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/*
* Copyright (C) 2019 Igalia S.L.
*
* 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.
*/
#include "config.h"
#include "PrefetchCache.h"
#include <WebCore/HTTPHeaderNames.h>
#include <wtf/TZoneMallocInlines.h>
namespace WebKit {
WTF_MAKE_TZONE_ALLOCATED_IMPL(PrefetchCache);
PrefetchCache::Entry::Entry(WebCore::ResourceResponse&& response, PrivateRelayed privateRelayed, RefPtr<WebCore::FragmentedSharedBuffer>&& buffer)
: response(WTFMove(response))
, privateRelayed(privateRelayed)
, buffer(WTFMove(buffer))
{
}
PrefetchCache::Entry::Entry(WebCore::ResourceResponse&& redirectResponse, WebCore::ResourceRequest&& redirectRequest)
: response(WTFMove(redirectResponse)), redirectRequest(WTFMove(redirectRequest))
{
}
PrefetchCache::PrefetchCache()
: m_expirationTimer(*this, &PrefetchCache::clearExpiredEntries)
{
}
PrefetchCache::~PrefetchCache()
{
}
void PrefetchCache::clear()
{
m_expirationTimer.stop();
m_sessionExpirationList.clear();
if (m_sessionPrefetches)
m_sessionPrefetches->clear();
}
std::unique_ptr<PrefetchCache::Entry> PrefetchCache::take(const URL& url)
{
auto* resources = m_sessionPrefetches.get();
if (!resources)
return nullptr;
m_sessionExpirationList.removeAllMatching([&url] (const auto& tuple) {
return std::get<0>(tuple) == url;
});
auto entry = resources->take(url);
ASSERT(!entry || !entry->response.httpHeaderField(WebCore::HTTPHeaderName::Vary).contains("Cookie"_s));
return entry;
}
static const Seconds expirationTimeout { 5_s };
void PrefetchCache::store(const URL& requestURL, WebCore::ResourceResponse&& response, PrivateRelayed privateRelayed, RefPtr<WebCore::FragmentedSharedBuffer>&& buffer)
{
if (!m_sessionPrefetches)
m_sessionPrefetches = makeUnique<PrefetchEntriesMap>();
auto addResult = m_sessionPrefetches->add(requestURL, makeUnique<PrefetchCache::Entry>(WTFMove(response), privateRelayed, WTFMove(buffer)));
// Limit prefetches for same url to 1.
if (!addResult.isNewEntry)
return;
m_sessionExpirationList.append(std::make_tuple(requestURL, WallTime::now()));
if (!m_expirationTimer.isActive())
m_expirationTimer.startOneShot(expirationTimeout);
}
void PrefetchCache::storeRedirect(const URL& requestUrl, WebCore::ResourceResponse&& redirectResponse, WebCore::ResourceRequest&& redirectRequest)
{
if (!m_sessionPrefetches)
m_sessionPrefetches = makeUnique<PrefetchEntriesMap>();
redirectRequest.clearPurpose();
m_sessionPrefetches->set(requestUrl, makeUnique<PrefetchCache::Entry>(WTFMove(redirectResponse), WTFMove(redirectRequest)));
m_sessionExpirationList.append(std::make_tuple(requestUrl, WallTime::now()));
if (!m_expirationTimer.isActive())
m_expirationTimer.startOneShot(expirationTimeout);
}
void PrefetchCache::clearExpiredEntries()
{
auto timeout = WallTime::now();
while (!m_sessionExpirationList.isEmpty()) {
auto& [requestUrl, timestamp] = m_sessionExpirationList.first();
auto* resources = m_sessionPrefetches.get();
ASSERT(resources);
ASSERT(resources->contains(requestUrl));
auto elapsed = timeout - timestamp;
if (elapsed > expirationTimeout) {
resources->remove(requestUrl);
m_sessionExpirationList.removeFirst();
} else {
m_expirationTimer.startOneShot(expirationTimeout - elapsed);
break;
}
}
}
}
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