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_else(|| Error::BadRequest("HOST header required".to_owned()))?
.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("HTTP method not supported".to_string())),
};
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_else(|| Error::BadRequest("Authority is empty".to_string()))?;
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.find(|(_, c)| *c == ':'),
};
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.starts_with('.');
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.starts_with('/') {
return Err(Error::BadRequest(
"Path must start with a / (slash)".to_string(),
));
}
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(())
}
}
