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// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
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use async_std::net::TcpStream;
use async_tls::client::TlsStream;
use futures::io::{BufReader, BufWriter};
use futures::prelude::*;
use soketto::connection;
use soketto::handshake::client::{Client as WsRawClient, ServerResponse};
use std::{borrow::Cow, io, net::SocketAddr, time::Duration};
use thiserror::Error;
type TlsOrPlain = crate::stream::EitherStream<TcpStream, TlsStream<TcpStream>>;
/// Sending end of WebSocket transport.
pub struct Sender {
inner: connection::Sender<BufReader<BufWriter<TlsOrPlain>>>,
}
/// Receiving end of WebSocket transport.
pub struct Receiver {
inner: connection::Receiver<BufReader<BufWriter<TlsOrPlain>>>,
}
/// Builder for a WebSocket transport [`Sender`] and ['Receiver`] pair.
#[derive(Debug)]
/// What certificate store to use
pub certificate_store: CertificateStore,
/// Remote WebSocket target.
pub target: Target,
pub timeout: Duration,
/// `Origin` header to pass during the HTTP handshake. If `None`, no
/// `Origin` header is passed.
pub origin_header: Option<Cow<'a, str>>,
/// Max payload size
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pub max_request_body_size: u32,
}
/// Stream mode, either plain TCP or TLS.
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#[derive(Clone, Copy, Debug, PartialEq)]
pub enum Mode {
/// Plain mode (`ws://` URL).
Plain,
/// TLS mode (`wss://` URL).
Tls,
}
/// What certificate store to use
#[derive(Clone, Copy, Debug, PartialEq)]
#[non_exhaustive]
pub enum CertificateStore {
/// Use the native system certificate store
Native,
/// Use webPki's certificate store
WebPki,
}
/// Error that can happen during the initial handshake.
#[derive(Debug, Error)]
pub enum WsNewError {
/// Error when opening the TCP socket.
#[error("Error when opening the TCP socket: {}", 0)]
Io(io::Error),
/// Error in the WebSocket handshake.
#[error("Error in the WebSocket handshake: {}", 0)]
Handshake(#[source] soketto::handshake::Error),
/// Invalid DNS name error for TLS
#[error("Invalid DNS name: {}", 0)]
InvalidDnsName(#[source] webpki::InvalidDnsNameError),
/// RawServer rejected our handshake.
#[error("Server returned an error status code: {}", status_code)]
Rejected {
/// HTTP status code that the server returned.
status_code: u16,
},
/// Timeout while trying to connect.
#[error("Timeout when trying to connect")]
Timeout,
}
/// Error that can happen during the initial handshake.
#[derive(Debug, Error)]
pub enum WsHandshakeError {
/// Failed to load system certs
#[error("Failed to load system certs: {}", 0)]
CertificateStore(io::Error),
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/// Invalid URL.
#[error("Invalid url: {}", 0)]
Url(Cow<'static, str>),
/// Error when trying to connect.
///
/// If multiple IP addresses are attempted, only the last error is returned, similar to how
/// [`std::net::TcpStream::connect`] behaves.
#[error("Error when trying to connect: {}", 0)]
Connect(WsNewError),
/// Failed to resolve IP addresses for this hostname.
#[error("Failed to resolve IP addresses for this hostname: {}", 0)]
ResolutionFailed(io::Error),
/// Couldn't find any IP address for this hostname.
#[error("Couldn't find any IP address for this hostname")]
NoAddressFound,
}
/// Error that can happen during a request.
#[derive(Debug, Error)]
pub enum WsConnectError {
/// Error while serializing the request.
// TODO: can that happen?
#[error("error while serializing the request")]
Serialization(#[source] serde_json::error::Error),
/// Error in the WebSocket connection.
#[error("error in the WebSocket connection")]
Ws(#[source] soketto::connection::Error),
/// Failed to parse the JSON returned by the server into a JSON-RPC response.
#[error("error while parsing the response body")]
ParseError(#[source] serde_json::error::Error),
}
impl Sender {
/// Sends out a request. Returns a `Future` that finishes when the request has been
pub async fn send(&mut self, body: String) -> Result<(), WsConnectError> {
log::debug!("send: {}", body);
self.inner.send_text(body).await?;
self.inner.flush().await?;
Ok(())
}
}
impl Receiver {
/// Returns a `Future` resolving when the server sent us something back.
pub async fn next_response(&mut self) -> Result<Vec<u8>, WsConnectError> {
let mut message = Vec::new();
self.inner.receive_data(&mut message).await?;
}
}
impl<'a> WsTransportClientBuilder<'a> {
/// Try to establish the connection.
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pub async fn build(self) -> Result<(Sender, Receiver), WsHandshakeError> {
let connector = match self.target.mode {
Mode::Tls => {
let mut client_config = rustls::ClientConfig::default();
if let CertificateStore::Native = self.certificate_store {
client_config.root_store = rustls_native_certs::load_native_certs()
.map_err(|(_, e)| WsHandshakeError::CertificateStore(e))?;
}
Some(client_config.into())
}
Mode::Plain => None,
};
for sockaddr in &self.target.sockaddrs {
match self.try_connect(*sockaddr, &connector).await {
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Ok(res) => return Ok(res),
Err(e) => {
log::debug!("Failed to connect to sockaddr: {:?} with err: {:?}", sockaddr, e);
}
}
}
Err(WsHandshakeError::NoAddressFound)
}
async fn try_connect(
&self,
sockaddr: SocketAddr,
tls_connector: &Option<async_tls::TlsConnector>,
) -> Result<(Sender, Receiver), WsNewError> {
// Try establish the TCP connection.
let tcp_stream = {
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let socket = TcpStream::connect(sockaddr);
let timeout = async_std::task::sleep(self.timeout);
futures::pin_mut!(socket, timeout);
match future::select(socket, timeout).await {
future::Either::Left((socket, _)) => {
let socket = socket?;
if let Err(err) = socket.set_nodelay(true) {
log::warn!("set nodelay failed: {:?}", err);
match tls_connector {
None => TlsOrPlain::Plain(socket),
Some(connector) => {
let dns_name: &str =
webpki::DnsNameRef::try_from_ascii_str(self.target.host.as_str())?.into();
let tls_stream = connector.connect(dns_name, socket).await?;
TlsOrPlain::Tls(tls_stream)
}
}
}
future::Either::Right((_, _)) => return Err(WsNewError::Timeout),
}
};
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let mut client =
WsRawClient::new(BufReader::new(BufWriter::new(tcp_stream)), &self.target.host, &self.target.path);
if let Some(origin) = self.origin_header.as_ref() {
client.set_origin(origin);
}
// Perform the initial handshake.
match client.handshake().await? {
ServerResponse::Accepted { .. } => {}
ServerResponse::Rejected { status_code } | ServerResponse::Redirect { status_code, .. } => {
// TODO: HTTP redirects also lead here
return Err(WsNewError::Rejected { status_code });
}
}
// If the handshake succeeded, return.
let mut builder = client.into_builder();
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builder.set_max_message_size(self.max_request_body_size as usize);
let (sender, receiver) = builder.finish();
Ok((Sender { inner: sender }, Receiver { inner: receiver }))
}
}
impl From<io::Error> for WsNewError {
fn from(err: io::Error) -> WsNewError {
WsNewError::Io(err)
}
}
impl From<webpki::InvalidDnsNameError> for WsNewError {
fn from(err: webpki::InvalidDnsNameError) -> WsNewError {
WsNewError::InvalidDnsName(err)
}
}
impl From<soketto::handshake::Error> for WsNewError {
fn from(err: soketto::handshake::Error) -> WsNewError {
WsNewError::Handshake(err)
}
}
impl From<WsNewError> for WsHandshakeError {
fn from(err: WsNewError) -> WsHandshakeError {
WsHandshakeError::Connect(err)
}
}
impl From<soketto::connection::Error> for WsConnectError {
fn from(err: soketto::connection::Error) -> Self {
WsConnectError::Ws(err)
}
}
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/// Represents a verified remote WebSocket address.
#[derive(Debug, Clone)]
pub struct Target {
/// Socket addresses resolved the host name.
sockaddrs: Vec<SocketAddr>,
/// The host name (domain or IP address).
host: String,
/// WebSocket stream mode, see [`Mode`] for further documentation.
mode: Mode,
/// The HTTP host resource path.
path: String,
}
impl Target {
/// Parse an URL String to a WebSocket address.
pub fn parse(url: impl AsRef<str>) -> Result<Self, WsHandshakeError> {
let url =
url::Url::parse(url.as_ref()).map_err(|e| WsHandshakeError::Url(format!("Invalid URL: {}", e).into()))?;
let mode = match url.scheme() {
"ws" => Mode::Plain,
"wss" => Mode::Tls,
_ => return Err(WsHandshakeError::Url("URL scheme not supported, expects 'ws' or 'wss'".into())),
};
let host =
url.host_str().map(ToOwned::to_owned).ok_or_else(|| WsHandshakeError::Url("No host in URL".into()))?;
// NOTE: `Url::socket_addrs` is using the default port if it's missing (ws:// - 80, wss:// - 443)
let sockaddrs = url.socket_addrs(|| None).map_err(WsHandshakeError::ResolutionFailed)?;
Ok(Self { sockaddrs, host, mode, path: url.path().to_owned() })
}
}
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#[cfg(test)]
mod tests {
use super::{Mode, Target, WsHandshakeError};
fn assert_ws_target(target: Target, host: &str, mode: Mode, path: &str) {
assert_eq!(&target.host, host);
assert_eq!(target.mode, mode);
assert_eq!(&target.path, path);
}
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#[test]
fn ws_works() {
let target = Target::parse("ws://127.0.0.1:9933").unwrap();
assert_ws_target(target, "127.0.0.1", Mode::Plain, "/");
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}
#[test]
fn wss_works() {
let target = Target::parse("wss://kusama-rpc.polkadot.io:443").unwrap();
assert_ws_target(target, "kusama-rpc.polkadot.io", Mode::Tls, "/");
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}
#[test]
fn faulty_url_scheme() {
let err = Target::parse("http://kusama-rpc.polkadot.io:443").unwrap_err();
assert!(matches!(err, WsHandshakeError::Url(_)));
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}
#[test]
fn faulty_port() {
let err = Target::parse("ws://127.0.0.1:-43").unwrap_err();
assert!(matches!(err, WsHandshakeError::Url(_)));
let err = Target::parse("ws://127.0.0.1:99999").unwrap_err();
assert!(matches!(err, WsHandshakeError::Url(_)));
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}
#[test]
fn default_port_works() {
let target = Target::parse("ws://127.0.0.1").unwrap();
assert_ws_target(target, "127.0.0.1", Mode::Plain, "/");
}
#[test]
fn url_with_path_works() {
let target = Target::parse("ws://127.0.0.1/my-special-path").unwrap();
assert_ws_target(target, "127.0.0.1", Mode::Plain, "/my-special-path");