82 lines
2.8 KiB
C#
82 lines
2.8 KiB
C#
using System.Security.Cryptography;
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using Foxnouns.Backend.Database;
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using Foxnouns.Backend.Jobs;
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using Foxnouns.Backend.Services;
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using Foxnouns.Backend.Utils;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Formats.Webp;
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using SixLabors.ImageSharp.Processing;
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using SixLabors.ImageSharp.Processing.Processors.Transforms;
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namespace Foxnouns.Backend.Extensions;
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public static class ImageObjectExtensions
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{
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private static readonly string[] ValidContentTypes = ["image/png", "image/webp", "image/jpeg"];
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public static async Task DeleteMemberAvatarAsync(
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this ObjectStorageService objectStorageService,
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Snowflake id,
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string hash,
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CancellationToken ct = default
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) =>
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await objectStorageService.RemoveObjectAsync(
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MemberAvatarUpdateInvocable.Path(id, hash),
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ct
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);
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public static async Task DeleteUserAvatarAsync(
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this ObjectStorageService objectStorageService,
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Snowflake id,
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string hash,
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CancellationToken ct = default
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) => await objectStorageService.RemoveObjectAsync(UserAvatarUpdateInvocable.Path(id, hash), ct);
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public static async Task DeleteFlagAsync(
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this ObjectStorageService objectStorageService,
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string hash,
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CancellationToken ct = default
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) => await objectStorageService.RemoveObjectAsync(CreateFlagInvocable.Path(hash), ct);
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public static async Task<(string Hash, Stream Image)> ConvertBase64UriToImage(
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string uri,
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int size,
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bool crop
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)
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{
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if (!uri.StartsWith("data:image/"))
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throw new ArgumentException("Not a data URI", nameof(uri));
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var split = uri.Remove(0, "data:".Length).Split(";base64,");
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var contentType = split[0];
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var encoded = split[1];
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if (!ValidContentTypes.Contains(contentType))
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throw new ArgumentException("Invalid content type for image", nameof(uri));
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if (!AuthUtils.TryFromBase64String(encoded, out var rawImage))
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throw new ArgumentException("Invalid base64 string", nameof(uri));
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var image = Image.Load(rawImage);
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var processor = new ResizeProcessor(
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new ResizeOptions
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{
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Size = new Size(size),
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Mode = crop ? ResizeMode.Crop : ResizeMode.Max,
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Position = AnchorPositionMode.Center,
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},
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image.Size
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);
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image.Mutate(x => x.ApplyProcessor(processor));
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var stream = new MemoryStream(64 * 1024);
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await image.SaveAsync(stream, new WebpEncoder { Quality = 95, NearLossless = false });
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stream.Seek(0, SeekOrigin.Begin);
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var hash = Convert.ToHexString(await SHA256.HashDataAsync(stream)).ToLower();
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stream.Seek(0, SeekOrigin.Begin);
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return (hash, stream);
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}
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}
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