headers: Headers,
}
impl Request {
/// Parse the request from a stream.
pub fn parse<B: Buf>(input: &mut B) -> Result<Option<Self>> {
Request::parse_http(input)
}
/// Reply to the response.
pub fn reply(&self) -> Result<Vec<u8>> {
let key = self.headers.find_first("Sec-WebSocket-Key")
.ok_or(Error::Protocol("Missing Sec-WebSocket-Key".into()))?;
let reply = format!("\
HTTP/1.1 101 Switching Protocols\r\n\
Connection: Upgrade\r\n\
Upgrade: websocket\r\n\
Sec-WebSocket-Accept: {}\r\n\
\r\n", convert_key(key)?);
Ok(reply.into())
}
}
impl Httparse for Request {
fn httparse(buf: &[u8]) -> Result<Option<(usize, Self)>> {
let mut hbuffer = [httparse::EMPTY_HEADER; MAX_HEADERS];
let mut req = httparse::Request::new(&mut hbuffer);
Ok(match req.parse(buf)? {
Status::Partial => None,
Status::Complete(size) => Some((size, Request::from_httparse(req)?)),
})
}
}
impl<'h, 'b: 'h> FromHttparse<httparse::Request<'h, 'b>> for Request {
fn from_httparse(raw: httparse::Request<'h, 'b>) -> Result<Self> {
if raw.method.expect("Bug: no method in header") != "GET" {
return Err(Error::Protocol("Method is not GET".into()));
}
if raw.version.expect("Bug: no HTTP version") < /*1.*/1 {
return Err(Error::Protocol("HTTP version should be 1.1 or higher".into()));
}
Ok(Request {
path: raw.path.expect("Bug: no path in header").into(),
headers: Headers::from_httparse(raw.headers)?
})
}
}
/// Server handshake
pub struct ServerHandshake<Stream> {
stream: Stream,
state: HandshakeState,
}
impl<Stream: Read + Write> ServerHandshake<Stream> {
/// Start a new server handshake on top of given stream.
pub fn new(stream: Stream) -> Self {
ServerHandshake {
stream: stream,
state: HandshakeState::ReceivingRequest(InputBuffer::with_capacity(MIN_READ)),
}
}
}
impl<Stream: Read + Write> Handshake for ServerHandshake<Stream> {
type Stream = WebSocket<Stream>;
fn handshake(mut self) -> Result<HandshakeResult<Self>> {
debug!("Performing server handshake...");
match self.state {
HandshakeState::ReceivingRequest(mut req_buf) => {
req_buf.reserve(MIN_READ, usize::max_value())
.map_err(|_| Error::Capacity("Header too long".into()))?;
req_buf.read_from(&mut self.stream).no_block()?;
let state = if let Some(req) = Request::parse(&mut req_buf)? {
let resp = req.reply()?;
HandshakeState::SendingResponse(Cursor::new(resp))
} else {
HandshakeState::ReceivingRequest(req_buf)
};
Ok(HandshakeResult::Incomplete(ServerHandshake {
state: state,
..self
}))
}
HandshakeState::SendingResponse(mut resp) => {
let size = self.stream.write(Buf::bytes(&resp)).no_block()?.unwrap_or(0);
Buf::advance(&mut resp, size);
if resp.has_remaining() {
Ok(HandshakeResult::Incomplete(ServerHandshake {
state: HandshakeState::SendingResponse(resp),
..self
}))
} else {
let ws = WebSocket::from_raw_socket(self.stream, Role::Server);
Ok(HandshakeResult::Done(ws))
}
}
}
}
}
enum HandshakeState {
ReceivingRequest(InputBuffer),
SendingResponse(Cursor<Vec<u8>>),
}
#[cfg(test)]
mod tests {
use super::Request;
use std::io::Cursor;
#[test]
fn request_parsing() {
const data: &'static [u8] = b"GET /script.ws HTTP/1.1\r\nHost: foo.com\r\n\r\n";
let mut inp = Cursor::new(data);
let req = Request::parse(&mut inp).unwrap().unwrap();
assert_eq!(req.path, "/script.ws");
assert_eq!(req.headers.find_first("Host"), Some(&b"foo.com"[..]));
}
#[test]
fn request_replying() {
const data: &'static [u8] = b"\
GET /script.ws HTTP/1.1\r\n\
Host: foo.com\r\n\
Connection: upgrade\r\n\
Upgrade: websocket\r\n\
Sec-WebSocket-Version: 13\r\n\
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n\
\r\n";
let mut inp = Cursor::new(data);
let req = Request::parse(&mut inp).unwrap().unwrap();
let reply = req.reply().unwrap();
}
}