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Rewrite authority to host while staying on stack

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This commit is contained in:
Quentin 2020-11-10 15:26:48 +01:00
parent 27795a390c
commit 1e52ee9f5b
1 changed files with 21 additions and 20 deletions
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41
src/web/web_server.rs
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@ -6,7 +6,7 @@ use futures::future::Future;
use hyper::header::HOST;
use hyper::server::conn::AddrStream;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Request, Response, Server, Uri};
use hyper::{Body, Request, Response, Server};
use garage_model::garage::Garage;
use garage_util::error::Error;
@ -58,7 +58,7 @@ async fn handler(
let path = req.uri().path().to_string();
let key = percent_encoding::percent_decode_str(&path).decode_utf8()?;
info!("host: {}, bucket: {}, key: {}", host, bucket, key);
info!("Selected bucket: {}, selected key: {}", bucket, key);
Ok(Response::new(Body::from("hello world\n")))
}
@ -66,28 +66,29 @@ async fn handler(
/// 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.
/// An example of a case where it does not work: [::1]:3902
/// Instead, we use the Uri module provided by Hyper that correctl parses this "authority" section
fn authority_to_host(authority: &str) -> Result<String, Error> {
// Hyper can not directly parse authority section so we build a fake URL
// that contains our authority section
let mut uri_str: String = "fake://".to_owned();
uri_str.push_str(authority);
/// 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 split = match iter.next() {
Some((_, '[')) => {
let mut niter = iter.skip_while(|(_, c)| c != &']');
niter.next().ok_or(Error::BadRequest(format!("Authority {} has an illegal format", authority)))?;
niter.next()
},
Some((_, _)) => iter.skip_while(|(_, c)| c != &':').next(),
None => return Err(Error::BadRequest(format!("Authority is empty"))),
};
match uri_str.parse::<Uri>() {
Ok(uri) => {
let host = uri.host().ok_or(Error::BadRequest(format!(
"Unable to extract host from authority"
)))?;
Ok(String::from(host))
}
_ => Err(Error::BadRequest(format!(
"Unable to parse authority (host HTTP header)"
))),
match split {
Some((i, ':')) => Ok(&authority[..i]),
None => Ok(authority),
Some((_, _)) => Err(Error::BadRequest(format!("Authority {} has an illegal format", authority))),
}
}
fn host_to_bucket<'a>(host: &'a str, root: &str) -> &'a str {
if root.len() >= host.len() || !host.ends_with(root) {
return host;