// Copyright (c) 2004-2009 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:

// CPolicyBase, CDbPolicy, CTblPolicy, CPolicyDomain classes

// 

//

#include "SC_Policy.h"

namespace DBSC

{

///////////////////////////////////////////////////////////////////////////////////////////

//CPolicyBase class

/**

*/

CPolicyBase::~CPolicyBase()

	{

	iPolicyCollection.Close();//Collection of R/W/S security policies

	}

#ifdef __DBDUMP__

/**

Dumps the content of a CPolicyBase instance to a text file.

@param aFile A reference to RFile object, which has to be used for the output.

*/

void CPolicyBase::Dump(RFile& aFile) const

	{

	DB_INVARIANT();

	_LIT8(KClassName, "Class: CPolicyBase. this=%X");

	_LIT8(KCount, "Security Policy, Count=%d");

	_LIT8(KCrLf, "\r\n");

	_LIT8(KPolicyType, "Policy type: ");

	_LIT8(KRead,   "Read, ");

	_LIT8(KWrite,  "Write, ");

	_LIT8(KSchema, "Schema, ");

	_LIT8(KPolicyData, "Policy data: ");

	_LIT8(KFmt, "%02X ");

	TBuf8<100> buf;

	buf.Format(KClassName, this);

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	TInt cnt = iPolicyCollection.Count();

	buf.Format(KCount, TInt32(cnt));

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	for(TInt i=0;i<cnt;++i)

		{

		const TPolicy& policy = iPolicyCollection[i];

		(void)aFile.Write(KPolicyType);

		switch(policy.iType)

			{

			case EPTRead:

				(void)aFile.Write(KRead);

				break;

			case EPTWrite:

				(void)aFile.Write(KWrite);

				break;

			case EPTSchema:

				(void)aFile.Write(KSchema);

				break;

			default:

				__ASSERT(0);

				break;

			}

		(void)aFile.Write(KPolicyData);

		TPtrC8 packet = policy.iData.Package();

		TInt len = packet.Length();

		for(TInt j=0;j<len;++j)

			{

			buf.Format(KFmt, packet[j]);

			(void)aFile.Write(buf);

			}

		(void)aFile.Write(KCrLf);

		}

	}

#endif//__DBDUMP__

/**

Standard phase-two construction method for CPolicyBase instance.

@param aPolicyCollection A const reference to a collection of R/W/S policies, which has to

       be used to control the access to a database object, controlled by CPolicyBase

	   instance.

*/

void CPolicyBase::ConstructL(const CPolicyBase::RPolicyCollection& aPolicyCollection)

	{

	iPolicyCollection.Reset();

	TInt cnt = aPolicyCollection.Count();

	for(TInt i=0;i<cnt;++i)

		{

		__LEAVE_IF_ERROR(iPolicyCollection.Append(aPolicyCollection[i]));

		}

	DB_INVARIANT();

	}

/**

It is used in the production code.

If the object data is not in a consistent state, the method will leave 

with KErrGeneral error.

@leave KErrGeneral, if the object data is not in a consistent state

*/

void CPolicyBase::InvariantL() const

	{

	TUint32 mask = 0;

	for(TInt i=(iPolicyCollection.Count()-1);i>-1;--i)

		{

		TPolicy& policy = const_cast <TPolicy&> (iPolicyCollection[i]);

		if(policy.iType == EPTNone)

			{

			__LEAVE(KErrGeneral);

			}

		if(mask & policy.iType)	//This security policy is duplicated

			{

			__LEAVE(KErrGeneral);

			}

		TPtrC8 packet = policy.iData.Package();

		if(policy.iData.Set(packet) != KErrNone)

			{

			__LEAVE(KErrGeneral);

			}

		mask |= policy.iType;

		}

	}

/**

This method implements pure virtual MPolicy::Get().

It searches object's policy collection for a policy of type aPolicyType

and initializes aPolicy parameter with the found policy.

@param aPolicyType Type of the requested security policy: read/write/schema

@param aPolicy Outout parameter, which will be initialized with the found security policy data.

@return System-wide error code, including KErrNotFound if the requested policy was not found.

*/

TInt CPolicyBase::Get(TPolicyType aPolicyType, TSecurityPolicy& aPolicy) const

	{

	DB_INVARIANT();

	TInt err = KErrNotFound;

	const TSecurityPolicy* securityPolicy = Policy(aPolicyType);

	if(securityPolicy)

		{

		err = aPolicy.Set(securityPolicy->Package());

		}

	return err;

	}

#ifdef __DBINVARIANT__

/**

Asserts the internal state of CPolicyBase instance.

It can be used for pre- or post- condition checks in CPolicyBase methods implementations.

*/

void CPolicyBase::Invariant() const

	{

	TRAPD(err, InvariantL());

	DB_INVARIANT_ASSERT(err == KErrNone);

	}

#endif//__DBINVARIANT__

/**

The method traverses the policies collection and searches for a policy of aPolicyType type.

If such a policy exists, a const pointer to it will be returned, otherwise - NULL.

@param aPolicyType Policy type - R/W/S

@return A const pointer to the found policy or NULL if not found.

*/

const TSecurityPolicy* CPolicyBase::Policy(TPolicyType aPolicyType) const

	{

	__ASSERT(aPolicyType != EPTNone);

	const TSecurityPolicy* policy = NULL;

	for(TInt i=(iPolicyCollection.Count()-1);i>-1;--i)

		{

		if(iPolicyCollection[i].iType == aPolicyType)

			{

			policy = &iPolicyCollection[i].iData;

			break;

			}

		}

	return policy;

	}

/**

Asserts caller capabilities/SID/VID.

@param aMessage An object whith caller capabilities/SID/VID, which has to be checked.

@param aPolicyType Policy type - R/W/S. 

@return EPCNotFound - the policy cannot be found

        EPCPassed - policy check passed

        EPCNotPassed - policy check not passed

*/

CPolicyBase::TPolicyCheckResult CPolicyBase::DoCheck(const RMessage2& aMessage, TPolicyType aPolicyType) const

	{

	const TSecurityPolicy* securityPolicy = Policy(aPolicyType);

	if(!securityPolicy)

		{

		return EPCNotFound;

		}

	return securityPolicy->CheckPolicy(aMessage) ? EPCPassed : EPCNotPassed;

	}

///////////////////////////////////////////////////////////////////////////////////////////

//CDbPolicy class

/**

*/

CDbPolicy::~CDbPolicy()

	{

	}

/**

Asserts caller capabilities/SID/VID.

@param aMessage An object whith caller capabilities/SID/VID, which has to be checked.

@param aPolicyType Policy type - R/W/S. 

@return ETrue The caller capabilities/SID/VID satisfy the specified security policy.

        EFalse The check not passed.

@panic EDBSCPolicyNotFound, if there is no such policy 

*/

TBool CDbPolicy::Check(const RMessage2& aMessage, TPolicyType aPolicyType) const

	{

	__ASSERT(aPolicyType != EPTNone);

	DB_INVARIANT();

	TPolicyCheckResult res = DoCheck(aMessage, aPolicyType);

	__ASSERT(res != EPCNotFound);

	return  res == EPCPassed ? ETrue : EFalse;

	}

/**

Standard phase-one factory method for CDbPolicy instance.

@param aPolicyCollection A const reference to a collection of R/W/S policies, which has to

       be used to control the access to the database, controlled by CDbPolicy instance.

@return A pointer to just created CDbPolicy instance.

@leave System-wide error codes, including KErrNoMemory.

*/

CDbPolicy* CDbPolicy::NewLC(const CPolicyBase::RPolicyCollection& aPolicyCollection)

	{

	CDbPolicy* self = new (ELeave) CDbPolicy;

	CleanupStack::PushL(self);

	self->ConstructL(aPolicyCollection);

	return self;

	}

#ifdef __DBDUMP__

/**

Dumps the content of a CDbPolicy instance to a text file.

@param aFile A reference to RFile object, which has to be used for the output.

*/

void CDbPolicy::Dump(RFile& aFile) const

	{

	DB_INVARIANT();

	_LIT8(KClassName, "Class: CDbPolicy. this=%X");

	_LIT8(KCrLf, "\r\n");

	_LIT8(KObjType, "Object: Database");

	_LIT8(KEnd, "==========================");

	TBuf8<40> buf;

	buf.Format(KClassName, this);

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	(void)aFile.Write(KObjType);

	(void)aFile.Write(KCrLf);

	CPolicyBase::Dump(aFile);

	(void)aFile.Write(KEnd);

	(void)aFile.Write(KCrLf);

	}

#endif//__DBDUMP__

/**

It is used in the production code.

If the object data is not in a consistent state, the method will leave 

with KErrGeneral error.

@leave KErrGeneral, if the object data is not in a consistent state

*/

void CDbPolicy::InvariantL() const

	{

	for(TInt c=0;c<KPolicyTypesCount;++c)

		{

		TPolicyType t = static_cast <TPolicyType> (1 << c);

		if(Policy(t) == NULL)

			{

			__LEAVE(KErrGeneral);

			}

		}

	CPolicyBase::InvariantL();

	}

///////////////////////////////////////////////////////////////////////////////////////////

//CTblPolicy class

/**

*/

CTblPolicy::~CTblPolicy()

	{

	delete iTblName;

	}

/**

Asserts caller capabilities/SID/VID.

@param aMessage An object whith caller capabilities/SID/VID, which has to be checked.

@param aPolicyType Policy type - R/W/S. 

@return ETrue The caller capabilities/SID/VID satisfy the specified security policy.

        EFalse The check not passed.

@panic EDBSCPolicyNotFound, if there is no such policy 

*/

TBool CTblPolicy::Check(const RMessage2& aMessage, TPolicyType aPolicyType) const

	{

	__ASSERT(aPolicyType != EPTNone);

	__ASSERT(iDbPolicy);

	DB_INVARIANT();

	TPolicyCheckResult res = EPCNotPassed;

	//1. Check database security policy

	if(iDbPolicy->Check(aMessage, aPolicyType))

		{

	//2. Check table security policy

		res = DoCheck(aMessage, aPolicyType);

		}

	//If there is no table security policy of the requested type - no problem, the database

	//security policy of that type has been checked already and the check passed.

	return res == EPCNotPassed ? EFalse : ETrue;

	}

/**

This method implements pure virtual MPolicy::Get().

It searches object's policy collection for a policy of type aPolicyType

and initializes aPolicy parameter with the found policy.

@param aPolicyType Type of the requested security policy: read/write

@param aPolicy Outout parameter, which will be initialized with the found security policy data.

@return System-wide error codes, including KErrNotSupported, if the request is for a schema policy.

*/

TInt CTblPolicy::Get(TPolicyType aPolicyType, TSecurityPolicy& aPolicy) const

	{

	if(aPolicyType == EPTSchema)

		{

		return KErrNotSupported;

		}

	DB_INVARIANT();

	TInt err = CPolicyBase::Get(aPolicyType, aPolicy);

	if(err == KErrNotFound)

		{

		err = iDbPolicy->Get(aPolicyType, aPolicy);

		}

	__ASSERT(err != KErrNotFound);

	return err;

	}

/**

Standard phase-one factory method for CTblPolicy instance.

@param aTblName Name of the controlled by this instance database table.

@param aPolicyCollection A const reference to a collection of R/W/S policies, which has to

       be used to control the access to the table, controlled by CTblPolicy instance.

@param aDbPolicy The related for the table database policy.

       CTblPolicy instance does not take the ownership on aDbPolicy pointer!        

@return A pointer to just created CTblPolicy instance.

@leave System-wide error codes, including KErrNoMemory.

*/

CTblPolicy* CTblPolicy::NewLC(const TDesC& aTblName, 

							  const CPolicyBase::RPolicyCollection& aPolicyCollection,

							  const CDbPolicy* aDbPolicy)

	{

	CTblPolicy* self = new (ELeave) CTblPolicy(aDbPolicy);

	CleanupStack::PushL(self);

	self->ConstructL(aTblName, aPolicyCollection);

	return self;

	}

#ifdef __DBDUMP__

/**

Dumps the content of a CTblPolicy instance to a text file.

@param aFile A reference to RFile object, which has to be used for the output.

*/

void CTblPolicy::Dump(RFile& aFile) const

	{

	DB_INVARIANT();

	_LIT8(KClassName, "Class: CTblPolicy. this=%X");

	_LIT8(KDbPolicyPtr, "Db policy ptr=%X");

	_LIT8(KCrLf, "\r\n");

	_LIT8(KName, "Table name: ");

	_LIT8(KObjType, "Object: Table");

	_LIT8(KEnd, "==========================");

	TBuf8<100> buf;

	buf.Format(KClassName, this);

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	(void)aFile.Write(KObjType);

	(void)aFile.Write(KCrLf);

	buf.Format(KDbPolicyPtr, iDbPolicy);

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	buf.Copy(KName);

	buf.Append(*iTblName);

	(void)aFile.Write(buf);

	(void)aFile.Write(KCrLf);

	CPolicyBase::Dump(aFile);

	(void)aFile.Write(KEnd);

	(void)aFile.Write(KCrLf);

	}

#endif//__DBDUMP__

/**

It is used in the production code.

If the object data is not in a consistent state, the method will leave 

with KErrGeneral error.

@leave KErrGeneral, if the object data is not in a consistent state

*/

void CTblPolicy::InvariantL() const

	{

	if(iDbPolicy == NULL)

		{

		__LEAVE(KErrGeneral);

		}

	if(iTblName == NULL || iTblName->Length() == 0)

		{

		__LEAVE(KErrGeneral);

		}

	if(Policy(EPTSchema) != NULL)

		{

		__LEAVE(KErrGeneral);

		}

	CPolicyBase::InvariantL();

	}

/**

Standard phase-two construction method for CTblPolicy instance.

@param aTblName Name of the controlled by this instance database table.

@param aPolicyCollection A const reference to a collection of R/W/S policies, which has to

       be used to control the access to the table object, controlled by CTblPolicy

	   instance.

*/

void CTblPolicy::ConstructL(const TDesC& aTblName, const CPolicyBase::RPolicyCollection& aPolicyCollection)

	{

	iTblName = HBufC::NewL(aTblName.Length());

	*iTblName = aTblName;

	CPolicyBase::ConstructL(aPolicyCollection);

	DB_INVARIANT();

	}

///////////////////////////////////////////////////////////////////////////////////////////

//CPolicyDomain class

/**

Standard phase-one factory method for CPolicyDomain instance.

@param aUid UID of the controlled by this instance security policy domain.

@param aPDLoader A reference to an implementation of MPolicyDomainLoader interface,

       which is used to load and add security policies to the controlled collection.

@return A pointer to just created CPolicyDomain instance.

@leave System-wide error codes, including KErrNoMemory.

*/

CPolicyDomain* CPolicyDomain::NewLC(TUid aUid, MPolicyDomainLoader& aPDLoader)

	{

	CPolicyDomain* self = new (ELeave) CPolicyDomain(aUid);

	CleanupStack::PushL(self);

	self->InternalizeL(aPDLoader);

	return self;

	}

/**

*/

CPolicyDomain::~CPolicyDomain()

	{

	Destroy();

	}

/**

The method returns the database policy interface.

@return A const pointer to the database policy interface in CPolicyDomain.

*/

const MPolicy* CPolicyDomain::DbPolicy() const

	{

	DB_INVARIANT();

	return iDbPolicy;

	}

/**

The method returns a table policy interface, identified by aTblName parameter.

@param aTblName Name of the table, which policy interface has to be retrieved.

@return A const pointer to the table policy interface, which is identified by aTblName parameter.

*/

const MPolicy* CPolicyDomain::TblPolicy(const TDesC& aTblName) const

	{

	__ASSERT(aTblName.Length() > 0);

	DB_INVARIANT();

	const MPolicy* policy = NULL;

	TInt cnt = iTPCollection.Count();

	for(TInt i=0;i<cnt;++i)

		{

		CTblPolicy* tblPolicy = iTPCollection[i];

		__ASSERT(tblPolicy);

		if(aTblName.CompareF(tblPolicy->TableName()) == 0)

			{

			policy = tblPolicy;

			break;

			}

		}

	if(!policy)

		{

		policy = iDbPolicy;

		}

	__ASSERT(policy);

	return policy;

	}

/**

Externalizes the security policy collection using MPolicyDomainPersister interface as an

persister.

@param aPDPersister A reference to an MPolicyDomainPersister implementation, which will 

       persist the controlled collection of security policies.

*/

void CPolicyDomain::ExternalizeL(MPolicyDomainPersister& aPDPersister) const

	{

	DB_INVARIANT();

	TPolicyDomainReader reader(*this);

	aPDPersister.RunL(reader);

	}