Add descriptive exception for Azure-Vault service

src/OrchardCore.Cms.Web/appsettings.json

@@ -112,7 +112,7 @@
     // Add 'AddOrchardCoreAzureKeyVault()' to the Generic Host in 'CreateHostBuilder() section'.
     //"OrchardCore_KeyVault_Azure": {
     //  "KeyVaultName": "", // Set the name of your Azure Key Vault.
-    //  "ReloadInterval":  // Optional, timespan to wait between attempts at polling the Azure KeyVault for changes. Leave blank to disable reloading.
+    //  "ReloadInterval": null // Optional, timespan to wait between attempts at polling the Azure KeyVault for changes. Leave blank to disable reloading.
     //},
     // See https://docs.orchardcore.net/en/latest/docs/reference/modules/Users/Configuration/#custom-paths
     //"OrchardCore_Users": {

src/OrchardCore/OrchardCore.Configuration.KeyVault/Extensions/AzureKeyVaultConfigurationExtension.cs

@@ -40,10 +40,7 @@ public static IHostBuilder AddOrchardCoreAzureKeyVault(this IHostBuilder builder
         /// </summary>
         public static IWebHostBuilder AddOrchardCoreAzureKeyVault(this IWebHostBuilder builder, TokenCredential tokenCredential = null)
         {
-            if (builder == null)
-            {
-                throw new ArgumentNullException(nameof(builder));
-            }
+            ArgumentNullException.ThrowIfNull(builder);
 
             builder.ConfigureAppConfiguration((context, builder) =>
             {
@@ -62,10 +59,7 @@ public static IWebHostBuilder AddOrchardCoreAzureKeyVault(this IWebHostBuilder b
         public static ConfigurationManager AddOrchardCoreAzureKeyVault(
             this ConfigurationManager manager, TokenCredential tokenCredential = null)
         {
-            if (manager == null)
-            {
-                throw new ArgumentNullException(nameof(manager));
-            }
+            ArgumentNullException.ThrowIfNull(manager);
 
             // The 'ConfigurationManager' is a builder and also an 'IConfigurationRoot' allowing to
             // get values from the providers already added without having to build a configuration.
@@ -79,26 +73,29 @@ private static void AddOrchardCoreAzureKeyVault(
         {
             var keyVaultName = configuration["OrchardCore:OrchardCore_KeyVault_Azure:KeyVaultName"];
 
-            TimeSpan? reloadInterval = null;
-            if (double.TryParse(configuration["OrchardCore:OrchardCore_KeyVault_Azure:ReloadInterval"], out var interval))
+            if (string.IsNullOrEmpty(keyVaultName))
             {
-                reloadInterval = TimeSpan.FromSeconds(interval);
+                throw new Exception("The 'KeyVaultName' property is no configured. Please configure it by specifying the 'OrchardCore:OrchardCore_KeyVault_Azure:KeyVaultName' settings key.");
+            }
+
+            if (!Uri.TryCreate($"https://{keyVaultName}.vault.azure.net", UriKind.Absolute, out var keyVaultEndpointUri))
+            {
+                throw new Exception("Invalid value used for 'KeyVaultName' property. Please provide a valid key-vault name using the 'OrchardCore:OrchardCore_KeyVault_Azure:KeyVaultName' settings key.");
             }
 
-            var keyVaultEndpointUri = new Uri("https://" + keyVaultName + ".vault.azure.net");
             var configOptions = new AzureKeyVaultConfigurationOptions()
             {
                 Manager = new AzureKeyVaultSecretManager(),
-                ReloadInterval = reloadInterval,
             };
 
+            if (double.TryParse(configuration["OrchardCore:OrchardCore_KeyVault_Azure:ReloadInterval"], out var interval))
+            {
+                configOptions.ReloadInterval = TimeSpan.FromSeconds(interval);
+            }
+
             tokenCredential ??= new DefaultAzureCredential(includeInteractiveCredentials: true);
 
-            builder.AddAzureKeyVault(
-                keyVaultEndpointUri,
-                tokenCredential,
-                configOptions
-            );
+            builder.AddAzureKeyVault(keyVaultEndpointUri, tokenCredential, configOptions);
         }
     }
 }