gecko-dev/extensions/cookie/nsPermissionManager.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#ifndef nsPermissionManager_h__
#define nsPermissionManager_h__
#include "nsIPermissionManager.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWeakReference.h"
#include "nsCOMPtr.h"
#include "nsVoidArray.h"
#include "nsIFile.h"
#include "nsTHashtable.h"
#include "nsString.h"
#include "nsITimer.h"
class nsIPermission;
////////////////////////////////////////////////////////////////////////////////
// This allow us 8 types of permissions, with 256 values for each
// permission (some types might want to prompt, block 3rd party etc).
// Note that nsIPermissionManager.idl only allows 16 values for permission,
// and that nsPermissionManager::Write() can only deal with 26 values of
// permission safely. (We allow space for 256 here, since it's faster to
// deal with bytes than with bits).
// Note: When changing NUMBER_OF_TYPES, also update PermissionsAreEmpty()
// and the constructors.
// This should be a multiple of 4, to make PermissionsAreEmpty() fast
#define NUMBER_OF_TYPES (8)
#define NUMBER_OF_PERMISSIONS (16)
class nsHostEntry : public PLDHashEntryHdr
{
public:
// Hash methods
typedef const char* KeyType;
typedef const char* KeyTypePointer;
nsHostEntry(const char* aHost);
nsHostEntry(const nsHostEntry& toCopy);
~nsHostEntry()
{
}
KeyType GetKey() const
{
return mHost;
}
KeyTypePointer GetKeyPointer() const
{
return mHost;
}
PRBool KeyEquals(KeyTypePointer aKey) const
{
return !strcmp(mHost, aKey);
}
static KeyTypePointer KeyToPointer(KeyType aKey)
{
return aKey;
}
static PLDHashNumber HashKey(KeyTypePointer aKey)
{
// PL_DHashStringKey doesn't use the table parameter, so we can safely
// pass nsnull
return PL_DHashStringKey(nsnull, aKey);
}
enum { ALLOW_MEMMOVE = PR_TRUE };
// Permissions methods
inline const nsDependentCString GetHost() const
{
return nsDependentCString(mHost);
}
// Callers must do boundary checks
void SetPermission(PRInt32 aTypeIndex, PRUint32 aPermission)
{
mPermissions[aTypeIndex] = (PRUint8)aPermission;
}
PRUint32 GetPermission(PRInt32 aTypeIndex) const
{
return (PRUint32)mPermissions[aTypeIndex];
}
PRBool PermissionsAreEmpty() const
{
// Cast to PRUint32, to make this faster. Only 2 checks instead of 8
return (*NS_REINTERPRET_CAST(const PRUint32*, &mPermissions[0])==0 &&
*NS_REINTERPRET_CAST(const PRUint32*, &mPermissions[4])==0 );
}
private:
const char *mHost;
// This will contain the permissions for different types, in a bitmasked
// form. The type itself defines the position.
// One byte per permission. This is a small loss of memory (as 255 types
// of action per type is a lot, 16 would be enough), but will improve speed
// Bytemasking is around twice as fast (on one arch at least) than bitmasking
PRUint8 mPermissions[NUMBER_OF_TYPES];
};
class nsPermissionManager : public nsIPermissionManager,
public nsIObserver,
public nsSupportsWeakReference
{
public:
// nsISupports
NS_DECL_ISUPPORTS
NS_DECL_NSIPERMISSIONMANAGER
NS_DECL_NSIOBSERVER
nsPermissionManager();
virtual ~nsPermissionManager();
nsresult Init();
private:
nsresult AddInternal(const nsAFlatCString &aHost,
PRInt32 aTypeIndex,
PRUint32 aPermission,
PRBool aNotify);
PRInt32 GetTypeIndex(const char *aTypeString,
PRBool aAdd);
nsHostEntry *GetHostEntry(const nsAFlatCString &aHost,
PRUint32 aType);
// Use LazyWrite to save the permissions file on a timer. It will write
// the file only once if repeatedly hammered quickly.
void LazyWrite();
static void DoLazyWrite(nsITimer *aTimer, void *aClosure);
nsresult Write();
nsresult Read();
void NotifyObserversWithPermission(const nsACString &aHost,
const char *aType,
PRUint32 aPermission,
const PRUnichar *aData);
void NotifyObservers(nsIPermission *aPermission, const PRUnichar *aData);
nsresult RemoveAllFromMemory();
nsresult GetHost(nsIURI *aURI, nsACString &aResult);
void RemoveTypeStrings();
nsCOMPtr<nsIObserverService> mObserverService;
nsCOMPtr<nsIFile> mPermissionsFile;
nsCOMPtr<nsITimer> mWriteTimer;
nsTHashtable<nsHostEntry> mHostTable;
PRUint32 mHostCount;
PRPackedBool mChangedList;
PRPackedBool mHasUnknownTypes;
// An array to store the strings identifying the different types.
char *mTypeArray[NUMBER_OF_TYPES];
};
// {4F6B5E00-0C36-11d5-A535-0010A401EB10}
#define NS_PERMISSIONMANAGER_CID \
{ 0x4f6b5e00, 0xc36, 0x11d5, { 0xa5, 0x35, 0x0, 0x10, 0xa4, 0x1, 0xeb, 0x10 } }
#endif /* nsPermissionManager_h__ */