// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include <e32std.h>

#include "POPS.H"

#include "POPSOP.H"

#include <pop3set.h>

#include <iapprefs.h>

#include <hash.h>

#include <pop3set.h>

#include <e32std.h>

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

#include "cpopsaslauthhelper.h"

#endif

#include "POPS.PAN"  // impp's own panic codes

#define KPeriod 30000000	// period of timer

// Specifies how long a socket is allowed to be inactive before we close it

// down. This handles the situation where the mail server closes down the

// connection, but we don't receive any indication of that. It has been seen

// when connected using GPRS, and a long telephone call is then made.

const TInt KPopSendInactivityTimeMinutes = 30;

const TInt KPopReceiveInactivityTimeMinutes = 30;

// Utility functions used by both active objects...

GLDEF_C TBool CommandAccepted(TDesC8& aResponse)

	{

	// +OK signifies a successful command -ERR otherwise

	return (0==aResponse.Locate('+'));

	}

//

// My own panic command 

//

GLDEF_C void Panic(TPopsPanic aPanic)

	{

	_LIT(KPanicText,"Pop3 session");

	User::Panic(KPanicText, aPanic);

	}

CImPop3Session::CImPop3Session()

	: CMsgActive(KImPopSessionPriority)

	{

	__DECLARE_NAME(_S("CImPop3Session"));

	}

CImPop3Session* CImPop3Session::NewL(RSocketServ& aServ, CImConnect& aConnect)

	{

	CImPop3Session* self = new (ELeave) CImPop3Session();

	CleanupStack::PushL(self);

	self->ConstructL(aServ, aConnect);

	CleanupStack::Pop();

	return self;

	}

void CImPop3Session::ConstructL(RSocketServ& aServ, CImConnect& aConnect)

	{

	iSocket=CImTextServerSession::NewL(KPopSendInactivityTimeMinutes, KPopReceiveInactivityTimeMinutes, aServ, aConnect);

	iNoMessages=0;

	iIdTab=NULL;

	iSocketConnected=EFalse;

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

	iSaslAuthLogin = EFalse;

#endif	

	CActiveScheduler::Add(this);	  // Add PopSession to scheduler's queue

	}

CImPop3Session::~CImPop3Session()

	{

	Cancel();

	delete iPopApop;

	delete iConnectReply;

	delete iSocket;

	delete [] iIdTab;

	delete iCaf;

	delete iPopCapabilities;

	}

//

// Connect to Pop3 with User and Pass

//

void CImPop3Session::ConnectL(CImPop3Settings* aPopSettings, const CImIAPPreferences& aPrefs, TRequestStatus& aStatus)

	{

	__ASSERT_DEBUG(!IsActive(),Panic(EImppAlreadyActive));

	// copy of pop settings owned by mtm

	iPopSettings = aPopSettings;

	iCompleted=KErrNone;

	iState=EConnectingToPop;	// Initialise to 1st state of state machine

	Queue(aStatus);

	if(iPopSettings->SSLWrapper())

		{

		iSocket->SSLQueueConnectL(iStatus, iPopSettings->ServerAddress(), aPopSettings->Port(), aPrefs, iPopSettings->TlsSslDomain());

		}

	else

		{

		iSocket->QueueConnectL(iStatus, iPopSettings->ServerAddress(), aPopSettings->Port(), aPrefs, iPopSettings->TlsSslDomain());

		}

	SetActive();

	}

//

// Queue a read if mailbox is in idle state

//

void CImPop3Session::Waiting(TRequestStatus& aStatus)

	{

	iState=EPopConnected;

	iSocket->QueueReceiveNextTextLine(iStatus);

	SetActive();

	Queue(aStatus);

	}

//

// Put a QUIT function 

//

void CImPop3Session::Quit(TRequestStatus& aStatus)

	{

	__ASSERT_DEBUG(!IsActive(),Panic(EImppAlreadyActive));

	iState=EStopPop;

	if(iSocketConnected)

		{

		_LIT8(KPop3CmdQuit, "QUIT\r\n");

		iSocket->SendQueueReceive(iStatus,KPop3CmdQuit());

		SetActive();

		Queue(aStatus);

		}

	else

		{

		TRequestStatus* pS=&iStatus;

		User::RequestComplete(pS,KErrNone);

		}

	}

//

// Pass the TMsg array to our Pop session

//

void CImPop3Session::SetMessageArray(TInt32* anIdArray, TUint aNoMessages)

	{

	iIdTab=anIdArray;

	iNoMessages=aNoMessages;

	}

TInt32* CImPop3Session::MessageArray()

	{

	return iIdTab;

	}

TInt CImPop3Session::GetNumMessages()

	{

	return iNoMessages;

	}

//

// Return Pop3 message no for a given message id

//

TInt CImPop3Session::MessageNo(TMsvId aMsgId)

// AF Using TInt reduces the available range of +ve numbers 

// but shouldn't be a problem should it?

	{

	TInt msgNo=KErrNotFound;

	TInt arrayCtr=0;

	if(iIdTab==NULL || iNoMessages==0)

		{

		Panic(EImppBabelMsgArrayNotDefined);

		}

	while(arrayCtr<iNoMessages && msgNo==KErrNotFound)

		{

		if(TInt32(*(iIdTab+arrayCtr))==aMsgId)

			{

			msgNo=arrayCtr+1;

			}

		arrayCtr++;

		}

	return msgNo;

	}

//

// Cancel any current operation

//

void CImPop3Session::DoCancel()

	{

	if(iState==EStopPop)

		{

		iSocket->Disconnect();

		iSocketConnected=EFalse;

		}

	if(iState == EPopCapabilities || iState == EWaitingForReply)

	    {

	    if(iPopCapabilities)

	        {

	        iPopCapabilities->Cancel();

	        }

	    }

	iSocket->Cancel();  // clear a pending socket call

	CMsgActive::DoCancel();

	}

//

// Result of last active call

//

void CImPop3Session::DoRunL()

    {

	if(iState==EStopPop)

		{

		iSocket->Disconnect();

		iSocketConnected=EFalse;

		}

	//get the response

	if(iState!=EConnectingToPop && iState!=EStopPop)

		{

		if(iState != EWaitingForReply)

			{

			TInt lineState=iSocket->GetCurrentTextLine(iResponseBuffer);

			__ASSERT_ALWAYS(lineState==ECRLFTerminated,User::Leave(EImppBufferNotTerminated));

			if(!CommandAccepted(iResponseBuffer))

				{

				User::Leave(GetPopError());

				}

			}

		if(iPopSettings->Apop() && iState==EWaitingForReply)

			{

			HBufC8* connectReply = HBufC8::NewL(KImMailMaxBufferSize);

			// Delete iConnectReply if not NULL & assign newly created

			delete iConnectReply;

			iConnectReply = connectReply;

			iConnectReply->Des().Copy(iResponseBuffer); 

			}

		}

	if(iState!=EStopPop) 

		{

		// successful response decide what to do next

		switch(iState)

			{

			case EPopCapabilities:

				GetCapabilitiesL();

				iState = EWaitingForReply;

				break;

			case EWaitingForReply:

				if(iPopSettings->SecureSockets())

					{

					iState = ERequestingTLS;

					}

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

				else if(iPopSettings->POP3Auth())

					{

					iState = ESaslAuthInProgress; 

					SelectAuthExtensionProfileL();

					}

#endif					

				else if(iPopSettings->Apop())

					{

					iState=EAuthorisingApop;

					}

				else 

					{

					iState++;

					}

				ChangeStateL();

				break;

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)					

			case ESaslAuthInProgress:

				// To set the server response, accodring the response will be creating 

				// the authentication string.

				iPopAuthHelper->SetLastServerMessageL(iResponseBuffer, ETrue);

				iState++;

				ChangeStateL();

				break;

			case ESaslAuthIsDone:

				iSocketConnected=ETrue;

				break;

#endif

			case EConnectingToPop:

			case EAuthorisingUser:

				iState++;

				ChangeStateL();

				break;

			case EAuthorisingPass:

			case EAuthorisingApop:

				iSocketConnected=ETrue;

				break;

			// TLS request accepted

			case ERequestingTLS:

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)			

				if(iPopSettings->POP3Auth())

					{

					iState = ESaslAuthInProgress; 

					SelectAuthExtensionProfileL();

					}

				else

#endif

					{

					iPopSettings->Apop() ? iState = EAuthorisingApop : iState =EAuthorisingUser;

					}

				ChangeStateL();

				break;

			}

		}

   }

void CImPop3Session::DoComplete(TInt& aCompleteStatus)

 	{

	TInt status=aCompleteStatus;

	if (status==KErrNone)	// no error

		{

		return;

		}

	if(iSocketConnected && status==KErrCancel)	// Cancel() has been called

		{

		return;

		}

	// if we've connected but it all goes wrong send a synchronous quit kludged code

	switch (iState)

		{

	case EWaitingForReply:	// stay connected

	case EStopPop:			

		break;

	case EAuthorisingUser:

	case EAuthorisingPass:

	case EAuthorisingApop:

	case EPopConnected:     // idle read has returned POP server timed out

	case EConnectingToPop:	// lose connection

	case ERequestingTLS:

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

	case ESaslAuthInProgress:

	case ESaslAuthIsDone:

#endif	

		iSocket->Disconnect();

		iSocketConnected=EFalse;

		break;

		}

	}

void CImPop3Session::ChangeStateL()

	{

	//

	// State machine of the POP mail session.

	// (But only handle states which can leave)

	// Identify state on entry, change to next state and then

	// start new operation associated with that new state.

	//

	__ASSERT_DEBUG(!IsActive(),Panic(EImppAlreadyActive));

	switch (iState)

		{

	case EPopCapabilities:

		iSocket->QueueReceiveNextTextLine(iStatus);

		break;

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)	

	case ESaslAuthInProgress:

		iPopAuthHelper->GetNextClientMessageL(iResponseBuffer);

		iSocket->SendQueueReceive(iStatus, iResponseBuffer);

		iSocket->PerformLogging(ETrue);

		break;

	case ESaslAuthIsDone:

		iPopAuthHelper->GetNextClientMessageL(iResponseBuffer);

		iSocket->SendQueueReceive(iStatus, iResponseBuffer);

		iSocket->PerformLogging(ETrue);

		if(iSaslAuthLogin)

			{

			iState = ESaslAuthInProgress;

			iSaslAuthLogin = EFalse;	

			}

		break;

#endif

	case EAuthorisingUser:

	case EAuthorisingApop:

		{

		TPtrC8 loginName=iPopSettings->LoginName();

		if (iState == EAuthorisingApop)

			{

			TRAPD(apopErr,ConstructApopL());

			if(apopErr!=KErrNone)

				{

				User::Leave(KPop3CannotCreateApopLogonString);

				}

			iSocket->PerformLogging(EFalse);

			_LIT8(KPop3CmdApop, "APOP %S %S\r\n");

			iSocket->SendQueueReceive(iStatus, KPop3CmdApop(), &loginName, iPopApop);

			iSocket->PerformLogging(ETrue);

			delete iPopApop;

			iPopApop=NULL;

			delete iConnectReply;

			iConnectReply=NULL;

			}

		else

			{

			iSocket->PerformLogging(EFalse);

			_LIT8(KPop3CmdUser, "USER %S\r\n");

			iSocket->SendQueueReceive(iStatus, KPop3CmdUser(), &loginName);

			iSocket->PerformLogging(ETrue);

			}

		break;

		}

	case EAuthorisingPass:

		{

		TPtrC8 password=iPopSettings->Password();

		iSocket->PerformLogging(EFalse);

		_LIT8(KPop3CmdPass, "PASS %S\r\n");

		iSocket->SendQueueReceive(iStatus, KPop3CmdPass(), &password);

		iSocket->PerformLogging(ETrue);

		break;

		}   

	// new request to initiate TLS

	case ERequestingTLS:

		_LIT8(KPop3CmdOk, "+OK");

		iSocket->SetSSLTLSResponseL(KPop3CmdOk());

		_LIT8(KPop3CmdStls, "STLS\r\n");

		iSocket->SendQueueReceive(iStatus, KPop3CmdStls());

		break;

	   default: 	// Unknown state

		   Panic(EImppBadSessionState);

		   break;

		}

	SetActive();

	}

//

// return a pointer to our CImTextServerSession so CPop3Operations can use it

//

 CImTextServerSession* CImPop3Session::TextServerSession()

	{

	return iSocket;

	}

//

// Return POP3 error (based on what state the POP login is in

//

TInt CImPop3Session::GetPopError()

	{

	TInt anError=KErrGeneral;

	switch (iState)

		{

	case EWaitingForReply:

	case EPopCapabilities:

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

		if(iPopSettings->POP3Auth() && iState != EPopCapabilities)

			{

			anError=KPop3AuthenticationFailed;

			}

		else

#endif		

			{

			anError=KPop3CannotConnect;

			} 

		break;

	case EAuthorisingUser:

		anError=KPop3InvalidUser;

		break;

	case EAuthorisingPass:

		anError=KPop3InvalidLogin;

		break;

#if (defined SYMBIAN_EMAIL_CAPABILITY_SUPPORT)

	case ESaslAuthInProgress:

		anError=KPop3InvalidUser;

		break;

	case ESaslAuthIsDone:

		anError=KPop3InvalidLogin;

		break;

#endif		

	case EAuthorisingApop:

		anError=KPop3InvalidApopLogin;

		break;

	case EPopConnected:

		anError=KErrDisconnected; // assume that this is Pop time out

		break;

	case ERequestingTLS:

		anError = KErrPop3TLSNegotiateFailed;

	default:

		break;

		}

	return anError;

	}

//DMC

TInt CImPop3Session::MaxHeaders() 

	{

	return iPopSettings->InboxSynchronisationLimit();

	}

//

// Set and test state of iOpPending: is a pop operation currently underway?

//