Added validation and fixed errors

SchengenVisaApi/ApplicationLayer/Services/AuthServices/Requests/Validation/AuthDataValidator.cs

@@ -0,0 +1,32 @@
+using ApplicationLayer.Services.AuthServices.Common;
+using ApplicationLayer.Services.AuthServices.NeededServices;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.AuthServices.Requests.Validation
+{
+    public class AuthDataValidator : AbstractValidator<AuthData>
+    {
+        public AuthDataValidator(IUsersRepository users)
+        {
+            RuleFor(d => d.Email)
+                .NotEmpty()
+                .WithMessage("Email can not be empty")
+                .EmailAddress()
+                .WithMessage("Email must be valid")
+                .MaximumLength(ConfigurationConstraints.EmailLength)
+                .WithMessage($"Email length must be less than {ConfigurationConstraints.EmailLength}")
+                .MustAsync(async (email, ct) =>
+                {
+                    return await users.FindByEmailAsync(email, ct) is null;
+                })
+                .WithMessage("Email already exists");
+
+            RuleFor(d => d.Password)
+                .NotEmpty()
+                .WithMessage("Password can not be empty")
+                .MaximumLength(ConfigurationConstraints.PasswordLength)
+                .WithMessage($"Password length must be less than {ConfigurationConstraints.PasswordLength}");
+        }
+    }
+}