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using Microsoft.AspNetCore.Hosting;
using SixLabors.ImageSharp;
using System.IO;
using System.Threading.Tasks;
using Timeline.Helpers.Cache;
using Timeline.Models;
using Timeline.Services.Data;
namespace Timeline.Services.User.Avatar
{
// TODO! : Make this configurable.
public class DefaultUserAvatarProvider : IDefaultUserAvatarProvider
{
private readonly IETagGenerator _eTagGenerator;
private readonly string _avatarPath;
private CacheableDataDigest? _cacheDigest;
private ByteData? _cacheData;
public DefaultUserAvatarProvider(IWebHostEnvironment environment, IETagGenerator eTagGenerator)
{
_avatarPath = Path.Combine(environment.ContentRootPath, "default-avatar.png");
_eTagGenerator = eTagGenerator;
}
private async Task CheckAndInit()
{
var path = _avatarPath;
if (_cacheData == null || File.GetLastWriteTime(path) > _cacheDigest!.LastModified)
{
var data = await File.ReadAllBytesAsync(path);
_cacheDigest = new CacheableDataDigest(await _eTagGenerator.GenerateETagAsync(data), File.GetLastWriteTime(path));
Image.Identify(data, out var format);
_cacheData = new ByteData(data, format.DefaultMimeType);
}
}
public async Task<ICacheableDataDigest> GetDefaultAvatarDigest()
{
await CheckAndInit();
return _cacheDigest!;
}
public async Task<ByteData> GetDefaultAvatar()
{
await CheckAndInit();
return _cacheData!;
}
}
}
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