move files around

1 files changed, 246 insertions, 0 deletions

diff --git a/server/src/logic/stream.rs b/server/src/logic/stream.rs
new file mode 100644
index 0000000..5bba9c2
--- /dev/null
+++ b/server/src/logic/stream.rs
@@ -0,0 +1,246 @@
+/*
+    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) 2025 metamuffin <metamuffin.org>
+*/
+use super::session::Session;
+use crate::{database::Database, ui::error::MyError};
+use anyhow::{anyhow, Result};
+use jellybase::{assetfed::AssetInner, federation::Federation};
+use jellycommon::{stream::StreamSpec, TrackSource};
+use jellystream::SMediaInfo;
+use log::{info, warn};
+use rocket::{
+    get, head,
+    http::{Header, Status},
+    request::{self, FromRequest},
+    response::{self, Redirect, Responder},
+    Either, Request, Response, State,
+};
+use std::{
+    collections::{BTreeMap, BTreeSet},
+    ops::Range,
+    sync::Arc,
+};
+use tokio::io::{duplex, DuplexStream};
+
+#[head("/n/<_id>/stream?<spec..>")]
+pub async fn r_stream_head(
+    _sess: Session,
+    _id: &str,
+    spec: BTreeMap<String, String>,
+) -> Result<Either<StreamResponse, Redirect>, MyError> {
+    let spec = StreamSpec::from_query_kv(&spec).map_err(|x| anyhow!("spec invalid: {x}"))?;
+    let head = jellystream::stream_head(&spec);
+    Ok(Either::Left(StreamResponse {
+        stream: duplex(0).0,
+        advertise_range: head.range_supported,
+        content_type: head.content_type,
+        range: None,
+    }))
+}
+
+#[get("/n/<id>/stream?<spec..>")]
+pub async fn r_stream(
+    _session: Session,
+    _federation: &State<Federation>,
+    db: &State<Database>,
+    id: &str,
+    range: Option<RequestRange>,
+    spec: BTreeMap<String, String>,
+) -> Result<Either<StreamResponse, RedirectResponse>, MyError> {
+    let spec = StreamSpec::from_query_kv(&spec).map_err(|x| anyhow!("spec invalid: {x}"))?;
+    // TODO perm
+    let node = db
+        .get_node_slug(id)?
+        .ok_or(anyhow!("node does not exist"))?;
+
+    let media = Arc::new(
+        node.media
+            .clone()
+            .ok_or(anyhow!("item does not contain media"))?,
+    );
+
+    // TODO its unclear how requests with multiple tracks should be handled.
+    // if spec.track.len() == 1 {
+    //     let ti = spec.track[0];
+    //     if let TrackSource::Remote(remote_index) = media.tracks[ti].source {
+    //         session
+    //             .user
+    //             .permissions
+    //             .assert(&UserPermission::FederatedContent)?;
+
+    //         let track = &node.media.as_ref().ok_or(anyhow!("no media"))?.tracks[ti];
+    //         let host = track
+    //             .federated
+    //             .last()
+    //             .ok_or(anyhow!("federation inconsistent"))?;
+
+    //         let FederationAccount {
+    //             password, username, ..
+    //         } = SECRETS
+    //             .federation
+    //             .get(host)
+    //             .ok_or(anyhow!("no credentials on the server-side"))?;
+
+    //         info!("creating session on {host}");
+    //         let instance = federation.get_instance(host)?.to_owned();
+    //         let session = instance
+    //             .login(CreateSessionParams {
+    //                 username: username.to_owned(),
+    //                 password: password.to_owned(),
+    //                 expire: Some(60),
+    //                 drop_permissions: Some(HashSet::from_iter([
+    //                     UserPermission::ManageSelf,
+    //                     UserPermission::Admin, // in case somebody federated the admin :)))
+    //                 ])),
+    //             })
+    //             .await?;
+
+    //         let uri = session.stream_url(
+    //             node.slug.clone().into(),
+    //             &StreamSpec {
+    //                 track: vec![remote_index],
+    //                 ..spec
+    //             },
+    //         );
+    //         info!("federation redirect");
+    //         return Ok(Either::Right(RedirectResponse(uri)));
+    //     }
+    // }
+
+    info!(
+        "stream request (range={})",
+        range
+            .as_ref()
+            .map(|r| r.to_cr_hv())
+            .unwrap_or("none".to_string())
+    );
+
+    let urange = match &range {
+        Some(r) => {
+            let r = r.0.first().unwrap_or(&(None..None));
+            r.start.unwrap_or(0)..r.end.unwrap_or(isize::MAX as usize)
+        }
+        None => 0..(isize::MAX as usize),
+    };
+
+    let head = jellystream::stream_head(&spec);
+
+    let mut sources = BTreeSet::new();
+    for t in &media.tracks {
+        if let TrackSource::Local(x) = &t.source {
+            if let AssetInner::LocalTrack(m) = AssetInner::deser(&x.0)? {
+                sources.insert(m.path);
+            }
+        }
+    }
+    let media = Arc::new(SMediaInfo {
+        files: sources,
+        info: node,
+    });
+
+    match jellystream::stream(media, spec, urange).await {
+        Ok(stream) => Ok(Either::Left(StreamResponse {
+            stream,
+            range,
+            advertise_range: head.range_supported,
+            content_type: head.content_type,
+        })),
+        Err(e) => {
+            warn!("stream error: {e}");
+            Err(MyError(e))
+        }
+    }
+}
+
+pub struct RedirectResponse(String);
+
+#[rocket::async_trait]
+impl<'r> Responder<'r, 'static> for RedirectResponse {
+    fn respond_to(self, _: &'r Request<'_>) -> response::Result<'static> {
+        let mut b = Response::build();
+        b.status(Status::Found);
+        b.header(Header::new("access-control-allow-origin", "*"));
+        b.header(Header::new("location", self.0));
+        Ok(b.finalize())
+    }
+}
+
+pub struct StreamResponse {
+    stream: DuplexStream,
+    advertise_range: bool,
+    content_type: &'static str,
+    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();
+        b.status(Status::Ok);
+        b.header(Header::new("access-control-allow-origin", "*"));
+        if self.advertise_range {
+            //* it is very important here to not reply with content range if we didnt advertise.
+            //* mpv requests range but will crash if we dont pretend to not support it.
+            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"));
+        }
+        b.header(Header::new("content-type", self.content_type))
+            .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| e.to_string()).unwrap_or_default(),
+            self.0[0].end.map(|e| e.to_string()).unwrap_or_default()
+        )
+    }
+    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::Error((Status::BadRequest, e)),
+            },
+            None => rocket::outcome::Outcome::Forward(Status::Ok),
+        }
+    }
+}