god is dead and we have killed him.

author: Melody Horn <melody@boringcactus.com> 2021-11-12 22:38:39 -0700
committer: Melody Horn <melody@boringcactus.com> 2021-11-12 22:38:39 -0700
commit: f79b75710167088e2031a82a94a8d127fbb16a1f (patch)
tree: ffbbd167c34864d92b1d1e0a3b40da77e0b06874 /src
parent: fad6b7b755b788ca0d9113999faa8fb0d6f89ad0 (diff)
download: narchttpd-f79b75710167088e2031a82a94a8d127fbb16a1f.tar.gz
narchttpd-f79b75710167088e2031a82a94a8d127fbb16a1f.zip
4 files changed, 272 insertions, 1 deletions
diff --git a/src/main.rs b/src/main.rs
index 97a8ae6..0951518 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,124 @@
+use std::convert::Infallible;
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use std::rc::Rc;
+use std::sync::Arc;
+
+use hyper::service::{make_service_fn, service_fn};
+use hyper::{header, Body, Request, Response, Server, StatusCode};
+use rhai::{Dynamic, Engine, FnPtr, Map, NativeCallContext, Scope};
+use structopt::StructOpt;
+
+mod utils;
+
+#[derive(Debug, StructOpt)]
+struct Opt {
+    #[structopt(long, parse(from_os_str), default_value = "narchttpd.rhai")]
+    config_script: PathBuf,
+}
+
+fn make_engine() -> Engine {
+    let mut engine = Engine::new();
+    engine.register_type_with_name::<Rc<Request<Body>>>("Request");
+    engine.register_type::<utils::serve_static::Params>();
+    engine.register_fn(
+        "handle_request_serve_static",
+        utils::serve_static::handle_request,
+    );
+    engine.register_fn("serve_static", utils::serve_static::serve_static);
+    engine.register_fn(
+        "handle_request_proxy_child",
+        utils::proxy_child::handle_request,
+    );
+    engine.register_fn("proxy_child", utils::proxy_child::proxy_child);
+    engine
+}
+
+fn get_config_scope(engine: &Engine, opt: &Opt) -> Scope<'static> {
+    let mut ast = engine.compile_file(opt.config_script.clone()).unwrap();
+
+    let mut scope = Scope::new();
+    scope.push("http_ports", [80]);
+    scope.push("https_ports", [443]);
+    scope.push("domains", Map::new());
+    let export_ast = engine
+        .compile("export http_ports, https_ports, domains;")
+        .unwrap();
+    ast.combine(export_ast);
+    let _: () = engine.eval_ast_with_scope(&mut scope, &ast).unwrap();
+    scope
+}
+
 #[tokio::main]
 async fn main() {
-    // swag
+    let opt = Arc::new(Opt::from_args());
+
+    let engine = make_engine();
+    let scope = get_config_scope(&engine, &opt);
+
+    let http_ports: rhai::Array = scope.get_value("http_ports").unwrap();
+    let http_ports: Vec<u16> = http_ports
+        .into_iter()
+        .map(|x| x.as_int().unwrap() as u16)
+        .collect();
+    let https_ports: rhai::Array = scope.get_value("https_ports").unwrap();
+    let https_ports: Vec<u16> = https_ports
+        .into_iter()
+        .map(|x| x.as_int().unwrap() as u16)
+        .collect();
+
+    assert!(https_ports.is_empty(), "HTTPS is complicated oops");
+
+    // TODO learn hyper
+    let do_response = move |ctx: &NativeCallContext, domains: Map, req: Request<Body>| {
+        for (domain, handler) in &domains {
+            let req_domain = req.headers().get(header::HOST).unwrap();
+            if domain.as_str() == req_domain {
+                eprintln!("request {:?} matched domain {}", req, domain);
+                // matched!
+                let handler: FnPtr = handler.clone_cast();
+                let args = [Dynamic::from(Rc::new(req))];
+                let result = handler.call_dynamic(ctx, None, args).unwrap();
+                let result: Rc<Response<Body>> = result.cast();
+                return Rc::try_unwrap(result).unwrap();
+            }
+        }
+        Response::builder()
+            .status(StatusCode::NOT_FOUND)
+            .body(Body::from("Not Found"))
+            .unwrap()
+    };
+    let addr = http_ports.into_iter().flat_map(|port| {
+        ["127.0.0.1", "::1"]
+            .iter()
+            .map(move |ip| SocketAddr::new(ip.parse().unwrap(), port))
+    });
+
+    let make_svc = make_service_fn(move |_conn| async move {
+        Ok::<_, Infallible>(service_fn(move |req| async move {
+            let handle = tokio::runtime::Handle::current();
+            let response = handle
+                .spawn_blocking(move || {
+                    let opt = Opt::from_args();
+                    let engine = make_engine();
+                    let scope = get_config_scope(&engine, &opt);
+                    let request_handler_context =
+                        NativeCallContext::new(&engine, "handle_request", &[]);
+                    let domains: Map = scope.get_value("domains").unwrap();
+                    do_response(&request_handler_context, domains, req)
+                })
+                .await
+                .unwrap();
+            Ok::<_, Infallible>(response)
+        }))
+    });
+
+    // TODO uhh
+    let mut addr = addr;
+    let addr = addr.nth(0).unwrap();
+    let server = Server::bind(&addr).serve(make_svc);
+
+    if let Err(e) = server.await {
+        eprintln!("server error: {}", e);
+    }
 }
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..0bd5c2e
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,2 @@
+pub mod proxy_child;
+pub mod serve_static;
diff --git a/src/utils/proxy_child.rs b/src/utils/proxy_child.rs
new file mode 100644
index 0000000..d7a021d
--- /dev/null
+++ b/src/utils/proxy_child.rs
@@ -0,0 +1,74 @@
+use std::process::{Child as ChildProcess, Command};
+use std::rc::Rc;
+
+use hyper::http::uri::Scheme;
+use hyper::{header, Body, Client, Request, Response};
+use rhai::{Dynamic, FnPtr, Map};
+
+pub struct KillOnDrop(ChildProcess);
+
+impl Drop for KillOnDrop {
+    fn drop(&mut self) {
+        self.0.kill().unwrap();
+    }
+}
+
+#[derive(Clone)]
+pub struct ProxyChild {
+    process: Rc<KillOnDrop>,
+    port: u16,
+}
+
+impl ProxyChild {
+    fn new(params: Map) -> Self {
+        let command_line = params["command"].clone().into_immutable_string().unwrap();
+        let port = params["port"].as_int().unwrap();
+        let mut command_line = command_line.split(" ");
+        let command = command_line.next().unwrap();
+        let mut child = Command::new(command);
+        child.args(command_line);
+        if let Some(cwd) = params.get("in_dir") {
+            let cwd = cwd.clone().into_immutable_string().unwrap();
+            let cwd: &str = cwd.as_ref();
+            child.current_dir(cwd);
+        }
+        let child = child.spawn().unwrap();
+        Self {
+            process: Rc::new(KillOnDrop(child)),
+            port: port as u16,
+        }
+    }
+}
+
+pub fn handle_request(child: &mut ProxyChild, request: Rc<Request<Body>>) -> Rc<Response<Body>> {
+    let ProxyChild { port, .. } = child;
+    let mut request_uri = request.uri().clone().into_parts();
+    // TODO ipv6 loopback?
+    request_uri.authority = Some(format!("127.0.0.1:{}", port).parse().unwrap());
+    request_uri.scheme = Some(Scheme::HTTP);
+    let mut proxy_request = Request::builder()
+        .method(request.method())
+        .uri(request_uri)
+        .header(header::HOST, request.headers()[header::HOST].clone());
+    proxy_request.headers_mut().unwrap().extend(
+        request
+            .headers()
+            .iter()
+            .map(|(x, y)| (x.clone(), y.clone())),
+    );
+    // TODO handle nonempty body
+    let proxy_request = proxy_request.body(Body::empty()).unwrap();
+    let response = async {
+        let client = Client::new();
+        Rc::new(client.request(proxy_request).await.unwrap())
+    };
+    let runtime = tokio::runtime::Handle::current();
+    runtime.block_on(response)
+}
+
+pub fn proxy_child(params: Map) -> FnPtr {
+    let child = ProxyChild::new(params);
+    let mut result = FnPtr::new("handle_request_proxy_child").unwrap();
+    result.add_curry(Dynamic::from(child));
+    result
+}
diff --git a/src/utils/serve_static.rs b/src/utils/serve_static.rs
new file mode 100644
index 0000000..2ec0a90
--- /dev/null
+++ b/src/utils/serve_static.rs
@@ -0,0 +1,75 @@
+use std::fs::File;
+use std::io::{ErrorKind, Read};
+use std::path::PathBuf;
+use std::rc::Rc;
+
+use hyper::{Body, Request, Response, StatusCode};
+use rhai::{Dynamic, FnPtr, Map};
+
+#[derive(Clone, Debug)]
+pub struct Params {
+    root: PathBuf,
+}
+
+#[derive(Debug)]
+pub struct KeyError(&'static str);
+
+impl TryFrom<Map> for Params {
+    type Error = KeyError;
+
+    fn try_from(mut value: Map) -> Result<Self, Self::Error> {
+        let root = value
+            .remove("root")
+            .and_then(|value| value.into_immutable_string().ok())
+            .ok_or(KeyError("root"))?;
+        let root: PathBuf = root.parse().unwrap();
+        let root = root.canonicalize().unwrap();
+        Ok(Self { root })
+    }
+}
+
+pub fn handle_request(params: &mut Params, request: Rc<Request<Body>>) -> Rc<Response<Body>> {
+    let Params { root } = params;
+    eprintln!("handling request {:?}", request);
+    let request_path = request.uri().path();
+    let request_path = request_path.trim_start_matches("/");
+    let target = root.join(request_path);
+    let target = if target.is_dir() {
+        target.join("index.html")
+    } else {
+        target
+    };
+    eprintln!("target is {}", target.display());
+    let response = if target.ancestors().all(|ancestor| ancestor != root) {
+        // oops! all directory traversal
+        Response::builder()
+            .status(StatusCode::BAD_REQUEST)
+            .body(Body::empty())
+    } else {
+        let file = File::open(target);
+        match file {
+            Ok(mut file) => {
+                let mut result = Vec::new();
+                file.read_to_end(&mut result).unwrap();
+                Response::builder().body(Body::from(result))
+            }
+            Err(err) => {
+                let status_code = match err.kind() {
+                    ErrorKind::NotFound => StatusCode::NOT_FOUND,
+                    _ => StatusCode::BAD_REQUEST,
+                };
+                Response::builder()
+                    .status(status_code)
+                    .body(Body::from(status_code.canonical_reason().unwrap_or("")))
+            }
+        }
+    };
+    Rc::new(response.unwrap())
+}
+
+pub fn serve_static(params: Map) -> FnPtr {
+    let params: Params = params.try_into().unwrap();
+    let mut result = FnPtr::new("handle_request_serve_static").unwrap();
+    result.add_curry(Dynamic::from(params));
+    result
+}
author	Melody Horn <melody@boringcactus.com>	2021-11-12 22:38:39 -0700
committer	Melody Horn <melody@boringcactus.com>	2021-11-12 22:38:39 -0700
commit	f79b75710167088e2031a82a94a8d127fbb16a1f (patch)
tree	ffbbd167c34864d92b1d1e0a3b40da77e0b06874 /src
parent	fad6b7b755b788ca0d9113999faa8fb0d6f89ad0 (diff)
download	narchttpd-f79b75710167088e2031a82a94a8d127fbb16a1f.tar.gz narchttpd-f79b75710167088e2031a82a94a8d127fbb16a1f.zip