/// <inheritdoc/>
public IPamTransaction Start(
IPamMessageHandler messageHandler,
string?user = null)
{
var conversationHandler = _configuration.CreateMessaging?.Invoke(messageHandler)
?? new PamConversationHandler(messageHandler);
PamStatus ConversationCallback(int messageCount, IntPtr messages, out IntPtr responseArrayPtr, IntPtr appDataPtr)
{
try
{
return(conversationHandler.Handle(messageCount, messages, out responseArrayPtr, appDataPtr));
}
catch (Exception ex)
{
_logger?.LogError(ex, "Conversation failed with error message {0}", ex.Message);
responseArrayPtr = IntPtr.Zero;
return(PamStatus.PAM_CONV_ERR);
}
}
var conversation = new PamConv(ConversationCallback);
CheckStatus(_interop.pam_start(_configuration.ServiceName, user, conversation, out var pamHandle));
return(new PamTransaction(_interop, pamHandle, conversation, _logger));
}
/// <summary>
/// Sends the messages to the <see cref="IPamMessageHandler"/>.
/// </summary>
/// <param name="messages">The messages to process.</param>
/// <param name="messageHandler">The message handler that gets the messages.</param>
/// <returns>The responses for the messages.</returns>
private static IEnumerable <IPamResponse> ProcessMessages(IEnumerable <IPamMessage> messages, IPamMessageHandler messageHandler)
{
foreach (var message in messages)
{
switch (message)
{
case PamMessage <string> msg when msg.MessageStyle == PamMessageStyle.PAM_TEXT_INFO:
yield return(new PamNoResponse(messageHandler.TextInfo(msg.Payload)));
break;
case PamMessage <string> msg when msg.MessageStyle == PamMessageStyle.PAM_ERROR_MSG:
yield return(new PamNoResponse(messageHandler.ErrorMsg(msg.Payload)));
break;
case PamMessage <string> msg when msg.MessageStyle == PamMessageStyle.PAM_PROMPT_ECHO_OFF:
yield return(new PamTextResponse(messageHandler.PromptEchoOff(msg.Payload)));
break;
case PamMessage <string> msg when msg.MessageStyle == PamMessageStyle.PAM_PROMPT_ECHO_ON:
yield return(new PamTextResponse(messageHandler.PromptEchoOn(msg.Payload)));
break;
case PamMessage <string> msg when msg.MessageStyle == PamMessageStyle.PAM_RADIO_TYPE:
yield return(new PamTextResponse(messageHandler.RadioType(msg.Payload)));
break;
case PamMessage <PamBinaryData> msg when msg.MessageStyle == PamMessageStyle.PAM_BINARY_PROMPT:
yield return(new PamBinaryResponse(messageHandler.BinaryPrompt(msg.Payload)));
break;
default:
throw new NotSupportedException($"Message style {message.MessageStyle.ToString()} not supported.");
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="PamConversationHandler"/> class.
/// </summary>
/// <param name="messageHandler">The message handler that gets the messages.</param>
public PamConversationHandler(IPamMessageHandler messageHandler)
{
_messageHandler = messageHandler ?? throw new ArgumentNullException(nameof(messageHandler));
}
