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extern crate rustc_serialize;
extern crate sha1;
extern crate tiny_http;
use std::io::Cursor;
use std::io::Read;
use std::thread::spawn;
use rustc_serialize::base64::{Config, Newline, Standard, ToBase64};
fn home_page(port: u16) -> tiny_http::Response<Cursor<Vec<u8>>> {
tiny_http::Response::from_string(format!(
"
<script type=\"text/javascript\">
var socket = new WebSocket(\"ws://localhost:{}/\", \"ping\");
function send(data) {{
socket.send(data);
}}
socket.onmessage = function(event) {{
document.getElementById('result').innerHTML += event.data + '<br />';
}}
</script>
<p>This example will receive "Hello" for each byte in the packet being sent.
Tiny-http doesn't support decoding websocket frames, so we can't do anything better.</p>
<p><input type=\"text\" id=\"msg\" />
<button onclick=\"send(document.getElementById('msg').value)\">Send</button></p>
<p>Received: </p>
<p id=\"result\"></p>
",
port
))
.with_header(
"Content-type: text/html"
.parse::<tiny_http::Header>()
.unwrap(),
)
}
/// Turns a Sec-WebSocket-Key into a Sec-WebSocket-Accept.
/// Feel free to copy-paste this function, but please use a better error handling.
fn convert_key(input: &str) -> String {
use sha1::{Digest, Sha1};
let mut input = input.to_string().into_bytes();
let mut bytes = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
.to_string()
.into_bytes();
input.append(&mut bytes);
let mut sha1 = Sha1::new();
sha1.update(&input);
sha1.finalize().as_slice().to_base64(Config {
char_set: Standard,
pad: true,
line_length: None,
newline: Newline::LF,
})
}
fn main() {
let server = tiny_http::Server::http("0.0.0.0:0").unwrap();
let port = server.server_addr().to_ip().unwrap().port();
println!("Server started");
println!(
"To try this example, open a browser to http://localhost:{}/",
port
);
for request in server.incoming_requests() {
// we are handling this websocket connection in a new task
spawn(move || {
// checking the "Upgrade" header to check that it is a websocket
match request
.headers()
.iter()
.find(|h| h.field.equiv(&"Upgrade"))
.and_then(|hdr| {
if hdr.value == "websocket" {
Some(hdr)
} else {
None
}
}) {
None => {
// sending the HTML page
request.respond(home_page(port)).expect("Responded");
return;
}
_ => (),
};
// getting the value of Sec-WebSocket-Key
let key = match request
.headers()
.iter()
.find(|h| h.field.equiv(&"Sec-WebSocket-Key"))
.map(|h| h.value.clone())
{
None => {
let response = tiny_http::Response::new_empty(tiny_http::StatusCode(400));
request.respond(response).expect("Responded");
return;
}
Some(k) => k,
};
// building the "101 Switching Protocols" response
let response = tiny_http::Response::new_empty(tiny_http::StatusCode(101))
.with_header("Upgrade: websocket".parse::<tiny_http::Header>().unwrap())
.with_header("Connection: Upgrade".parse::<tiny_http::Header>().unwrap())
.with_header(
"Sec-WebSocket-Protocol: ping"
.parse::<tiny_http::Header>()
.unwrap(),
)
.with_header(
format!("Sec-WebSocket-Accept: {}", convert_key(key.as_str()))
.parse::<tiny_http::Header>()
.unwrap(),
);
//
let mut stream = request.upgrade("websocket", response);
//
loop {
let mut out = Vec::new();
match Read::by_ref(&mut stream).take(1).read_to_end(&mut out) {
Ok(n) if n >= 1 => {
// "Hello" frame
let data = [0x81, 0x05, 0x48, 0x65, 0x6c, 0x6c, 0x6f];
stream.write(&data).ok();
stream.flush().ok();
}
Ok(_) => panic!("eof ; should never happen"),
Err(e) => {
println!("closing connection because: {}", e);
return;
}
};
}
});
}
}
|
