# 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` 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— removed the old file containing both `IAuthService` and `AuthService`, now fully superseded by `LoginCommand`/`LoginHandler`. 4.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();`. - 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 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`: `+` — 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()` 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: ```text dotnet build mws.backend.dotnet.sln ``` Exact result: ```text 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.