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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2023 metamuffin <metamuffin.org>
*/
use super::ui::{account::session::Session, error::MyError};
use crate::library::Library;
use anyhow::{anyhow, Context, Result};
use jellyremuxer::RemuxerContext;
use log::{debug, info, warn};
use rocket::{
get,
http::{ContentType, Header, Status},
request::{self, FromRequest},
response::{self, Responder},
Request, Response, State,
};
use std::{
ops::{Deref, Range},
path::{Path, PathBuf},
};
use tokio::io::{duplex, DuplexStream};
use tokio_util::io::SyncIoBridge;
pub fn stream_uri(path: &Path, tracks: &[u64], webm: bool) -> String {
format!(
"/stream/{}?tracks={}&webm={}",
path.to_str().unwrap(),
tracks
.iter()
.map(|v| format!("{v}"))
.collect::<Vec<_>>()
.join(","),
if webm { "1" } else { "0" }
)
}
#[get("/stream/<path..>?<tracks>&<webm>")]
pub fn r_stream(
_sess: Session,
path: PathBuf,
webm: Option<bool>,
tracks: String,
remuxer: &State<RemuxerContext>,
library: &State<Library>,
range: Option<RequestRange>,
) -> Result<StreamResponse, MyError> {
info!(
"stream request (range={})",
range
.as_ref()
.map(|r| r.to_cr_hv())
.unwrap_or(format!("none"))
);
let (a, b) = duplex(1024);
let path = path.to_str().unwrap().to_string();
let item = library
.nested(&path)
.context("retrieving library node")?
.get_item()?;
let remuxer = remuxer.deref().clone();
let tracks = tracks
.split(',')
.map(|e| e.parse().map_err(|_| anyhow!("invalid number")))
.collect::<Result<Vec<_>, _>>()?;
let b = SyncIoBridge::new(b);
let urange = match &range {
Some(r) => {
// TODO this can crash
let r = &r.0[0];
r.start.unwrap_or(0)..r.end.unwrap_or(isize::MAX as usize)
}
None => 0..(isize::MAX as usize),
};
tokio::task::spawn_blocking(move || {
if let Err(e) = remuxer.generate_into(
b,
urange,
item.fs_path.parent().unwrap().to_path_buf(),
item.info.clone(),
tracks,
webm.unwrap_or(false),
) {
warn!("stream stopped: {e}")
}
});
debug!("starting stream");
Ok(StreamResponse { stream: a, range })
}
pub struct StreamResponse {
stream: DuplexStream,
range: Option<RequestRange>,
}
#[rocket::async_trait]
impl<'r> Responder<'r, 'static> for StreamResponse {
fn respond_to(self, _: &'r Request<'_>) -> response::Result<'static> {
let mut b = Response::build();
if let Some(range) = self.range {
b.status(Status::PartialContent);
b.header(Header::new("content-range", range.to_cr_hv()));
}
b.header(Header::new("accept-ranges", "bytes"))
.header(ContentType::WEBM)
.streamed_body(self.stream)
.ok()
}
}
#[derive(Debug)]
pub struct RequestRange(Vec<Range<Option<usize>>>);
impl RequestRange {
pub fn to_cr_hv(&self) -> String {
assert_eq!(self.0.len(), 1);
format!(
"bytes {}-{}/*",
self.0[0]
.start
.map(|e| format!("{e}"))
.unwrap_or(String::new()),
self.0[0]
.end
.map(|e| format!("{e}"))
.unwrap_or(String::new())
)
}
pub fn from_hv(s: &str) -> Result<Self> {
Ok(Self(
s.strip_prefix("bytes=")
.ok_or(anyhow!("prefix expected"))?
.split(',')
.map(|s| {
let (l, r) = s
.split_once('-')
.ok_or(anyhow!("range delimeter missing"))?;
let km = |s: &str| {
if s.is_empty() {
Ok::<_, anyhow::Error>(None)
} else {
Ok(Some(s.parse()?))
}
};
Ok(km(l)?..km(r)?)
})
.collect::<Result<Vec<_>>>()?,
))
}
}
#[rocket::async_trait]
impl<'r> FromRequest<'r> for RequestRange {
type Error = anyhow::Error;
async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, Self::Error> {
match req.headers().get("range").next() {
Some(v) => match Self::from_hv(v) {
Ok(v) => rocket::outcome::Outcome::Success(v),
Err(e) => rocket::outcome::Outcome::Failure((Status::BadRequest, e)),
},
None => rocket::outcome::Outcome::Forward(()),
}
}
}
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