Add audit logs.

API/ROLAC.API/Controllers/SystemLogsController.cs

@@ -0,0 +1,35 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using ROLAC.API.Authorization;
+using ROLAC.API.DTOs.Logging;
+using ROLAC.API.Entities.Logging;
+using ROLAC.API.Services.Logging;
+
+namespace ROLAC.API.Controllers;
+
+[ApiController]
+[Route("api/system-logs")]
+[Authorize]
+public class SystemLogsController : ControllerBase
+{
+    private readonly ISystemLogQueryService _svc;
+    public SystemLogsController(ISystemLogQueryService svc) => _svc = svc;
+
+    [HttpGet]
+    [HasPermission(Modules.SystemLogs, PermissionActions.Read)]
+    public async Task<IActionResult> GetPaged([FromQuery] SystemLogQuery query)
+        => Ok(await _svc.GetPagedAsync(query));
+
+    [HttpGet("{id:long}")]
+    [HasPermission(Modules.SystemLogs, PermissionActions.Read)]
+    public async Task<IActionResult> GetById(long id)
+    {
+        var dto = await _svc.GetByIdAsync(id);
+        return dto is null ? NotFound() : Ok(dto);
+    }
+
+    /// <summary>All six severities, so the UI can offer every filter option regardless of data.</summary>
+    [HttpGet("levels")]
+    [HasPermission(Modules.SystemLogs, PermissionActions.Read)]
+    public IActionResult GetLevels() => Ok(Enum.GetNames<LogLevelEnum>());
+}