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upgrade.rs
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upgrade.rs
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// Port of hyper_tunstenite for fastwebsockets.
// https://github.com/de-vri-es/hyper-tungstenite-rs
//
// Copyright 2021, Maarten de Vries [email protected]
// BSD 2-Clause "Simplified" License
//
// Copyright 2023 Divy Srivastava <[email protected]>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use base64;
use base64::engine::general_purpose::STANDARD;
use base64::Engine;
use http_body_util::Empty;
use hyper::body::Bytes;
use hyper::Request;
use hyper::Response;
use hyper_util::rt::TokioIo;
use pin_project::pin_project;
use sha1::Digest;
use sha1::Sha1;
use std::pin::Pin;
use std::task::Context;
use std::task::Poll;
use crate::Role;
use crate::WebSocket;
use crate::WebSocketError;
fn sec_websocket_protocol(key: &[u8]) -> String {
let mut sha1 = Sha1::new();
sha1.update(key);
sha1.update(b"258EAFA5-E914-47DA-95CA-C5AB0DC85B11"); // magic string
let result = sha1.finalize();
STANDARD.encode(&result[..])
}
type Error = WebSocketError;
pub struct IncomingUpgrade {
key: String,
on_upgrade: hyper::upgrade::OnUpgrade,
}
impl IncomingUpgrade {
pub fn upgrade(self) -> Result<(Response<Empty<Bytes>>, UpgradeFut), Error> {
let response = Response::builder()
.status(hyper::StatusCode::SWITCHING_PROTOCOLS)
.header(hyper::header::CONNECTION, "upgrade")
.header(hyper::header::UPGRADE, "websocket")
.header("Sec-WebSocket-Accept", self.key)
.body(Empty::new())
.expect("bug: failed to build response");
let stream = UpgradeFut {
inner: self.on_upgrade,
};
Ok((response, stream))
}
}
#[cfg(feature = "with_axum")]
#[async_trait::async_trait]
impl<S> axum_core::extract::FromRequestParts<S> for IncomingUpgrade
where
S: Sync,
{
type Rejection = hyper::StatusCode;
async fn from_request_parts(
parts: &mut http::request::Parts,
_state: &S,
) -> Result<Self, Self::Rejection> {
let key = parts
.headers
.get("Sec-WebSocket-Key")
.ok_or(hyper::StatusCode::BAD_REQUEST)?;
if parts
.headers
.get("Sec-WebSocket-Version")
.map(|v| v.as_bytes())
!= Some(b"13")
{
return Err(hyper::StatusCode::BAD_REQUEST);
}
let on_upgrade = parts
.extensions
.remove::<hyper::upgrade::OnUpgrade>()
.ok_or(hyper::StatusCode::BAD_REQUEST)?;
Ok(Self {
on_upgrade,
key: sec_websocket_protocol(key.as_bytes()),
})
}
}
/// A future that resolves to a websocket stream when the associated HTTP upgrade completes.
#[pin_project]
#[derive(Debug)]
pub struct UpgradeFut {
#[pin]
inner: hyper::upgrade::OnUpgrade,
}
/// Try to upgrade a received `hyper::Request` to a websocket connection.
///
/// The function returns a HTTP response and a future that resolves to the websocket stream.
/// The response body *MUST* be sent to the client before the future can be resolved.
///
/// This functions checks `Sec-WebSocket-Key` and `Sec-WebSocket-Version` headers.
/// It does not inspect the `Origin`, `Sec-WebSocket-Protocol` or `Sec-WebSocket-Extensions` headers.
/// You can inspect the headers manually before calling this function,
/// and modify the response headers appropriately.
///
/// This function also does not look at the `Connection` or `Upgrade` headers.
/// To check if a request is a websocket upgrade request, you can use [`is_upgrade_request`].
/// Alternatively you can inspect the `Connection` and `Upgrade` headers manually.
///
pub fn upgrade<B>(
mut request: impl std::borrow::BorrowMut<Request<B>>,
) -> Result<(Response<Empty<Bytes>>, UpgradeFut), Error> {
let request = request.borrow_mut();
let key = request
.headers()
.get("Sec-WebSocket-Key")
.ok_or(WebSocketError::MissingSecWebSocketKey)?;
if request
.headers()
.get("Sec-WebSocket-Version")
.map(|v| v.as_bytes())
!= Some(b"13")
{
return Err(WebSocketError::InvalidSecWebsocketVersion);
}
let response = Response::builder()
.status(hyper::StatusCode::SWITCHING_PROTOCOLS)
.header(hyper::header::CONNECTION, "upgrade")
.header(hyper::header::UPGRADE, "websocket")
.header(
"Sec-WebSocket-Accept",
&sec_websocket_protocol(key.as_bytes()),
)
.body(Empty::new())
.expect("bug: failed to build response");
let stream = UpgradeFut {
inner: hyper::upgrade::on(request),
};
Ok((response, stream))
}
/// Check if a request is a websocket upgrade request.
///
/// If the `Upgrade` header lists multiple protocols,
/// this function returns true if of them are `"websocket"`,
/// If the server supports multiple upgrade protocols,
/// it would be more appropriate to try each listed protocol in order.
pub fn is_upgrade_request<B>(request: &hyper::Request<B>) -> bool {
header_contains_value(request.headers(), hyper::header::CONNECTION, "Upgrade")
&& header_contains_value(
request.headers(),
hyper::header::UPGRADE,
"websocket",
)
}
/// Check if there is a header of the given name containing the wanted value.
fn header_contains_value(
headers: &hyper::HeaderMap,
header: impl hyper::header::AsHeaderName,
value: impl AsRef<[u8]>,
) -> bool {
let value = value.as_ref();
for header in headers.get_all(header) {
if header
.as_bytes()
.split(|&c| c == b',')
.any(|x| trim(x).eq_ignore_ascii_case(value))
{
return true;
}
}
false
}
fn trim(data: &[u8]) -> &[u8] {
trim_end(trim_start(data))
}
fn trim_start(data: &[u8]) -> &[u8] {
if let Some(start) = data.iter().position(|x| !x.is_ascii_whitespace()) {
&data[start..]
} else {
b""
}
}
fn trim_end(data: &[u8]) -> &[u8] {
if let Some(last) = data.iter().rposition(|x| !x.is_ascii_whitespace()) {
&data[..last + 1]
} else {
b""
}
}
impl std::future::Future for UpgradeFut {
type Output = Result<WebSocket<TokioIo<hyper::upgrade::Upgraded>>, Error>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let this = self.project();
let upgraded = match this.inner.poll(cx) {
Poll::Pending => return Poll::Pending,
Poll::Ready(x) => x,
};
Poll::Ready(Ok(WebSocket::after_handshake(
TokioIo::new(upgraded?),
Role::Server,
)))
}
}