fix: migrate to IDbContextFactory and remove direct AppDbContext from DI (#11)

Reviewed-on: #11
Co-authored-by: Marek Jasiński <jasins.marek@gmail.com>
Co-committed-by: Marek Jasiński <jasins.marek@gmail.com>

src/NexusReader.Application/Security/Authorization/ProUserHandler.cs

@@ -2,16 +2,19 @@ using System.Security.Claims;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using NexusReader.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+using NexusReader.Data.Persistence;
 
 namespace NexusReader.Application.Security.Authorization;
 
 public class ProUserHandler : AuthorizationHandler<ProUserRequirement>
 {
-    private readonly UserManager<NexusUser> _userManager;
-
-    public ProUserHandler(UserManager<NexusUser> userManager)
+    private readonly IDbContextFactory<AppDbContext> _dbContextFactory;
+    
+    public ProUserHandler(IDbContextFactory<AppDbContext> dbContextFactory)
     {
-        _userManager = userManager;
+        _dbContextFactory = dbContextFactory;
     }
 
     protected override async Task HandleRequirementAsync(
@@ -24,14 +27,18 @@ public class ProUserHandler : AuthorizationHandler<ProUserRequirement>
             return;
         }
 
-        var user = await _userManager.FindByIdAsync(userId);
+        using var db = _dbContextFactory.CreateDbContext();
+        var user = await db.Users
+            .Include(u => u.SubscriptionPlan)
+            .FirstOrDefaultAsync(u => u.Id == userId);
+            
         if (user == null)
         {
             return;
         }
 
-        // Rule 1: Explicit Pro plan
-        if (user.SubscriptionPlanId == SubscriptionPlan.ProId)
+        // Rule 1: Unlimited access
+        if (user.SubscriptionPlan?.IsUnlimitedTokens == true)
         {
             context.Succeed(requirement);
             return;