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pub mod headers;
pub mod client;
pub mod server;
mod machine;
use std::error::Error as ErrorTrait;
use std::fmt;
use std::io::{Read, Write};
use base64;
use sha1::Sha1;
use error::Error;
use protocol::WebSocket;
use self::machine::{HandshakeMachine, RoundResult, StageResult, TryParse};
pub struct MidHandshake<Stream, Role> {
role: Role,
machine: HandshakeMachine<Stream>,
}
impl<Stream, Role> MidHandshake<Stream, Role> {
pub fn get_ref(&self) -> &Stream {
self.machine.get_ref()
}
pub fn get_mut(&mut self) -> &mut Stream {
self.machine.get_mut()
}
}
impl<Stream: Read + Write, Role: HandshakeRole> MidHandshake<Stream, Role> {
pub fn handshake(self) -> Result<WebSocket<Stream>, HandshakeError<Stream, Role>> {
let mut mach = self.machine;
loop {
mach = match mach.single_round()? {
RoundResult::WouldBlock(m) => {
return Err(HandshakeError::Interrupted(MidHandshake { machine: m, ..self }))
}
RoundResult::Incomplete(m) => m,
RoundResult::StageFinished(s) => {
match self.role.stage_finished(s)? {
ProcessingResult::Continue(m) => m,
ProcessingResult::Done(ws) => return Ok(ws),
}
}
}
}
}
}
pub enum HandshakeError<Stream, Role> {
Interrupted(MidHandshake<Stream, Role>),
Failure(Error),
}
impl<Stream, Role> fmt::Debug for HandshakeError<Stream, Role> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
HandshakeError::Interrupted(_) => write!(f, "HandshakeError::Interrupted(...)"),
HandshakeError::Failure(ref e) => write!(f, "HandshakeError::Failure({:?})", e),
}
}
}
impl<Stream, Role> fmt::Display for HandshakeError<Stream, Role> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
HandshakeError::Interrupted(_) => write!(f, "Interrupted handshake (WouldBlock)"),
HandshakeError::Failure(ref e) => write!(f, "{}", e),
}
}
}
impl<Stream, Role> ErrorTrait for HandshakeError<Stream, Role> {
fn description(&self) -> &str {
match *self {
HandshakeError::Interrupted(_) => "Interrupted handshake",
HandshakeError::Failure(ref e) => e.description(),
}
}
}
impl<Stream, Role> From<Error> for HandshakeError<Stream, Role> {
fn from(err: Error) -> Self {
HandshakeError::Failure(err)
}
}
pub trait HandshakeRole {
#[doc(hidden)]
type IncomingData: TryParse;
#[doc(hidden)]
fn stage_finished<Stream>(&self, finish: StageResult<Self::IncomingData, Stream>)
-> Result<ProcessingResult<Stream>, Error>;
}
#[doc(hidden)]
pub enum ProcessingResult<Stream> {
Continue(HandshakeMachine<Stream>),
Done(WebSocket<Stream>),
}
fn convert_key(input: &[u8]) -> Result<String, Error> {
const WS_GUID: &'static [u8] = b"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
let mut sha1 = Sha1::new();
sha1.update(input);
sha1.update(WS_GUID);
Ok(base64::encode(&sha1.digest().bytes()))
}
#[cfg(test)]
mod tests {
use super::convert_key;
#[test]
fn key_conversion() {
assert_eq!(convert_key(b"dGhlIHNhbXBsZSBub25jZQ==").unwrap(),
"s3pPLMBiTxaQ9kYGzzhZRbK+xOo=");
}
}