Add server-side ELO ratings

api/QuestionsApi/Controllers/RatingsController.cs

@@ -0,0 +1,32 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using QuestionsApi.Services;
+using System.Security.Claims;
+
+namespace QuestionsApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class RatingsController : ControllerBase
+{
+    private readonly RatingStore _ratings;
+
+    public RatingsController(RatingStore ratings)
+    {
+        _ratings = ratings;
+    }
+
+    [HttpGet("me")]
+    [Authorize(Roles = "USER,SUPER")]
+    public async Task<IActionResult> Me()
+    {
+        var userId = User.FindFirstValue(ClaimTypes.NameIdentifier)
+            ?? User.FindFirstValue(ClaimTypes.Name)
+            ?? User.Identity?.Name
+            ?? "";
+        if (string.IsNullOrWhiteSpace(userId))
+            return Unauthorized();
+
+        return Ok(await _ratings.GetProfileAsync(userId));
+    }
+}