Support the .vault-token file

Author: kevinwell

src/Configuration/Vault/src/ConfigurationManagerExtensions.cs

@@ -1,5 +1,6 @@
 namespace ClickView.GoodStuff.Configuration.Vault;
 
+using System;
 using Microsoft.Extensions.Configuration;
 
 public static class ConfigurationManagerExtensions
@@ -16,6 +17,8 @@ public static IConfigurationManager AddVault(this IConfigurationManager configur
     {
         ArgumentNullException.ThrowIfNull(configurationManager);
 
+        configurationManager.Sources.Insert(0, new VaultTokenFileConfigurationSource());
+
         var options = GetOptions(configurationManager);
 
         configure?.Invoke(options);

src/Configuration/Vault/src/VaultTokenFileConfigurationProvider.cs

@@ -0,0 +1,19 @@
+namespace ClickView.GoodStuff.Configuration.Vault;
+
+using Microsoft.Extensions.Configuration;
+
+internal class VaultTokenFileConfigurationProvider : ConfigurationProvider
+{
+    public override void Load()
+    {
+        var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".vault-token");
+
+        if (!File.Exists(path))
+            return;
+
+        var token = File.ReadAllText(path).Trim();
+
+        if (!string.IsNullOrEmpty(token))
+            Data["Vault:Token"] = token;
+    }
+}

src/Configuration/Vault/src/VaultTokenFileConfigurationSource.cs

@@ -0,0 +1,8 @@
+namespace ClickView.GoodStuff.Configuration.Vault;
+
+using Microsoft.Extensions.Configuration;
+
+internal class VaultTokenFileConfigurationSource : IConfigurationSource
+{
+    public IConfigurationProvider Build(IConfigurationBuilder builder) => new VaultTokenFileConfigurationProvider();
+}