code/api/Endpoints/Storage/TreeEndpoint.cs


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namespace I2R.Storage.Api.Endpoints.Storage;

public class TreeEndpoint : EndpointBase
{
    private readonly AppDatabase _database;
    private readonly IPaginationService _pagination;

    public TreeEndpoint(AppDatabase database, IPaginationService pagination) {
        _database = database;
        _pagination = pagination;
    }

    [HttpGet("~/storage/tree")]
    public async Task<ActionResult<KeysetPaginationResult<FileSystemEntry>>> Handle(Guid parent = default) {
        return Ok(await _pagination.KeysetPaginateAsync(
            _database.Folders.Include(c => c.Files).ConditionalWhere(() => parent != default, folder => folder.ParentId == parent),
            b => b.Descending(a => a.Name),
            async id => await _database.Folders.FirstOrDefaultAsync(c => c.Id == id.AsGuid()),
            query => query.Select(p => new FileSystemEntry() {
                Id = p.Id,
                Name = p.Name,
                MimeType = SystemConstants.FolderMimeType,
                SizeInBytes = -1,
                Files = p.Files.Select(c => new FileSystemEntry() {
                    Id = c.Id,
                    Name = c.Name,
                    MimeType = c.MimeType,
                    SizeInBytes = c.SizeInBytes
                }).ToList()
            })
        ));
    }
}