94 lines
3.9 KiB
C#
94 lines
3.9 KiB
C#
using MAX.Core.DependencyInjection;
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using MAX.Framework.Security;
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using MAX.Framework.Validation;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using Store.Modules.CloudProduct.Contracts;
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using Store.Modules.CloudProduct.Dtos;
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using Store.Modules.CloudProduct.Entities;
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using System.ComponentModel.DataAnnotations;
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using System.Text.Encodings.Web;
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using System.Text.Json;
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using System.Text.Unicode;
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namespace Store.Modules.CloudProduct.Services;
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/// <summary>商品检测业务入口，负责上传图片识别、MD5 缓存和当前用户的商品安全记录。</summary>
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public sealed class ProductInspectionService(IInspectionIntegration integration, ICurrentUser user, ImageAnalysisQuotaService imageAnalysisQuotaService,
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[FromKeyedServices("CloudProductConnection")] IFreeSql database,
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[FromKeyedServices("ProductInspectionAnalysisGate")] SemaphoreSlim gate,
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ILogger<ProductInspectionService> logger
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) : IScopedDependency
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{
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public const int MaxBytes = 10 * 1024 * 1024;
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// 缓存 JSON 保留中文原文，字符串中的引号和控制字符仍由序列化器转义。
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private static readonly JsonSerializerOptions CacheJsonOptions = new()
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{
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Encoder = JavaScriptEncoder.Create(UnicodeRanges.All)
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};
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// 每三个图片字节编码为四个 Base64 字符，末组向上取整。
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public const int MaxBase64Length = (MaxBytes + 2) / 3 * 4;
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public async Task<string[]> InspectAsync(InspectImageRequest request, CancellationToken cancellationToken)
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{
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RequestValidator.Validate(request);
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if (request.Md5.Length != 32 || !request.Md5.All(char.IsAsciiHexDigit))
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throw new ValidationException("md5 必须是 32 位十六进制缓存键。");
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var md5 = request.Md5.ToLowerInvariant();
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if (request.Image.Length > MaxBase64Length)
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throw new ValidationException("图片超过 10 MiB 或 Base64 文本过长。");
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byte[] image;
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try { image = Convert.FromBase64String(request.Image); }
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catch (FormatException) { throw new ValidationException("image 必须是有效的 Base64 字符串。"); }
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if (image.Length is < 12 or > MaxBytes)
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throw new ValidationException("图片为空、格式无效或超过 10 MiB。");
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// 依据文件签名识别允许的图片类型，避免信任客户端文件名和 MIME 类型。
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string mediaType;
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if (image[0] == 0xff && image[1] == 0xd8 && image[2] == 0xff) mediaType = "image/jpeg";
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else if (image.AsSpan(0, 8).SequenceEqual(new byte[] { 137, 80, 78, 71, 13, 10, 26, 10 })) mediaType = "image/png";
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else if (image.AsSpan(0, 4).SequenceEqual("RIFF"u8) && image.AsSpan(8, 4).SequenceEqual("WEBP"u8)) mediaType = "image/webp";
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else throw new ValidationException("请上传 JPEG、PNG 或 WebP 图片。");
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var cached = await database.Select<ImageAnalysisCache>().Where(x => x.CacheKey == md5).FirstAsync();
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string[] result;
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// 旧对象格式缺少逐项阅读顺序，重新识别成功后再覆盖。
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if (cached?.RecognitionResult.TrimStart().StartsWith('[') == true)
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result = JsonSerializer.Deserialize<string[]>(cached.RecognitionResult)!;
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else
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{
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await gate.WaitAsync(cancellationToken);
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try
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{
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using var stream = new MemoryStream(image, writable: false);
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var recognized = await integration.AnalyzeAsync(stream, mediaType, cancellationToken);
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result = recognized.Distinct(StringComparer.Ordinal).ToArray();
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await database.InsertOrUpdate<ImageAnalysisCache>().SetSource(new ImageAnalysisCache
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{
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CacheKey = md5,
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RecognitionResult = JsonSerializer.Serialize(result, CacheJsonOptions),
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UpdatedAt = DateTime.UtcNow
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}).ExecuteAffrowsAsync();
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}
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finally { gate.Release(); }
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}
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try
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{
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var useRet = await imageAnalysisQuotaService.UseImageAnalysisQuotaAsync(new UseImageAnalysisQuotaRequest
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{
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UserName = request.UserName
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});
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}
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catch (Exception ex)
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{
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logger.LogError(ex, "调用图片识别扣费程序失败");
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//扣费失败显示空
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result = [];
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}
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return result;
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}
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}
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