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@ -1,5 +1,10 @@ |
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//! Server handshake machine.
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use std::fmt::Write as FmtWrite; |
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use std::io::{Read, Write}; |
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use std::marker::PhantomData; |
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use std::mem::replace; |
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use httparse; |
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use httparse::Status; |
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@ -19,15 +24,23 @@ pub struct Request { |
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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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pub fn reply(&self, extra_headers: Option<Vec<(String, String)>>) -> 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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let mut reply = format!( |
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"\ |
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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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convert_key(key)? |
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); |
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if let Some(eh) = extra_headers { |
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for (k, v) in eh { |
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write!(reply, "{}: {}\r\n", k, v).unwrap(); |
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} |
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} |
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write!(reply, "\r\n").unwrap(); |
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Ok(reply.into()) |
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} |
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} |
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@ -58,42 +71,68 @@ impl<'h, 'b: 'h> FromHttparse<httparse::Request<'h, 'b>> for Request { |
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} |
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} |
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/// The callback type, the callback is called when the server receives an incoming WebSocket
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/// handshake request from the client, specifying a callback allows you to analyze incoming headers
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/// and add additional headers to the response that server sends to the client and/or reject the
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/// connection based on the incoming headers. Due to usability problems which are caused by a
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/// static dispatch when using callbacks in such places, the callback is boxed.
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///
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/// The type uses `FnMut` instead of `FnOnce` as it is impossible to box `FnOnce` in the current
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/// Rust version, `FnBox` is still unstable, this code has to be updated for `FnBox` when it gets
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/// stable.
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pub type Callback = Box<FnMut(&Request) -> Result<Option<Vec<(String, String)>>>>; |
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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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/// Incoming headers, received from the client.
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headers: Option<Headers>, |
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pub struct ServerHandshake<S> { |
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/// Callback which is called whenever the server read the request from the client and is ready
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/// to reply to it. The callback returns an optional headers which will be added to the reply
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/// which the server sends to the user.
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callback: Option<Callback>, |
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/// Internal stream type.
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_marker: PhantomData<S>, |
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} |
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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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impl<S: Read + Write> ServerHandshake<S> { |
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/// Start server handshake. `callback` specifies a custom callback which the user can pass to
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/// the handshake, this callback will be called when the a websocket client connnects to the
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/// server, you can specify the callback if you want to add additional header to the client
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/// upon join based on the incoming headers.
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pub fn start(stream: S, callback: Option<Callback>) -> MidHandshake<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 { headers: None }, |
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role: ServerHandshake { callback, _marker: PhantomData }, |
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} |
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} |
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} |
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impl HandshakeRole for ServerHandshake { |
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impl<S: Read + Write> HandshakeRole for ServerHandshake<S> { |
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type IncomingData = Request; |
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fn stage_finished<Stream>(&mut self, finish: StageResult<Self::IncomingData, Stream>) |
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-> Result<ProcessingResult<Stream>> |
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type InternalStream = S; |
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type FinalResult = WebSocket<S>; |
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fn stage_finished(&mut self, finish: StageResult<Self::IncomingData, Self::InternalStream>) |
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-> Result<ProcessingResult<Self::InternalStream, Self::FinalResult>> |
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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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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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self.headers = Some(result.headers); |
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let extra_headers = { |
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if let Some(mut callback) = replace(&mut self.callback, None) { |
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callback(&result)? |
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} else { |
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None |
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} |
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}; |
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let response = result.reply(extra_headers)?; |
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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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let headers = self.headers.take().expect("Bug: accepted client without headers"); |
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ProcessingResult::Done(WebSocket::from_raw_socket(stream, Role::Server), headers) |
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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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@ -101,9 +140,9 @@ impl HandshakeRole for ServerHandshake { |
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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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use super::super::client::Response; |
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#[test] |
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fn request_parsing() { |
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@ -124,7 +163,15 @@ mod tests { |
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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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let _ = req.reply(None).unwrap(); |
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let extra_headers = Some(vec![(String::from("MyCustomHeader"), |
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String::from("MyCustomValue")), |
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(String::from("MyVersion"), |
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String::from("LOL"))]); |
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let reply = req.reply(extra_headers).unwrap(); |
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let (_, req) = Response::try_parse(&reply).unwrap().unwrap(); |
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assert_eq!(req.headers.find_first("MyCustomHeader"), Some(b"MyCustomValue".as_ref())); |
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assert_eq!(req.headers.find_first("MyVersion"), Some(b"LOL".as_ref())); |
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} |
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} |
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Daniel Abramov
7 years ago