50 lines
2.0 KiB
C#
50 lines
2.0 KiB
C#
using ErrorOr;
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using Mediator;
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using Microsoft.EntityFrameworkCore;
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using MimeMapping;
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using Musify.Application.Configuration;
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using Musify.Application.Contracts;
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namespace Musify.Application.Albums
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{
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public record GetAlbumCoverQuery(Guid AlbumId, string Size)
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: IQuery<ErrorOr<AlbumCoverLocation>>;
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public record AlbumCoverLocation(string Bucket, string Key, string ContentType);
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public class GetAlbumCoverQueryHandler(
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IDatabase database,
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ApplicationStorageConfiguration storageConfiguration,
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AlbumConfiguration albumConfiguration)
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: IQueryHandler<GetAlbumCoverQuery, ErrorOr<AlbumCoverLocation>>
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{
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public async ValueTask<ErrorOr<AlbumCoverLocation>> Handle(GetAlbumCoverQuery request, CancellationToken cancellationToken)
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{
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var pictures = await database.Albums.AsNoTracking()
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.Where(a => a.Id == request.AlbumId)
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.Select(a => a.Pictures)
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.SingleOrDefaultAsync(cancellationToken);
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if (pictures == null)
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return Error.NotFound();
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var routes = albumConfiguration.Routes;
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var (name, key) = request.Size.ToLowerInvariant() switch
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{
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"small" => (pictures.SmallName, BuildKey(routes.BuildSmallPicturePath, pictures.SmallName)),
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"large" => (pictures.LargeName, BuildKey(routes.BuildLargePicturePath, pictures.LargeName)),
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_ => (pictures.MediumName, BuildKey(routes.BuildMediumPicturePath, pictures.MediumName))
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};
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if (string.IsNullOrEmpty(name) || string.IsNullOrEmpty(key))
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return Error.NotFound();
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var contentType = MimeUtility.GetMimeMapping(name);
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return new AlbumCoverLocation(storageConfiguration.Bucket, key, contentType);
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}
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private static string? BuildKey(Func<string, string> builder, string? name)
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=> string.IsNullOrEmpty(name) ? null : builder(name);
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}
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}
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