/*
 * Copyright (C) 2009 Google 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:
 *
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "web/WebSharedWorkerImpl.h"

#include "core/dom/CrossThreadTask.h"
#include "core/dom/Document.h"
#include "core/events/MessageEvent.h"
#include "core/html/HTMLFormElement.h"
#include "core/inspector/ConsoleMessage.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/inspector/WorkerDebuggerAgent.h"
#include "core/inspector/WorkerInspectorController.h"
#include "core/loader/FrameLoadRequest.h"
#include "core/loader/FrameLoader.h"
#include "core/page/Page.h"
#include "core/workers/SharedWorkerGlobalScope.h"
#include "core/workers/SharedWorkerThread.h"
#include "core/workers/WorkerClients.h"
#include "core/workers/WorkerGlobalScope.h"
#include "core/workers/WorkerInspectorProxy.h"
#include "core/workers/WorkerLoaderProxy.h"
#include "core/workers/WorkerScriptLoader.h"
#include "core/workers/WorkerThreadStartupData.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/ThreadSafeFunctional.h"
#include "platform/heap/Handle.h"
#include "platform/network/ContentSecurityPolicyParsers.h"
#include "platform/network/ResourceResponse.h"
#include "platform/weborigin/KURL.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "public/platform/WebFileError.h"
#include "public/platform/WebMessagePortChannel.h"
#include "public/platform/WebString.h"
#include "public/platform/WebURL.h"
#include "public/platform/WebURLRequest.h"
#include "public/web/WebDevToolsAgent.h"
#include "public/web/WebFrame.h"
#include "public/web/WebSettings.h"
#include "public/web/WebView.h"
#include "public/web/WebWorkerContentSettingsClientProxy.h"
#include "public/web/modules/serviceworker/WebServiceWorkerNetworkProvider.h"
#include "web/LocalFileSystemClient.h"
#include "web/WebDataSourceImpl.h"
#include "web/WebLocalFrameImpl.h"
#include "web/WorkerContentSettingsClient.h"
#include "wtf/Functional.h"
#include "wtf/MainThread.h"

namespace blink {

// TODO(toyoshim): Share implementation with WebEmbeddedWorkerImpl as much as
// possible.

WebSharedWorkerImpl::WebSharedWorkerImpl(WebSharedWorkerClient* client)
    : m_webView(nullptr)
    , m_mainFrame(nullptr)
    , m_askedToTerminate(false)
    , m_workerInspectorProxy(WorkerInspectorProxy::create())
    , m_client(client)
    , m_pauseWorkerContextOnStart(false)
    , m_isPausedOnStart(false)
    , m_creationAddressSpace(WebAddressSpacePublic)
{
}

WebSharedWorkerImpl::~WebSharedWorkerImpl()
{
    ASSERT(m_webView);
    // Detach the client before closing the view to avoid getting called back.
    m_mainFrame->setClient(0);

    m_webView->close();
    m_mainFrame->close();
    if (m_loaderProxy)
        m_loaderProxy->detachProvider(this);
}

void WebSharedWorkerImpl::terminateWorkerThread()
{
    if (m_askedToTerminate)
        return;
    m_askedToTerminate = true;
    if (m_mainScriptLoader) {
        m_mainScriptLoader->cancel();
        m_mainScriptLoader.clear();
        m_client->workerScriptLoadFailed();
        delete this;
        return;
    }
    if (m_workerThread)
        m_workerThread->terminate();
    m_workerInspectorProxy->workerThreadTerminated();
}

void WebSharedWorkerImpl::initializeLoader()
{
    // Create 'shadow page'. This page is never displayed, it is used to proxy the
    // loading requests from the worker context to the rest of WebKit and Chromium
    // infrastructure.
    ASSERT(!m_webView);
    m_webView = WebView::create(0);
    // FIXME: http://crbug.com/363843. This needs to find a better way to
    // not create graphics layers.
    m_webView->settings()->setAcceleratedCompositingEnabled(false);
    // FIXME: Settings information should be passed to the Worker process from Browser process when the worker
    // is created (similar to RenderThread::OnCreateNewView).
    m_mainFrame = toWebLocalFrameImpl(WebLocalFrame::create(WebTreeScopeType::Document, this));
    m_webView->setMainFrame(m_mainFrame.get());
    m_mainFrame->setDevToolsAgentClient(this);

    // If we were asked to pause worker context on start and wait for debugger then it is the good time to do that.
    m_client->workerReadyForInspection();
    if (m_pauseWorkerContextOnStart) {
        m_isPausedOnStart = true;
        return;
    }
    loadShadowPage();
}

WebApplicationCacheHost* WebSharedWorkerImpl::createApplicationCacheHost(WebApplicationCacheHostClient* appcacheHostClient)
{
    return m_client->createApplicationCacheHost(appcacheHostClient);
}

void WebSharedWorkerImpl::loadShadowPage()
{
    // Construct substitute data source for the 'shadow page'. We only need it
    // to have same origin as the worker so the loading checks work correctly.
    CString content("");
    RefPtr<SharedBuffer> buffer(SharedBuffer::create(content.data(), content.length()));
    m_mainFrame->frame()->loader().load(FrameLoadRequest(0, ResourceRequest(m_url), SubstituteData(buffer, "text/html", "UTF-8", KURL())));
}

void WebSharedWorkerImpl::willSendRequest(
    WebLocalFrame* frame, unsigned, WebURLRequest& request,
    const WebURLResponse& redirectResponse)
{
    if (m_networkProvider)
        m_networkProvider->willSendRequest(frame->dataSource(), request);
}

void WebSharedWorkerImpl::didFinishDocumentLoad(WebLocalFrame* frame, bool)
{
    ASSERT(!m_loadingDocument);
    ASSERT(!m_mainScriptLoader);
    m_networkProvider = adoptPtr(m_client->createServiceWorkerNetworkProvider(frame->dataSource()));
    m_mainScriptLoader = WorkerScriptLoader::create();
    m_mainScriptLoader->setRequestContext(WebURLRequest::RequestContextSharedWorker);
    m_loadingDocument = toWebLocalFrameImpl(frame)->frame()->document();
    m_mainScriptLoader->loadAsynchronously(
        *m_loadingDocument.get(),
        m_url,
        DenyCrossOriginRequests,
        m_creationAddressSpace,
        bind(&WebSharedWorkerImpl::didReceiveScriptLoaderResponse, this),
        bind(&WebSharedWorkerImpl::onScriptLoaderFinished, this));
    // Do nothing here since onScriptLoaderFinished() might have been already
    // invoked and |this| might have been deleted at this point.
}

bool WebSharedWorkerImpl::isControlledByServiceWorker(WebDataSource& dataSource)
{
    return m_networkProvider && m_networkProvider->isControlledByServiceWorker(dataSource);
}

int64_t WebSharedWorkerImpl::serviceWorkerID(WebDataSource& dataSource)
{
    if (!m_networkProvider)
        return -1;
    return m_networkProvider->serviceWorkerID(dataSource);
}

void WebSharedWorkerImpl::sendProtocolMessage(int sessionId, int callId, const WebString& message, const WebString& state)
{
    m_client->sendDevToolsMessage(sessionId, callId, message, state);
}

void WebSharedWorkerImpl::resumeStartup()
{
    bool isPausedOnStart = m_isPausedOnStart;
    m_isPausedOnStart = false;
    if (isPausedOnStart)
        loadShadowPage();
}

// WorkerReportingProxy --------------------------------------------------------

void WebSharedWorkerImpl::reportException(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL, int exceptionId)
{
    // Not suppported in SharedWorker.
}

void WebSharedWorkerImpl::reportConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage>)
{
    // Not supported in SharedWorker.
}

void WebSharedWorkerImpl::postMessageToPageInspector(const String& message)
{
    m_mainFrame->frame()->document()->postInspectorTask(BLINK_FROM_HERE, createCrossThreadTask(&WebSharedWorkerImpl::postMessageToPageInspectorOnMainThread, this, message));
}

void WebSharedWorkerImpl::postMessageToPageInspectorOnMainThread(const String& message)
{
    m_workerInspectorProxy->dispatchMessageFromWorker(message);
}

void WebSharedWorkerImpl::workerGlobalScopeClosed()
{
    Platform::current()->mainThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&WebSharedWorkerImpl::workerGlobalScopeClosedOnMainThread, AllowCrossThreadAccess(this)));
}

void WebSharedWorkerImpl::workerGlobalScopeClosedOnMainThread()
{
    m_client->workerContextClosed();

    terminateWorkerThread();
}

void WebSharedWorkerImpl::workerGlobalScopeStarted(WorkerGlobalScope*)
{
}

void WebSharedWorkerImpl::workerThreadTerminated()
{
    Platform::current()->mainThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&WebSharedWorkerImpl::workerThreadTerminatedOnMainThread, AllowCrossThreadAccess(this)));
}

void WebSharedWorkerImpl::workerThreadTerminatedOnMainThread()
{
    m_client->workerContextDestroyed();
    // The lifetime of this proxy is controlled by the worker context.
    delete this;
}

// WorkerLoaderProxyProvider -----------------------------------------------------------

void WebSharedWorkerImpl::postTaskToLoader(PassOwnPtr<ExecutionContextTask> task)
{
    m_mainFrame->frame()->document()->postTask(BLINK_FROM_HERE, task);
}

bool WebSharedWorkerImpl::postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask> task)
{
    m_workerThread->postTask(BLINK_FROM_HERE, task);
    return true;
}

void WebSharedWorkerImpl::connect(WebMessagePortChannel* webChannel)
{
    workerThread()->postTask(
        BLINK_FROM_HERE, createCrossThreadTask(&connectTask, adoptPtr(webChannel)));
}

void WebSharedWorkerImpl::connectTask(PassOwnPtr<WebMessagePortChannel> channel, ExecutionContext* context)
{
    // Wrap the passed-in channel in a MessagePort, and send it off via a connect event.
    MessagePort* port = MessagePort::create(*context);
    port->entangle(channel);
    WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
    ASSERT_WITH_SECURITY_IMPLICATION(workerGlobalScope->isSharedWorkerGlobalScope());
    workerGlobalScope->dispatchEvent(createConnectEvent(port));
}

void WebSharedWorkerImpl::startWorkerContext(const WebURL& url, const WebString& name, const WebString& contentSecurityPolicy, WebContentSecurityPolicyType policyType, WebAddressSpace creationAddressSpace)
{
    m_url = url;
    m_name = name;
    m_creationAddressSpace = creationAddressSpace;
    initializeLoader();
}

void WebSharedWorkerImpl::didReceiveScriptLoaderResponse()
{
    InspectorInstrumentation::didReceiveScriptResponse(m_loadingDocument.get(), m_mainScriptLoader->identifier());
    m_client->selectAppCacheID(m_mainScriptLoader->appCacheID());
}

void WebSharedWorkerImpl::onScriptLoaderFinished()
{
    ASSERT(m_loadingDocument);
    ASSERT(m_mainScriptLoader);
    if (m_askedToTerminate)
        return;
    if (m_mainScriptLoader->failed()) {
        m_mainScriptLoader->cancel();
        m_client->workerScriptLoadFailed();

        // The SharedWorker was unable to load the initial script, so
        // shut it down right here.
        delete this;
        return;
    }

    Document* document = m_mainFrame->frame()->document();
    // FIXME: this document's origin is pristine and without any extra privileges. (crbug.com/254993)
    SecurityOrigin* starterOrigin = document->getSecurityOrigin();

    OwnPtrWillBeRawPtr<WorkerClients> workerClients = WorkerClients::create();
    provideLocalFileSystemToWorker(workerClients.get(), LocalFileSystemClient::create());
    WebSecurityOrigin webSecurityOrigin(m_loadingDocument->getSecurityOrigin());
    provideContentSettingsClientToWorker(workerClients.get(), adoptPtr(m_client->createWorkerContentSettingsClientProxy(webSecurityOrigin)));
    RefPtrWillBeRawPtr<ContentSecurityPolicy> contentSecurityPolicy = m_mainScriptLoader->releaseContentSecurityPolicy();
    WorkerThreadStartMode startMode = m_workerInspectorProxy->workerStartMode(document);
    OwnPtr<WorkerThreadStartupData> startupData = WorkerThreadStartupData::create(
        m_url,
        m_loadingDocument->userAgent(),
        m_mainScriptLoader->script(),
        nullptr,
        startMode,
        contentSecurityPolicy ? contentSecurityPolicy->headers() : nullptr,
        starterOrigin,
        workerClients.release(),
        m_mainScriptLoader->responseAddressSpace());
    m_loaderProxy = WorkerLoaderProxy::create(this);
    m_workerThread = SharedWorkerThread::create(m_name, m_loaderProxy, *this);
    InspectorInstrumentation::scriptImported(m_loadingDocument.get(), m_mainScriptLoader->identifier(), m_mainScriptLoader->script());
    m_mainScriptLoader.clear();

    workerThread()->start(startupData.release());
    m_workerInspectorProxy->workerThreadCreated(m_loadingDocument.get(), workerThread(), m_url);
    m_client->workerScriptLoaded();
}

void WebSharedWorkerImpl::terminateWorkerContext()
{
    terminateWorkerThread();
}

void WebSharedWorkerImpl::pauseWorkerContextOnStart()
{
    m_pauseWorkerContextOnStart = true;
}

void WebSharedWorkerImpl::attachDevTools(const WebString& hostId, int sessionId)
{
    WebDevToolsAgent* devtoolsAgent = m_mainFrame->devToolsAgent();
    if (devtoolsAgent)
        devtoolsAgent->attach(hostId, sessionId);
}

void WebSharedWorkerImpl::reattachDevTools(const WebString& hostId, int sessionId, const WebString& savedState)
{
    WebDevToolsAgent* devtoolsAgent = m_mainFrame->devToolsAgent();
    if (devtoolsAgent)
        devtoolsAgent->reattach(hostId, sessionId, savedState);
    resumeStartup();
}

void WebSharedWorkerImpl::detachDevTools()
{
    WebDevToolsAgent* devtoolsAgent = m_mainFrame->devToolsAgent();
    if (devtoolsAgent)
        devtoolsAgent->detach();
}

void WebSharedWorkerImpl::dispatchDevToolsMessage(int sessionId, const WebString& message)
{
    if (m_askedToTerminate)
        return;
    WebDevToolsAgent* devtoolsAgent = m_mainFrame->devToolsAgent();
    if (devtoolsAgent)
        devtoolsAgent->dispatchOnInspectorBackend(sessionId, message);
}

WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client)
{
    return new WebSharedWorkerImpl(client);
}

} // namespace blink