initial commit

2026-06-26 04:20:20 +08:00
commit 869006e5e7
64 changed files with 4632 additions and 0 deletions
@@ -0,0 +1,67 @@
+using System.Security.Cryptography;
+using Microsoft.Extensions.Options;
+using Minio;
+using Minio.DataModel.Args;
+
+public class DocumentStorageService : IDocumentStorageService
+{
+    private readonly IMinioClient _minio;
+    private readonly MinioOptions _options;
+
+    public DocumentStorageService(IMinioClient minio, IOptions<MinioOptions> options)
+    {
+        _minio = minio;
+        _options = options.Value;
+    }
+
+    public async Task<(string objectKey, string sha256, long fileSize)> UploadAsync(
+        Stream fileStream, string contentType, Guid batchId)
+    {
+        var now = DateTimeOffset.UtcNow;
+        using var sha256 = SHA256.Create();
+        using var memStream = new MemoryStream();
+
+        await fileStream.CopyToAsync(memStream);
+        memStream.Position = 0;
+
+        var hashBytes = sha256.ComputeHash(memStream);
+        var hashHex = Convert.ToHexString(hashBytes).ToLowerInvariant();
+        memStream.Position = 0;
+
+        var extension = contentType switch
+        {
+            "application/pdf" => "pdf",
+            "image/jpeg" => "jpg",
+            "image/png" => "png",
+            _ => "bin"
+        };
+
+        var objectKey = $"scans/{now.Year}/{now.Month:D2}/{batchId}/{hashHex}.{extension}";
+
+        await EnsureBucketAsync();
+
+        await _minio.PutObjectAsync(new PutObjectArgs()
+            .WithBucket(_options.BucketName)
+            .WithObject(objectKey)
+            .WithStreamData(memStream)
+            .WithObjectSize(memStream.Length)
+            .WithContentType(contentType));
+
+        return (objectKey, hashHex, memStream.Length);
+    }
+
+    public async Task<string> GetPresignedUrlAsync(string objectKey)
+    {
+        return await _minio.PresignedGetObjectAsync(new PresignedGetObjectArgs()
+            .WithBucket(_options.BucketName)
+            .WithObject(objectKey)
+            .WithExpiry(_options.PresignedUrlExpiryMinutes * 60));
+    }
+
+    private async Task EnsureBucketAsync()
+    {
+        var exists = await _minio.BucketExistsAsync(new BucketExistsArgs().WithBucket(_options.BucketName));
+        if (!exists)
+            await _minio.MakeBucketAsync(new MakeBucketArgs().WithBucket(_options.BucketName));
+    }
+}