New: Add application URL to host configuration settings

(cherry picked from commit 762042ba97c2ae689cee32d8e66a458f6d7a8adc)

frontend/src/Settings/General/HostSettings.js

@@ -21,6 +21,7 @@ function HostSettings(props) {
     port,
     urlBase,
     instanceName,
+    applicationUrl,
     enableSsl,
     sslPort,
     sslCertPath,
@@ -95,6 +96,21 @@ function HostSettings(props) {
         />
       </FormGroup>
 
+      <FormGroup
+        advancedSettings={advancedSettings}
+        isAdvanced={true}
+      >
+        <FormLabel>Application URL</FormLabel>
+
+        <FormInputGroup
+          type={inputTypes.TEXT}
+          name="applicationUrl"
+          helpText="This application's external URL including http(s)://, port and URL base"
+          onChange={onInputChange}
+          {...applicationUrl}
+        />
+      </FormGroup>
+
       <FormGroup
         advancedSettings={advancedSettings}
         isAdvanced={true}

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/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
             };
         }
     }