/**

* Copyright (c) 2003-2009 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 "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

* EPOC32 FTP Engine header file

* Author:	Philippe Gabriel

* Exports set of APIs simplyfying access to the FTP protocol

* 

*

*/

/**

 @file FTPSESS.H

 @internalComponent

*/

#if !defined(__FTPSESS_H__)

#define __FTPSESS_H__

#include <e32base.h>

#include <es_sock.h>

#include <f32file.h>

/**

The very first release

*/

/** FTPSESS.DLL major version number. */

#define FTPSESS_VERSION_MAJOR 0x01 // The very first release

/** FTPSESS.DLL minor version number. */

#define FTPSESS_VERSION_MINOR 0x03

/** FTPSESS.DLL version number. */

#define FTPSESS_VERSION_NUMBER (FTPSESS_VERSION_MAJOR<<8)|FTPSESS_VERSION_MINOR

// Following Def as per RFC 959

/** Default server port.

@internalComponent */

const TUint KDefaultServerPiPort = 21;

//

// MInterface definition to provide callback functions to the client

//

class MFtpSessionNotifier

/** FTP session callback interface.

*

* An FTP session client implements this interface to receive status and results 

* from asynchronous FTP operations.

* 

* Note that, as defined in RFC959, FTP does not allow concurrent execution of 

* several requests. Hence, even though calling an FTP function and getting the 

* result through this interface are asynchronous operations, these events happen 

* in a sequential manner. Each notification that the client receives corresponds 

* to only one currently outstanding operation.

* @internalComponent

*/

	{

public:

//

// Operation completion return codes.

// 

/** FTP engine/session operation completeness codes. */

	enum TOpComp 

		{

	/** Operation completed normally. */

		EOpComplete=0,	// No error

	/** Operation cancelled. */

		EOpCanceled,	// User canceled last operation

		//Connection errors

	/** Connection error: Connect address invalid. */

		EHostNotExist,	// Connect address invalid

	/** Connection error: Sockets level error. */

		ESocketError,	// Problem with socket operation

	/** Connection error: Connection failed. */

		EConnectionFailed,	// Can't connect to FTP port

	/** Connection error: Password needed. */

		EPasswordNeeded,

	/** Connection error: Anonymous login not permitted. */

		EAccountNeeded,	// i.e. anonymous login disallowed

	/** Connection error: UserName, Password combination invalid. */

		ELoginFailed,	// UserName,Password combination invalid

	/** Connection error: Not connected to a server. */

		ENotConnected,	// Not connected to a server

	/** Connection error: Already connected to a server. */

		EAlreadyConnected,	// Already connected to a server

	/** Connection error: Operation timed out. */

		ETimedOut,	// Inactive for too long

		//Local filesystem errors

	/** Local filesystem error: General file system error. */

		EFileSystemError, 

	/** Local filesystem error: File opening failure. */

		EFileOpenFailure, 

	/** Local filesystem error: File reading failure. */

		EFileReadError, 

	/** Local filesystem error: File writing failure. */

		EFileWriteError,

	/** Local filesystem error: File already exists. */

		EFileAlreadyExist,

	/** Local filesystem error: File does not exist. */

		EFileNotExist,

	/** Local filesystem error: Directory already exists. */

		EDirAlreadyExist,

	/** Local filesystem error: Directory does not exist. */

		EDirNotExist,

		// Permission error

	/** Permission error: Permission denied. */

		EPermissionDenied,

		//Remote filesystem errors

	/** Remote filesystem error: General remote file system error. */

		ERemoteFileSystemError, 

	/** Remote filesystem error: Remote file opening failure. */

		ERemoteFileOpenFailure, 

	/** Remote filesystem error: Remote file reading failure. */

		ERemoteFileReadError, 

	/** Remote filesystem error: Remote file writing failure. */

		ERemoteFileWriteError,

	/** Remote filesystem error: Remote file already exists. */

		ERemoteFileAlreadyExist,

	/** Remote filesystem error: Remote file does not exist. */

		ERemoteFileNotExist,

	/** Remote filesystem error: Remote directory already exists. */

		ERemoteDirAlreadyExist,

	/** Remote filesystem error: Remote directory does not exist. */

		ERemoteDirNotExist,

	/** Remote filesystem error: Restart is not supported. */

		ERestartNotSupported

		};

	/** Normal operation completion. */

	virtual void Complete(void)=0;

	// Operation completed, more data to follow

	/** Operation partially completed, with more data to follow. */

	virtual void MoreData(void)=0;

	/** Reports the amount of data already transferred in bytes.

	* 

	* @param aProgress	Amount of data already transferred */

	virtual void TransferProgress(TUint aProgress)=0;

	/** User cancelled an on-going operation. */

	virtual void Cancel(void)=0;

	/** Peer reset the connection. */

	virtual void ConnReset(void)=0;

	/** Error in establishing the connection with the FTP server.

	* 

	* @param aTConnectionError	Operation completion code */

	virtual void ConnectionError(TOpComp aTConnectionError)=0;

	// FTP server does not implement the operation requested

	/** Restart operation not supported. */

	virtual void OperationNotSupported(void)=0;

	// Local File system error

	/** Error with the local file system.

	* 

	* @param aTLocalFileSystemError	Operation completion code */

	virtual void LocalFileSystemError(TOpComp aTLocalFileSystemError)=0;

	// Remote File system error

	/** Error with the remote file system.

	* 

	* @param aTRemoteFileSystemError	Operation completion code */

	virtual void RemoteFileSystemError(TOpComp aTRemoteFileSystemError)=0;

	// Not specified yet

	/** Unspecified error. */

	virtual void EUnknownError()=0;

	// Message reported by server

/** Message sent by the FTP server.

* 

* As specified by the RFC, the server answers all requests from the 

* client with a plain text message beginning with a 3 digit code.

* The error/completion notifications sent back by the FTP session API 

* are derived from these codes. Additionally, this function can be 

* used to get the full string reporting the result of the request. 

* It is recommended that the user interface displays this string to 

* the user, as this gives a more precise idea of the result of the 

* requested operation, especially in case of error.

* 

* @param TDesC8	The message sent by the server */

	virtual void ServerMessage(const TDesC8&)=0;

    	};		

//

// The CFTPSession class

//

class CFTPSession : public CBase

/** Abstracts the complexity of the full FTP protocol and exports only 

* a few simplified APIs.

* @internalComponent */

	{

public:

/** FTP connection mode (passive or active see RFC959). */

	enum TConnectionMode 

		{

	/** Active mode. Server initiates DTP connection to client. */

		EActive=0, //(see RFC959)

	/** Passive mode. Client initiates DTP connection to server.*/

		Epassive   //(see RFC959)

		};

/** Representation type of a transferred file. */

	enum RepresentationType

		{

	/** Uninitialised. */

		EUninitialised=0,						   

	/** File transfered in Binary mode, no translation. */

		EBinary,

	/** File transfered in ASCII mode, translation. */

		EASCII

		};

/** FTP file transfer mode. */

	enum TransferMode

		{

	/** Stream mode; file transfered as a stream of bytes. */

		EStream=0,

	/** Block mode; file transfered as blocks, with header needed to restart aborted transfer. */

		Eblock 

		};

/** FTP file open mode. */

	enum TOpenMode

		{

	/** Overwrite existing file. */

		EOverwrite,

	/** Do not overwrite existing file. */

		ENoOverwrite,

	/** Expand existing file. */

		EExpand

		};

/** Construction */

public:

//

// Connection APIs

//

// Establish a connection with a server:

	/** Connects to a remote FTP server, specifying the FTP server by a numeric IP 

	* address.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::ConnectionError(), 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aNetAddr			FTP server's IP address

	* @param aUserName			User name to log on the FTP server

	* @param aPassword			Password to identify to the FTP server

	* @param aConnectionMode	Connection mode (passive or active, see RFC959). 

	* 							You must use passive mode if the client is behind a firewall. */

	virtual void Connect(	const TSockAddr& aNetAddr, //IP address

							const TDesC8& aUserName, 

							const TDesC8& aPassword,

							const TConnectionMode aConnectionMode=EActive)=0;

	/** Connects to a remote FTP server, specifying the FTP server by a DNS name.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::ConnectionError(), 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aServerName		FTP server's DNS name

	* @param aUserName			User name to log on the FTP server

	* @param aPassword			Password to identify to the FTP server

	* @param aConnectionMode	Connection mode (passive or active, see RFC959). You 

	* 							must use passive mode if the client is behind a firewall.

	* @param aPort				Port to connect to initiate the PI connection (see RFC959) */

	virtual void Connect(	const THostName& aServerName, //DNS name

							const TDesC8& aUserName, 

							const TDesC8& aPassword,

							const TConnectionMode aConnectionMode=EActive, 

							const TUint aPort=KDefaultServerPiPort)=0;

// Close connection with a server

	/** Closes the current connection with the FTP server.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), or MFtpSessionNotifier::EUnknownError().

	* 

	* This cannot be called when an operation is in progress. */

	virtual void Close()=0;

// Cancel last FTP operation

	/** Cancels the last FTP operation.

	* 

	* Cancel is only implemented for lengthy operations, that is: Connect(), Store(), 

	* Retrieve(), and ListDirectory(). For these operations, once cancel has been 

	* called, the MFtpSessionNotifier::Cancel() callback is called.

	* 

	* For other operations, calling Cancel() has no effect (it would take longer to 

	* wait for an acknowledgement to the Cancel(), than waiting for the result of 

	* the current operation). However, a completion callback will be called, as 

	* well as MFtpSessionNotifier::Cancel(). */

	virtual void Cancel()=0;

// Restart an aborted transfer operation

	/** After a connection is re-established, restarts the last aborted transfer operation 

	* (i.e. Store/Retrieve).

	* 

	* It is the responsibility of the client to remember and reset the state of 

	* the connection before attempting to resume the transfer: i.e. the client should 

	* re-establish the connection to the server and return to the relevant directory, 

	* then it should issue the Restart() command with the offset it has saved, and 

	* then issue the Store() or Retrieve() command.

	* 

	* The Restart() command should be avoided if the transfer was done in ASCII mode, 

	* as, because the server peforms a conversion on the bytestream format that 

	* it gets from the file before sending, the file size on the receiving end will 

	* be different than the size on the sending end. This means it is not possible 

	* to compute an offset for the sending end. 

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::OperationNotSupported(), 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aTFTPRestartOffset	An offset in bytes in the file from where transfer 

	* 							is to be resumed */

	virtual void Restart(const TUint aTFTPRestartOffset)=0;

//

// Transfer APIs

//

// Store a file on the server	

	/** Transfers a file to the FTP server.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::ConnectionError(), 

	* MFtpSessionNotifier::LocalFileSystemError(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aLocalFileName			Name of the local file to be transferred

	* @param aNewRemoteFileName		Name of the remote file to be created

	* @param aOverwrite				If ETrue, overwrite a remote file with the same name if it 

	* 								exists; if EFalse, fail if a remote file with the same name exists

	* @param aRepresentationType	The representation type of the transferred file, ASCII or Binary

	* @param aTransferMode			The transfer mode, stream mode or block mode. This is 

	* 								ignored and assumed to be stream, as block mode seems to be obsolete. */

	virtual void Store(	const TDesC& aLocalFileName,

						const TDesC8& aNewRemoteFileName,

						const TBool	aOverwrite = EFalse,

						const RepresentationType aRepresentationType = EBinary,

						const TransferMode aTransferMode = EStream)=0;

// Get a file from the server

	/** Transfers a file from the FTP server.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::LocalFileSystemError(), 

	* MFtpSessionNotifier::RemoteFileSystemError() or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aRemoteFileName		The remote file Name

	* @param aNewLocalFileName		Name of the local file to be created

	* @param aOpenMode				Specifies whether to overwrite a local file with the same 

	* 								name if it already exists

	* @param aRepresentationType	The representation type of the transferred file, 

	* 								ASCII or Binary

	* @param aTransferMode			The transfer mode, stream mode or block mode. This is 

	* 								ignored and assumed to be stream, as block mode seems to be obsolete. */

	virtual void Retrieve(	const TDesC8& aRemoteFileName,

							const TDesC& aNewLocalFileName,

							const TOpenMode	aOpenMode = EOverwrite,

							const RepresentationType aRepresentationType = EBinary,

							const TransferMode aTransferMode = EStream)=0;

//

// File system management functions

//

	/** Sets the current directory on the remote file system.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aDirectoryName	Directory name */

	virtual void ChangeDirectory(const TDesC8& aDirectoryName)=0;

	/** Creates a directory on the remote file system.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aDirectoryName	A directory name. This can be absolute or relative. */

	virtual void CreateDirectory(const TDesC8& aDirectoryName)=0;

	/** Deletes a directory on the remote file system.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aDirectoryName	A directory name. This can be absolute or relative. */

	virtual void DeleteDirectory(const TDesC8& aDirectoryName)=0;

	/** Gets the client's current directory on the remote file system.

	* 

	* The result is returned to the MFtpSessionNotifier::ServerMessage() callback. 

	* The directory name is defined by the RFC as being enclosed between double 

	* quotes: for example, an answer will look like:

	* 

	* @code

	* 257 "/developr/rfc" is current directory.

	* @endcode

	* The client must implement a parser to find the text between quotes.

	* 

	* The result can be passed in two or more consecutive calls of MFtpSessionNotifier::ServerMessage(). 

	* For example:

	* 

	* First call of MFtpSessionNotifier::ServerMessage(): @code 257 "/developr @endcode

	* 

	* Second call of MFtpSessionNotifier::ServerMessage(): @code /rfc" is current directory. @endcode

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError(). */

	virtual void GetCurrentDirectory(void)=0;

	/** Lists the files in a directory on the remote file system.

	* 

	* On successful completion, the aFileList buffer contains the list of files 

	* as transmitted by the server. It is the responsibility of the client to parse 

	* this buffer to extract relevant information. aFileList is always appended 

	* to, so the client should set its current length to a meaningful value (i.e. 

	* 0, to fill the buffer from scratch).

	* 

	* If the list of files is larger than the aFileList buffer, MFtpSessionNotifier::MoreData() 

	* is called. At this point, the client must reissue the ListDirectory() request 

	* until the MFtpSessionNotifier::Complete() is called.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aDirectoryName	A directory name. This can be absolute or relative.

	* @param aFileList		On completion, the file list. The buffer is allocated by the client. */

	virtual void ListDirectory(const	TDesC8& aDirectoryName,

										TDes8& aFileList)=0;

	/** Deletes a file on the remote file system.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aFileName	A file name */

	virtual void DeleteFile(const TDesC8& aFileName)=0;

	/** Renames a file on the remote file system.

	* 

	* Completion is indicated by a callback to one of MFtpSessionNotifier::Complete(), 

	* MFtpSessionNotifier::ConnReset(), MFtpSessionNotifier::RemoteFileSystemError() 

	* or MFtpSessionNotifier::EUnknownError().

	* 

	* @param aRemoteFileName	An existing file name

	* @param aNewRemoteFileName	A new file name */

	virtual void RenameFile(const TDesC8& aRemoteFileName,

							const TDesC8& aNewRemoteFileName)=0;

	/**

	Returns 32-bit, with 

	ftpsess dll MAJOR_VERSION in msb of the msw

	ftpsess dll MINOR_VERSION in lsb of the msw

	ftpprot dll MAJOR_VERSION in msb of the lsw

	ftpprot dll MINOR_VERSION in lsb of the lsw

	*/

	IMPORT_C static TUint32 GetVersion(void);

	/** Allocates and constructs a new FTP session object. 

	* 

	* @param aNotifier	Callback interface to notify the client of the completion of 

	* 					operations or to report errors. For each FTP session, the FTP 

	* 					client should instantiate an object of this type.

	* @return			New FTP session object

	*/

	IMPORT_C static CFTPSession* NewL(MFtpSessionNotifier* aNotifier);

	/**Destructor.*/

	virtual ~CFTPSession();

};

#endif