/*

* Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB

*

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:

* EmbedDev AB - initial contribution.

*

* Contributors:

*

* Description:

*

*/

// HttpEventHandler.cpp

#include <e32debug.h>

#include <httperr.h>

#include <sysutil.h>

#include "HttpEventHandler.h"

#include "bautils.h"

#include "Httpclient.h"

#include "Podcatcher.pan"

const TInt64 KMinDiskSpace = 1024 * 1024; // at least 1 MB must remain

void CHttpEventHandler::ConstructL()

	{

	//iVerbose = ETrue;	

	}

CHttpEventHandler::CHttpEventHandler(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs): 

	iFileServ(aFs), iHttpClient(aClient), iCallbacks(aCallbacks)

	{

	}

CHttpEventHandler::~CHttpEventHandler()

	{	

	}

CHttpEventHandler* CHttpEventHandler::NewLC(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs)

	{

	CHttpEventHandler* me = new(ELeave)CHttpEventHandler(aClient, aCallbacks, aFs);

	CleanupStack::PushL(me);

	me->ConstructL();

	return me;

	}

CHttpEventHandler* CHttpEventHandler::NewL(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs)

	{

	CHttpEventHandler* me = NewLC(aClient, aCallbacks, aFs);

	CleanupStack::Pop(me);

	return me;

	}

void CHttpEventHandler::MHFRunL(RHTTPTransaction aTransaction, const THTTPEvent& aEvent)

	{

	//DP1("CHttpEventHandler::MHFRunL, aEvent.iStatus=%d", aEvent.iStatus);

	switch (aEvent.iStatus)

		{

		case THTTPEvent::EGotResponseHeaders:

			{

			// HTTP response headers have been received. We can determine now if there is

			// going to be a response body to save.

			RHTTPResponse resp = aTransaction.Response();

			iLastStatusCode = resp.StatusCode();

			DP1("Status: %d", iLastStatusCode);

			// Dump the headers if we're being verbose

			//DumpRespHeadersL(aTransaction);

			if (resp.HasBody() && (iLastStatusCode >= 200) && (iLastStatusCode < 300) && (iLastStatusCode != 204))

				{

				TInt dataSize = resp.Body()->OverallDataSize();

				if (dataSize >= 0) {

					DP1("Response body size is %d", dataSize);

					iBytesTotal = dataSize;	

				} else {

					DP("Response body size is unknown");

					iBytesTotal = -1;

				}

				iCallbacks.DownloadInfo(iHttpClient, dataSize);

				}

			DP1("iFileOpen=%d", iFileOpen);

			if (!iFileOpen)

				{

				iFileServ.Parse(iFileName, iParsedFileName);

				TInt valid = iFileServ.IsValidName(iFileName);

				if (!valid)

					{

					DP("The specified filename is not valid!.");

					iHttpClient->ClientRequestCompleteL(KErrBadName);

					}

				else

					{

					if (iContinue) {

						TInt err = iRespBodyFile.Open(iFileServ, iParsedFileName.FullName(),EFileWrite);

						if (err)

							{

							DP2("There was an error=%d opening file '%S'", err, &iParsedFileName.FullName());

							iHttpClient->ClientRequestCompleteL(KErrInUse);

							User::Leave(err);

							} 

						else

							{

							iFileOpen = ETrue;

							int pos = -KByteOverlap;

							if((err=iRespBodyFile.Seek(ESeekEnd, pos)) != KErrNone)

								{

								DP("Failed to set position!");

								iHttpClient->ClientRequestCompleteL(KErrWrite);

								User::Leave(err);

								}

							iBytesDownloaded = (pos > 0) ? pos : 0;

							iBytesTotal += iBytesDownloaded;

							DP1("Total bytes is now %u", iBytesTotal);

							DP1("Seeking end: %d", pos);

							}

						}

					else 

						{

						TInt err = iRespBodyFile.Replace(iFileServ,

														 iParsedFileName.FullName(),

														 EFileWrite);

						if (err)

							{

							DP("There was an error replacing file");

							User::Leave(err);

							}

						else

							{

							iFileOpen = ETrue;

							}

						}

					}

				}

			} break;

		case THTTPEvent::EGotResponseBodyData:

			{

			// Get the body data supplier

			iRespBody = aTransaction.Response().Body();

			// Some (more) body data has been received (in the HTTP response)

			//DumpRespBody(aTransaction);

			//DP1("Saving: %d", iSavingResponseBody);

			// check if we have enough disk space

			if (iDriveNo != -1 && SysUtil::DiskSpaceBelowCriticalLevelL( &iFileServ, KMinDiskSpace, iDriveNo ))

				{

					TInt error = KErrDiskFull;

					iFileOpen = EFalse;

					iRespBodyFile.Close();

					iCallbacks.FileError(error);

					iHttpClient->ClientRequestCompleteL(error);

					return;

				}

			// Append to the output file if we're saving responses

			if (iFileOpen)

				{

				TPtrC8 bodyData;

				iRespBody->GetNextDataPart(bodyData);

				iBytesDownloaded += bodyData.Length();

				TInt error = iRespBodyFile.Write(bodyData);

				// on writing error we close connection 

				if (error != KErrNone) {

					iFileOpen = EFalse;

					iRespBodyFile.Close();

					iCallbacks.FileError(error);

					iHttpClient->ClientRequestCompleteL(error);

					return;

				}

				if (!iSilent) {

					iCallbacks.Progress(iHttpClient, iBytesDownloaded, iBytesTotal);

				}

				}

			// Done with that bit of body data

			iRespBody->ReleaseData();

			} break;

		case THTTPEvent::EResponseComplete:

			{

			// The transaction's response is complete

			DP("Transaction Complete");

			DP("Closing file");

			iFileOpen = EFalse;

			iRespBodyFile.Close();

			} break;

		case THTTPEvent::ESucceeded:

			{

			DP("Transaction Successful");

			iFileOpen = EFalse;

			iRespBodyFile.Close();

			aTransaction.Close();

			iHttpClient->ClientRequestCompleteL(KErrNone);

			} break;

		case THTTPEvent::EFailed:

			{

			DP("Transaction Failed");

			iFileOpen = EFalse;

			iRespBodyFile.Close();

			aTransaction.Close();

			if(iLastStatusCode == HTTPStatus::EOk || iLastStatusCode == HTTPStatus::ECreated || iLastStatusCode == HTTPStatus::EAccepted)

				{

				iLastStatusCode = KErrNone;

				}

			iHttpClient->ClientRequestCompleteL(iLastStatusCode);

			} break;

		case THTTPEvent::ERedirectedPermanently:

			{

			DP("Permanent Redirection");

			} break;

		case THTTPEvent::ERedirectedTemporarily:

			{

			DP("Temporary Redirection");

			} break;

		default:

			{

			DP1("<unrecognised event: %d>", aEvent.iStatus);

			// close off the transaction if it's an error

			if (aEvent.iStatus < 0)

				{

				iFileOpen = EFalse;

				iRespBodyFile.Close();

				aTransaction.Close();

				iHttpClient->ClientRequestCompleteL(aEvent.iStatus);

				}

			} break;

		}

	}

TInt CHttpEventHandler::MHFRunError(TInt aError, RHTTPTransaction aTransaction, const THTTPEvent& /*aEvent*/)

	{

	DP1("MHFRunError fired with error code %d", aError);

	aTransaction.Close();

	TRAP_IGNORE(iHttpClient->ClientRequestCompleteL(aError));

	return KErrNone;

	}

void CHttpEventHandler::SetSaveFileName(const TDesC &fName, TBool aContinue)

	{

	DP1("CHttpEventHandler::SetSaveFileName, aContinue=%d", aContinue);

	iFileName.Copy(fName);

	iContinue = aContinue;

	switch(fName[0])

		{

		case 'C':

		case '\\':

			iDriveNo = EDriveC;

			break;

		case 'E':

			iDriveNo = EDriveE;

			break;

		case 'F':

			iDriveNo = EDriveF;

			break;

		case 'G':

			iDriveNo = EDriveG;

			break;

		default:

			Panic(EPodcatcherDownloadDrive);

			break;

		}

	DP1("iDriveNo set to %d", iDriveNo);

	}

void CHttpEventHandler::DumpRespHeadersL(RHTTPTransaction& aTrans)

	{

	RHTTPResponse resp = aTrans.Response();

	RStringPool strP = aTrans.Session().StringPool();

	RHTTPHeaders hdr = resp.GetHeaderCollection();

	THTTPHdrFieldIter it = hdr.Fields();

	TBuf<KMaxHeaderNameLen>  fieldName16;

	TBuf<KMaxHeaderValueLen> fieldVal16;

	while (it.AtEnd() == EFalse)

		{

		RStringTokenF fieldName = it();

		RStringF fieldNameStr = strP.StringF(fieldName);

		THTTPHdrVal fieldVal;

		if (hdr.GetField(fieldNameStr,0,fieldVal) == KErrNone)

			{

			const TDesC8& fieldNameDesC = fieldNameStr.DesC();

			fieldName16.Copy(fieldNameDesC.Left(KMaxHeaderNameLen));

			switch (fieldVal.Type())

				{

			case THTTPHdrVal::KTIntVal:

				DP2("%S: %d", &fieldName16, fieldVal.Int());

				break;

			case THTTPHdrVal::KStrFVal:

				{

				RStringF fieldValStr = strP.StringF(fieldVal.StrF());

				const TDesC8& fieldValDesC = fieldValStr.DesC();

				fieldVal16.Copy(fieldValDesC.Left(KMaxHeaderValueLen));

				DP2("%S: %S", &fieldName16, &fieldVal16);

				}

				break;

			case THTTPHdrVal::KStrVal:

				{

				RString fieldValStr = strP.String(fieldVal.Str());

				const TDesC8& fieldValDesC = fieldValStr.DesC();

				fieldVal16.Copy(fieldValDesC.Left(KMaxHeaderValueLen));

				DP2("%S: %S", &fieldName16, &fieldVal16);

				}

				break;

			case THTTPHdrVal::KDateVal:

				{

				TDateTime date = fieldVal.DateTime();

				} 

				break;

			default:

				DP1("%S: <unrecognised value type>", &fieldName16);

				break;

				}

			// Display realm for WWW-Authenticate header

			RStringF wwwAuth = strP.StringF(HTTP::EWWWAuthenticate,RHTTPSession::GetTable());

			if (fieldNameStr == wwwAuth)

				{

				// check the auth scheme is 'basic'

				RStringF basic = strP.StringF(HTTP::EBasic,RHTTPSession::GetTable());

				RStringF realm = strP.StringF(HTTP::ERealm,RHTTPSession::GetTable());

				THTTPHdrVal realmVal;

				if ((fieldVal.StrF() == basic) && 

					(!hdr.GetParam(wwwAuth, realm, realmVal)))

					{

					RStringF realmValStr = strP.StringF(realmVal.StrF());

					fieldVal16.Copy(realmValStr.DesC());

					DP1("Realm is: %S", &fieldVal16);

					}

				}

			}

		++it;

		}

	}

void CHttpEventHandler::DumpRespBody(RHTTPTransaction& aTrans)

	{

	MHTTPDataSupplier* body = aTrans.Response().Body();

	TPtrC8 dataChunk;

	TBool isLast = body->GetNextDataPart(dataChunk);

	DumpIt(dataChunk);

	if (isLast)

		DP("Got last data chunk.");

	}

void CHttpEventHandler::DumpIt(const TDesC8& aData)

//Do a formatted dump of binary data

	{

	// Iterate the supplied block of data in blocks of cols=80 bytes

	const TInt cols=16;

	TInt pos = 0;

	TBuf<KMaxFileName - 2> logLine;

	TBuf<KMaxFileName - 2> anEntry;

	const TInt dataLength = aData.Length();

	while (pos < dataLength)

		{

		//start-line hexadecimal( a 4 digit number)

		anEntry.Format(TRefByValue<const TDesC>_L("%04x : "), pos);

		logLine.Append(anEntry);

		// Hex output

		TInt offset;

		for (offset = 0; offset < cols; ++offset)

			{

			if (pos + offset < aData.Length())

				{

				TInt nextByte = aData[pos + offset];

				anEntry.Format(TRefByValue<const TDesC>_L("%02x "), nextByte);

				logLine.Append(anEntry);

				}

			else

				{

				//fill the remaining spaces with blanks untill the cols-th Hex number 

				anEntry.Format(TRefByValue<const TDesC>_L("   "));

				logLine.Append(anEntry);

				}

			}

			anEntry.Format(TRefByValue<const TDesC>_L(": "));

			logLine.Append(anEntry);

		// Char output

		for (offset = 0; offset < cols; ++offset)

			{

			if (pos + offset < aData.Length())

				{

				TInt nextByte = aData[pos + offset];

				if ((nextByte >= ' ') && (nextByte <= '~'))

					{

					anEntry.Format(TRefByValue<const TDesC>_L("%c"), nextByte);

					logLine.Append(anEntry);

					}

				else

					{

					anEntry.Format(TRefByValue<const TDesC>_L("."));

					logLine.Append(anEntry);

					}

				}

			else

				{

				anEntry.Format(TRefByValue<const TDesC>_L(" "));

				logLine.Append(anEntry);

				}

			}

			logLine.Zero();

		// Advance to next  byte segment (1 seg= cols)

		pos += cols;

		}

	}

void CHttpEventHandler::SetSilent(TBool aSilent)

	{

	iSilent = aSilent;

	}

void CHttpEventHandler::CloseSaveFile()

{

	DP("CHttpEventHandler::CloseSaveFile BEGIN");

	if(iRespBody != NULL)

	{		

		if(iRespBodyFile.SubSessionHandle() != 0)

			{

			TInt size;

			iRespBodyFile.Size(size);

			DP2("Closing file at size %d, bytes downloaded %d", size, iBytesDownloaded);

			iRespBodyFile.Close();

			}

	}

	DP("CHttpEventHandler::CloseSaveFile BEGIN");

}