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