Integrate SeaweedFS for S3-compatible file storage and photo upload (#254)

2026-10-14 17:54:42 +00:00 · 2026-08-29 23:37:11 -04:00
parent a580314583
commit be672b6ca9
25 changed files with 790 additions and 19 deletions
--- a/web/backend/API/API.Core/API.Core.csproj
+++ b/web/backend/API/API.Core/API.Core.csproj
@@ -20,10 +20,12 @@
        <ProjectReference Include="..\..\Database\Database.Connection\Database.Connection.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Jwt\Infrastructure.Jwt.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.FileUpload\Infrastructure.FileUpload.csproj" />
        <ProjectReference Include="..\..\Features\Features.Breweries\Features.Breweries.csproj" />
        <ProjectReference Include="..\..\Features\Features.UserManagement\Features.UserManagement.csproj" />
        <ProjectReference Include="..\..\Features\Features.Auth\Features.Auth.csproj" />
        <ProjectReference Include="..\..\Features\Features.Emails\Features.Emails.csproj" />
+        <ProjectReference Include="..\..\Features\Features.PhotoUpload\Features.PhotoUpload.csproj" />
        <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
        <ProjectReference Include="..\..\Shared\Shared.Application\Shared.Application.csproj" />
    </ItemGroup>
--- a/web/backend/API/API.Core/Dockerfile
+++ b/web/backend/API/API.Core/Dockerfile
@@ -30,11 +30,14 @@ COPY ["Features/Features.Emails/Features.Emails.csproj", "Features/Features.Emai
 COPY ["Features/Features.Emails.Tests/Features.Emails.Tests.csproj", "Features/Features.Emails.Tests/"]
 COPY ["Features/Features.Locations/Features.Locations.csproj", "Features/Features.Locations/"]
 COPY ["Features/Features.Locations.Tests/Features.Locations.Tests.csproj", "Features/Features.Locations.Tests/"]
+COPY ["Features/Features.PhotoUpload/Features.PhotoUpload.csproj", "Features/Features.PhotoUpload/"]
+COPY ["Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj", "Features/Features.PhotoUpload.Tests/"]
 COPY ["Features/Features.UserManagement/Features.UserManagement.csproj", "Features/Features.UserManagement/"]
 COPY ["Features/Features.UserManagement.Tests/Features.UserManagement.Tests.csproj", "Features/Features.UserManagement.Tests/"]
 COPY ["Infrastructure/Infrastructure.Configuration/Infrastructure.Configuration.csproj", "Infrastructure/Infrastructure.Configuration/"]
 COPY ["Infrastructure/Infrastructure.Email/Infrastructure.Email.csproj", "Infrastructure/Infrastructure.Email/"]
 COPY ["Infrastructure/Infrastructure.Email.Templates/Infrastructure.Email.Templates.csproj", "Infrastructure/Infrastructure.Email.Templates/"]
+COPY ["Infrastructure/Infrastructure.FileUpload/Infrastructure.FileUpload.csproj", "Infrastructure/Infrastructure.FileUpload/"]
 COPY ["Infrastructure/Infrastructure.Jwt/Infrastructure.Jwt.csproj", "Infrastructure/Infrastructure.Jwt/"]
 COPY ["Infrastructure/Infrastructure.PasswordHashing/Infrastructure.PasswordHashing.csproj", "Infrastructure/Infrastructure.PasswordHashing/"]
 COPY ["Shared/Shared.Application/Shared.Application.csproj", "Shared/Shared.Application/"]
--- a/web/backend/API/API.Core/Program.cs
+++ b/web/backend/API/API.Core/Program.cs
@@ -7,13 +7,19 @@ using Features.Breweries.Controllers;
 using Features.Breweries.DependencyInjection;
 using Features.Emails.DependencyInjection;
 using Features.Emails.Services;
+using Features.ImageUploads.Commands.UploadPhoto;
+using Features.ImageUploads.DependencyInjection;
 using Features.UserManagement.Controllers;
 using Features.UserManagement.DependencyInjection;
 using FluentValidation;
 using FluentValidation.AspNetCore;
+using Infrastructure.FileUpload;
 using Infrastructure.Jwt;
+using MediatR;
 using Microsoft.OpenApi.Models;
 using Shared.Application.Behaviors;
+using System.Security.Claims;
+using JwtRegisteredClaimNames = System.IdentityModel.Tokens.Jwt.JwtRegisteredClaimNames;

 WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

@@ -65,6 +71,7 @@ builder.Services.AddValidatorsFromAssemblyContaining<Program>();
 builder.Services.AddValidatorsFromAssembly(typeof(BreweryController).Assembly);
 builder.Services.AddValidatorsFromAssembly(typeof(UserController).Assembly);
 builder.Services.AddValidatorsFromAssembly(typeof(AuthController).Assembly);
+builder.Services.AddValidatorsFromAssembly(typeof(UploadPhotoCommand).Assembly);
 builder.Services.AddFluentValidationAutoValidation();

 // Add MediatR.
@@ -75,6 +82,7 @@ builder.Services.AddMediatR(cfg =>
    cfg.RegisterServicesFromAssembly(typeof(BreweryController).Assembly);
    cfg.RegisterServicesFromAssembly(typeof(UserController).Assembly);
    cfg.RegisterServicesFromAssembly(typeof(AuthController).Assembly);
+    cfg.RegisterServicesFromAssembly(typeof(UploadPhotoCommand).Assembly);
    cfg.RegisterServicesFromAssembly(typeof(IEmailDispatcher).Assembly);
    cfg.AddOpenBehavior(typeof(ValidationBehavior<,>));
 });
@@ -93,10 +101,13 @@ builder.Services.AddFeaturesBreweries();
 builder.Services.AddFeaturesUserManagement();
 builder.Services.AddFeaturesAuth();
 builder.Services.AddFeaturesEmails();
+builder.Services.AddFeaturesPhotoUpload();

 // ITokenInfrastructure is registered here because JwtAuthenticationHandler depends on it directly.
 builder.Services.AddScoped<ITokenInfrastructure, JwtInfrastructure>();

+builder.Services.AddSingleton<IFileStorageProvider, S3FileStorageProvider>();
+
 builder.Services.AddScoped<GlobalExceptionFilter>();

 builder
@@ -115,11 +126,24 @@ app.UseHttpsRedirection();

 app.UseAuthentication();
 app.UseAuthorization();
-
-// Health check endpoint (used by Docker health checks and orchestrators)
 app.MapHealthChecks("/health");

 app.MapControllers();
+
+app.MapPost(
+        "/upload-test",
+        async (IFormFile file, ClaimsPrincipal user, IMediator mediator) =>
+        {
+            Guid uploadedById = Guid.Parse(user.FindFirst(JwtRegisteredClaimNames.Sub)!.Value);
+            Guid photoId = await mediator.Send(
+                new UploadPhotoCommand(uploadedById, "upload-test", file)
+            );
+            return Results.Ok(photoId);
+        }
+    )
+    .RequireAuthorization()
+    .DisableAntiforgery();
+
 app.MapFallbackToController("Handle404", "NotFound");

 IHostApplicationLifetime lifetime = app.Services.GetRequiredService<IHostApplicationLifetime>();
--- a/web/backend/API/API.Specs/Dockerfile
+++ b/web/backend/API/API.Specs/Dockerfile
@@ -20,11 +20,14 @@ COPY ["Features/Features.Emails/Features.Emails.csproj", "Features/Features.Emai
 COPY ["Features/Features.Emails.Tests/Features.Emails.Tests.csproj", "Features/Features.Emails.Tests/"]
 COPY ["Features/Features.Locations/Features.Locations.csproj", "Features/Features.Locations/"]
 COPY ["Features/Features.Locations.Tests/Features.Locations.Tests.csproj", "Features/Features.Locations.Tests/"]
+COPY ["Features/Features.PhotoUpload/Features.PhotoUpload.csproj", "Features/Features.PhotoUpload/"]
+COPY ["Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj", "Features/Features.PhotoUpload.Tests/"]
 COPY ["Features/Features.UserManagement/Features.UserManagement.csproj", "Features/Features.UserManagement/"]
 COPY ["Features/Features.UserManagement.Tests/Features.UserManagement.Tests.csproj", "Features/Features.UserManagement.Tests/"]
 COPY ["Infrastructure/Infrastructure.Configuration/Infrastructure.Configuration.csproj", "Infrastructure/Infrastructure.Configuration/"]
 COPY ["Infrastructure/Infrastructure.Email/Infrastructure.Email.csproj", "Infrastructure/Infrastructure.Email/"]
 COPY ["Infrastructure/Infrastructure.Email.Templates/Infrastructure.Email.Templates.csproj", "Infrastructure/Infrastructure.Email.Templates/"]
+COPY ["Infrastructure/Infrastructure.FileUpload/Infrastructure.FileUpload.csproj", "Infrastructure/Infrastructure.FileUpload/"]
 COPY ["Infrastructure/Infrastructure.Jwt/Infrastructure.Jwt.csproj", "Infrastructure/Infrastructure.Jwt/"]
 COPY ["Infrastructure/Infrastructure.PasswordHashing/Infrastructure.PasswordHashing.csproj", "Infrastructure/Infrastructure.PasswordHashing/"]
 COPY ["Shared/Shared.Application/Shared.Application.csproj", "Shared/Shared.Application/"]
--- a/web/backend/Biergarten.API.slnx
+++ b/web/backend/Biergarten.API.slnx
@@ -16,6 +16,7 @@
        <Project Path="Infrastructure/Infrastructure.Configuration/Infrastructure.Configuration.csproj" />
        <Project Path="Infrastructure/Infrastructure.Email/Infrastructure.Email.csproj" />
        <Project Path="Infrastructure/Infrastructure.Email.Templates/Infrastructure.Email.Templates.csproj" />
+        <Project Path="Infrastructure/Infrastructure.FileUpload/Infrastructure.FileUpload.csproj" />
        <Project Path="Infrastructure/Infrastructure.Jwt/Infrastructure.Jwt.csproj" />
        <Project Path="Infrastructure/Infrastructure.PasswordHashing/Infrastructure.PasswordHashing.csproj" />
    </Folder>
@@ -30,6 +31,8 @@
        <Project Path="Features/Features.Emails.Tests/Features.Emails.Tests.csproj" />
        <Project Path="Features/Features.Locations/Features.Locations.csproj" />
        <Project Path="Features/Features.Locations.Tests/Features.Locations.Tests.csproj" />
+        <Project Path="Features\Features.PhotoUpload\Features.PhotoUpload.csproj" />
+        <Project Path="Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj" />
    </Folder>
    <Folder Name="/Shared/">
        <Project Path="Shared/Shared.Contracts/Shared.Contracts.csproj" />
--- a/web/backend/Database/Database.Connection/Repository.cs
+++ b/web/backend/Database/Database.Connection/Repository.cs
@@ -18,4 +18,21 @@ public abstract class DapperRepository(ISqlConnectionFactory connectionFactory)
        await connection.OpenAsync();
        return connection;
    }
+
+    /// <summary>
+    ///     Rolls back <paramref name="transaction" />, swallowing any exception the rollback itself
+    ///     raises (for example when the provider has already completed the transaction after a
+    ///     connection failure) so the exception that triggered the rollback is what propagates.
+    /// </summary>
+    protected static async Task RollbackQuietlyAsync(DbTransaction transaction)
+    {
+        try
+        {
+            await transaction.RollbackAsync();
+        }
+        catch
+        {
+            // Ignore: the original exception (rethrown by the caller) is what matters here.
+        }
+    }
 }
--- a/web/backend/Domain/Domain.Entities/Entities/Photo.cs
+++ b/web/backend/Domain/Domain.Entities/Entities/Photo.cs
@@ -0,0 +1,17 @@
+namespace Domain.Entities;
+
+public sealed class Photo
+{
+    // PK
+    public Guid PhotoId { get; set; }
+
+    // FK References
+    public Guid UploadedById { get; set; }
+
+    // Attributes
+    public string? Hyperlink { get; set; }
+
+    // Audit Fields
+    public DateTime UploadedAt { get; set; }
+    public byte[]? RowVersion { get; set; }
+}
--- a/web/backend/Features/Features.Breweries/Repository/BreweryRepository.cs
+++ b/web/backend/Features/Features.Breweries/Repository/BreweryRepository.cs
@@ -537,22 +537,6 @@ public class BreweryRepository(ISqlConnectionFactory connectionFactory)
        }
    }

-    /// <summary>
-    ///     Rolls back <paramref name="transaction" />, swallowing any exception the rollback itself
-    ///     raises (for example when the provider has already completed the transaction after a
-    ///     connection failure) so the exception that triggered the rollback is what propagates.
-    /// </summary>
-    private static async Task RollbackQuietlyAsync(DbTransaction transaction)
-    {
-        try
-        {
-            await transaction.RollbackAsync();
-        }
-        catch
-        {
-            // Ignore: the original exception (rethrown by the caller) is what matters here.
-        }
-    }

    /// <summary>
    ///     Composes a joined row's <see cref="BreweryPost" />, <see cref="BreweryPostLocation" />,
--- a/web/backend/Features/Features.PhotoUpload.Tests/Commands/UploadPhotoHandlerTests.cs
+++ b/web/backend/Features/Features.PhotoUpload.Tests/Commands/UploadPhotoHandlerTests.cs
@@ -0,0 +1,120 @@
+using Domain.Entities;
+using Features.ImageUploads.Commands.UploadPhoto;
+using Features.ImageUploads.Repository;
+using FluentAssertions;
+using Infrastructure.FileUpload;
+using Microsoft.AspNetCore.Http;
+using Moq;
+
+namespace Features.PhotoUpload.Tests.Commands;
+
+public class UploadPhotoHandlerTests
+{
+    private readonly Mock<IFileStorageProvider> _fileStorageProviderMock = new();
+    private readonly UploadPhotoHandler _handler;
+    private readonly Mock<IPhotoUploadRepository> _repoMock = new();
+
+    public UploadPhotoHandlerTests()
+    {
+        _handler = new UploadPhotoHandler(_fileStorageProviderMock.Object, _repoMock.Object);
+    }
+
+    private static Mock<IFormFile> ValidFile(
+        string content = "fake-image-bytes",
+        string contentType = "image/png"
+    )
+    {
+        Mock<IFormFile> file = new();
+        byte[] bytes = System.Text.Encoding.UTF8.GetBytes(content);
+        file.Setup(f => f.OpenReadStream()).Returns(() => new MemoryStream(bytes));
+        file.Setup(f => f.ContentType).Returns(contentType);
+        file.Setup(f => f.Length).Returns(bytes.Length);
+        return file;
+    }
+
+    [Fact]
+    public async Task Handle_UploadsFileUnderRequestedKey_AndPersistsPhoto_ReturnsNewPhotoId()
+    {
+        Mock<IFormFile> file = ValidFile();
+        UploadPhotoCommand command = new(Guid.NewGuid(), "breweries/some-brewery-id", file.Object);
+
+        string? uploadedKey = null;
+        string? uploadedContentType = null;
+        _fileStorageProviderMock
+            .Setup(p =>
+                p.UploadAsync(
+                    It.IsAny<string>(),
+                    It.IsAny<Stream>(),
+                    It.IsAny<string>(),
+                    It.IsAny<CancellationToken>()
+                )
+            )
+            .Callback<string, Stream, string, CancellationToken>(
+                (key, _, contentType, _) =>
+                {
+                    uploadedKey = key;
+                    uploadedContentType = contentType;
+                }
+            )
+            .Returns(Task.CompletedTask);
+
+        Photo? persisted = null;
+        _repoMock
+            .Setup(r => r.CreateAsync(It.IsAny<Photo>(), It.IsAny<CancellationToken>()))
+            .Callback<Photo, CancellationToken>((photo, _) => persisted = photo)
+            .Returns(Task.CompletedTask);
+
+        Guid photoId = await _handler.Handle(command, CancellationToken.None);
+
+        photoId.Should().NotBe(Guid.Empty);
+
+        uploadedKey.Should().Be($"breweries/some-brewery-id/{photoId}");
+        uploadedContentType.Should().Be("image/png");
+
+        persisted.Should().NotBeNull();
+        persisted!.Hyperlink.Should().Be(uploadedKey);
+        persisted.UploadedById.Should().Be(command.UploadedById);
+
+        _fileStorageProviderMock.Verify(
+            p =>
+                p.UploadAsync(
+                    uploadedKey!,
+                    It.IsAny<Stream>(),
+                    "image/png",
+                    It.IsAny<CancellationToken>()
+                ),
+            Times.Once
+        );
+        _repoMock.Verify(
+            r => r.CreateAsync(It.IsAny<Photo>(), It.IsAny<CancellationToken>()),
+            Times.Once
+        );
+    }
+
+
+    [Fact]
+    public async Task Handle_UploadOrderedBeforePersist_DoesNotPersistWhenUploadFails()
+    {
+        Mock<IFormFile> file = ValidFile();
+        UploadPhotoCommand command = new(Guid.NewGuid(), "avatars", file.Object);
+
+        _fileStorageProviderMock
+            .Setup(p =>
+                p.UploadAsync(
+                    It.IsAny<string>(),
+                    It.IsAny<Stream>(),
+                    It.IsAny<string>(),
+                    It.IsAny<CancellationToken>()
+                )
+            )
+            .ThrowsAsync(new InvalidOperationException("storage unavailable"));
+
+        Func<Task> act = () => _handler.Handle(command, CancellationToken.None);
+
+        await act.Should().ThrowAsync<InvalidOperationException>();
+        _repoMock.Verify(
+            r => r.CreateAsync(It.IsAny<Photo>(), It.IsAny<CancellationToken>()),
+            Times.Never
+        );
+    }
+}
--- a/web/backend/Features/Features.PhotoUpload.Tests/Commands/UploadPhotoValidatorTests.cs
+++ b/web/backend/Features/Features.PhotoUpload.Tests/Commands/UploadPhotoValidatorTests.cs
@@ -0,0 +1,154 @@
+using Features.ImageUploads.Commands.UploadPhoto;
+using FluentAssertions;
+using FluentValidation.Results;
+using Microsoft.AspNetCore.Http;
+using Moq;
+
+namespace Features.PhotoUpload.Tests.Commands;
+
+public class UploadPhotoValidatorTests
+{
+    private static readonly byte[] PngSignature =
+    [
+        0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A
+    ];
+
+    private static readonly byte[] JpegSignature =
+    [
+        0xFF, 0xD8, 0xFF
+    ];
+
+    private static readonly byte[] WebPSignature =
+    [
+        0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x45, 0x42, 0x50 // "RIFF____WEBP"
+    ];
+
+    private static readonly byte[] GifSignature =
+    [
+        0x47, 0x49, 0x46, 0x38, 0x39, 0x61 // "GIF89a"
+    ];
+
+    private static readonly byte[] BmpSignature =
+    [
+        0x42, 0x4D // "BM"
+    ];
+
+    private static readonly byte[] PdfSignature =
+    [
+        0x25, 0x50, 0x44, 0x46 // "%PDF"
+    ];
+
+    private static readonly byte[] PlainTextBytes = "not an image"u8.ToArray();
+
+    private const long MinSizeBytes = 1024; // 1 KiB
+    private const long MaxSizeBytes = 24 * 1024 * 1024; // 24 MiB
+
+    private readonly UploadPhotoValidator _validator = new();
+
+    private static Mock<IFormFile> FileOfSize(long sizeInBytes)
+    {
+        byte[] bytes = new byte[Math.Max(sizeInBytes, PngSignature.Length)];
+        PngSignature.CopyTo(bytes, 0);
+
+        Mock<IFormFile> file = new();
+        file.Setup(f => f.OpenReadStream()).Returns(() => new MemoryStream(bytes));
+        file.Setup(f => f.ContentType).Returns("image/png");
+        file.Setup(f => f.Length).Returns(sizeInBytes);
+        return file;
+    }
+
+    private static Mock<IFormFile> FileWithHeader(byte[] header, long sizeInBytes = 0)
+    {
+        byte[] bytes = new byte[Math.Max(sizeInBytes, Math.Max(header.Length, MinSizeBytes))];
+        header.CopyTo(bytes, 0);
+
+        Mock<IFormFile> file = new();
+        file.Setup(f => f.OpenReadStream()).Returns(() => new MemoryStream(bytes));
+        file.Setup(f => f.ContentType).Returns("image/png");
+        file.Setup(f => f.Length).Returns(bytes.Length);
+        return file;
+    }
+
+    private static UploadPhotoCommand CommandWithFile(IFormFile file) =>
+        new(Guid.NewGuid(), "breweries/some-brewery-id", file);
+
+    public static TheoryData<string, byte[]> ValidSignatures => new()
+    {
+        { "PNG", PngSignature },
+        { "JPEG", JpegSignature },
+        { "WebP", WebPSignature }
+    };
+
+    public static TheoryData<string, byte[]> InvalidSignatures => new()
+    {
+        { "GIF", GifSignature },
+        { "BMP", BmpSignature },
+        { "PDF", PdfSignature },
+        { "plain text", PlainTextBytes }
+    };
+
+    [Fact]
+    public async Task Validate_FileBelowMinSize_FailsWithSizeError()
+    {
+        Mock<IFormFile> file = FileOfSize(MinSizeBytes - 1);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.IsValid.Should().BeFalse();
+        result.Errors.Should().Contain(e => e.PropertyName == "File.Length");
+    }
+
+    [Fact]
+    public async Task Validate_FileAtMinSize_PassesSizeCheck()
+    {
+        Mock<IFormFile> file = FileOfSize(MinSizeBytes);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.Errors.Should().NotContain(e => e.PropertyName == "File.Length");
+    }
+
+    [Fact]
+    public async Task Validate_FileAtMaxSize_PassesSizeCheck()
+    {
+        Mock<IFormFile> file = FileOfSize(MaxSizeBytes);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.Errors.Should().NotContain(e => e.PropertyName == "File.Length");
+    }
+
+    [Fact]
+    public async Task Validate_FileAboveMaxSize_FailsWithSizeError()
+    {
+        Mock<IFormFile> file = FileOfSize(MaxSizeBytes + 1);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.IsValid.Should().BeFalse();
+        result.Errors.Should().Contain(e => e.PropertyName == "File.Length");
+    }
+
+    [Theory]
+    [MemberData(nameof(ValidSignatures))]
+    public async Task Validate_ValidImageSignature_PassesSignatureCheck(string formatName, byte[] header)
+    {
+        Mock<IFormFile> file = FileWithHeader(header);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.Errors.Should().NotContain(e => e.PropertyName == "File", formatName);
+    }
+
+    [Theory]
+    [MemberData(nameof(InvalidSignatures))]
+    public async Task Validate_InvalidImageSignature_FailsWithSignatureError(string formatName, byte[] header)
+    {
+        Mock<IFormFile> file = FileWithHeader(header);
+
+        ValidationResult result = await _validator.ValidateAsync(CommandWithFile(file.Object));
+
+        result.IsValid.Should().BeFalse(formatName);
+        result.Errors.Should().Contain(e => e.PropertyName == "File", formatName);
+    }
+}
--- a/web/backend/Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj
+++ b/web/backend/Features/Features.PhotoUpload.Tests/Features.PhotoUpload.Tests.csproj
@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+        <RootNamespace>Features.PhotoUpload.Tests</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+        <PackageReference Include="xunit" Version="2.9.2" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+        <PackageReference Include="Moq" Version="4.20.72" />
+        <PackageReference Include="FluentAssertions" Version="7.2.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <Using Include="Xunit" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\Features.PhotoUpload\Features.PhotoUpload.csproj" />
+    </ItemGroup>
+</Project>
--- a/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoCommand.cs
+++ b/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoCommand.cs
@@ -0,0 +1,11 @@
+using MediatR;
+using Microsoft.AspNetCore.Http;
+
+namespace Features.ImageUploads.Commands.UploadPhoto;
+
+/// <summary>
+///     Uploads a new photo to storage under <c>{Key}/{generated photo id}</c> and records it. Sent by
+///     other features' handlers (e.g. a brewery photo upload command) rather than bound from a request
+///     directly, since this feature exposes no controller of its own.
+/// </summary>
+public record UploadPhotoCommand(Guid UploadedById, string Key, IFormFile File) : IRequest<Guid>;
--- a/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoHandler.cs
+++ b/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoHandler.cs
@@ -0,0 +1,34 @@
+using Domain.Entities;
+using Features.ImageUploads.Repository;
+using Infrastructure.FileUpload;
+using MediatR;
+
+namespace Features.ImageUploads.Commands.UploadPhoto;
+
+/// <summary>Handles <see cref="UploadPhotoCommand" />.</summary>
+public class UploadPhotoHandler(
+    IFileStorageProvider fileStorageProvider,
+    IPhotoUploadRepository photoUploadRepository
+) : IRequestHandler<UploadPhotoCommand, Guid>
+{
+    public async Task<Guid> Handle(UploadPhotoCommand request, CancellationToken cancellationToken)
+    {
+        Guid photoId = Guid.NewGuid();
+        string key = $"{request.Key}/{photoId}";
+
+        await using Stream stream = request.File.OpenReadStream();
+
+        await fileStorageProvider.UploadAsync(
+            key,
+            stream,
+            request.File.ContentType,
+            cancellationToken
+        );
+
+        Photo photo = new() { Hyperlink = key, UploadedById = request.UploadedById };
+
+        await photoUploadRepository.CreateAsync(photo, cancellationToken);
+
+        return photoId;
+    }
+}
--- a/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoValidator.cs
+++ b/web/backend/Features/Features.PhotoUpload/Commands/UploadPhoto/UploadPhotoValidator.cs
@@ -0,0 +1,82 @@
+using FluentValidation;
+using Microsoft.AspNetCore.Http;
+
+namespace Features.ImageUploads.Commands.UploadPhoto;
+
+/// <summary>Validates <see cref="UploadPhotoCommand" />.</summary>
+public class UploadPhotoValidator : AbstractValidator<UploadPhotoCommand>
+{
+    private static readonly byte[] PngSignature = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
+
+    private static readonly byte[] JpegSignature = [0xFF, 0xD8, 0xFF];
+
+    private static readonly byte[] RiffSignature =
+    [
+        0x52,
+        0x49,
+        0x46,
+        0x46, // "RIFF"
+    ];
+
+    private static readonly byte[] WebPMarker =
+    [
+        0x57,
+        0x45,
+        0x42,
+        0x50, // "WEBP"
+    ];
+
+    private const long MinSizeBytes = 1024; // 1 KiB
+    private const long MaxSizeBytes = 24 * 1024 * 1024; // 24 MiB
+
+    public UploadPhotoValidator()
+    {
+        RuleFor(x => x.UploadedById).NotEmpty().WithMessage("UploadedById is required.");
+
+        RuleFor(x => x.File).NotNull().WithMessage("File is required.");
+
+        RuleFor(x => x.Key).NotEmpty().WithMessage("Key is required.");
+
+        RuleFor(x => x.File.ContentType)
+            .Must(contentType =>
+                contentType.StartsWith("image/", StringComparison.OrdinalIgnoreCase)
+            )
+            .WithMessage("File must be an image.");
+
+        RuleFor(x => x.File.Length)
+            .InclusiveBetween(MinSizeBytes, MaxSizeBytes)
+            .WithMessage("The file must be between 1 KiB and 24 MiB.");
+
+        RuleFor(x => x.File)
+            .MustAsync(HaveValidImageSignatureAsync)
+            .WithMessage("The file is not a valid PNG, JPEG, or WebP image.");
+    }
+
+    private static async Task<bool> HaveValidImageSignatureAsync(
+        IFormFile file,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = new byte[12];
+        await using var stream = file.OpenReadStream();
+        var bytesRead = await stream.ReadAsync(
+            buffer.AsMemory(0, buffer.Length),
+            cancellationToken
+        );
+
+        return IsPng(buffer, bytesRead) || IsJpeg(buffer, bytesRead) || IsWebP(buffer, bytesRead);
+    }
+
+    private static bool IsPng(byte[] buffer, int bytesRead) =>
+        bytesRead >= PngSignature.Length
+        && buffer.AsSpan(0, PngSignature.Length).SequenceEqual(PngSignature);
+
+    private static bool IsJpeg(byte[] buffer, int bytesRead) =>
+        bytesRead >= JpegSignature.Length
+        && buffer.AsSpan(0, JpegSignature.Length).SequenceEqual(JpegSignature);
+
+    private static bool IsWebP(byte[] buffer, int bytesRead) =>
+        bytesRead >= 12
+        && buffer.AsSpan(0, 4).SequenceEqual(RiffSignature)
+        && buffer.AsSpan(8, 4).SequenceEqual(WebPMarker);
+}
--- a/web/backend/Features/Features.PhotoUpload/DependencyInjection/FeaturesPhotoUploadServiceCollectionExtensions.cs
+++ b/web/backend/Features/Features.PhotoUpload/DependencyInjection/FeaturesPhotoUploadServiceCollectionExtensions.cs
@@ -0,0 +1,16 @@
+using Features.ImageUploads.Repository;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Features.ImageUploads.DependencyInjection;
+
+/// <summary>Registers the services required by the PhotoUpload feature.</summary>
+public static class FeaturesPhotoUploadServiceCollectionExtensions
+{
+    /// <summary>Registers <see cref="IPhotoUploadRepository" /> and its implementation.</summary>
+    /// <returns><paramref name="services" />, for chaining.</returns>
+    public static IServiceCollection AddFeaturesPhotoUpload(this IServiceCollection services)
+    {
+        services.AddScoped<IPhotoUploadRepository, PhotoUploadRepository>();
+        return services;
+    }
+}
--- a/web/backend/Features/Features.PhotoUpload/Features.PhotoUpload.csproj
+++ b/web/backend/Features/Features.PhotoUpload/Features.PhotoUpload.csproj
@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>Features.ImageUploads</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\Domain\Domain.Entities\Domain.Entities.csproj" />
+        <ProjectReference Include="..\..\Domain\Domain.Exceptions\Domain.Exceptions.csproj" />
+        <ProjectReference Include="..\..\Database\Database.Connection\Database.Connection.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.FileUpload\Infrastructure.FileUpload.csproj" />
+        <ProjectReference Include="..\..\Shared\Shared.Contracts\Shared.Contracts.csproj" />
+        <ProjectReference Include="..\..\Shared\Shared.Application\Shared.Application.csproj" />
+    </ItemGroup>
+</Project>
--- a/web/backend/Features/Features.PhotoUpload/Repository/IPhotoUploadRepository.cs
+++ b/web/backend/Features/Features.PhotoUpload/Repository/IPhotoUploadRepository.cs
--- a/web/backend/Features/Features.PhotoUpload/Repository/PhotoUploadRepository.cs
+++ b/web/backend/Features/Features.PhotoUpload/Repository/PhotoUploadRepository.cs
@@ -0,0 +1,63 @@
+using System.Data.Common;
+using Dapper;
+using Database.Connection;
+using Domain.Entities;
+using Domain.Exceptions;
+
+namespace Features.ImageUploads.Repository;
+
+public interface IPhotoUploadRepository
+{
+    Task CreateAsync(Photo photo, CancellationToken cancellationToken);
+}
+
+public class PhotoUploadRepository(ISqlConnectionFactory connectionFactory)
+    : DapperRepository(connectionFactory),
+        IPhotoUploadRepository
+{
+    public async Task CreateAsync(Photo photo, CancellationToken cancellationToken)
+    {
+        await using DbConnection connection = await CreateConnection();
+        await using DbTransaction transaction = await connection.BeginTransactionAsync();
+
+        try
+        {
+            bool userExists =
+                await connection.ExecuteScalarAsync<int?>(
+                    new CommandDefinition(
+                        """
+                                    SELECT 1
+                                    FROM
+                                        dbo.UserAccount
+                                    WHERE
+                                        UserAccountID = @UploadedById
+                        """,
+                        new { photo.UploadedById },
+                        transaction
+                    )
+                )
+                is not null;
+
+            if (!userExists)
+                throw new NotFoundException("User not found.");
+
+            await connection.ExecuteAsync(
+                new CommandDefinition(
+                    """
+                    INSERT INTO dbo.Photo (Hyperlink, UploadedByID)
+                    VALUES (@Hyperlink, @UploadedById)
+                    """,
+                    new { photo.Hyperlink, photo.UploadedById },
+                    transaction
+                )
+            );
+
+            await transaction.CommitAsync(cancellationToken);
+        }
+        catch
+        {
+            await RollbackQuietlyAsync(transaction);
+            throw;
+        }
+    }
+}
--- a/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationKeys.cs
+++ b/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationKeys.cs
@@ -22,6 +22,11 @@ public static class ConfigurationKeys
    public const string SmtpFromEmail = "SMTP_FROM_EMAIL";
    public const string SmtpFromName = "SMTP_FROM_NAME";

+    public const string SeaweedFsServiceUrl = "SEAWEEDFS_SERVICE_URL";
+    public const string SeaweedFsAccessKeyId = "SEAWEEDFS_ACCESS_KEY_ID";
+    public const string SeaweedFsSecretAccessKey = "SEAWEEDFS_SECRET_ACCESS_KEY";
+    public const string SeaweedFsBucket = "SEAWEEDFS_BUCKET";
+
    public const string DbServer = "DB_SERVER";
    public const string DbUser = "DB_USER";
    public const string DbPassword = "DB_PASSWORD";
--- a/web/backend/Infrastructure/Infrastructure.FileUpload/IFileStorageProvider.cs
+++ b/web/backend/Infrastructure/Infrastructure.FileUpload/IFileStorageProvider.cs
@@ -0,0 +1,29 @@
+namespace Infrastructure.FileUpload;
+
+/// <summary>
+///     Service for storing and retrieving uploaded files in S3-compatible object storage.
+/// </summary>
+public interface IFileStorageProvider
+{
+    /// <summary>Uploads a file to the configured bucket.</summary>
+    /// <param name="key">The object key (path) to store the file under.</param>
+    /// <param name="content">The file content.</param>
+    /// <param name="contentType">The MIME type of the file.</param>
+    /// <param name="cancellationToken">A token to cancel the upload.</param>
+    Task UploadAsync(
+        string key,
+        Stream content,
+        string contentType,
+        CancellationToken cancellationToken = default
+    );
+
+    /// <summary>Deletes a file from the configured bucket.</summary>
+    /// <param name="key">The object key of the file to delete.</param>
+    /// <param name="cancellationToken">A token to cancel the deletion.</param>
+    Task DeleteAsync(string key, CancellationToken cancellationToken = default);
+
+    /// <summary>Generates a time-limited URL for retrieving a file directly from storage.</summary>
+    /// <param name="key">The object key of the file.</param>
+    /// <param name="expiresIn">How long the URL remains valid.</param>
+    string GetPresignedUrl(string key, TimeSpan expiresIn);
+}
--- a/web/backend/Infrastructure/Infrastructure.FileUpload/Infrastructure.FileUpload.csproj
+++ b/web/backend/Infrastructure/Infrastructure.FileUpload/Infrastructure.FileUpload.csproj
@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>Infrastructure.FileUpload</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="AWSSDK.S3" Version="4.0.102.4" />
+        <PackageReference
+            Include="Microsoft.Extensions.Configuration.Abstractions"
+            Version="10.0.1"
+        />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
+    </ItemGroup>
+</Project>
--- a/web/backend/Infrastructure/Infrastructure.FileUpload/S3FileStorageProvider.cs
+++ b/web/backend/Infrastructure/Infrastructure.FileUpload/S3FileStorageProvider.cs
@@ -0,0 +1,96 @@
+using Amazon.S3;
+using Amazon.S3.Model;
+using Infrastructure.Configuration;
+using Microsoft.Extensions.Configuration;
+
+namespace Infrastructure.FileUpload;
+
+/// <summary>
+///     File storage service backed by an S3-compatible object store (e.g. SeaweedFS, AWS S3).
+///     Configured via application configuration (backed by environment variables).
+/// </summary>
+public class S3FileStorageProvider : IFileStorageProvider, IDisposable
+{
+    private readonly string _bucket;
+    private readonly IAmazonS3 _client;
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="S3FileStorageProvider" /> class, reading storage
+    ///     configuration (<c>SEAWEEDFS_SERVICE_URL</c>, <c>SEAWEEDFS_ACCESS_KEY_ID</c>,
+    ///     <c>SEAWEEDFS_SECRET_ACCESS_KEY</c>, <c>SEAWEEDFS_BUCKET</c>) from <paramref name="configuration" />.
+    /// </summary>
+    /// <exception cref="InvalidOperationException">
+    ///     Thrown when any of the required configuration values is not set.
+    /// </exception>
+    public S3FileStorageProvider(IConfiguration configuration)
+    {
+        string serviceUrl = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.SeaweedFsServiceUrl
+        );
+        string accessKeyId = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.SeaweedFsAccessKeyId
+        );
+        string secretAccessKey = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.SeaweedFsSecretAccessKey
+        );
+
+        _bucket = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.SeaweedFsBucket
+        );
+
+        AmazonS3Config config = new() { ServiceURL = serviceUrl, ForcePathStyle = true };
+
+        _client = new AmazonS3Client(accessKeyId, secretAccessKey, config);
+    }
+
+    /// <inheritdoc/>
+    public async Task UploadAsync(
+        string key,
+        Stream content,
+        string contentType,
+        CancellationToken cancellationToken = default
+    )
+    {
+        PutObjectRequest request = new()
+        {
+            BucketName = _bucket,
+            Key = key,
+            InputStream = content,
+            ContentType = contentType,
+        };
+
+        await _client.PutObjectAsync(request, cancellationToken);
+    }
+
+    /// <inheritdoc/>
+    public async Task DeleteAsync(string key, CancellationToken cancellationToken = default)
+    {
+        DeleteObjectRequest request = new() { BucketName = _bucket, Key = key };
+
+        await _client.DeleteObjectAsync(request, cancellationToken);
+    }
+
+    /// <inheritdoc/>
+    public string GetPresignedUrl(string key, TimeSpan expiresIn)
+    {
+        GetPreSignedUrlRequest request = new()
+        {
+            BucketName = _bucket,
+            Key = key,
+            Expires = DateTime.UtcNow.Add(expiresIn),
+        };
+
+        return _client.GetPreSignedURL(request);
+    }
+
+    /// <inheritdoc/>
+    public void Dispose()
+    {
+        _client.Dispose();
+        GC.SuppressFinalize(this);
+    }
+}