From 532cc431d1c5ca1ffcf429a4ccb94edc7848fe7a Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Thu, 30 May 2024 00:09:11 +0200
Subject: rename filters dir

---
 src/modules/proxy.rs | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 src/modules/proxy.rs

(limited to 'src/modules/proxy.rs')

diff --git a/src/modules/proxy.rs b/src/modules/proxy.rs
new file mode 100644
index 0000000..ce72f65
--- /dev/null
+++ b/src/modules/proxy.rs
@@ -0,0 +1,98 @@
+use super::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse};
+use crate::{helper::TokioIo, ServiceError};
+use futures::Future;
+use http_body_util::BodyExt;
+use hyper::{http::HeaderValue, upgrade::OnUpgrade, StatusCode};
+use log::{debug, warn};
+use serde::Deserialize;
+use serde_yaml::Value;
+use std::{net::SocketAddr, pin::Pin, sync::Arc};
+use tokio::net::TcpStream;
+
+#[derive(Default)]
+pub struct ProxyKind;
+
+#[derive(Debug, Deserialize)]
+struct Proxy {
+    backend: SocketAddr,
+}
+
+impl NodeKind for ProxyKind {
+    fn name(&self) -> &'static str {
+        "proxy"
+    }
+    fn instanciate(&self, config: Value) -> anyhow::Result<Arc<dyn Node>> {
+        Ok(Arc::new(serde_yaml::from_value::<Proxy>(config)?))
+    }
+}
+impl Node for Proxy {
+    fn handle<'a>(
+        &'a self,
+        context: &'a mut NodeContext,
+        mut request: NodeRequest,
+    ) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
+        Box::pin(async move {
+            request.headers_mut().insert(
+                "x-real-ip",
+                HeaderValue::from_str(&format!("{}", context.addr.ip())).unwrap(),
+            );
+
+            let on_upgrade_downstream = request.extensions_mut().remove::<OnUpgrade>();
+
+            let _limit_guard = context.state.l_outgoing.try_acquire()?;
+            debug!("\tforwarding to {}", self.backend);
+            let mut resp = {
+                let client_stream = TokioIo(
+                    TcpStream::connect(self.backend)
+                        .await
+                        .map_err(|_| ServiceError::CantConnect)?,
+                );
+
+                let (mut sender, conn) = hyper::client::conn::http1::handshake(client_stream)
+                    .await
+                    .map_err(ServiceError::Hyper)?;
+                tokio::task::spawn(async move {
+                    if let Err(err) = conn.with_upgrades().await {
+                        warn!("connection failed: {:?}", err);
+                    }
+                });
+                sender
+                    .send_request(request)
+                    .await
+                    .map_err(ServiceError::Hyper)?
+            };
+
+            if resp.status() == StatusCode::SWITCHING_PROTOCOLS {
+                let on_upgrade_upstream = resp
+                    .extensions_mut()
+                    .remove::<OnUpgrade>()
+                    .ok_or(ServiceError::UpgradeFailed)?;
+                let on_upgrade_downstream =
+                    on_upgrade_downstream.ok_or(ServiceError::UpgradeFailed)?;
+                tokio::task::spawn(async move {
+                    debug!("about to upgrade connection");
+                    match (on_upgrade_upstream.await, on_upgrade_downstream.await) {
+                        (Ok(upgraded_upstream), Ok(upgraded_downstream)) => {
+                            debug!("upgrade successful");
+                            match tokio::io::copy_bidirectional(
+                                &mut TokioIo(upgraded_downstream),
+                                &mut TokioIo(upgraded_upstream),
+                            )
+                            .await
+                            {
+                                Ok((from_client, from_server)) => {
+                                    debug!("proxy socket terminated: {from_server} sent, {from_client} received")
+                                }
+                                Err(e) => warn!("proxy socket error: {e}"),
+                            }
+                        }
+                        (a, b) => warn!("upgrade error: upstream={a:?} downstream={b:?}"),
+                    }
+                });
+            }
+
+            let resp = resp.map(|b| b.map_err(ServiceError::Hyper).boxed());
+            Ok(resp)
+        })
+    }
+}
-- 
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