Implemented apikey backend

Moonlight.ApiServer/Http/Middleware/ApiAuthenticationMiddleware.cs

@@ -0,0 +1,64 @@
+using System.Text.Json;
+using MoonCore.Authentication;
+using MoonCore.Extended.Abstractions;
+using Moonlight.ApiServer.Database.Entities;
+
+namespace Moonlight.ApiServer.Http.Middleware;
+
+public class ApiAuthenticationMiddleware
+{
+    private readonly RequestDelegate Next;
+    private readonly ILogger<ApiAuthenticationMiddleware> Logger;
+
+    public ApiAuthenticationMiddleware(RequestDelegate next, ILogger<ApiAuthenticationMiddleware> logger)
+    {
+        Next = next;
+        Logger = logger;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        await Authenticate(context);
+        await Next(context);
+    }
+
+    public Task Authenticate(HttpContext context)
+    {
+        var request = context.Request;
+        
+        if(!request.Headers.ContainsKey("Authorization"))
+            return Task.CompletedTask;
+        
+        if(request.Headers["Authorization"].Count == 0)
+            return Task.CompletedTask;
+
+        var authHeader = request.Headers["Authorization"].First();
+        
+        if(string.IsNullOrEmpty(authHeader))
+            return Task.CompletedTask;
+
+        var parts = authHeader.Split(" ");
+        
+        if(parts.Length != 2)
+            return Task.CompletedTask;
+
+        var bearerValue = parts[1];
+        
+        if(!bearerValue.StartsWith("api_"))
+            return Task.CompletedTask;
+        
+        if(bearerValue.Length != "api_".Length + 32)
+            return Task.CompletedTask;
+
+        var apiKeyRepo = context.RequestServices.GetRequiredService<DatabaseRepository<ApiKey>>();
+        var apiKey = apiKeyRepo.Get().FirstOrDefault(x => x.Secret == bearerValue);
+        
+        if(apiKey == null)
+            return Task.CompletedTask;
+
+        var permissions = JsonSerializer.Deserialize<string[]>(apiKey.PermissionsJson) ?? [];
+        context.User = new PermClaimsPrinciple(permissions);
+        
+        return Task.CompletedTask;
+    }
+}