httpclientengine.h

SYMBIAN S60 2ND列车时刻表软件

/*
* ==============================================================================
*  Name        : CHttpClientEngine.h
*  Part of     : MOPlay V1 S60
*  Description : Defines the CHttpClientEngine interface.
*  Version     : 1
*  Author	   : Johnson
*  Create date : 2007-4-11
*  Last Update : Johnson
*  Update date : 2007-5-29
* ==============================================================================
*/

#ifndef WEBCLIENTENGINE_H
#define WEBCLIENTENGINE_H

// INCLUDES
#include <coecntrl.h>
#include <http.h>
#include <http\mhttpauthenticationcallback.h>

// CONSTANTS
const TInt KMaxHeaderNameLength     = 32;
const TInt KMaxHeaderValueLength    = 128;
const TInt KMaxAuthTypeLength       = 128;
const TInt KMaxDateTimeStringLength = 40;
const TInt KMaxStatusTextLength     = 32;

// Used user agent for requests
_LIT8( KUserAgent, "WebClient 1.0" );

// This client accepts all content types.
// (change to e.g. "text/plain" for plain text only)
_LIT8( KAccept, "*/*" );

// Format for output of data/time values
_LIT( KDateFormat,"%D%M%Y%/0%1%/1%2%/2%3%/3 %:0%H%:1%T%:2%S.%C%:3" );

// Some texts for header output
_LIT( KColon, ": " );
_LIT( Krealm, "Realm: " );


// FORWARD DECLARATIONS
class CPluginAdapter;

#ifndef WEBCLIENTOBSERVER_H
#define WEBCLIENTOBSERVER_H

// CLASS DECLARATION

class MWebClientObserver 
    {
    public:
        virtual void ClientEvent( const TDesC& aEventDescription ) = 0;

    public:
        virtual void ClientHeaderReceived( const TDesC& aHeaderData ) = 0;
        virtual void ClientBodyReceived( const TDesC8& aBodyData ) = 0;
        virtual void ClientSuccess() = 0;
        virtual void ClientFailed() = 0;
    };

#endif

class CHttpClientEngine : public CBase, 
                         public MHTTPTransactionCallback,
                         public MHTTPAuthenticationCallback
    {
    public:
        static CHttpClientEngine* NewL( MWebClientObserver& aObserver );
        static CHttpClientEngine* NewLC( MWebClientObserver& aObserver );
        ~CHttpClientEngine();

        void IssueHTTPGetL( const TDesC8& aUri );
        void CancelTransactionL();
        inline TBool IsRunning() { return iRunning; };
    private:
        void ConstructL();
        CHttpClientEngine( MWebClientObserver& iObserver );
        void SetHeaderL( RHTTPHeaders aHeaders, TInt aHdrField, 
                         const TDesC8& aHdrValue );
        void DumpRespHeadersL( RHTTPTransaction& aTransantion );
        void HandleRunErrorL( TInt aError );
    private:
        void MHFRunL( RHTTPTransaction aTransaction, const THTTPEvent& aEvent );
        TInt MHFRunError( TInt aError, 
                          RHTTPTransaction aTransaction, 
                          const THTTPEvent& aEvent );
    private:
        TBool GetCredentialsL(  const TUriC8& aUri, 
                                RString aRealm, 
                                RStringF aAuthenticationType, 
                                RString& aUsername, 
                                RString& aPassword );

    private: // Data
        RHTTPSession            iSession;
        RHTTPTransaction        iTransaction;
        MWebClientObserver&     iObserver;      // Used for passing body data and
                                                // events to UI.
        TBool                   iRunning;       // ETrue, if transaction running
    };

#endif // WEBCLIENTENGINE_H