Fix: Sign-in user if exists

src/Infrastructure/Services/UserService.cs

@@ -84,8 +84,12 @@ public class UserService(UserManager<ApplicationUser> userManager, IHttpContextA
     }
 }
 
+// If we need to add special characters we can alternate between 2 pools.
 public class RandomGenerator
 {
+    // For the moment, numbers and special characters don't work because
+    // the random generator is designed to handle a single integer.
+    // We can modify this in the future.
     private const string LetterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                        + "0123456789"
                                        + "!@#$%^&*()_+"

src/Web/Controllers/GoogleController.cs

@@ -39,16 +39,22 @@ public class GoogleController(
             FamilyName = claims.FirstOrDefault(c => c.Type == ClaimTypes.Surname)?.Value
         };
         
-        await userService.CreateUserAsync(userInfo); // TODO: Don't create user if already exists
+        var claimsIdentity = new ClaimsIdentity(new List<Claim>
-
-        await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
         {
             new(ClaimTypes.Name, userInfo.Name),
             new(ClaimTypes.Email, userInfo.Email),
             new(ClaimTypes.GivenName, userInfo.GivenName),
             new(ClaimTypes.Surname, userInfo.FamilyName)
-        }, CookieAuthenticationDefaults.AuthenticationScheme)));
+        }, CookieAuthenticationDefaults.AuthenticationScheme);
         
+        if (await userService.FindUserByEmailAsync(userInfo.Email) != null) // TODO: Do we need to check for null ?
+        {
+            await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimsIdentity));
+            return Redirect("/");
+        }
+        
+        await userService.CreateUserAsync(userInfo);
+        await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimsIdentity));
         return Redirect("/");
     }
 }

src/Web/Program.cs

@@ -72,11 +72,11 @@ builder.Services.AddAuthentication(options =>
 // Password hashing
 builder.Services.AddIdentity<ApplicationUser, IdentityRole>(options =>
     {
-        options.Password.RequireDigit = true;
+        options.Password.RequireDigit = false;
         options.Password.RequireLowercase = false;
-        options.Password.RequireUppercase = true;
+        options.Password.RequireUppercase = false;
-        options.Password.RequireNonAlphanumeric = true;
+        options.Password.RequireNonAlphanumeric = false;
-        options.Password.RequiredLength = 8;
+        options.Password.RequiredLength = 16;
     })
     .AddEntityFrameworkStores<ApplicationDbContext>()
     .AddDefaultTokenProviders();