use std::{borrow::Cow, convert::Infallible, net::SocketAddr, sync::Arc}; use futures::future::Future; use hyper::{ header::HOST, server::conn::AddrStream, service::{make_service_fn, service_fn}, Body, Method, Request, Response, Server, }; use idna::domain_to_unicode; use crate::error::*; use garage_api::s3_get::{handle_get, handle_head}; use garage_model::bucket_table::*; use garage_model::garage::Garage; use garage_table::*; use garage_util::error::Error as GarageError; /// Run a web server pub async fn run_web_server( garage: Arc<Garage>, shutdown_signal: impl Future<Output = ()>, ) -> Result<(), GarageError> { let addr = &garage.config.s3_web.bind_addr; let service = make_service_fn(|conn: &AddrStream| { let garage = garage.clone(); let client_addr = conn.remote_addr(); async move { Ok::<_, Error>(service_fn(move |req: Request<Body>| { let garage = garage.clone(); handle_request(garage, req, client_addr) })) } }); let server = Server::bind(&addr).serve(service); let graceful = server.with_graceful_shutdown(shutdown_signal); info!("Web server listening on http://{}", addr); graceful.await?; Ok(()) } async fn handle_request( garage: Arc<Garage>, req: Request<Body>, addr: SocketAddr, ) -> Result<Response<Body>, Infallible> { info!("{} {} {}", addr, req.method(), req.uri()); let res = serve_file(garage, req).await; match &res { Ok(r) => debug!("{} {:?}", r.status(), r.headers()), Err(e) => warn!("Response: error {}, {}", e.http_status_code(), e), } Ok(res.unwrap_or_else(error_to_res)) } fn error_to_res(e: Error) -> Response<Body> { let body: Body = Body::from(format!("{}\n", e)); let mut http_error = Response::new(body); *http_error.status_mut() = e.http_status_code(); http_error } async fn serve_file(garage: Arc<Garage>, req: Request<Body>) -> Result<Response<Body>, Error> { // Get http authority string (eg. [::1]:3902 or garage.tld:80) let authority = req .headers() .get(HOST) .ok_or(Error::BadRequest(format!("HOST header required")))? .to_str()?; // Get bucket let (host, _) = domain_to_unicode(authority_to_host(authority)?); let root = &garage.config.s3_web.root_domain; let bucket = host_to_bucket(&host, root); // Check bucket is exposed as a website let bucket_desc = garage .bucket_table .get(&EmptyKey, &bucket.to_string()) .await? .filter(|b| !b.is_deleted()) .ok_or(Error::NotFound)?; match bucket_desc.state.get() { BucketState::Present(params) if *params.website.get() => Ok(()), _ => Err(Error::NotFound), }?; // Get path let path = req.uri().path().to_string(); let index = &garage.config.s3_web.index; let key = path_to_key(&path, &index)?; info!("Selected bucket: \"{}\", selected key: \"{}\"", bucket, key); let res = match req.method() { &Method::HEAD => handle_head(garage, &req, &bucket, &key).await?, &Method::GET => handle_get(garage, &req, bucket, &key).await?, _ => return Err(Error::BadRequest(format!("HTTP method not supported"))), }; Ok(res) } /// Extract host from the authority section given by the HTTP host header /// /// The HTTP host contains both a host and a port. /// Extracting the port is more complex than just finding the colon (:) symbol due to IPv6 /// We do not use the collect pattern as there is no way in std rust to collect over a stack allocated value /// check here: https://docs.rs/collect_slice/1.2.0/collect_slice/ fn authority_to_host(authority: &str) -> Result<&str, Error> { let mut iter = authority.chars().enumerate(); let (_, first_char) = iter .next() .ok_or(Error::BadRequest(format!("Authority is empty")))?; let split = match first_char { '[' => { let mut iter = iter.skip_while(|(_, c)| c != &']'); match iter.next() { Some((_, ']')) => iter.next(), _ => { return Err(Error::BadRequest(format!( "Authority {} has an illegal format", authority ))) } } } _ => iter.skip_while(|(_, c)| c != &':').next(), }; match split { Some((i, ':')) => Ok(&authority[..i]), None => Ok(authority), Some((_, _)) => Err(Error::BadRequest(format!( "Authority {} has an illegal format", authority ))), } } /// Host to bucket /// /// Convert a host, like "bucket.garage-site.tld" or "john.doe.com" /// to the corresponding bucket, resp. "bucket" and "john.doe.com" /// considering that ".garage-site.tld" is the "root domain". /// This behavior has been chosen to follow AWS S3 semantic. fn host_to_bucket<'a>(host: &'a str, root: &str) -> &'a str { if root.len() >= host.len() || !host.ends_with(root) { return host; } let len_diff = host.len() - root.len(); let missing_starting_dot = root.chars().next() != Some('.'); let cursor = if missing_starting_dot { len_diff - 1 } else { len_diff }; &host[..cursor] } /// Path to key /// /// Convert the provided path to the internal key /// When a path ends with "/", we append the index name to match traditional web server behavior /// which is also AWS S3 behavior. fn path_to_key<'a>(path: &'a str, index: &str) -> Result<Cow<'a, str>, Error> { let path_utf8 = percent_encoding::percent_decode_str(&path).decode_utf8()?; if path_utf8.chars().next() != Some('/') { return Err(Error::BadRequest(format!( "Path must start with a / (slash)" ))); } match path_utf8.chars().last() { None => unreachable!(), Some('/') => { let mut key = String::with_capacity(path_utf8.len() + index.len()); key.push_str(&path_utf8[1..]); key.push_str(index); Ok(key.into()) } Some(_) => match path_utf8 { Cow::Borrowed(pu8) => Ok((&pu8[1..]).into()), Cow::Owned(pu8) => Ok((&pu8[1..]).to_string().into()), }, } } #[cfg(test)] mod tests { use super::*; #[test] fn authority_to_host_with_port() -> Result<(), Error> { let domain = authority_to_host("[::1]:3902")?; assert_eq!(domain, "[::1]"); let domain2 = authority_to_host("garage.tld:65200")?; assert_eq!(domain2, "garage.tld"); let domain3 = authority_to_host("127.0.0.1:80")?; assert_eq!(domain3, "127.0.0.1"); Ok(()) } #[test] fn authority_to_host_without_port() -> Result<(), Error> { let domain = authority_to_host("[::1]")?; assert_eq!(domain, "[::1]"); let domain2 = authority_to_host("garage.tld")?; assert_eq!(domain2, "garage.tld"); let domain3 = authority_to_host("127.0.0.1")?; assert_eq!(domain3, "127.0.0.1"); assert!(authority_to_host("[").is_err()); assert!(authority_to_host("[hello").is_err()); Ok(()) } #[test] fn host_to_bucket_test() { assert_eq!( host_to_bucket("john.doe.garage.tld", ".garage.tld"), "john.doe" ); assert_eq!( host_to_bucket("john.doe.garage.tld", "garage.tld"), "john.doe" ); assert_eq!(host_to_bucket("john.doe.com", "garage.tld"), "john.doe.com"); assert_eq!( host_to_bucket("john.doe.com", ".garage.tld"), "john.doe.com" ); assert_eq!(host_to_bucket("garage.tld", "garage.tld"), "garage.tld"); assert_eq!(host_to_bucket("garage.tld", ".garage.tld"), "garage.tld"); } #[test] fn path_to_key_test() -> Result<(), Error> { assert_eq!(path_to_key("/file%20.jpg", "index.html")?, "file .jpg"); assert_eq!(path_to_key("/%20t/", "index.html")?, " t/index.html"); assert_eq!(path_to_key("/", "index.html")?, "index.html"); assert_eq!(path_to_key("/hello", "index.html")?, "hello"); assert!(path_to_key("", "index.html").is_err()); assert!(path_to_key("i/am/relative", "index.html").is_err()); Ok(()) } }