using Xceed.SSH.Client;
using Xceed.SSH.Core;
using Xceed.SSH.Protocols;
using Xceed.FileSystem;

namespace DocumentationExamples.SSH
{
  class PublicKeyFingerprint1
  {
    private static void OnHostKeyReceived( object sender, HostKeyReceivedEventArgs e )
    {
      /* The server's fingerprint is available as both a both array or a string */
      byte[] hostKeyMD5Fingerprint = e.HostKeyMD5Fingerprint;
      string hostKeyMD5FingerprintString = e.HostKeyMD5FingerprintString;

      /* TODO: Perform your fingerprint validation... */

      /* We can choose to accept or reject the server's key. Here we accept. */
      e.AcceptHostKey = true;
    }

    static void Example()
    {
      string host = "sftptest.dreamhosters.com";
      string username = "snippet_sftp";
      string password = "9MNfGgSx";

      SSHClient ssh = new SSHClient();

      // Ask to be notified when we receive the server's key and other information
      ssh.HostKeyReceived += OnHostKeyReceived;

      try
      {
        ssh.Connect( host );
      }
      // These exception can be thrown by a call to Connect()
      catch( SSHIdentificationStringException )
      {
        // This means the component was unable to identify the server as a SSH server
        throw;
      }
      catch( SSHKeyExchangeException )
      {
        // This means the client and the server failed to negotiate terms for a connection
        // This usually indicates an interoperability problem with certain old or broken servers
        throw;
      }
      catch( UnsupportedSSHProtocolException )
      {
        // This means the server is using a version of the SSH protocol that is not supported.
        throw;
      }
      catch( SSHTimeoutException )
      {
        // This means the client did not receive a response from the server within the required
        // time. This usually indicate a problem with the Internet connection or an interoperability
        // problem between the server and the client.
        throw;
      }

      try
      {
        try
        {
          ssh.Authenticate( username, password );

          /* ... */
        }
        // These exceptions can be thrown by a call to Authenticate()
        catch( SSHIncorrectPasswordException )
        {
          // This means the authentication method is supported by the server but the password
          // was incorrect for the specified username 
          throw;
        }
        catch( SSHAuthenticationPartialSuccessException )
        {
          // This means the authentication was successful but the server requires an additional authentication
          // using another method specified in the exception information
          throw;
        }
        catch( SSHUnsupportedAuthenticationMethodException )
        {
          // This means the authentication method is not supported by the server
          throw;
        }
        catch( SSHAuthenticationFailedException )
        {
          // This means the authentication method failed
          throw;
        }
      }
      finally
      {
        // Always make sure to disconnect from the server when the connection is no longer needed
        ssh.Disconnect();
      }
    }
  }
}