fix #362

src/VaultSharp/V1/SecretsEngines/Database/ConnectionConfigModelJsonConverter.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using VaultSharp.V1.SecretsEngines.Database.Models;
+using VaultSharp.V1.SecretsEngines.Database.Models.PostgreSQL;
+
+namespace VaultSharp.V1.SecretsEngines.Database
+{
+    /// <summary>
+    /// Converts the <see cref="ConnectionConfigModel" /> object from JSON.
+    /// </summary>
+    internal class ConnectionConfigModelJsonConverter : JsonConverter<ConnectionConfigModel>
+    {
+        public override void Write(Utf8JsonWriter writer, ConnectionConfigModel value, JsonSerializerOptions serializer)
+        {
+            // VERY IMPORTANT
+            // This will only work if the converter is registered programmatically and not via attributes
+            // Via attributes, the code goes into a stack overflow exception.
+            JsonSerializer.Serialize(writer, value);
+        }
+
+        public override ConnectionConfigModel Read(ref Utf8JsonReader reader, Type type, JsonSerializerOptions options)
+        {
+            if (reader.TokenType != JsonTokenType.StartObject)
+            {
+                throw new JsonException();
+            }
+
+            using (var jsonDocument = JsonDocument.ParseValue(ref reader))
+            {
+                if (!jsonDocument.RootElement.TryGetProperty("plugin_name",
+                        out var pluginNameProperty))
+                {
+                    throw new JsonException();
+                }
+
+                string pluginName = pluginNameProperty.GetString();
+                var jsonString = jsonDocument.RootElement.GetRawText();
+
+                if (pluginName.Equals("postgresql-database-plugin"))
+                {
+                    return JsonSerializer.Deserialize<PostgreSQLConnectionConfigModel>(jsonString);
+                }
+
+                return JsonSerializer.Deserialize<ConnectionConfigModel>(jsonString);
+            }
+        }
+    }
+}

src/VaultSharp/V1/SecretsEngines/Database/DatabaseSecretsEngineProvider.cs

@@ -19,6 +19,38 @@ public async Task ConfigureConnectionAsync(string connectionName, ConnectionConf
         {
             await _polymath.MakeVaultApiRequest(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/config/" + connectionName, HttpMethod.Post, requestData: connectionConfigModel).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
         }
+
+        public async Task<Secret<ConnectionConfigModel>> ReadConnectionConfigAsync(string connectionName, string mountPoint = null, string wrapTimeToLive = null)
+        {
+            Checker.NotNull(connectionName, "connectionName");
+
+            return await _polymath.MakeVaultApiRequest<Secret<ConnectionConfigModel>>(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/config/" + connectionName, HttpMethod.Get, wrapTimeToLive: wrapTimeToLive).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
+
+        public async Task<Secret<ListInfo>> ReadAllConnectionsAsync(string mountPoint = null, string wrapTimeToLive = null)
+        {
+            return await _polymath.MakeVaultApiRequest<Secret<ListInfo>>(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/config?list=true", HttpMethod.Get, wrapTimeToLive: wrapTimeToLive).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
+
+        public async Task DeleteConnectionAsync(string connectionName, string mountPoint = null)
+        {
+            await _polymath.MakeVaultApiRequest(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/config/" + connectionName, HttpMethod.Delete).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
+
+        public async Task ResetConnectionAsync(string connectionName, string mountPoint = null)
+        {
+            await _polymath.MakeVaultApiRequest(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/reset/" + connectionName, HttpMethod.Post).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
+
+        public async Task ReloadPluginAsync(string pluginName, string mountPoint = null)
+        {
+            await _polymath.MakeVaultApiRequest(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/reload/" + pluginName, HttpMethod.Post).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
+
+        public async Task RotateRootCredentialsAsync(string connectionName, string mountPoint = null)
+        {
+            await _polymath.MakeVaultApiRequest(mountPoint ?? _polymath.VaultClientSettings.SecretsEngineMountPoints.Database, "/rotate-root/" + connectionName, HttpMethod.Post).ConfigureAwait(_polymath.VaultClientSettings.ContinueAsyncTasksOnCapturedContext);
+        }
 
         public async Task CreateRoleAsync(string roleName, Role role, string mountPoint = null)
         {

src/VaultSharp/V1/SecretsEngines/Database/IDatabaseSecretsEngine.cs

@@ -26,6 +26,96 @@ public interface IDatabaseSecretsEngine
         /// <returns>The task</returns>
         Task ConfigureConnectionAsync(string connectionName, ConnectionConfigModel connectionConfigModel, string mountPoint = null);
 
+        /// <summary>
+        /// This endpoint returns the configuration settings for a connection.
+        /// </summary>
+        /// <param name="connectionName">
+        /// <para>[required]</para>
+        /// Specifies the name for this database connection.
+        /// </param>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the Database backend. Defaults to <see cref="SecretsEngineMountPoints.Database" />
+        /// Provide a value only if you have customized the mount point.</param>
+        /// <param name="wrapTimeToLive">
+        /// <para>[optional]</para>
+        /// The TTL for the token and can be either an integer number of seconds or a string duration of seconds.
+        /// </param>
+        /// <returns>The role info.</returns>
+        Task<Secret<ConnectionConfigModel>> ReadConnectionConfigAsync(string connectionName, string mountPoint = null, string wrapTimeToLive = null);
+
+        /// <summary>
+        /// This endpoint returns a list of available connections. 
+        /// Only the connection names are returned, not any values.
+        /// </summary>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the Database backend. Defaults to <see cref="SecretsEngineMountPoints.Database" />
+        /// Provide a value only if you have customized the mount point.</param>   
+        /// <param name="wrapTimeToLive">
+        /// <para>[optional]</para>
+        /// The TTL for the token and can be either an integer number of seconds or a string duration of seconds.
+        /// </param>
+        /// <returns>The connection names.</returns>
+        Task<Secret<ListInfo>> ReadAllConnectionsAsync(string mountPoint = null, string wrapTimeToLive = null);
+
+        /// <summary>
+        /// Deletes the connection config.
+        /// </summary>
+        /// <param name="connectionName">
+        /// <para>[required]</para>
+        /// Specifies the name for this database connection.
+        /// </param>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the AD backend. Defaults to <see cref="SecretsEngineMountPoints.ActiveDirectory" />
+        /// Provide a value only if you have customized the mount point.</param>
+        /// <returns>The task</returns>
+        Task DeleteConnectionAsync(string connectionName, string mountPoint = null);
+
+        /// <summary>
+        /// This endpoint closes a connection and it's underlying plugin and restarts it
+        /// with the configuration stored in the barrier.
+        /// </summary>
+        /// <param name="connectionName">
+        /// <para>[required]</para>
+        /// Specifies the name for this database connection.
+        /// </param>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the AD backend. Defaults to <see cref="SecretsEngineMountPoints.ActiveDirectory" />
+        /// Provide a value only if you have customized the mount point.</param>
+        /// <returns>The task</returns>
+        Task ResetConnectionAsync(string connectionName, string mountPoint = null);
+
+        /// <summary>
+        /// This endpoint performs the same operation as reset connection but for all connections
+        /// that reference a specific plugin name.
+        /// This can be useful to restart a specific plugin after it's been upgraded in the plugin catalog.
+        /// </summary>
+        /// <param name="pluginName">
+        /// <para>[required]</para>
+        ///  Specifies the name of the plugin for which all connections should be reset. 
+        /// </param>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the AD backend. Defaults to <see cref="SecretsEngineMountPoints.ActiveDirectory" />
+        /// Provide a value only if you have customized the mount point.</param>
+        /// <returns>The task</returns>
+        Task ReloadPluginAsync(string pluginName, string mountPoint = null);
+
+        /// <summary>
+        /// This endpoint is used to rotate the "root" user credentials stored for the database connection.
+        /// This user must have permissions to update its own password.
+        /// Use caution: the root user's password will not be accessible once rotated so
+        /// it is highly recommended that you create a user for Vault to utilize
+        /// rather than using the actual root user.
+        /// </summary>
+        /// <param name="connectionName">
+        /// <para>[required]</para>
+        /// Specifies the name for this database connection.
+        /// </param>
+        /// <param name="mountPoint"><para>[optional]</para>
+        /// The mount point for the AD backend. Defaults to <see cref="SecretsEngineMountPoints.ActiveDirectory" />
+        /// Provide a value only if you have customized the mount point.</param>
+        /// <returns>The task</returns>
+        Task RotateRootCredentialsAsync(string connectionName, string mountPoint = null);
+
         /// <summary>
         /// This endpoint creates or updates a role definition.
         /// </summary>

src/VaultSharp/V1/SecretsEngines/Database/Models/ConnectionConfigModel.cs

@@ -1,11 +1,20 @@
 using System.Collections.Generic;
 using System.Text.Json.Serialization;
+using VaultSharp.V1.SecretsEngines.Database.Models.PostgreSQL;
 
 namespace VaultSharp.V1.SecretsEngines.Database.Models
 {
     /// <summary>
     /// Connection Config Model.
     /// </summary>
+
+    // VERY IMPORTANT: Do not use Attribute based converter notation.
+    // It is a short-coming of STJ to go into a infinite loop 
+    // https://github.com/dotnet/runtime/issues/46372
+    // Use programmatic registration.
+    // [JsonConverter(typeof(ConnectionConfigModelJsonConverter))]
+
+    [JsonDerivedType(typeof(PostgreSQLConnectionConfigModel))]
     public class ConnectionConfigModel
     {
         /// <summary>

src/VaultSharp/V1/SecretsEngines/Database/Models/PostgreSQL/PostgreSQLConnectionConfigModel.cs

@@ -7,6 +7,7 @@ namespace VaultSharp.V1.SecretsEngines.Database.Models.PostgreSQL
     /// </summary>
     public class PostgreSQLConnectionConfigModel : ConnectionConfigModel
     {
+        [JsonIgnore]
         public DatabaseProviderType DatabaseProviderType { get; } = DatabaseProviderType.PostgreSQL;
 
         /// <summary>

src/VaultSharp/VaultClient.cs

@@ -1,5 +1,7 @@
-using VaultSharp.Core;
+using System.Text.Json;
+using VaultSharp.Core;
 using VaultSharp.V1;
+using VaultSharp.V1.SecretsEngines.Database;
 
 namespace VaultSharp
 {
@@ -16,6 +18,12 @@ public class VaultClient : IVaultClient
         /// <param name="vaultClientSettings"></param>
         public VaultClient(VaultClientSettings vaultClientSettings)
         {
+            // Due to the bug https://github.com/dotnet/runtime/issues/46372
+            // Register some converters programmatically here
+            JsonSerializerOptions.Default.Converters.Add(new ConnectionConfigModelJsonConverter());
+
+            // raja todo: Change AuditBackend converter from Attribute to this.
+
             polymath = new Polymath(vaultClientSettings);
             V1 = new VaultClientV1(polymath);
         }