From f79b75710167088e2031a82a94a8d127fbb16a1f Mon Sep 17 00:00:00 2001 From: Melody Horn Date: Fri, 12 Nov 2021 22:38:39 -0700 Subject: god is dead and we have killed him. --- src/utils/proxy_child.rs | 74 ++++++++++++++++++++++++++++++++++++++++++++++ src/utils/serve_static.rs | 75 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 149 insertions(+) create mode 100644 src/utils/proxy_child.rs create mode 100644 src/utils/serve_static.rs (limited to 'src/utils') 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, + 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>) -> Rc> { + 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 for Params { + type Error = KeyError; + + fn try_from(mut value: Map) -> Result { + 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>) -> Rc> { + 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 +} -- cgit v1.2.3