57 lines
2.0 KiB
C#
57 lines
2.0 KiB
C#
using Musify.Application.Configuration;
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using Musify.Application.Contracts;
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using Musify.Application.Tracks.Responses;
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using Musify.Domain.Entities;
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namespace Musify.Application.Services;
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public sealed class TrackStreamIssuer(
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IDatabase database,
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IStreamTicketService ticketService,
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TrackConfiguration trackConfiguration,
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StreamGatewayConfiguration streamGatewayConfiguration,
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PlaybackConfiguration playbackConfiguration)
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{
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public async Task<TrackStreamResponse> IssueAsync(
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Guid trackId,
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string audioFolderName,
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long? userId,
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CancellationToken cancellationToken)
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{
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var folderPath = trackConfiguration.Routes.BuildProcessedAudioPath(audioFolderName);
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var keyPrefix = $"{folderPath}/";
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var maxBytes = AnonymousFragmentBytes(userId);
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var ticket = ticketService.IssueTicket(userId, keyPrefix, maxBytes);
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var manifestUrl = string.Join('/',
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streamGatewayConfiguration.PublicBaseUrl.TrimEnd('/'),
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"media",
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folderPath,
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streamGatewayConfiguration.AudioFileName);
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// Anonymous listeners have no User row to satisfy ListeningHistory's foreign key against, and
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// their plays aren't "history" anyone can look back on anyway, so there's nothing to record.
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if (userId != null)
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{
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var newListeningHistory = new ListeningHistory
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{
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UserId = userId.Value,
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TrackId = trackId,
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};
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await database.ListeningHistories.AddAsync(newListeningHistory, cancellationToken);
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await database.SaveChangesAsync(cancellationToken);
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}
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return new TrackStreamResponse(manifestUrl, ticket.Token, ticket.ExpiresInSeconds);
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}
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private long? AnonymousFragmentBytes(long? userId)
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{
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if (userId != null || playbackConfiguration.AnonymousFragmentSeconds <= 0)
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return null;
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return (long)playbackConfiguration.AnonymousFragmentSeconds * playbackConfiguration.EstimatedAudioBytesPerSecond;
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}
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}
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