Add Config Validator + Bug Fixing

UmlautAdaptarr/Validator/GlobalInstanceOptionsValidator.cs

@@ -0,0 +1,46 @@
+using FluentValidation;
+using System.Net;
+using UmlautAdaptarr.Options.ArrOptions.InstanceOptions;
+
+namespace UmlautAdaptarr.Validator
+{
+    public class GlobalInstanceOptionsValidator : AbstractValidator<GlobalInstanceOptions>
+    {
+        public GlobalInstanceOptionsValidator()
+        {
+            RuleFor(x => x.Enabled).NotNull();
+
+            When(x => x.Enabled, () =>
+            {
+
+                RuleFor(x => x.Host)
+                    .NotEmpty().WithMessage("Host is required when Enabled is true.")
+                    .Must(BeAValidUrl).WithMessage("Host must start with http:// or https:// and be a valid address.")
+                    .Must(BeReachable).WithMessage("Host is not reachable. Please check your Host or your UmlautAdaptrr Settings");
+
+                RuleFor(x => x.ApiKey)
+                    .NotEmpty().WithMessage("ApiKey is required when Enabled is true.");
+            });
+        }
+
+        private bool BeAValidUrl(string url)
+        {
+            return Uri.TryCreate(url, UriKind.Absolute, out var uriResult)
+                   && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
+        }
+
+        private bool BeReachable(string url)
+        {
+            try
+            {
+                var request = WebRequest.Create(url);
+                var response = (HttpWebResponse)request.GetResponse();
+                return response.StatusCode == HttpStatusCode.OK;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+    }
+}