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/*
* Copyright (C) 2014-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/HashFunctions.h>
#include <wtf/HashTraits.h>
namespace WebCore {
class SessionID {
public:
SessionID()
: SessionID(emptySessionID())
{
}
enum SessionConstants : uint64_t {
EphemeralSessionMask = 0x8000000000000000,
DefaultSessionID = 1,
LegacyPrivateSessionID = DefaultSessionID | EphemeralSessionMask,
HashTableEmptyValueID = 0,
HashTableDeletedValueID = std::numeric_limits<uint64_t>::max(),
};
static SessionID emptySessionID() { return SessionID(HashTableEmptyValueID); }
static SessionID hashTableDeletedValue() { return SessionID(HashTableDeletedValueID); }
static SessionID defaultSessionID() { return SessionID(DefaultSessionID); }
static SessionID legacyPrivateSessionID() { return SessionID(LegacyPrivateSessionID); }
bool isValid() const { return m_sessionID != HashTableEmptyValueID && m_sessionID != HashTableDeletedValueID; }
bool isEphemeral() const { return m_sessionID & EphemeralSessionMask && m_sessionID != HashTableDeletedValueID; }
WEBCORE_EXPORT static SessionID generateEphemeralSessionID();
WEBCORE_EXPORT static SessionID generatePersistentSessionID();
WEBCORE_EXPORT static void enableGenerationProtection();
uint64_t sessionID() const { return m_sessionID; }
bool operator==(SessionID sessionID) const { return m_sessionID == sessionID.m_sessionID; }
bool operator!=(SessionID sessionID) const { return m_sessionID != sessionID.m_sessionID; }
bool isAlwaysOnLoggingAllowed() const { return !isEphemeral(); }
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static bool decode(Decoder&, SessionID&);
private:
explicit SessionID(uint64_t sessionID)
: m_sessionID(sessionID)
{
}
uint64_t m_sessionID;
};
template<class Encoder>
void SessionID::encode(Encoder& encoder) const
{
// FIXME: Eliminate places that encode invalid SessionIDs, then ASSERT here that the sessionID is valid.
encoder << m_sessionID;
}
template<class Decoder>
bool SessionID::decode(Decoder& decoder, SessionID& sessionID)
{
if (!decoder.decode(sessionID.m_sessionID))
return false;
// FIXME: Eliminate places that encode invalid SessionIDs, then fail to decode an invalid sessionID.
return true;
}
} // namespace WebCore
namespace WTF {
struct SessionIDHash {
static unsigned hash(const WebCore::SessionID& p) { return intHash(p.sessionID()); }
static bool equal(const WebCore::SessionID& a, const WebCore::SessionID& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebCore::SessionID> : GenericHashTraits<WebCore::SessionID> {
static WebCore::SessionID emptyValue() { return WebCore::SessionID::emptySessionID(); }
static void constructDeletedValue(WebCore::SessionID& slot) { slot = WebCore::SessionID::hashTableDeletedValue(); }
static bool isDeletedValue(const WebCore::SessionID& slot) { return slot == WebCore::SessionID::hashTableDeletedValue(); }
};
template<> struct DefaultHash<WebCore::SessionID> {
typedef SessionIDHash Hash;
};
} // namespace WTF
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