/*
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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.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#include "config.h"
#include "WorkerThreadableLoader.h"

#include "ContentSecurityPolicy.h"
#include "Document.h"
#include "DocumentThreadableLoader.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "SecurityOrigin.h"
#include "ThreadableLoader.h"
#include "WorkerGlobalScope.h"
#include "WorkerLoaderProxy.h"
#include "WorkerThread.h"
#include <wtf/MainThread.h>
#include <wtf/Vector.h>

namespace WebCore {

static const char loadResourceSynchronouslyMode[] = "loadResourceSynchronouslyMode";

WorkerThreadableLoader::WorkerThreadableLoader(WorkerGlobalScope* workerGlobalScope, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, const ThreadableLoaderOptions& options)
    : m_workerGlobalScope(workerGlobalScope)
    , m_workerClientWrapper(ThreadableLoaderClientWrapper::create(client))
    , m_bridge(*(new MainThreadBridge(m_workerClientWrapper, workerGlobalScope->thread().workerLoaderProxy(), taskMode, request, options, workerGlobalScope->url().strippedForUseAsReferrer(), workerGlobalScope->securityOrigin(), workerGlobalScope->contentSecurityPolicy())))
{
}

WorkerThreadableLoader::~WorkerThreadableLoader()
{
    m_bridge.destroy();
}

void WorkerThreadableLoader::loadResourceSynchronously(WorkerGlobalScope* workerGlobalScope, const ResourceRequest& request, ThreadableLoaderClient& client, const ThreadableLoaderOptions& options)
{
    WorkerRunLoop& runLoop = workerGlobalScope->thread().runLoop();

    // Create a unique mode just for this synchronous resource load.
    String mode = loadResourceSynchronouslyMode;
    mode.append(String::number(runLoop.createUniqueId()));

    RefPtr<WorkerThreadableLoader> loader = WorkerThreadableLoader::create(workerGlobalScope, &client, mode, request, options);
    MessageQueueWaitResult result = MessageQueueMessageReceived;
    while (!loader->done() && result != MessageQueueTerminated)
        result = runLoop.runInMode(workerGlobalScope, mode);

    if (!loader->done() && result == MessageQueueTerminated)
        loader->cancel();
}

void WorkerThreadableLoader::cancel()
{
    m_bridge.cancel();
}

WorkerThreadableLoader::MainThreadBridge::MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, WorkerLoaderProxy& loaderProxy, const String& taskMode,
    const ResourceRequest& request, const ThreadableLoaderOptions& options, const String& outgoingReferrer,
    const SecurityOrigin* securityOrigin, const ContentSecurityPolicy* contentSecurityPolicy)
    : m_workerClientWrapper(workerClientWrapper)
    , m_loaderProxy(loaderProxy)
    , m_taskMode(taskMode.isolatedCopy())
{
    ASSERT(m_workerClientWrapper.get());

    auto* requestData = request.copyData().release();
    auto* optionsCopy = options.isolatedCopy().release();

    ASSERT(securityOrigin);
    ASSERT(contentSecurityPolicy);

    auto* contentSecurityPolicyCopy = std::make_unique<ContentSecurityPolicy>(securityOrigin->isolatedCopy()).release();
    contentSecurityPolicyCopy->copyStateFrom(contentSecurityPolicy);

    StringCapture capturedOutgoingReferrer(outgoingReferrer);
    m_loaderProxy.postTaskToLoader([this, requestData, optionsCopy, contentSecurityPolicyCopy, capturedOutgoingReferrer](ScriptExecutionContext& context) {
        ASSERT(isMainThread());
        Document& document = downcast<Document>(context);

        auto request = ResourceRequest::adopt(std::unique_ptr<CrossThreadResourceRequestData>(requestData));
        request->setHTTPReferrer(capturedOutgoingReferrer.string());

        auto options = std::unique_ptr<ThreadableLoaderOptions>(optionsCopy);

        // FIXME: If the a site requests a local resource, then this will return a non-zero value but the sync path
        // will return a 0 value. Either this should return 0 or the other code path should do a callback with
        // a failure.
        m_mainThreadLoader = DocumentThreadableLoader::create(document, *this, *request, *options, std::unique_ptr<ContentSecurityPolicy>(contentSecurityPolicyCopy));
        ASSERT(m_mainThreadLoader);
    });
}

void WorkerThreadableLoader::MainThreadBridge::destroy()
{
    // Ensure that no more client callbacks are done in the worker context's thread.
    clearClientWrapper();

    // "delete this" and m_mainThreadLoader::deref() on the worker object's thread.
    m_loaderProxy.postTaskToLoader([this] (ScriptExecutionContext& context) {
        ASSERT(isMainThread());
        ASSERT_UNUSED(context, context.isDocument());
        delete this;
    });
}

void WorkerThreadableLoader::MainThreadBridge::cancel()
{
    m_loaderProxy.postTaskToLoader([this] (ScriptExecutionContext& context) {
        ASSERT(isMainThread());
        ASSERT_UNUSED(context, context.isDocument());

        if (!m_mainThreadLoader)
            return;
        m_mainThreadLoader->cancel();
        m_mainThreadLoader = nullptr;
    });

    ThreadableLoaderClientWrapper* clientWrapper = m_workerClientWrapper.get();
    if (!clientWrapper->done()) {
        // If the client hasn't reached a termination state, then transition it by sending a cancellation error.
        // Note: no more client callbacks will be done after this method -- the clearClientWrapper() call ensures that.
        ResourceError error(String(), 0, URL(), String());
        error.setIsCancellation(true);
        clientWrapper->didFail(error);
    }
    clearClientWrapper();
}

void WorkerThreadableLoader::MainThreadBridge::clearClientWrapper()
{
    m_workerClientWrapper->clearClient();
}

void WorkerThreadableLoader::MainThreadBridge::didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, bytesSent, totalBytesToBeSent] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didSendData(bytesSent, totalBytesToBeSent);
    }, m_taskMode);
}

void WorkerThreadableLoader::MainThreadBridge::didReceiveResponse(unsigned long identifier, const ResourceResponse& response)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    auto* responseData = response.copyData().release();
    if (!m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, identifier, responseData] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        auto response(ResourceResponse::adopt(std::unique_ptr<CrossThreadResourceResponseData>(responseData)));
        workerClientWrapper->didReceiveResponse(identifier, *response);
    }, m_taskMode))
        delete responseData;
}

void WorkerThreadableLoader::MainThreadBridge::didReceiveData(const char* data, int dataLength)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    Vector<char>* vectorPtr = new Vector<char>(dataLength);
    memcpy(vectorPtr->data(), data, dataLength);
    if (!m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, vectorPtr] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didReceiveData(vectorPtr->data(), vectorPtr->size());
        delete vectorPtr;
    }, m_taskMode))
        delete vectorPtr;
}

void WorkerThreadableLoader::MainThreadBridge::didFinishLoading(unsigned long identifier, double finishTime)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, identifier, finishTime] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didFinishLoading(identifier, finishTime);
    }, m_taskMode);
}

void WorkerThreadableLoader::MainThreadBridge::didFail(const ResourceError& error)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    ResourceError* capturedError = new ResourceError(error.copy());
    if (!m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, capturedError] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didFail(*capturedError);
        delete capturedError;
    }, m_taskMode))
        delete capturedError;
}

void WorkerThreadableLoader::MainThreadBridge::didFailAccessControlCheck(const ResourceError& error)
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    ResourceError* capturedError = new ResourceError(error.copy());
    if (!m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper, capturedError] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didFailAccessControlCheck(*capturedError);
        delete capturedError;
    }, m_taskMode))
        delete capturedError;
}

void WorkerThreadableLoader::MainThreadBridge::didFailRedirectCheck()
{
    RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper = m_workerClientWrapper;
    m_loaderProxy.postTaskForModeToWorkerGlobalScope([workerClientWrapper] (ScriptExecutionContext& context) {
        ASSERT_UNUSED(context, context.isWorkerGlobalScope());
        workerClientWrapper->didFailRedirectCheck();
    }, m_taskMode);
}

} // namespace WebCore