New: Add application URL to host configuration settings

Fixes #1816
Closes #1817

(cherry picked from commit 762042ba97c2ae689cee32d8e66a458f6d7a8adc)

src/NzbDrone.Core/Configuration/ConfigService.cs

@@ -410,6 +410,8 @@ namespace NzbDrone.Core.Configuration
         public CertificateValidationType CertificateValidation =>
             GetValueEnum("CertificateValidation", CertificateValidationType.Enabled);
 
+        public string ApplicationUrl => GetValue("ApplicationUrl", string.Empty);
+
         private string GetValue(string key)
         {
             return GetValue(key, string.Empty);

src/NzbDrone.Core/Configuration/IConfigService.cs

@@ -97,5 +97,6 @@ namespace NzbDrone.Core.Configuration
         int BackupRetention { get; }
 
         CertificateValidationType CertificateValidation { get; }
+        string ApplicationUrl { get; }
     }
 }

src/NzbDrone.Core/Localization/Core/en.json

@@ -34,6 +34,8 @@
   "ApiKeyHelpTextWarning": "Requires restart to take effect",
   "AppDataDirectory": "AppData directory",
   "AppDataLocationHealthCheckMessage": "Updating will not be possible to prevent deleting AppData on Update",
+  "ApplicationURL": "Application URL",
+  "ApplicationUrlHelpText": "This application's external URL including http(s)://, port and URL base",
   "ApplyTags": "Apply Tags",
   "ApplyTagsHelpTexts1": "How to apply tags to the selected author",
   "ApplyTagsHelpTexts2": "Add: Add the tags the existing list of tags",

src/Readarr.Api.V1/Config/HostConfigResource.cs

@@ -26,6 +26,7 @@ namespace Readarr.Api.V1.Config
         public string SslCertPassword { get; set; }
         public string UrlBase { get; set; }
         public string InstanceName { get; set; }
+        public string ApplicationUrl { get; set; }
         public bool UpdateAutomatically { get; set; }
         public UpdateMechanism UpdateMechanism { get; set; }
         public string UpdateScriptPath { get; set; }
@@ -82,7 +83,8 @@ namespace Readarr.Api.V1.Config
                 CertificateValidation = configService.CertificateValidation,
                 BackupFolder = configService.BackupFolder,
                 BackupInterval = configService.BackupInterval,
-                BackupRetention = configService.BackupRetention
+                BackupRetention = configService.BackupRetention,
+                ApplicationUrl = configService.ApplicationUrl
             };
         }
     }