// Copyright (c) 2002-2009 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 "chttpgeneralheaderwriter.h"

#include <http/rhttpsession.h>

#include <httpstringconstants.h>

#include <httperr.h>

#include "CHeaderField.h"

_LIT8(KSemiSpaceSep,"; ");

CHttpGeneralHeaderWriter* CHttpGeneralHeaderWriter::NewL(RStringPool aStringPool)

/** 

	Factory constructor.

	@internalComponent

	@param		aStringPool	The current string pool.

	@return		A pointer to a fully initialised object.

	@leave		KErrNoMemory	Not enough memory to create object.

*/

	{

	return new(ELeave)CHttpGeneralHeaderWriter(aStringPool);

	}

CHttpGeneralHeaderWriter::~CHttpGeneralHeaderWriter()

/**

	Destructor

	@internalComponent

*/

	{

	}

CHttpGeneralHeaderWriter::CHttpGeneralHeaderWriter(RStringPool aStringPool)

: CHttpHeaderWriter(aStringPool)

/**

	Constructor

	@internalComponent

	@param		aStringPool	The current string pool.

*/

	{

	}

void CHttpGeneralHeaderWriter::EncodeCacheControlL(RHeaderField& aHeader) const

/**

	Encodes a Cache-Control header. RFC 2616 section 14.9 - 

		Cache-Control			=	"Cache-Control" ":" 1#cache-directive

		cache-directive			=	cache-request-directive 

								|	cache-response-directive

		cache-request-directive	=	"no-cache" 

								|	"no-store" 

								|	"max-age" "=" delta-seconds

								|	"max-stale" [ "=" delta-seconds ] 

								|	"min-fresh" "=" delta-seconds 

								|	"no-transform" 

								|	"only-if-cached" 

								|	cache-extension

		cache-response-directive=	"public" 

								|	"private" [ "=" <"> 1#field-name <"> ] 

								|	"no-cache" [ "=" <"> 1#field-name <"> ]

								|	"no-store" 

								|	"no-transform"

								|	"must-revalidate"

								|	"proxy-revalidate"

								|	"max-age" "=" delta-seconds

								|	"s-maxage" "=" delta-seconds

								|	cache-extension

		cache-extension			=	token [ "=" ( token | quoted-string ) ]

	The cache-control header value is a comma separated list of values with at

	least one value.

	@internalComponent

	@param		aHeader	The cache-control header field to encode.

	@leave		CHttpWriter::DoTokenCsvListHeaderL

	@todo		Is there any point in this? Why not call DoTokenCsvListHeaderL()

				directly

*/

	{

	DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeCacheControl);

	}

void CHttpGeneralHeaderWriter::EncodeConnectionL(RHeaderField& aHeader) const

/**

	Decodes the Connection header. RFC2616 section 14.10 - 

		Connection = "Connection" ":" 1#(connection-token)

		connection-token  = token

	The connection header value is a comma separated list of values with at least

	one value.

	@internalComponent

	@param		aHeader	The connection header field to encode.

	@leave		CHttpWriter::DoTokenCsvListHeaderL

	@todo		Is there any point in this? Why not call DoTokenCsvListHeaderL()

				directly

*/

	{

	DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeConnection);

	}

void CHttpGeneralHeaderWriter::EncodeDateL(RHeaderField& aHeader) const

/**

	Encodes the date header. RFC2616 section 14.18 - 

		Date		=	"Date" ":" HTTP-Date

	The HTTP-Date format has a few formats. E.g. Date: Tue, 15 Nov 1994 08:12:31 GMT

	@internalComponent

	@param		aHeader	The date header field to encode.

	@leave		CHttpWriter::EncodeGenericDateL

	@todo		Is there any point in this? Why not call EncodeGenericDateL()

				directly

*/

	{

	EncodeGenericDateL(aHeader, KErrHttpEncodeDate);

	}

void CHttpGeneralHeaderWriter::EncodeTransferEncodingL(RHeaderField& aHeader) const

/**

	Encodes the transfer-encoding header. RFC2616 section 14.41 -

		Transfer-Encoding       =	"Transfer-Encoding" ":" 1#transfer-coding

		transfer-coding         =	"chunked" | transfer-extension

		transfer-extension      =	token *( ";" parameter )

		parameter               =	attribute "=" value

		attribute               =	token

		value                   =	token | quoted-string

	The transfer-encoding header is a comma separated list of values with at 

	least one value.

	@internalComponent

	@param		aHeader	The transfer-encoding header field to encode.

	@leave		CHttpWriter::DoTokenCsvListHeaderL

	@todo		Is there any point in this? Why not call DoTokenCsvListHeaderL()

				directly

*/

	{

	DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeTransferEncoding);

	}

void CHttpGeneralHeaderWriter::EncodeContentTypeL(RHeaderField& aHeader) const

/**

	Encodes the content-type header. RFC2616 section 14.17

		Content-Type			=	"Content-Type" ":" media-type

		media-type				=	type "/" subtype *( ";" parameter )

		type					=	token

		subtype					=	token

		parameter				=	attribute '=' value

		attribute               =	token

		value                   =	token | quoted-string

	The content-type header has a single media-type value. The atttribute 

	is normally the 'charset'. E.g. Content-Type: text/html; charset=ISO-8859-4

	@internalComponent

	@param		aHeader	The content-type header field to encode.

	@leave		RHeaderField::BeginRawDataL

	@leave		RHeaderField::WriteRawDataL

	@leave		CHttpWriter::WriteRawStrFPartL

	@leave		KErrHttpEncodeContentType	There are no value tokens, the

											parameter was empty or the parameter

											was not a string type value.

*/

	{

  __START_PERFORMANCE_LOGGER();

	// Check part 1

	THeaderFieldPartIter iter = aHeader.PartsL();

	iter.First();

	if( iter.AtEnd() )

		{

		// The header value is empty!

		User::Leave(KErrHttpEncodeContentType);

		}

	aHeader.BeginRawDataL();

	const CHeaderFieldPart* part = WriteRawStrFPartL(aHeader, iter, KErrHttpEncodeContentType);

	// Check for parameters...

	THeaderFieldParamIter iter2 = part->Parameters();

	iter2.First();

	while( !iter2.AtEnd() )

		{

		// Got a parameter - write a semicolon separator

		aHeader.WriteRawDataL(KSemiSpaceSep);

		const CHeaderFieldParam* param = iter2();

		if( !param )

			{

			// Empty parameter!

			User::Leave(KErrHttpEncodeContentType);

			}

		// Anticipate only string parameter values

		THTTPHdrVal paramVal = param->Value();

		if( paramVal.Type() != THTTPHdrVal::KStrFVal )

			{

			// Was not a string value...

			User::Leave(KErrHttpEncodeContentType);

			}

		RStringF paramName = iStringPool.StringF(param->Name());

		aHeader.WriteRawDataL(paramName.DesC());

		aHeader.WriteRawDataL('=');

		aHeader.WriteRawDataL(paramVal.StrF().DesC());

		// Move onto the next parameter, writing a separator as necessary

		++iter2;

		}

	// All done!

	aHeader.CommitRawData();

	__END_PERFORMANCE_LOGGER(_L(",CHttpGeneralHeaderWriter::EncodeContentTypeL()"));

	}

void CHttpGeneralHeaderWriter::EncodeContentLengthL(RHeaderField& aHeader) const

/**

	Encodes the content-length header. RFC2616 section 14.13 - 

		Content-Length    = "Content-Length" ":" 1*DIGIT

	The content-length value is a number with at least one digit.

	@internalComponent

	@param		aHeader	The content-length header field to encode.

	@leave		CHttpWriter::EncodeGenericNumberHeaderL

	@todo		Is there any point in this? Why not call EncodeGenericNumberHeaderL()

				directly. 

*/

	{

	EncodeGenericNumberHeaderL(aHeader, KErrHttpEncodeContentLength);

	}

/*

 *	Methods from CHeaderWriter

 */

void CHttpGeneralHeaderWriter::EncodeHeaderL(RHeaderField& aHeader)

/**

	Encodes the header field value. 

	@internalComponent

	@param		aHeader		The header field to be encoded.

	@leave		CHttpGeneralHeaderWriter::EncodeCacheControlL

	@leave		CHttpGeneralHeaderWriter::EncodeConnectionL

	@leave		CHttpGeneralHeaderWriter::EncodeDateL

	@leave		CHttpGeneralHeaderWriter::EncodeTransferEncodingL

	@leave		CHttpGeneralHeaderWriter::EncodeContentLengthL

	@leave		CHttpWriter::DoTokenCsvListHeaderL

	@leave		KErrNotSupported	The writer was asked to encode a header that

									is does not support.

*/

	{

	RStringF fieldStr = iStringPool.StringF(aHeader.Name());

	switch( fieldStr.Index(iStringTable) )

		{

	case HTTP::ECacheControl:

		{

		EncodeCacheControlL(aHeader);

		} break;

	case HTTP::EConnection:

		{

		EncodeConnectionL(aHeader);

		} break;

	case HTTP::EDate:

		{

		EncodeDateL(aHeader);

		} break;

	case HTTP::EPragma:

		{

		// RFC2616 section 14.32 - 

		//

		//		Pragma				=	"Pragma" ":" 1#pragma-directive

		//		pragma-directive	=	"no-cache"	|	extension-pragma

		//		extension-pragma	=	token [ "=" ( token ! quoted-string ) ]

		//

		// The pragma header value is a comma separated list of values with at 

		// least one value.

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodePragma);

		} break;

	case HTTP::ETransferEncoding:

		{

		EncodeTransferEncodingL(aHeader);

		} break;

	case HTTP::EContentEncoding:

		{

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeContentEncoding);

		} break;

	case HTTP::EContentLanguage:

		{

		// RFC2616 section 14.12 - 

		// 

		//		Content-Language	=	"Content-Language" ":" 1#language-tag

		// 

		// The content-language header value is a comma separated list of values

		// with at least one value.

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeContentLanguage);

		} break;

	case HTTP::EUpgrade:

		{

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeUpgrade);

		} break;

	case HTTP::EContentLength:

		{

		EncodeContentLengthL(aHeader);

		} break;

	case HTTP::EContentLocation:

		{

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeContentLocation);

		} break;

	case HTTP::EContentMD5:

		{

		DoTokenCsvListHeaderL(aHeader, KErrHttpEncodeContentMD5);

		} break;

	case HTTP::EContentType:

		{

		EncodeContentTypeL(aHeader);

		} break;

	case HTTP::EExpires:

	case HTTP::ELastModified:

		{

		EncodeDateL(aHeader);

		}break;

	default:

		User::Leave(KErrNotSupported);

		break;

		}

	}