/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "core/loader/appcache/ApplicationCacheHost.h"

#include "bindings/core/v8/ExceptionStatePlaceholder.h"
#include "core/events/ApplicationCacheErrorEvent.h"
#include "core/events/ProgressEvent.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/inspector/InspectorApplicationCacheAgent.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/loader/DocumentLoader.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/loader/appcache/ApplicationCache.h"
#include "core/page/FrameTree.h"
#include "core/page/Page.h"
#include "platform/exported/WrappedResourceRequest.h"
#include "platform/exported/WrappedResourceResponse.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "public/platform/WebURL.h"
#include "public/platform/WebURLError.h"
#include "public/platform/WebURLResponse.h"
#include "public/platform/WebVector.h"

using namespace blink;

namespace blink {

// We provide a custom implementation of this class that calls out to the
// embedding application instead of using WebCore's built in appcache system.
// This file replaces webcore/appcache/ApplicationCacheHost.cpp in our build.

ApplicationCacheHost::ApplicationCacheHost(DocumentLoader* documentLoader)
    : m_domApplicationCache(0)
    , m_documentLoader(documentLoader)
    , m_defersEvents(true)
{
    ASSERT(m_documentLoader);
}

ApplicationCacheHost::~ApplicationCacheHost()
{
}

void ApplicationCacheHost::willStartLoadingMainResource(ResourceRequest& request)
{
    // We defer creating the outer host object to avoid spurious creation/destruction
    // around creating empty documents. At this point, we're initiating a main resource
    // load for the document, so its for real.

    if (!isApplicationCacheEnabled())
        return;

    ASSERT(m_documentLoader->frame());
    LocalFrame& frame = *m_documentLoader->frame();
    m_host = frame.loader().client()->createApplicationCacheHost(this);
    if (m_host) {
        WrappedResourceRequest wrapped(request);

        const WebApplicationCacheHost* spawningHost = 0;
        Frame* spawningFrame = frame.tree().parent();
        if (!spawningFrame || !spawningFrame->isLocalFrame())
            spawningFrame = frame.loader().opener();
        if (!spawningFrame || !spawningFrame->isLocalFrame())
            spawningFrame = &frame;
        if (DocumentLoader* spawningDocLoader = toLocalFrame(spawningFrame)->loader().documentLoader())
            spawningHost = spawningDocLoader->applicationCacheHost() ? spawningDocLoader->applicationCacheHost()->m_host.get() : 0;

        m_host->willStartMainResourceRequest(wrapped, spawningHost);
    }

    // NOTE: The semantics of this method, and others in this interface, are subtly different
    // than the method names would suggest. For example, in this method never returns an appcached
    // response in the SubstituteData out argument, instead we return the appcached response thru
    // the usual resource loading pipeline.
}

void ApplicationCacheHost::selectCacheWithoutManifest()
{
    if (m_host)
        m_host->selectCacheWithoutManifest();
}

void ApplicationCacheHost::selectCacheWithManifest(const KURL& manifestURL)
{
    if (m_host && !m_host->selectCacheWithManifest(manifestURL)) {
        // It's a foreign entry, restart the current navigation from the top
        // of the navigation algorithm. The navigation will not result in the
        // same resource being loaded, because "foreign" entries are never picked
        // during navigation.
        // see blink::ApplicationCacheGroup::selectCache()
        LocalFrame* frame = m_documentLoader->frame();
        frame->navigationScheduler().scheduleLocationChange(frame->document(), frame->document()->url(), Referrer(frame->document()->referrer(), frame->document()->referrerPolicy()));
    }
}

void ApplicationCacheHost::didReceiveResponseForMainResource(const ResourceResponse& response)
{
    if (m_host) {
        WrappedResourceResponse wrapped(response);
        m_host->didReceiveResponseForMainResource(wrapped);
    }
}

void ApplicationCacheHost::mainResourceDataReceived(const char* data, int length)
{
    if (m_host)
        m_host->didReceiveDataForMainResource(data, length);
}

void ApplicationCacheHost::failedLoadingMainResource()
{
    if (m_host)
        m_host->didFinishLoadingMainResource(false);
}

void ApplicationCacheHost::finishedLoadingMainResource()
{
    if (m_host)
        m_host->didFinishLoadingMainResource(true);
}

void ApplicationCacheHost::willStartLoadingResource(ResourceRequest& request)
{
    if (m_host) {
        WrappedResourceRequest wrapped(request);
        m_host->willStartSubResourceRequest(wrapped);
    }
}

void ApplicationCacheHost::setApplicationCache(ApplicationCache* domApplicationCache)
{
    ASSERT(!m_domApplicationCache || !domApplicationCache);
    m_domApplicationCache = domApplicationCache;
}

void ApplicationCacheHost::notifyApplicationCache(EventID id, int progressTotal, int progressDone, blink::WebApplicationCacheHost::ErrorReason errorReason, const String& errorURL, int errorStatus, const String& errorMessage)
{
    if (id != PROGRESS_EVENT)
        InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader->frame());

    if (m_defersEvents) {
        // Event dispatching is deferred until document.onload has fired.
        m_deferredEvents.append(DeferredEvent(id, progressTotal, progressDone, errorReason, errorURL, errorStatus, errorMessage));
        return;
    }
    dispatchDOMEvent(id, progressTotal, progressDone, errorReason, errorURL, errorStatus, errorMessage);
}

ApplicationCacheHost::CacheInfo ApplicationCacheHost::applicationCacheInfo()
{
    if (!m_host)
        return CacheInfo(KURL(), 0, 0, 0);

    blink::WebApplicationCacheHost::CacheInfo webInfo;
    m_host->getAssociatedCacheInfo(&webInfo);
    return CacheInfo(webInfo.manifestURL, webInfo.creationTime, webInfo.updateTime, webInfo.totalSize);
}

void ApplicationCacheHost::fillResourceList(ResourceInfoList* resources)
{
    if (!m_host)
        return;

    blink::WebVector<blink::WebApplicationCacheHost::ResourceInfo> webResources;
    m_host->getResourceList(&webResources);
    for (size_t i = 0; i < webResources.size(); ++i) {
        resources->append(ResourceInfo(
            webResources[i].url, webResources[i].isMaster, webResources[i].isManifest, webResources[i].isFallback,
            webResources[i].isForeign, webResources[i].isExplicit, webResources[i].size));
    }
}

void ApplicationCacheHost::stopDeferringEvents()
{
    RefPtr<DocumentLoader> protect(documentLoader());
    for (unsigned i = 0; i < m_deferredEvents.size(); ++i) {
        const DeferredEvent& deferred = m_deferredEvents[i];
        dispatchDOMEvent(deferred.eventID, deferred.progressTotal, deferred.progressDone, deferred.errorReason, deferred.errorURL, deferred.errorStatus, deferred.errorMessage);
    }
    m_deferredEvents.clear();
    m_defersEvents = false;
}

void ApplicationCacheHost::dispatchDOMEvent(EventID id, int progressTotal, int progressDone, blink::WebApplicationCacheHost::ErrorReason errorReason, const String& errorURL, int errorStatus, const String& errorMessage)
{
    if (m_domApplicationCache) {
        const AtomicString& eventType = ApplicationCache::toEventType(id);
        RefPtrWillBeRawPtr<Event> event = nullptr;
        if (id == PROGRESS_EVENT)
            event = ProgressEvent::create(eventType, true, progressDone, progressTotal);
        else if (id == ERROR_EVENT)
            event = ApplicationCacheErrorEvent::create(errorReason, errorURL, errorStatus, errorMessage);
        else
            event = Event::create(eventType);
        m_domApplicationCache->dispatchEvent(event, ASSERT_NO_EXCEPTION);
    }
}

ApplicationCacheHost::Status ApplicationCacheHost::status() const
{
    return m_host ? static_cast<Status>(m_host->status()) : UNCACHED;
}

bool ApplicationCacheHost::update()
{
    return m_host ? m_host->startUpdate() : false;
}

bool ApplicationCacheHost::swapCache()
{
    bool success = m_host ? m_host->swapCache() : false;
    if (success)
        InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader->frame());
    return success;
}

void ApplicationCacheHost::abort()
{
    if (m_host)
        m_host->abort();
}

bool ApplicationCacheHost::isApplicationCacheEnabled()
{
    ASSERT(m_documentLoader->frame());
    return m_documentLoader->frame()->settings() && m_documentLoader->frame()->settings()->offlineWebApplicationCacheEnabled();
}

void ApplicationCacheHost::didChangeCacheAssociation()
{
    // FIXME: Prod the inspector to update its notion of what cache the page is using.
}

void ApplicationCacheHost::notifyEventListener(blink::WebApplicationCacheHost::EventID eventID)
{
    notifyApplicationCache(static_cast<ApplicationCacheHost::EventID>(eventID), 0, 0, blink::WebApplicationCacheHost::UnknownError, String(), 0, String());
}

void ApplicationCacheHost::notifyProgressEventListener(const blink::WebURL&, int progressTotal, int progressDone)
{
    notifyApplicationCache(PROGRESS_EVENT, progressTotal, progressDone, blink::WebApplicationCacheHost::UnknownError, String(), 0, String());
}

void ApplicationCacheHost::notifyErrorEventListener(blink::WebApplicationCacheHost::ErrorReason reason, const blink::WebURL& url, int status, const blink::WebString& message)
{
    notifyApplicationCache(ERROR_EVENT, 0, 0, reason, url.string(), status, message);
}

} // namespace blink
