Add minimum length as const in ApiKeyValidationCheck

(cherry picked from commit b06269544cfa11015f3fb938fd8c2ef07d9cac4a)

Closes #2565

src/NzbDrone.Core/HealthCheck/Checks/ApiKeyValidationCheck.cs

@@ -10,6 +10,8 @@ namespace NzbDrone.Core.HealthCheck.Checks
     [CheckOn(typeof(ConfigSavedEvent))]
     public class ApiKeyValidationCheck : HealthCheckBase
     {
+        private const int MinimumLength = 20;
+
         private readonly IConfigFileProvider _configFileProvider;
         private readonly Logger _logger;
 
@@ -22,11 +24,11 @@ namespace NzbDrone.Core.HealthCheck.Checks
 
         public override HealthCheck Check()
         {
-            if (_configFileProvider.ApiKey.Length < 20)
+            if (_configFileProvider.ApiKey.Length < MinimumLength)
             {
-                _logger.Warn("Please update your API key to be at least 20 characters long. You can do this via settings or the config file");
+                _logger.Warn("Please update your API key to be at least {0} characters long. You can do this via settings or the config file", MinimumLength);
 
-                return new HealthCheck(GetType(), HealthCheckResult.Warning, _localizationService.GetLocalizedString("ApiKeyValidationHealthCheckMessage"), "#invalid-api-key");
+                return new HealthCheck(GetType(), HealthCheckResult.Warning, string.Format(_localizationService.GetLocalizedString("ApiKeyValidationHealthCheckMessage"), MinimumLength), "#invalid-api-key");
             }
 
             return new HealthCheck(GetType());

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

@@ -31,7 +31,7 @@
   "AnalyticsEnabledHelpTextWarning": "Requires restart to take effect",
   "AnyEditionOkHelpText": "Readarr will automatically switch to the edition best matching downloaded files",
   "ApiKeyHelpTextWarning": "Requires restart to take effect",
-  "ApiKeyValidationHealthCheckMessage": "Please update your API key to be at least 20 characters long. You can do this via settings or the config file",
+  "ApiKeyValidationHealthCheckMessage": "Please update your API key to be at least {0} characters long. You can do this via settings or the config file",
   "AppDataDirectory": "AppData directory",
   "AppDataLocationHealthCheckMessage": "Updating will not be possible to prevent deleting AppData on Update",
   "ApplicationURL": "Application URL",