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use base64;
use rand;
use httparse;
use httparse::Status;
use std::io::Write;
use url::Url;
use error::{Error, Result};
use protocol::{WebSocket, Role};
use super::headers::{Headers, FromHttparse, MAX_HEADERS};
use super::{MidHandshake, HandshakeRole, ProcessingResult, convert_key};
use super::machine::{HandshakeMachine, StageResult, TryParse};
pub struct Request<'t> {
pub url: Url,
pub extra_headers: Option<&'t [(&'t str, &'t str)]>,
}
impl<'t> Request<'t> {
fn get_path(&self) -> String {
if let Some(query) = self.url.query() {
format!("{path}?{query}", path = self.url.path(), query = query)
} else {
self.url.path().into()
}
}
fn get_host(&self) -> String {
let host = self.url.host_str().expect("Bug: URL without host");
if let Some(port) = self.url.port() {
format!("{host}:{port}", host = host, port = port)
} else {
host.into()
}
}
}
pub struct ClientHandshake {
verify_data: VerifyData,
}
impl ClientHandshake {
pub fn start<Stream>(stream: Stream, request: Request) -> MidHandshake<Stream, Self> {
let key = generate_key();
let machine = {
let mut req = Vec::new();
write!(req, "\
GET {path} HTTP/1.1\r\n\
Host: {host}\r\n\
Connection: upgrade\r\n\
Upgrade: websocket\r\n\
Sec-WebSocket-Version: 13\r\n\
Sec-WebSocket-Key: {key}\r\n",
host = request.get_host(), path = request.get_path(), key = key).unwrap();
if let Some(eh) = request.extra_headers {
for &(k, v) in eh {
write!(req, "{}: {}\r\n", k, v).unwrap();
}
}
write!(req, "\r\n").unwrap();
HandshakeMachine::start_write(stream, req)
};
let client = {
let accept_key = convert_key(key.as_ref()).unwrap();
ClientHandshake {
verify_data: VerifyData {
accept_key: accept_key,
},
}
};
trace!("Client handshake initiated.");
MidHandshake { role: client, machine: machine }
}
}
impl HandshakeRole for ClientHandshake {
type IncomingData = Response;
fn stage_finished<Stream>(&self, finish: StageResult<Self::IncomingData, Stream>)
-> Result<ProcessingResult<Stream>>
{
Ok(match finish {
StageResult::DoneWriting(stream) => {
ProcessingResult::Continue(HandshakeMachine::start_read(stream))
}
StageResult::DoneReading { stream, result, tail, } => {
self.verify_data.verify_response(&result)?;
debug!("Client handshake done.");
ProcessingResult::Done(WebSocket::from_partially_read(stream, tail, Role::Client))
}
})
}
}
struct VerifyData {
accept_key: String,
}
impl VerifyData {
pub fn verify_response(&self, response: &Response) -> Result<()> {
if response.code != 101 {
return Err(Error::Http(response.code));
}
if !response.headers.header_is_ignore_case("Upgrade", "websocket") {
return Err(Error::Protocol("No \"Upgrade: websocket\" in server reply".into()));
}
if !response.headers.header_is_ignore_case("Connection", "Upgrade") {
return Err(Error::Protocol("No \"Connection: upgrade\" in server reply".into()));
}
if !response.headers.header_is("Sec-WebSocket-Accept", &self.accept_key) {
return Err(Error::Protocol("Key mismatch in Sec-WebSocket-Accept".into()));
}
Ok(())
}
}
pub struct Response {
code: u16,
headers: Headers,
}
impl TryParse for Response {
fn try_parse(buf: &[u8]) -> Result<Option<(usize, Self)>> {
let mut hbuffer = [httparse::EMPTY_HEADER; MAX_HEADERS];
let mut req = httparse::Response::new(&mut hbuffer);
Ok(match req.parse(buf)? {
Status::Partial => None,
Status::Complete(size) => Some((size, Response::from_httparse(req)?)),
})
}
}
impl<'h, 'b: 'h> FromHttparse<httparse::Response<'h, 'b>> for Response {
fn from_httparse(raw: httparse::Response<'h, 'b>) -> Result<Self> {
if raw.version.expect("Bug: no HTTP version") < 1 {
return Err(Error::Protocol("HTTP version should be 1.1 or higher".into()));
}
Ok(Response {
code: raw.code.expect("Bug: no HTTP response code"),
headers: Headers::from_httparse(raw.headers)?,
})
}
}
fn generate_key() -> String {
let r: [u8; 16] = rand::random();
base64::encode(&r)
}
#[cfg(test)]
mod tests {
use super::{Response, generate_key};
use super::super::machine::TryParse;
#[test]
fn random_keys() {
let k1 = generate_key();
println!("Generated random key 1: {}", k1);
let k2 = generate_key();
println!("Generated random key 2: {}", k2);
assert_ne!(k1, k2);
assert_eq!(k1.len(), k2.len());
assert_eq!(k1.len(), 24);
assert_eq!(k2.len(), 24);
assert!(k1.ends_with("=="));
assert!(k2.ends_with("=="));
assert!(k1[..22].find("=").is_none());
assert!(k2[..22].find("=").is_none());
}
#[test]
fn response_parsing() {
const DATA: &'static [u8] = b"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
let (_, resp) = Response::try_parse(DATA).unwrap().unwrap();
assert_eq!(resp.code, 200);
assert_eq!(resp.headers.find_first("Content-Type"), Some(&b"text/html"[..]));
}
}