New: Per Indexer Proxies

Fixes #281

src/NzbDrone.Core/IndexerProxies/HttpIndexerProxyBase.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using FluentValidation.Results;
+using NLog;
+using NzbDrone.Common.Cloud;
+using NzbDrone.Common.Http;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.IndexerProxies
+{
+    public abstract class HttpIndexerProxyBase<TSettings> : IndexerProxyBase<TSettings>
+        where TSettings : IIndexerProxySettings, new()
+    {
+        protected readonly IHttpClient _httpClient;
+        protected readonly IHttpRequestBuilderFactory _cloudRequestBuilder;
+        protected readonly Logger _logger;
+
+        public HttpIndexerProxyBase(IProwlarrCloudRequestBuilder cloudRequestBuilder, IHttpClient httpClient, Logger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+            _cloudRequestBuilder = cloudRequestBuilder.Services;
+        }
+
+        public override ValidationResult Test()
+        {
+            var failures = new List<ValidationFailure>();
+
+            var addresses = Dns.GetHostAddresses(Settings.Host);
+            if (!addresses.Any())
+            {
+                failures.Add(new NzbDroneValidationFailure("Host", "ProxyCheckResolveIpMessage"));
+            }
+
+            var request = PreRequest(_cloudRequestBuilder.Create()
+                                              .Resource("/ping")
+                                              .Build());
+
+            try
+            {
+                var response = _httpClient.Execute(request);
+
+                // We only care about 400 responses, other error codes can be ignored
+                if (response.StatusCode == HttpStatusCode.BadRequest)
+                {
+                    _logger.Error("Proxy Health Check failed: {0}", response.StatusCode);
+                    failures.Add(new NzbDroneValidationFailure("Host", "ProxyCheckBadRequestMessage"));
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex, "Proxy Health Check failed");
+                failures.Add(new NzbDroneValidationFailure("Host", "ProxyCheckFailedToTestMessage"));
+            }
+
+            return new ValidationResult(failures);
+        }
+    }
+}