mws.backend.dotnet/.superpowers/sdd/2026-08-13-cqrs-mediator/task-1-report.md

Task 1 Report: Add MediatR, wire DI, convert Auth module

What was done

1. Added MediatR package — ran dotnet add mws.application/mws.application.csproj package MediatR, which resolved and pinned MediatR version 14.2.0 (latest stable at time of run) into mws.application/mws.application.csproj.

2. Created mws.application/Auth/Commands/Login.cs — new file containing LoginCommand(LoginRequest Request) : IRequest<LoginResponse> and LoginHandler (constructor-injecting IUnitOfWork, IPasswordHasher, ITokenService, IMapper), copied verbatim from the brief's Step 2. Logic is an exact port of the old AuthService.LoginAsync body (trim username, look up user by username with role, verify password, check IsActive, throw UnauthorizedException/ForbiddenException as before, build LoginResponse with token + mapped UserDto).

3. Deleted mws.application/Auth/AuthService.cs — removed the old file containing both IAuthService and AuthService, now fully superseded by LoginCommand/LoginHandler.

4. Replaced mws.api/Controllers/AuthController.cs — controller now depends on ISender instead of IAuthService; Login action sends new LoginCommand(request) via sender.Send(...) and returns Ok(response). Matches the brief's Step 4 exactly.

5. Updated mws.infrastructure/DependencyInjection.cs:

   • Added services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(typeof(IUnitOfWork).Assembly)); immediately after services.AddAutoMapper(...).
   • Removed services.AddScoped<IAuthService, AuthService>();.
   • Left using Mws.Application.Auth; in place (still required for JwtOptions/ITokenService wiring elsewhere in the file), per the brief's explicit instruction.

Build output (tail)

mws.domain -> .../mws.domain/bin/Debug/net10.0/mws.domain.dll
mws.application -> .../mws.application/bin/Debug/net10.0/mws.application.dll
mws.infrastructure -> .../mws.infrastructure/bin/Debug/net10.0/mws.infrastructure.dll
/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/cqrs-mediator/mws.api/Program.cs(69,80): warning CS8604: Possible null reference argument for parameter 's' in 'byte[] Encoding.GetBytes(string s)'. [mws.api.csproj]
/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/cqrs-mediator/mws.api/Program.cs(85,26): warning CS8602: Dereference of a possibly null reference. [mws.api.csproj]
mws.api -> .../mws.api/bin/Debug/net10.0/mws.api.dll

Build succeeded.

    2 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.51

The only two warnings are the pre-existing, expected, out-of-scope nullable warnings in Program.cs (lines 69 and 85) — exactly as anticipated in the task instructions. 0 errors.

Commit

Commit hash: c5199fd23ffffebbb4580fc737a55c9083c00a48 (short: c5199fd)

commit c5199fd23ffffebbb4580fc737a55c9083c00a48
Author: namdh861 <namdh861@gmail.com>

    Convert Auth module to MediatR command

    Adds the MediatR package and wires AddMediatR in DI. Replaces
    IAuthService/AuthService with LoginCommand/LoginHandler, the pattern
    the remaining modules will follow.

 mws.api/Controllers/AuthController.cs     |  7 ++++---
 mws.application/Auth/AuthService.cs       | 35 -------------------------------
 mws.application/Auth/Commands/Login.cs    | 33 +++++++++++++++++++++++++++++
 mws.application/mws.application.csproj    |  1 +
 mws.infrastructure/DependencyInjection.cs |  2 +-
 5 files changed, 39 insertions(+), 39 deletions(-)

Files staged exactly matched the brief's git add list: mws.application/mws.application.csproj, mws.application/Auth (covering the deleted AuthService.cs and new Commands/Login.cs), mws.infrastructure/DependencyInjection.cs, mws.api/Controllers/AuthController.cs. Working tree was clean before and after except for these files — nothing unrelated was swept in.

Self-review against the brief

Diffed the commit (git show c5199fd, and git diff f72aaa2 c5199fd) against every code block in task-1-brief.md:

• mws.application.csproj: +<PackageReference Include="MediatR" Version="14.2.0" /> — package added, one line, no other csproj changes.
• Login.cs: byte-for-byte match to the brief's Step 2 code block (using directives, namespace, LoginCommand record, LoginHandler class with the four-parameter primary constructor, Handle method body identical to the old AuthService.LoginAsync).
• AuthService.cs: deleted, no trace left.
• AuthController.cs: byte-for-byte match to the brief's Step 4 code block — ISender constructor injection, sender.Send(new LoginCommand(request), ct).
• DependencyInjection.cs: AddMediatR line inserted immediately after AddAutoMapper, exactly as specified; AddScoped<IAuthService, AuthService>() line removed; using Mws.Application.Auth; left untouched (still needed by JwtOptions/ITokenService, confirmed by grep — no leftover unused-using warning appeared in the build).
• No other files were modified; no adjacent code was reformatted or "improved."
• Commit message matches the brief's Step 7 heredoc verbatim.

No deviations found. Task complete.

Fix round: MediatR version alignment

Changed mws.application/mws.application.csproj to use MediatR 13.1.0 per the design specification.

Command:

dotnet build mws.backend.dotnet.sln

Exact result:

Build succeeded.

/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/agent-a51365a1ed999f913/mws.api/Program.cs(69,80): warning CS8604: Possible null reference argument for parameter 's' in 'byte[] Encoding.GetBytes(string s)'. [/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/agent-a51365a1ed999f913/mws.api/mws.api.csproj]
/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/agent-a51365a1ed999f913/mws.api/Program.cs(85,26): warning CS8602: Dereference of a possibly null reference. [/Users/namdh/Desktop/mws.backend.dotnet/.claude/worktrees/agent-a51365a1ed999f913/mws.api/mws.api.csproj]
    2 Warning(s)
    0 Error(s)

Time Elapsed 00:00:09.33

The warnings are pre-existing nullable warnings in mws.api/Program.cs; the build completed successfully with zero errors.