Files
Musify/backend/Core/Musify.Application/Tracks/GetTrackStream.cs
T
Admin 356e5c1101 Add anonymous playback with an optional Spotify-style preview cap
New Playback:AllowAnonymousListening / Playback:AnonymousFragmentSeconds
settings control whether a request without a session can stream at all,
and if so, whether it's limited to a fragment instead of the full track:

- GET /tracks/{id}/stream and GET /youtube/tracks/{videoId}/stream no
  longer require authorization outright; the handlers gate on the config
  instead, so both keep working exactly as before when it's off (the
  default).
- The fragment cap is enforced by the Streaming Gateway, not the client:
  the stream ticket now carries an optional maxBytes claim (computed from
  AnonymousFragmentSeconds and the transcoder's known bitrate), and
  TicketValidationMiddleware clamps the Range it forwards to SeaweedFS to
  stay under it — synthesizing one if the request didn't send one, and
  answering 416 outright if the requested range starts past the cap.
- A YouTube track that hasn't been provisioned server-side yet streams
  straight from YouTube's CDN, bypassing the Gateway entirely — there's no
  way to cap that, so an anonymous request for one is refused (409) instead
  of silently handing out an uncapped stream.
- ListeningHistory has a non-nullable UserId, so anonymous plays simply
  don't get recorded rather than trying to force a row through the FK.

Also fixes a real, pre-existing bug this surfaced: the AppSettings.Development.json
of the Api, Worker, and StreamingGateway all pointed StreamTicket/Workers
paths at "../../deploy/..." — one directory short of deploy/'s actual
location at the repo root relative to each project's own folder. Docker
never hit this (it mounts an absolute /keys path), so it had apparently
never been exercised via `dotnet run` before.
2026-09-10 09:56:57 +02:00

51 lines
2.1 KiB
C#

using ErrorOr;
using Mediator;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Musify.Application.Configuration;
using Musify.Application.Contracts;
using Musify.Application.Services;
using Musify.Application.Tracks.Responses;
namespace Musify.Application.Tracks
{
/// <param name="UserId">Null for an anonymous request — allowed only when
/// <see cref="PlaybackConfiguration.AllowAnonymousListening"/> is enabled.</param>
public record GetTrackStreamQuery(Guid TrackId, long? UserId)
: IQuery<ErrorOr<TrackStreamResponse>>;
public class GetTrackStreamQueryHandler(
IDatabase database,
TrackStreamIssuer streamIssuer,
PlaybackConfiguration playbackConfiguration,
ILogger<GetTrackStreamQueryHandler> logger)
: IQueryHandler<GetTrackStreamQuery, ErrorOr<TrackStreamResponse>>
{
public async ValueTask<ErrorOr<TrackStreamResponse>> Handle(GetTrackStreamQuery request, CancellationToken cancellationToken)
{
if (request.UserId is null && !playbackConfiguration.AllowAnonymousListening)
return Error.Unauthorized(description: "Sign in to stream music, or ask an administrator to enable anonymous listening.");
var track = await database.Tracks.AsNoTracking()
.Where(t => t.Id == request.TrackId)
.Select(t => new { t.Id, t.Audio })
.SingleOrDefaultAsync(cancellationToken);
if (track == null)
return Error.NotFound();
if (!track.Audio.IsProcessed)
{
logger.LogInformation("Stream requested for track {TrackId} but audio is not ready", request.TrackId);
return Error.Conflict(description: "Track audio is not available for streaming yet.");
}
var response = await streamIssuer.IssueAsync(track.Id, track.Audio.FolderName, request.UserId, cancellationToken);
logger.LogInformation("Issued stream ticket for track {TrackId} to user {UserId}", request.TrackId, request.UserId?.ToString() ?? "(anonymous)");
return response;
}
}
}