#region License
/*
 * ServerSslConfiguration.cs
 *
 * The MIT License
 *
 * Copyright (c) 2014 liryna
 * Copyright (c) 2014-2017 sta.blockhead
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion

#region Authors
/*
 * Authors:
 * - Liryna <liryna.stark@gmail.com>
 */
#endregion

using System;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

namespace WebSocketSharp.Net
{
  /// <summary>
  /// Stores the parameters for the <see cref="SslStream"/> used by servers.
  /// </summary>
  public class ServerSslConfiguration
  {
    #region Private Fields

    private bool                                _checkCertRevocation;
    private bool                                _clientCertRequired;
    private RemoteCertificateValidationCallback _clientCertValidationCallback;
    private SslProtocols                        _enabledSslProtocols;
    private X509Certificate2                    _serverCert;

    #endregion

    #region Public Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="ServerSslConfiguration"/> class.
    /// </summary>
    public ServerSslConfiguration ()
    {
      _enabledSslProtocols = SslProtocols.Default;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ServerSslConfiguration"/> class
    /// with the specified <paramref name="serverCertificate"/>.
    /// </summary>
    /// <param name="serverCertificate">
    /// A <see cref="X509Certificate2"/> that represents the certificate used to
    /// authenticate the server.
    /// </param>
    public ServerSslConfiguration (X509Certificate2 serverCertificate)
    {
      _serverCert = serverCertificate;
      _enabledSslProtocols = SslProtocols.Default;
    }

    /// <summary>
    /// Copies the parameters from the specified <paramref name="configuration"/> to
    /// a new instance of the <see cref="ServerSslConfiguration"/> class.
    /// </summary>
    /// <param name="configuration">
    /// A <see cref="ServerSslConfiguration"/> from which to copy.
    /// </param>
    /// <exception cref="ArgumentNullException">
    /// <paramref name="configuration"/> is <see langword="null"/>.
    /// </exception>
    public ServerSslConfiguration (ServerSslConfiguration configuration)
    {
      if (configuration == null)
        throw new ArgumentNullException ("configuration");

      _checkCertRevocation = configuration._checkCertRevocation;
      _clientCertRequired = configuration._clientCertRequired;
      _clientCertValidationCallback = configuration._clientCertValidationCallback;
      _enabledSslProtocols = configuration._enabledSslProtocols;
      _serverCert = configuration._serverCert;
    }

    #endregion

    #region Public Properties

    /// <summary>
    /// Gets or sets a value indicating whether the certificate revocation
    /// list is checked during authentication.
    /// </summary>
    /// <value>
    ///   <para>
    ///   <c>true</c> if the certificate revocation list is checked during
    ///   authentication; otherwise, <c>false</c>.
    ///   </para>
    ///   <para>
    ///   The default value is <c>false</c>.
    ///   </para>
    /// </value>
    public bool CheckCertificateRevocation {
      get {
        return _checkCertRevocation;
      }

      set {
        _checkCertRevocation = value;
      }
    }

    /// <summary>
    /// Gets or sets a value indicating whether the client is asked for
    /// a certificate for authentication.
    /// </summary>
    /// <value>
    ///   <para>
    ///   <c>true</c> if the client is asked for a certificate for
    ///   authentication; otherwise, <c>false</c>.
    ///   </para>
    ///   <para>
    ///   The default value is <c>false</c>.
    ///   </para>
    /// </value>
    public bool ClientCertificateRequired {
      get {
        return _clientCertRequired;
      }

      set {
        _clientCertRequired = value;
      }
    }

    /// <summary>
    /// Gets or sets the callback used to validate the certificate
    /// supplied by the client.
    /// </summary>
    /// <remarks>
    /// The certificate is valid if the callback returns <c>true</c>.
    /// </remarks>
    /// <value>
    ///   <para>
    ///   A <see cref="RemoteCertificateValidationCallback"/> delegate that
    ///   invokes the method called for validating the certificate.
    ///   </para>
    ///   <para>
    ///   The default value is a delegate that invokes a method that
    ///   only returns <c>true</c>.
    ///   </para>
    /// </value>
    public RemoteCertificateValidationCallback ClientCertificateValidationCallback {
      get {
        if (_clientCertValidationCallback == null)
          _clientCertValidationCallback = defaultValidateClientCertificate;

        return _clientCertValidationCallback;
      }

      set {
        _clientCertValidationCallback = value;
      }
    }

    /// <summary>
    /// Gets or sets the protocols used for authentication.
    /// </summary>
    /// <value>
    ///   <para>
    ///   The <see cref="SslProtocols"/> enum values that represent
    ///   the protocols used for authentication.
    ///   </para>
    ///   <para>
    ///   The default value is <see cref="SslProtocols.Default"/>.
    ///   </para>
    /// </value>
    public SslProtocols EnabledSslProtocols {
      get {
        return _enabledSslProtocols;
      }

      set {
        _enabledSslProtocols = value;
      }
    }

    /// <summary>
    /// Gets or sets the certificate used to authenticate the server.
    /// </summary>
    /// <value>
    ///   <para>
    ///   A <see cref="X509Certificate2"/> or <see langword="null"/>
    ///   if not specified.
    ///   </para>
    ///   <para>
    ///   That instance represents an X.509 certificate.
    ///   </para>
    /// </value>
    public X509Certificate2 ServerCertificate {
      get {
        return _serverCert;
      }

      set {
        _serverCert = value;
      }
    }

    #endregion

    #region Private Methods

    private static bool defaultValidateClientCertificate (
      object sender,
      X509Certificate certificate,
      X509Chain chain,
      SslPolicyErrors sslPolicyErrors
    )
    {
      return true;
    }

    #endregion
  }
}