66 lines
2.1 KiB
Rust
66 lines
2.1 KiB
Rust
//! client proxy
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mod http_proxy;
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mod socks_proxy;
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use anyhow::{Context as _, Result};
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use http_client::Url;
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use http_proxy::{HttpProxyType, connect_http_proxy_stream, parse_http_proxy};
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use socks_proxy::{SocksVersion, connect_socks_proxy_stream, parse_socks_proxy};
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pub(crate) async fn connect_proxy_stream(
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proxy: &Url,
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rpc_host: (&str, u16),
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) -> Result<Box<dyn AsyncReadWrite>> {
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let Some(((proxy_domain, proxy_port), proxy_type)) = parse_proxy_type(proxy) else {
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// If parsing the proxy URL fails, we must avoid falling back to an insecure connection.
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// SOCKS proxies are often used in contexts where security and privacy are critical,
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// so any fallback could expose users to significant risks.
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anyhow::bail!("Parsing proxy url failed");
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};
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// Connect to proxy and wrap protocol later
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let stream = tokio::net::TcpStream::connect((proxy_domain.as_str(), proxy_port))
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.await
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.context("Failed to connect to proxy")?;
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let proxy_stream = match proxy_type {
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ProxyType::SocksProxy(proxy) => connect_socks_proxy_stream(stream, proxy, rpc_host).await?,
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ProxyType::HttpProxy(proxy) => {
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connect_http_proxy_stream(stream, proxy, rpc_host, &proxy_domain).await?
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}
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};
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Ok(proxy_stream)
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}
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enum ProxyType<'t> {
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SocksProxy(SocksVersion<'t>),
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HttpProxy(HttpProxyType<'t>),
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}
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fn parse_proxy_type(proxy: &Url) -> Option<((String, u16), ProxyType<'_>)> {
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let scheme = proxy.scheme();
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let host = proxy.host()?.to_string();
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let port = proxy.port_or_known_default()?;
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let proxy_type = match scheme {
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scheme if scheme.starts_with("socks") => {
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Some(ProxyType::SocksProxy(parse_socks_proxy(scheme, proxy)))
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}
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scheme if scheme.starts_with("http") => {
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Some(ProxyType::HttpProxy(parse_http_proxy(scheme, proxy)))
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}
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_ => None,
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}?;
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Some(((host, port), proxy_type))
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}
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pub(crate) trait AsyncReadWrite:
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tokio::io::AsyncRead + tokio::io::AsyncWrite + Unpin + Send + 'static
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{
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}
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impl<T: tokio::io::AsyncRead + tokio::io::AsyncWrite + Unpin + Send + 'static> AsyncReadWrite
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for T
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{
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}
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