[backend/api] Add instance staff endpoint

Iceshrimp.Backend/Controllers/Web/InstanceController.cs

@@ -0,0 +1,40 @@
+using System.Net;
+using System.Net.Mime;
+using Iceshrimp.Backend.Controllers.Shared.Attributes;
+using Iceshrimp.Backend.Controllers.Web.Renderers;
+using Iceshrimp.Backend.Core.Database;
+using Iceshrimp.Backend.Core.Extensions;
+using Iceshrimp.Backend.Core.Middleware;
+using Iceshrimp.Shared.Schemas.Web;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.RateLimiting;
+
+namespace Iceshrimp.Backend.Controllers.Web;
+
+[ApiController]
+[EnableRateLimiting("sliding")]
+[Route("/api/iceshrimp/instance")]
+[Produces(MediaTypeNames.Application.Json)]
+public class InstanceController(DatabaseContext db, UserRenderer userRenderer) : ControllerBase
+{
+    [HttpGet("staff")]
+    [Authenticate]
+    [Authorize]
+    [ProducesResults(HttpStatusCode.OK)]
+    public async Task<StaffResponse> GetStaff()
+    {
+        var admins = db.Users
+                       .Where(p => p.IsAdmin == true)
+                       .OrderBy(p => p.UsernameLower);
+        var adminList = await userRenderer.RenderMany(admins)
+                                          .ToListAsync();
+
+        var moderators = db.Users
+                           .Where(p => p.IsAdmin == false && p.IsModerator == true)
+                           .OrderBy(p => p.UsernameLower);
+        var moderatorList = await userRenderer.RenderMany(moderators)
+                                              .ToListAsync();
+
+        return new StaffResponse { Admins = adminList, Moderators = moderatorList };
+    }
+}

Iceshrimp.Shared/Schemas/Web/InstanceResponse.cs

@@ -0,0 +1,10 @@
+namespace Iceshrimp.Shared.Schemas.Web;
+
+// TODO: Instance Response for /api/iceshrimp/instance
+public class InstanceResponse { }
+
+public class StaffResponse
+{
+    public required List<UserResponse> Admins     { get; set; }
+    public required List<UserResponse> Moderators { get; set; }
+}