garage/src/web/web_server.rs

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Rust
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use std::{borrow::Cow, convert::Infallible, net::SocketAddr, sync::Arc};
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use futures::future::Future;
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use hyper::{
header::HOST,
server::conn::AddrStream,
service::{make_service_fn, service_fn},
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Body, Method, Request, Response, Server,
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};
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use crate::error::*;
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use garage_api::helpers::{authority_to_host, host_to_bucket};
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use garage_api::s3_get::{handle_get, handle_head};
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use garage_model::bucket_table::Bucket;
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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(
garage: Arc<Garage>,
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| {
let garage = garage.clone();
let client_addr = conn.remote_addr();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
let garage = garage.clone();
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handle_request(garage, req, client_addr)
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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);
info!("Web server listening on http://{}", addr);
graceful.await?;
Ok(())
}
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async fn handle_request(
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garage: Arc<Garage>,
req: Request<Body>,
addr: SocketAddr,
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) -> 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();
e.add_headers(http_error.headers_mut());
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http_error
}
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
.headers()
.get(HOST)
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.ok_or_else(|| Error::BadRequest("HOST header required".to_owned()))?
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.to_str()?;
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// Get bucket
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let host = authority_to_host(authority)?;
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let root = &garage.config.s3_web.root_domain;
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let bucket_name = host_to_bucket(&host, root).unwrap_or(&host);
let bucket_id = garage
.bucket_alias_table
.get(&EmptyKey, &bucket_name.to_string())
.await?
.map(|x| x.state.take())
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.flatten()
.ok_or(Error::NotFound)?;
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// Check bucket isn't deleted and has website access enabled
let _: Bucket = garage
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.bucket_table
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.get(&bucket_id, &EmptyKey)
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.await?
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.filter(|b| {
b.state
.as_option()
.map(|x| x.website_config.get().is_some())
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.unwrap_or(false)
})
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.ok_or(Error::NotFound)?;
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// Get path
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_name, bucket_id, key
);
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let res = match *req.method() {
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Method::HEAD => handle_head(garage, &req, bucket_id, &key).await?,
Method::GET => handle_get(garage, &req, bucket_id, &key).await?,
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_ => return Err(Error::BadRequest("HTTP method not supported".to_string())),
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};
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Ok(res)
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}
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/// 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> {
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let path_utf8 = percent_encoding::percent_decode_str(path).decode_utf8()?;
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if !path_utf8.starts_with('/') {
return Err(Error::BadRequest(
"Path must start with a / (slash)".to_string(),
));
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}
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match path_utf8.chars().last() {
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None => unreachable!(),
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Some('/') => {
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);
Ok(key.into())
}
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Some(_) => match path_utf8 {
Cow::Borrowed(pu8) => Ok((&pu8[1..]).into()),
Cow::Owned(pu8) => Ok((&pu8[1..]).to_string().into()),
},
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}
}
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#[cfg(test)]
mod tests {
use super::*;
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#[test]
fn path_to_key_test() -> Result<(), Error> {
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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");
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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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}