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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::{database::Database, federation::Federation};
use anyhow::{anyhow, Result};
use jellybase::CONF;
use jellycommon::{stream::StreamSpec, MediaSource};
use log::{info, warn};
use rocket::{
get,
http::{ContentType, Header, Status},
request::{self, FromRequest},
response::{self, Redirect, Responder},
Either, Request, Response, State,
};
use std::{ops::Range, time::Duration};
use tokio::io::DuplexStream;
#[get("/n/<id>/stream?<spec>")]
pub async fn r_stream(
_sess: Session,
federation: &State<Federation>,
db: &State<Database>,
id: String,
range: Option<RequestRange>,
spec: StreamSpec,
) -> Result<Either<StreamResponse, Redirect>, MyError> {
let node = db.node.get(&id)?.ok_or(anyhow!("node does not exist"))?;
let source = node
.private
.source
.as_ref()
.ok_or(anyhow!("item does not contain media"))?;
if let MediaSource::Remote { host, remote_id } = source {
let (username, password, _) = CONF
.remote_credentials
.get(host)
.ok_or(anyhow!("no credentials on the server-side"))?;
let instance = federation.get_instance(&host)?.to_owned();
let session = instance
.login(
username.to_owned(),
password.to_owned(),
Duration::from_secs(60),
)
.await?;
let uri = session.stream(&remote_id, &spec);
return Ok(Either::Right(Redirect::found(uri)));
}
info!(
"stream request (range={})",
range
.as_ref()
.map(|r| r.to_cr_hv())
.unwrap_or(format!("none"))
);
let urange = match &range {
Some(r) => {
let r = r.0.get(0).unwrap_or(&(None..None));
r.start.unwrap_or(0)..r.end.unwrap_or(isize::MAX as usize)
}
None => 0..(isize::MAX as usize),
};
match jellystream::stream(node, spec, urange).await {
Ok(stream) => Ok(Either::Left(StreamResponse { stream, range })),
Err(e) => {
warn!("stream error: {e}");
Err(MyError(e))
}
}
}
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(Status::Ok),
}
}
}
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