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use std::{collections::HashSet, convert::Infallible, net::SocketAddr, str::Chars, time::Instant};
use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine};
use bonsaidb::{
files::FileConfig,
server::{CustomServer, ServerDatabase},
};
use http::{
header::{CONTENT_LENGTH, IF_NONE_MATCH, LOCATION},
HeaderValue,
};
use hyper::{
header::{ALLOW, CONTENT_TYPE, ETAG},
server::conn::AddrStream,
service::{make_service_fn, service_fn},
Body, Method, Request, Response, StatusCode,
};
use mime_guess::MimeGuess;
use crate::{
schema::{DossierFiles, Metadata},
CliBackend,
};
pub(crate) fn launch(server: CustomServer<CliBackend>, dossier: ServerDatabase<CliBackend>) {
let make_service = make_service_fn(move |conn: &AddrStream| {
let server = server.clone();
let dossier = dossier.clone();
let peer_addr = conn.remote_addr();
async move {
Ok::<_, Infallible>(service_fn(move |req| {
get_page_with_error_handling(req, server.clone(), dossier.clone(), peer_addr)
}))
}
});
let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
let hyper = hyper::Server::bind(&addr).serve(make_service);
tokio::task::spawn(async move { hyper.await });
}
async fn get_page(
request: Request<Body>,
server: CustomServer<CliBackend>,
pages: ServerDatabase<CliBackend>,
peer_addr: SocketAddr,
) -> anyhow::Result<Response<Body>> {
if request.uri().path() == "/_ws" {
return Ok(server.upgrade_websocket(peer_addr, request).await);
}
let start = Instant::now();
let path = decode_escaped_path_components(request.uri().path())?;
let mut file = DossierFiles::load_async(&path, &pages).await?;
if file.is_none() {
file = DossierFiles::list_async(&path, &pages)
.await?
.into_iter()
.find(|file| file.name().starts_with("index."));
if file.is_some() && !path.ends_with('/') {
let (_, folder_name) = path.rsplit_once('/').unwrap_or(("", &path));
return Ok(Response::builder()
.header(LOCATION, format!("./{folder_name}/"))
.status(StatusCode::TEMPORARY_REDIRECT)
.body(Body::empty())?);
}
}
let mut file = match file {
Some(file) => file,
None => {
return Ok(Response::builder()
.status(StatusCode::NOT_FOUND)
.header("Server-Timing", server_timings_header(start))
.body(Body::from("Not found"))
.unwrap())
}
};
match request.method() {
&Method::GET => {
let (send_body, response) = construct_page_response(
&request,
mime_guess::from_path(file.name()),
file.metadata().as_ref(),
start,
);
if send_body {
let data = file.contents().await?;
Ok(response.body(Body::wrap_stream(data)).unwrap())
} else {
Ok(response.body(Body::empty()).unwrap())
}
}
&Method::HEAD => {
let (_, response) = construct_page_response(
&request,
mime_guess::from_path(file.name()),
file.metadata().as_ref(),
start,
);
Ok(response
.header(CONTENT_LENGTH, file.len().await?)
.body(Body::empty())
.unwrap())
}
&Method::OPTIONS => Ok(Response::builder()
.status(StatusCode::OK)
.header(ALLOW, "OPTIONS, GET, HEAD")
.body(Body::empty())
.unwrap()),
method => anyhow::bail!("unsupported method: {method:?}"),
}
}
fn server_timings_header(start: Instant) -> String {
format!("req;dur={:0.2}", start.elapsed().as_secs_f32() * 1_000.)
}
fn construct_page_response(
request: &Request<Body>,
mime_guess: MimeGuess,
metadata: Option<&Metadata>,
start: Instant,
) -> (bool, http::response::Builder) {
let (send_body, mut response) = match (request.headers().get(IF_NONE_MATCH), metadata) {
(Some(etags), Some(metadata))
if parse_etags(etags)
.unwrap_or_default()
.contains(&metadata.blake3) =>
{
(false, Response::builder().status(StatusCode::NOT_MODIFIED))
}
_ => (true, Response::builder().status(StatusCode::OK)),
};
if let Some(mime_type) = mime_guess.first_raw() {
response = response.header(CONTENT_TYPE, mime_type);
}
if let Some(metadata) = metadata {
response = response.header(ETAG, URL_SAFE_NO_PAD.encode(metadata.blake3));
}
response = response.header("Server-Timing", server_timings_header(start));
(send_body, response)
}
fn parse_etags(etags: &HeaderValue) -> Option<HashSet<[u8; 32]>> {
let etags = etags.to_str().ok()?;
let fields = etags.split(',');
let mut parsed_tags = HashSet::new();
for quoted_tag in fields {
let tag = quoted_tag.split('"').nth(1)?;
if let Ok(tag) = URL_SAFE_NO_PAD.decode(tag) {
if let Ok(tag) = tag.try_into() {
parsed_tags.insert(tag);
}
}
}
Some(parsed_tags)
}
async fn get_page_with_error_handling(
request: Request<Body>,
server: CustomServer<CliBackend>,
pages: ServerDatabase<CliBackend>,
peer_addr: SocketAddr,
) -> Result<Response<Body>, Infallible> {
Ok(get_page(request, server, pages, peer_addr)
.await
.unwrap_or_else(|err| {
Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(Body::from(format!("an error occurred: {err}").into_bytes()))
.unwrap()
}))
}
fn decode_escaped_path_components(path: &str) -> anyhow::Result<String> {
PercentDecoder {
chars: path.chars(),
}
.collect()
}
struct PercentDecoder<'a> {
chars: Chars<'a>,
}
impl<'a> Iterator for PercentDecoder<'a> {
type Item = anyhow::Result<char>;
fn next(&mut self) -> Option<Self::Item> {
match self.chars.next()? {
'%' => {
let mut hex = [0; 2];
hex[0] = match self.chars.next().map(u8::try_from) {
Some(Ok(ch)) => ch,
_ => return Some(Err(anyhow::anyhow!("invalid percent escape sequence"))),
};
hex[1] = match self.chars.next().map(u8::try_from) {
Some(Ok(ch)) => ch,
_ => return Some(Err(anyhow::anyhow!("invalid percent escape sequence"))),
};
match u8::from_str_radix(std::str::from_utf8(&hex).unwrap(), 16) {
Ok(b'/') => Some(Err(anyhow::anyhow!("/ is invalid in a path segment"))),
Ok(byte) => Some(Ok(char::from(byte))),
Err(err) => Some(Err(anyhow::anyhow!(err))),
}
}
'+' => Some(Ok(' ')),
other => Some(Ok(other)),
}
}
}