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//! Server handshake machine.
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use httparse;
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use httparse::Status;
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use error::{Error, Result};
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use protocol::{WebSocket, Role};
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use super::headers::{Headers, FromHttparse, MAX_HEADERS};
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use super::machine::{HandshakeMachine, StageResult, TryParse};
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use super::{MidHandshake, HandshakeRole, ProcessingResult, convert_key};
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/// Request from the client.
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pub struct Request {
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/// Path part of the URL.
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pub path: String,
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/// HTTP headers.
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pub headers: Headers,
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}
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impl Request {
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/// Reply to the response.
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pub fn reply(&self) -> Result<Vec<u8>> {
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let key = self.headers.find_first("Sec-WebSocket-Key")
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.ok_or_else(|| Error::Protocol("Missing Sec-WebSocket-Key".into()))?;
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let reply = format!("\
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HTTP/1.1 101 Switching Protocols\r\n\
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Connection: Upgrade\r\n\
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Upgrade: websocket\r\n\
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Sec-WebSocket-Accept: {}\r\n\
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\r\n", convert_key(key)?);
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Ok(reply.into())
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}
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}
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impl TryParse for Request {
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fn try_parse(buf: &[u8]) -> Result<Option<(usize, Self)>> {
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let mut hbuffer = [httparse::EMPTY_HEADER; MAX_HEADERS];
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let mut req = httparse::Request::new(&mut hbuffer);
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Ok(match req.parse(buf)? {
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Status::Partial => None,
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Status::Complete(size) => Some((size, Request::from_httparse(req)?)),
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})
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}
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}
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impl<'h, 'b: 'h> FromHttparse<httparse::Request<'h, 'b>> for Request {
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fn from_httparse(raw: httparse::Request<'h, 'b>) -> Result<Self> {
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if raw.method.expect("Bug: no method in header") != "GET" {
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return Err(Error::Protocol("Method is not GET".into()));
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}
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if raw.version.expect("Bug: no HTTP version") < /*1.*/1 {
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return Err(Error::Protocol("HTTP version should be 1.1 or higher".into()));
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}
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Ok(Request {
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path: raw.path.expect("Bug: no path in header").into(),
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headers: Headers::from_httparse(raw.headers)?
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})
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}
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}
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/// Server handshake role.
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#[allow(missing_copy_implementations)]
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pub struct ServerHandshake;
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impl ServerHandshake {
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/// Start server handshake.
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pub fn start<Stream>(stream: Stream) -> MidHandshake<Stream, Self> {
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trace!("Server handshake initiated.");
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MidHandshake {
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machine: HandshakeMachine::start_read(stream),
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role: ServerHandshake,
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}
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}
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}
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impl HandshakeRole for ServerHandshake {
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type IncomingData = Request;
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fn stage_finished<Stream>(&self, finish: StageResult<Self::IncomingData, Stream>)
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-> Result<ProcessingResult<Stream>>
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{
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Ok(match finish {
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StageResult::DoneReading { stream, result, tail } => {
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if ! tail.is_empty() {
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return Err(Error::Protocol("Junk after client request".into()))
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}
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let response = result.reply()?;
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ProcessingResult::Continue(HandshakeMachine::start_write(stream, response))
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}
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StageResult::DoneWriting(stream) => {
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debug!("Server handshake done.");
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ProcessingResult::Done(WebSocket::from_raw_socket(stream, Role::Server))
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}
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})
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}
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}
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#[cfg(test)]
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mod tests {
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use super::Request;
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use super::super::machine::TryParse;
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#[test]
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fn request_parsing() {
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const DATA: &'static [u8] = b"GET /script.ws HTTP/1.1\r\nHost: foo.com\r\n\r\n";
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let (_, req) = Request::try_parse(DATA).unwrap().unwrap();
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assert_eq!(req.path, "/script.ws");
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assert_eq!(req.headers.find_first("Host"), Some(&b"foo.com"[..]));
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}
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#[test]
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fn request_replying() {
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const DATA: &'static [u8] = b"\
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GET /script.ws HTTP/1.1\r\n\
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Host: foo.com\r\n\
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Connection: upgrade\r\n\
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Upgrade: websocket\r\n\
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Sec-WebSocket-Version: 13\r\n\
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Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n\
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\r\n";
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let (_, req) = Request::try_parse(DATA).unwrap().unwrap();
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let _ = req.reply().unwrap();
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}
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}
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