/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* 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:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  A class that fetches resources via HTTP 1.1.

*

*/

#include <EscapeUtils.h>

#include <http.h>

#include <http/mhttpdatasupplier.h>

#include <httpfiltercommonstringsaddition.h>

#include "HttpConnection.h"

#include "HttpHandler.h"

#include <leaktracker.h>

#include "Logger.h"

#include <cuseragent.h>

// -----------------------------------------------------------------------------

// CHttpHandler::NewL

//

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

CHttpHandler* CHttpHandler::NewL(CHttpConnection& aHttpConnection)

    {

    CHttpHandler* self = new (ELeave) CHttpHandler(aHttpConnection);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop();

    return self;

    }

// -----------------------------------------------------------------------------

// CHttpHandler::CHttpHandler

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CHttpHandler::CHttpHandler(CHttpConnection& aHttpConnection):

        KTimerPeriod(40000000), iLeakTracker(CLeakTracker::EHttpHandler),

        iHttpConnection(&aHttpConnection), 

        iSession(aHttpConnection.Session()), iLastActivity(0), iStatusCode(KErrNone)

    {

    iTimerState.iFunction = TimerCallback;

    iTimerState.iPtr = static_cast<TAny*>(this);

    }

// -----------------------------------------------------------------------------

// CHttpHandler::ConstructL

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

void CHttpHandler::ConstructL()

    {

    // Get the http connection.

    if (!iHttpConnection->IsConnected())

        {

        // Set this instance as the connection observer.

        // TODO: In 3.1 when multiple tasks are supported this needs to be

        //      changed to AddObserver as multiple tasks may need to be waken.

        iHttpConnection->SetObserver(this);

        iIsConnectionObserver = ETrue;

        }

    iTimer = CPeriodic::NewL(EPriorityHigh);

    iStringPool = iSession.StringPool();

    }        

// -----------------------------------------------------------------------------

// CHttpHandler::~CHttpHandler

// Deconstructor.

// -----------------------------------------------------------------------------

//

CHttpHandler::~CHttpHandler()

    {

    // If this happened to be the instances that is observing the connection 

    // then clear the connection's observer...

    if (iIsConnectionObserver)

        {

	        if(iHttpConnection)

	        {

	        	iHttpConnection->SetObserver(NULL);	

	        }

        }

	RHTTPTransaction temp;

	if (iTransaction != temp)

	{

		// Close the transaction.

	    iTransaction.Close();	

	}

    delete iResponseBuffer;    

    delete iTimer;

    }

// -----------------------------------------------------------------------------

// CHttpHandler::LoadUrl

// 

// Loads the given url -- asynchronously

// -----------------------------------------------------------------------------

//

void CHttpHandler::LoadUrlL(const TDesC& aUrl, MLoadObserver& aObserver)

    {

    TUriParser8  uriParser;

    HBufC8*      url;

    // Set the observer.

    iObserver = &aObserver;

    // Parse the url.

    url = HBufC8::NewLC(aUrl.Length());

    url->Des().Copy(aUrl);

    User::LeaveIfError(uriParser.Parse(*url));

    // Create the transaction.

    iTransaction = iSession.OpenTransactionL(uriParser, *this,

        iSession.StringPool().StringF(HTTP::EGET, RHTTPSession::GetTable()));

    // TODO: Set the headers if any.

    //++PK Add UA header code

    iUserAgentHeader = iTransaction.Request().GetHeaderCollection();

    CUserAgent* tWebUtilsStandardUA = CUserAgent::NewL();

    CleanupStack::PushL(tWebUtilsStandardUA);

    HBufC8* tWebUtilsStandardUAHeaderValue = tWebUtilsStandardUA->UserAgentL();

    CleanupStack::PushL(tWebUtilsStandardUAHeaderValue);

    RStringF tStringValue = iSession.StringPool().OpenFStringL(*tWebUtilsStandardUAHeaderValue);

    THTTPHdrVal tHeaderValue( tStringValue );

    RStringF tStringUA = iSession.StringPool().StringF(HTTP::EUserAgent, RHTTPSession::GetTable());

    iUserAgentHeader.SetFieldL( tStringUA, tStringValue );

    //++PK

    // Submit the request.

    iTransaction.SubmitL();

    // If the connection is available it is safe to tell to the observer

    // to display progress indicators (i.e. a wait-dialog).

    if (iHttpConnection->IsConnected())

        {

        iObserver->StartWait();

        // Start the inactive connection timer as well.

        iTimer->Start(KTimerPeriod, KTimerPeriod, iTimerState);

        iLastActivity.HomeTime();

        }

    tStringValue.Close();

    CleanupStack::PopAndDestroy(tWebUtilsStandardUAHeaderValue);

    CleanupStack::PopAndDestroy(tWebUtilsStandardUA);

    CleanupStack::PopAndDestroy(url);

    }

// -----------------------------------------------------------------------------

// CHttpHandler::ConnectionAvailable

// 

// Notifies the observer that the connection is available.

// -----------------------------------------------------------------------------

//

void CHttpHandler::ConnectionAvailable()

    {

    // Now that the connection is available it is safe to tell to the observer

    // to display progress indicators (i.e. a wait-dialog).

    iObserver->StartWait();

    // Start the inactive connection timer.

    iTimer->Start(KTimerPeriod, KTimerPeriod, iTimerState);

    iLastActivity.HomeTime();

    }

// -----------------------------------------------------------------------------

// CHttpHandler::ConnectionFailed

// 

// Notifies the observer that the establishment of the connection failed.

// -----------------------------------------------------------------------------

//

void CHttpHandler::ConnectionFailed(TInt aStatus)

    {

    // Cancel the transaction.

    iTransaction.Cancel();

		aStatus = -aStatus;

    // Notify the observer.

    LoadCompleted(aStatus, NULL, KNullDesC, KNullDesC);  

    }

// -----------------------------------------------------------------------------

// CHttpHandler::MHFRunL

// 

// Called when the filter's registration conditions are satisfied for events that

// occur on a transaction.

// -----------------------------------------------------------------------------

//

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

	{

    // Some kind of connection activity occurred so update iLastActivity.

    iLastActivity.HomeTime();

	switch (aEvent.iStatus)

		{

		case THTTPEvent::EGotResponseHeaders:

			{

			RHTTPResponse  resp = aTransaction.Response();

            // Get the headers

            iRespHeaders = resp.GetHeaderCollection();

			}

			break;

		case THTTPEvent::EGotResponseBodyData:

			{

			MHTTPDataSupplier*  dataSupplier;

			TPtrC8              ptr;

			// Get the data.

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

			dataSupplier->GetNextDataPart(ptr);

            CleanupStack::PushL(TCleanupItem(&CleanupDataSupplier, dataSupplier));

			// Append to iResponseBuffer

			if (iResponseBuffer == NULL)

				{

				iResponseBuffer = ptr.AllocL();

				}

			else

				{

				iResponseBuffer = iResponseBuffer->ReAllocL(iResponseBuffer->Length() + ptr.Length());

				iResponseBuffer->Des().Append(ptr);

				}

			// Release the body data.

            CleanupStack::PopAndDestroy(/*dataSupplier*/);

			}

			break;

		case THTTPEvent::ESucceeded:

			{

			TDesC*   contentType = NULL;

            TDesC*   charSet = NULL;

            // Get the content-type and char-set.

            GetContentTypeL(contentType, charSet);

            // Pass the buffer to the observer.

			LoadCompleted(KErrNone, iResponseBuffer, *contentType, *charSet);

            iResponseBuffer = NULL;

            delete contentType;

            contentType = NULL;

            delete charSet;

            charSet = NULL;

			}

			break;

        case THTTPEvent::EFailed:

        case THTTPEvent::EUnrecoverableError:

        	{

        	// Notify the observer.

        	RHTTPResponse  resp = aTransaction.Response();

        	TInt statusCode = resp.StatusCode();

        	if(iStatusCode == KErrNone)

        		{

        		iStatusCode = (statusCode + 20000); // Web server HTTP status code are lesser than -20000

        		}

        	if(iStatusCode == -(KErrNoMemory)) //KErrNoMemory is not HTTP error so it should be -ve

        		{

        		iStatusCode = KErrNoMemory;

        		}

            LoadCompleted( iStatusCode, NULL, KNullDesC, KNullDesC );  

            // Clean up the response buffer.

            delete iResponseBuffer;

            iResponseBuffer = NULL;

        	}

            break;

        default:

            FEED_LOG1(_L("Feeds"), _L("Feeds_Errors.log"), 

                    EFileLoggingModeAppend, _L("CHttpHandler::MHFRunL - Failure: default %d."), aEvent.iStatus);

            if(aEvent.iStatus < KErrNone)

            	{

            	// HTTP errors should always be +ve

            	iStatusCode = -(aEvent.iStatus); 

            	}

			break;

		}

	}

// -----------------------------------------------------------------------------

// CHttpHandler::MHFRunError

// 

// Called when RunL leaves from a transaction event. This works in the same

// way as CActve::RunError; return KErrNone if you have handled the error.

// -----------------------------------------------------------------------------

//

TInt CHttpHandler::MHFRunError(TInt aError, RHTTPTransaction /*aTransaction*/, 

        const THTTPEvent& /*aEvent*/)

	{

    FEED_LOG1(_L("Feeds"), _L("Feeds_Errors.log"), 

            EFileLoggingModeAppend, _L("CHttpHandler::MHFRunError: %d."), aError);

    // Notify the observer.

	LoadCompleted(aError, NULL, KNullDesC, KNullDesC);

    // Clean up the response buffer.

    delete iResponseBuffer;

    iResponseBuffer = NULL;

    return KErrNone;

	}

// -----------------------------------------------------------------------------

// CHttpHandler::CleanupDataSupplier

// 

// Cleanup stack callback method to release a DataSupplier.

// -----------------------------------------------------------------------------

//

void CHttpHandler::CleanupDataSupplier(TAny *aPtr)

    {

    MHTTPDataSupplier*  supplier = static_cast<MHTTPDataSupplier*>(aPtr);

    // Release it

	supplier->ReleaseData();

    }

// -----------------------------------------------------------------------------

// CHttpHandler::GetContentTypeL

// 

// Get the content-type and char-encoding from the response header.

// -----------------------------------------------------------------------------

//

void CHttpHandler::GetContentTypeL(TDesC*& aContentType, TDesC*& aCharSet)

    {

    RStringF     fieldName;

    RStringF     fieldParam;

    THTTPHdrVal  value;

    // Get the content-type.

    fieldName = iStringPool.StringF(HTTP::EContentType, RHTTPSession::GetTable());

    if (iRespHeaders.GetField(fieldName, 0, value) == KErrNone)

        {

        aContentType = EscapeUtils::ConvertToUnicodeFromUtf8L(value.StrF().DesC());

        CleanupStack::PushL(aContentType);

        }

    // Get the char-encoding.

    fieldParam = iStringPool.StringF(HTTP::ECharset, RHTTPSession::GetTable());

    if (iRespHeaders.GetParam(fieldName, fieldParam, value) == KErrNone)

        {

        aCharSet = EscapeUtils::ConvertToUnicodeFromUtf8L(value.StrF().DesC());

        CleanupStack::PushL(aCharSet);

        }

    if (aContentType == NULL)

        {

        aContentType = KNullDesC().AllocL();

        CleanupStack::PushL(aContentType);

        }

    if (aCharSet == NULL)

        {

        aCharSet = KNullDesC().AllocL();

        CleanupStack::PushL(aCharSet);

        }

    CleanupStack::Pop(2);

    }

// -----------------------------------------------------------------------------

// CHttpHandler::LoadComplete

// 

// Passes the status code and responseBody to the observer.  The observer

// adopts aResponseBody.

// -----------------------------------------------------------------------------

//

void CHttpHandler::LoadCompleted(TInt aStatusCode, TDesC8* aResponseBody,

        const TDesC& aContentType, const TDesC& aCharSet)

    {

    delete iTimer;

    iTimer = NULL;

    RHTTPTransaction temp;

    if (iTransaction != temp)

        {

		    // Close the transaction.

        iTransaction.Close();	

        }

    if (iIsConnectionObserver)

        {

        if(iHttpConnection)

            {

       	    iHttpConnection->SetObserver(NULL);	

            }

        iIsConnectionObserver = EFalse;

        }

    // Pass the buffer to the observer.

    iObserver->LoadCompleted(aStatusCode, aResponseBody, aContentType, aCharSet);

    if (aStatusCode != KErrNone)

        {

        FEED_LOG1(_L("Feeds"), _L("Feeds_Errors.log"), 

                EFileLoggingModeAppend, _L("CHttpHandler::LoadCompleted: %d."), aStatusCode);

        }

    }

// -----------------------------------------------------------------------------

// CHttpHandler::TimerCallback

// 

// The timer's callback used to abort connections that stop responding.

// -----------------------------------------------------------------------------

//

TInt CHttpHandler::TimerCallback(TAny* aPtr)

    {

    CHttpHandler*  self = static_cast<CHttpHandler*>(aPtr);

    TTime          now;

    // Get the current time.

    now.HomeTime();

    // If the connection is inactive then delete the timer and cancel the load.

    if ((self->iLastActivity + self->KTimerPeriod) < now)

        {

        delete self->iTimer;

        self->iTimer = NULL;

        FEED_LOG(_L("Feeds"), _L("Feeds_Errors.log"), 

                EFileLoggingModeAppend, _L("CHttpHandler::TimerCallback. TIMEDOUT"));

        // Cancel the transaction.

        self->iTransaction.Cancel();

        // Notify the observer.

        self->LoadCompleted(KErrTimedOut, NULL, KNullDesC, KNullDesC);  

        }

    return KErrNone;

    }