Implement player count reading

Closes #15

ProjectLighthouse/Controllers/MatchController.cs

@@ -0,0 +1,53 @@
+#nullable enable
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using ProjectLighthouse.Helpers;
+using ProjectLighthouse.Types;
+
+namespace ProjectLighthouse.Controllers {
+    [ApiController]
+    [Route("LITTLEBIGPLANETPS3_XML/")]
+    [Produces("text/xml")]
+    public class MatchController : ControllerBase {
+        private readonly Database database;
+        public MatchController(Database database) {
+            this.database = database;
+        }
+
+        [HttpPost("match")]
+        [Produces("text/json")]
+        public async Task<IActionResult> Match() {
+            User? user = await this.database.UserFromRequest(this.Request);
+
+            if(user == null) return this.StatusCode(403, "");
+            LastMatch? lastMatch = await this.database.LastMatches
+                .Where(l => l.UserId == user.UserId).FirstOrDefaultAsync();
+
+            // below makes it not look like trash
+            // ReSharper disable once ConvertIfStatementToNullCoalescingExpression
+            if(lastMatch == null) {
+                lastMatch = new LastMatch {
+                    UserId = user.UserId,
+                };
+                this.database.LastMatches.Add(lastMatch);
+            }
+
+            lastMatch.Timestamp = TimestampHelper.Timestamp;
+
+            await this.database.SaveChangesAsync();
+            return this.Ok("[{\"StatusCode\":200}]");
+        }
+
+        [HttpGet("playersInPodCount")]
+        [HttpGet("totalPlayerCount")]
+        public async Task<IActionResult> TotalPlayerCount() {
+            int recentMatches = await this.database.LastMatches
+                .Where(l => TimestampHelper.Timestamp - l.Timestamp < 60)
+                .CountAsync();
+
+            return this.Ok(recentMatches.ToString());
+        }
+    }
+}

ProjectLighthouse/Controllers/UserController.cs

@@ -116,11 +116,5 @@ namespace ProjectLighthouse.Controllers {
             if(database.ChangeTracker.HasChanges()) await database.SaveChangesAsync(); // save the user to the database if we changed anything
             return this.Ok();
         }
-
-        [HttpPost("match")]
-        [Produces("text/json")]
-        public IActionResult Match() {
-            return this.Ok("[{\"StatusCode\":200}]");
-        }
     }
 }

ProjectLighthouse/Helpers/TimestampHelper.cs

@@ -0,0 +1,7 @@
+using System;
+
+namespace ProjectLighthouse.Helpers {
+    public static class TimestampHelper {
+        public static long Timestamp => (long)DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
+    }
+}