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