Source/WebKitLegacy/win/WebDownloadCFNet.cpp

/*
 * Copyright (C) 2007, 2015 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:
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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#include "WebKitDLL.h"
#include "WebDownload.h"

#include "DefaultDownloadDelegate.h"
#include "MarshallingHelpers.h"
#include "NetworkStorageSessionMap.h"
#include "WebError.h"
#include "WebKit.h"
#include "WebKitLogging.h"
#include "WebMutableURLRequest.h"
#include "WebURLAuthenticationChallenge.h"
#include "WebURLCredential.h"
#include "WebURLResponse.h"

#include <wtf/text/CString.h>

#include <io.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <WebCore/AuthenticationCF.h>
#include <WebCore/BString.h>
#include <WebCore/CredentialStorage.h>
#include <WebCore/DownloadBundle.h>
#include <WebCore/LoaderRunLoopCF.h>
#include <WebCore/NetworkStorageSession.h>
#include <WebCore/ResourceError.h>
#include <WebCore/ResourceHandle.h>
#include <WebCore/ResourceRequest.h>
#include <WebCore/ResourceResponse.h>

using namespace WebCore;

// CFURLDownload Callbacks ----------------------------------------------------------------
static void didStartCallback(CFURLDownloadRef download, const void *clientInfo);
static CFURLRequestRef willSendRequestCallback(CFURLDownloadRef download, CFURLRequestRef request, CFURLResponseRef redirectionResponse, const void *clientInfo);
static void didReceiveAuthenticationChallengeCallback(CFURLDownloadRef download, CFURLAuthChallengeRef challenge, const void *clientInfo);
static void didReceiveResponseCallback(CFURLDownloadRef download, CFURLResponseRef response, const void *clientInfo);
static void willResumeWithResponseCallback(CFURLDownloadRef download, CFURLResponseRef response, UInt64 startingByte, const void *clientInfo);
static void didReceiveDataCallback(CFURLDownloadRef download, CFIndex length, const void *clientInfo);
static Boolean shouldDecodeDataOfMIMETypeCallback(CFURLDownloadRef download, CFStringRef encodingType, const void *clientInfo);
static void decideDestinationWithSuggestedObjectNameCallback(CFURLDownloadRef download, CFStringRef objectName, const void *clientInfo);
static void didCreateDestinationCallback(CFURLDownloadRef download, CFURLRef path, const void *clientInfo);
static void didFinishCallback(CFURLDownloadRef download, const void *clientInfo);
static void didFailCallback(CFURLDownloadRef download, CFErrorRef error, const void *clientInfo);

void WebDownload::init(ResourceHandle* handle, const ResourceRequest& request, const ResourceResponse& response, IWebDownloadDelegate* delegate)
{
    m_delegate = delegate ? delegate : DefaultDownloadDelegate::sharedInstance();
    CFURLConnectionRef connection = handle->connection();
    if (!connection) {
        LOG_ERROR("WebDownload::WebDownload(ResourceHandle*,...) called with an inactive ResourceHandle");    
        return;
    }

    CFURLDownloadClient client = {0, this, 0, 0, 0, didStartCallback, willSendRequestCallback, didReceiveAuthenticationChallengeCallback, 
        didReceiveResponseCallback, willResumeWithResponseCallback, didReceiveDataCallback, shouldDecodeDataOfMIMETypeCallback,
        decideDestinationWithSuggestedObjectNameCallback, didCreateDestinationCallback, didFinishCallback, didFailCallback};

    m_request.adoptRef(WebMutableURLRequest::createInstance(request));
    m_download = adoptCF(CFURLDownloadCreateAndStartWithLoadingConnection(0, connection, request.cfURLRequest(UpdateHTTPBody), response.cfURLResponse(), &client));

    // It is possible for CFURLDownloadCreateAndStartWithLoadingConnection() to fail if the passed in CFURLConnection is not in a "downloadable state"
    // However, we should never hit that case
    if (!m_download) {
        ASSERT_NOT_REACHED();
        LOG_ERROR("WebDownload - Failed to create WebDownload from existing connection (%s)", request.url().string().utf8().data());
    } else
        LOG(Download, "WebDownload - Created WebDownload %p from existing connection (%s)", this, request.url().string().utf8().data());

    // The CFURLDownload either starts successfully and retains the CFURLConnection, 
    // or it fails to creating and we have a now-useless connection with a dangling ref. 
    // Either way, we need to release the connection to balance out ref counts
    handle->releaseConnectionForDownload();
}

void WebDownload::init(const URL& url, IWebDownloadDelegate* delegate)
{
    m_delegate = delegate ? delegate : DefaultDownloadDelegate::sharedInstance();
    LOG_ERROR("Delegate is %p", m_delegate.get());

    ResourceRequest request(url);
    CFURLRequestRef cfRequest = request.cfURLRequest(UpdateHTTPBody);

    CFURLDownloadClient client = {0, this, 0, 0, 0, didStartCallback, willSendRequestCallback, didReceiveAuthenticationChallengeCallback, 
                                  didReceiveResponseCallback, willResumeWithResponseCallback, didReceiveDataCallback, shouldDecodeDataOfMIMETypeCallback, 
                                  decideDestinationWithSuggestedObjectNameCallback, didCreateDestinationCallback, didFinishCallback, didFailCallback};
    m_request.adoptRef(WebMutableURLRequest::createInstance(request));
    m_download = adoptCF(CFURLDownloadCreate(0, cfRequest, &client));

    CFURLDownloadScheduleWithCurrentMessageQueue(m_download.get());
    CFURLDownloadScheduleDownloadWithRunLoop(m_download.get(), loaderRunLoop(), kCFRunLoopDefaultMode);

    LOG(Download, "WebDownload - Initialized download of url %s in WebDownload %p", url.string().utf8().data(), this);
}

// IWebDownload -------------------------------------------------------------------

HRESULT WebDownload::initWithRequest(_In_opt_ IWebURLRequest* request, _In_opt_ IWebDownloadDelegate* delegate)
{
    COMPtr<WebMutableURLRequest> webRequest;
    if (!request || FAILED(request->QueryInterface(&webRequest))) {
        LOG(Download, "WebDownload - initWithRequest failed - not a WebMutableURLRequest");    
        return E_FAIL;
    }

    if (!delegate)
        return E_FAIL;
    m_delegate = delegate;
    LOG(Download, "Delegate is %p", m_delegate.get());

    RetainPtr<CFURLRequestRef> cfRequest = webRequest->resourceRequest().cfURLRequest(UpdateHTTPBody);

    CFURLDownloadClient client = {0, this, 0, 0, 0, didStartCallback, willSendRequestCallback, didReceiveAuthenticationChallengeCallback, 
                                  didReceiveResponseCallback, willResumeWithResponseCallback, didReceiveDataCallback, shouldDecodeDataOfMIMETypeCallback, 
                                  decideDestinationWithSuggestedObjectNameCallback, didCreateDestinationCallback, didFinishCallback, didFailCallback};
    m_request.adoptRef(WebMutableURLRequest::createInstance(webRequest.get()));
    m_download = adoptCF(CFURLDownloadCreate(0, cfRequest.get(), &client));

    // If for some reason the download failed to create, 
    // we have particular cleanup to do
    if (!m_download) {
        m_request = nullptr;    
        return E_FAIL;
    }

    CFURLDownloadScheduleWithCurrentMessageQueue(m_download.get());
    CFURLDownloadScheduleDownloadWithRunLoop(m_download.get(), loaderRunLoop(), kCFRunLoopDefaultMode);

    LOG(Download, "WebDownload - initWithRequest complete, started download of url %s", webRequest->resourceRequest().url().string().utf8().data());
    return S_OK;
}

HRESULT WebDownload::initToResumeWithBundle(_In_ BSTR bundlePath, _In_opt_ IWebDownloadDelegate* delegate)
{
    LOG(Download, "Attempting resume of download bundle %s", String(bundlePath, SysStringLen(bundlePath)).ascii().data());

    Vector<uint8_t> buffer;
    if (!DownloadBundle::extractResumeData(String(bundlePath, SysStringLen(bundlePath)), buffer))
        return E_FAIL;

    // It is possible by some twist of fate the bundle magic number was naturally at the end of the file and its not actually a valid bundle.
    // That, or someone engineered it that way to try to attack us. In that cause, this CFData will successfully create but when we actually
    // try to start the CFURLDownload using this bogus data, it will fail and we will handle that gracefully.
    auto resumeData = adoptCF(CFDataCreate(0, buffer.data(), buffer.size()));

    if (!delegate)
        return E_FAIL;
    m_delegate = delegate;
    LOG(Download, "Delegate is %p", m_delegate.get());

    CFURLDownloadClient client = {0, this, 0, 0, 0, didStartCallback, willSendRequestCallback, didReceiveAuthenticationChallengeCallback, 
                                  didReceiveResponseCallback, willResumeWithResponseCallback, didReceiveDataCallback, shouldDecodeDataOfMIMETypeCallback, 
                                  decideDestinationWithSuggestedObjectNameCallback, didCreateDestinationCallback, didFinishCallback, didFailCallback};
    
    auto pathURL = MarshallingHelpers::PathStringToFileCFURLRef(String(bundlePath, SysStringLen(bundlePath)));
    ASSERT(pathURL);

    m_download = adoptCF(CFURLDownloadCreateWithResumeData(0, resumeData.get(), pathURL.get(), &client));

    if (!m_download) {
        LOG(Download, "Failed to create CFURLDownloadRef for resume");    
        return E_FAIL;
    }
    
    m_bundlePath = String(bundlePath, SysStringLen(bundlePath));
    // Attempt to remove the ".download" extension from the bundle for the final file destination
    // Failing that, we clear m_destination and will ask the delegate later once the download starts
    if (m_bundlePath.endsWithIgnoringASCIICase(DownloadBundle::fileExtension())) {
        m_destination = StringView(m_bundlePath).left(m_destination.length() - DownloadBundle::fileExtension().length()).toString().isolatedCopy();
    } else
        m_destination = String();
    
    CFURLDownloadScheduleWithCurrentMessageQueue(m_download.get());
    CFURLDownloadScheduleDownloadWithRunLoop(m_download.get(), loaderRunLoop(), kCFRunLoopDefaultMode);

    LOG(Download, "WebDownload - initWithRequest complete, resumed download of bundle %s", String(bundlePath, SysStringLen(bundlePath)).ascii().data());
    return S_OK;
}

HRESULT WebDownload::start()
{
    LOG(Download, "WebDownload - Starting download (%p)", this);
    if (!m_download)
        return E_FAIL;

    CFURLDownloadStart(m_download.get());
    // FIXME: 4950477 - CFURLDownload neglects to make the didStart() client call upon starting the download.
    // This is a somewhat critical call, so we'll fake it for now!
    didStart();

    return S_OK;
}

HRESULT WebDownload::cancel()
{
    LOG(Download, "WebDownload - Cancelling download (%p)", this);
    if (!m_download)
        return E_FAIL;

    CFURLDownloadCancel(m_download.get());
    m_download = nullptr;
    return S_OK;
}

HRESULT WebDownload::cancelForResume()
{
    LOG(Download, "WebDownload - Cancelling download (%p), writing resume information to file if possible", this);
    ASSERT(m_download);
    if (!m_download)
        return E_FAIL;

    RetainPtr<CFDataRef> resumeData;
    if (m_destination.isEmpty()) {
        CFURLDownloadCancel(m_download.get());
        m_download = nullptr;
        return S_OK;
    }

    CFURLDownloadSetDeletesUponFailure(m_download.get(), false);
    CFURLDownloadCancel(m_download.get());

    resumeData = adoptCF(CFURLDownloadCopyResumeData(m_download.get()));
    if (!resumeData) {
        LOG(Download, "WebDownload - Unable to create resume data for download (%p)", this);
        m_download = nullptr;
        return S_OK;
    }

    auto* resumeBytes = reinterpret_cast<const uint8_t*>(CFDataGetBytePtr(resumeData.get()));
    uint32_t resumeLength = CFDataGetLength(resumeData.get());
    DownloadBundle::appendResumeData(resumeBytes, resumeLength, m_bundlePath);

    m_download = nullptr;
    return S_OK;
}

HRESULT WebDownload::deletesFileUponFailure(_Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;
    *result = FALSE;
    if (!m_download)
        return E_FAIL;
    *result = CFURLDownloadDeletesUponFailure(m_download.get());
    return S_OK;
}

HRESULT WebDownload::setDeletesFileUponFailure(BOOL deletesFileUponFailure)
{
    if (!m_download)
        return E_FAIL;
    CFURLDownloadSetDeletesUponFailure(m_download.get(), !!deletesFileUponFailure);
    return S_OK;
}

HRESULT WebDownload::setDestination(_In_ BSTR path, BOOL allowOverwrite)
{
    if (!m_download)
        return E_FAIL;

    m_destination = String(path, SysStringLen(path));
    m_bundlePath = m_destination + DownloadBundle::fileExtension();

    auto pathURL = MarshallingHelpers::PathStringToFileCFURLRef(m_bundlePath);
    CFURLDownloadSetDestination(m_download.get(), pathURL.get(), !!allowOverwrite);

    LOG(Download, "WebDownload - Set destination to %s", m_bundlePath.ascii().data());

    return S_OK;
}

// IWebURLAuthenticationChallengeSender -------------------------------------------------------------------

HRESULT WebDownload::cancelAuthenticationChallenge(_In_opt_ IWebURLAuthenticationChallenge*)
{
    if (m_download) {
        CFURLDownloadCancel(m_download.get());
        m_download = nullptr;
    }

    // FIXME: Do we need a URL or description for this error code?
    ResourceError error(String(WebURLErrorDomain), WebURLErrorUserCancelledAuthentication, URL(), emptyString());
    COMPtr<WebError> webError(AdoptCOM, WebError::createInstance(error));
    m_delegate->didFailWithError(this, webError.get());

    return S_OK;
}

HRESULT WebDownload::continueWithoutCredentialForAuthenticationChallenge(_In_opt_ IWebURLAuthenticationChallenge* challenge)
{
    COMPtr<WebURLAuthenticationChallenge> webChallenge(Query, challenge);
    if (!webChallenge)
        return E_NOINTERFACE;

    if (m_download)
        CFURLDownloadUseCredential(m_download.get(), 0, webChallenge->authenticationChallenge().cfURLAuthChallengeRef());
    return S_OK;
}

HRESULT WebDownload::useCredential(_In_opt_ IWebURLCredential* credential, _In_opt_ IWebURLAuthenticationChallenge* challenge)
{
    COMPtr<WebURLAuthenticationChallenge> webChallenge(Query, challenge);
    if (!webChallenge)
        return E_NOINTERFACE;

    COMPtr<WebURLCredential> webCredential(Query, credential);
    if (!webCredential)
        return E_NOINTERFACE;

    auto cfCredential = createCF(webCredential->credential());

    if (m_download)
        CFURLDownloadUseCredential(m_download.get(), cfCredential.get(), webChallenge->authenticationChallenge().cfURLAuthChallengeRef());
    return S_OK;
}

// CFURLDownload Callbacks -------------------------------------------------------------------
void WebDownload::didStart()
{
#ifndef NDEBUG
    m_startTime = m_dataTime = WallTime::now();
    m_received = 0;
    LOG(Download, "DOWNLOAD - Started %p at %.3f seconds", this, m_startTime.secondsSinceEpoch().seconds());
#endif
    if (FAILED(m_delegate->didBegin(this)))
        LOG_ERROR("DownloadDelegate->didBegin failed");
}

CFURLRequestRef WebDownload::willSendRequest(CFURLRequestRef request, CFURLResponseRef response)
{
    COMPtr<WebMutableURLRequest> webRequest(AdoptCOM, WebMutableURLRequest::createInstance(ResourceRequest(request)));
    COMPtr<WebURLResponse> webResponse(AdoptCOM, WebURLResponse::createInstance(ResourceResponse(response)));
    COMPtr<IWebMutableURLRequest> finalRequest;

    if (FAILED(m_delegate->willSendRequest(this, webRequest.get(), webResponse.get(), &finalRequest)))
        LOG_ERROR("DownloadDelegate->willSendRequest failed");
    
    if (!finalRequest)
        return 0;

    COMPtr<WebMutableURLRequest> finalWebRequest(AdoptCOM, WebMutableURLRequest::createInstance(finalRequest.get()));
    m_request = finalWebRequest.get();
    return retainPtr(finalWebRequest->resourceRequest().cfURLRequest(UpdateHTTPBody)).leakRef();
}

void WebDownload::didReceiveAuthenticationChallenge(CFURLAuthChallengeRef challenge)
{
    // Try previously stored credential first.
    if (!CFURLAuthChallengeGetPreviousFailureCount(challenge)) {
        Credential credential = NetworkStorageSessionMap::defaultStorageSession().credentialStorage().get(emptyString(), core(CFURLAuthChallengeGetProtectionSpace(challenge)));
        if (!credential.isEmpty()) {
            auto cfCredential = createCF(credential);
            CFURLDownloadUseCredential(m_download.get(), cfCredential.get(), challenge);
            return;
        }
    }

    COMPtr<IWebURLAuthenticationChallenge> webChallenge(AdoptCOM,
        WebURLAuthenticationChallenge::createInstance(AuthenticationChallenge(challenge, 0), this));

    if (SUCCEEDED(m_delegate->didReceiveAuthenticationChallenge(this, webChallenge.get())))
        return;

    cancelAuthenticationChallenge(webChallenge.get());
}

void WebDownload::didReceiveResponse(CFURLResponseRef response)
{
    COMPtr<WebURLResponse> webResponse(AdoptCOM, WebURLResponse::createInstance(ResourceResponse(response)));
    if (FAILED(m_delegate->didReceiveResponse(this, webResponse.get())))
        LOG_ERROR("DownloadDelegate->didReceiveResponse failed");
}

void WebDownload::willResumeWithResponse(CFURLResponseRef response, UInt64 fromByte)
{
    COMPtr<WebURLResponse> webResponse(AdoptCOM, WebURLResponse::createInstance(ResourceResponse(response)));
    if (FAILED(m_delegate->willResumeWithResponse(this, webResponse.get(), fromByte)))
        LOG_ERROR("DownloadDelegate->willResumeWithResponse failed");
}

void WebDownload::didReceiveData(CFIndex length)
{
#ifndef NDEBUG
    m_received += length;
    WallTime current = WallTime::now();
    if ((current - m_dataTime) > 2_s)
        LOG(Download, "DOWNLOAD - %p hanged for %.3f seconds - Received %i bytes for a total of %i", this, (current - m_dataTime).seconds(), length, m_received);
    m_dataTime = current;
#endif
    if (FAILED(m_delegate->didReceiveDataOfLength(this, length)))
        LOG_ERROR("DownloadDelegate->didReceiveData failed");
}

bool WebDownload::shouldDecodeDataOfMIMEType(CFStringRef mimeType)
{
    BOOL result;
    if (FAILED(m_delegate->shouldDecodeSourceDataOfMIMEType(this, BString(mimeType), &result))) {
        LOG_ERROR("DownloadDelegate->shouldDecodeSourceDataOfMIMEType failed");
        return false;
    }
    return !!result;
}

void WebDownload::decideDestinationWithSuggestedObjectName(CFStringRef name)
{    
    if (FAILED(m_delegate->decideDestinationWithSuggestedFilename(this, BString(name))))
        LOG_ERROR("DownloadDelegate->decideDestinationWithSuggestedObjectName failed");
}

void WebDownload::didCreateDestination(CFURLRef destination)
{
    // The concept of the ".download bundle" is internal to the WebDownload, so therefore
    // we try to mask the delegate from its existence as much as possible by telling it the final
    // destination was created, when in reality the bundle was created

    String createdDestination = MarshallingHelpers::FileCFURLRefToPathString(destination);

    // At this point in receiving CFURLDownload callbacks, we should definitely have the bundle path stored locally
    // and it should match with the file that CFURLDownload created
    ASSERT(createdDestination == m_bundlePath);
    // And we should also always have the final-destination stored
    ASSERT(!m_destination.isEmpty());

    BString path(m_destination);
    if (FAILED(m_delegate->didCreateDestination(this, path)))
        LOG_ERROR("DownloadDelegate->didCreateDestination failed");
}

void WebDownload::didFinish()
{
#ifndef NDEBUG
    LOG(Download, "DOWNLOAD - Finished %p after %i bytes and %.3f seconds", this, m_received, (WallTime::now() - m_startTime).seconds());
#endif

    ASSERT(!m_bundlePath.isEmpty() && !m_destination.isEmpty());
    LOG(Download, "WebDownload - Moving file from bundle %s to destination %s", m_bundlePath.ascii().data(), m_destination.ascii().data());

    // We try to rename the bundle to the final file name.  If that fails, we give the delegate one more chance to chose
    // the final file name, then we just leave it
    if (!MoveFileEx(m_bundlePath.wideCharacters().data(), m_destination.wideCharacters().data(), 0)) {
        LOG_ERROR("Failed to move bundle %s to %s on completion\nError - %i", m_bundlePath.ascii().data(), m_destination.ascii().data(), GetLastError());
        
        bool reportBundlePathAsFinalPath = true;

        BString destinationBSTR(m_destination);
        if (FAILED(m_delegate->decideDestinationWithSuggestedFilename(this, destinationBSTR)))
            LOG_ERROR("delegate->decideDestinationWithSuggestedFilename() failed");

        // The call to m_delegate->decideDestinationWithSuggestedFilename() should have changed our destination, so we'll try the move
        // one last time.
        if (!m_destination.isEmpty())
            if (MoveFileEx(m_bundlePath.wideCharacters().data(), m_destination.wideCharacters().data(), 0))
                reportBundlePathAsFinalPath = false;

        // We either need to tell the delegate our final filename is the bundle filename, or is the file name they just told us to use
        if (reportBundlePathAsFinalPath) {
            BString bundleBSTR(m_bundlePath);
            m_delegate->didCreateDestination(this, bundleBSTR);
        } else {
            BString finalDestinationBSTR = BString(m_destination);
            m_delegate->didCreateDestination(this, finalDestinationBSTR);
        }
    }

    // It's extremely likely the call to delegate->didFinish() will deref this, so lets not let that cause our destruction just yet
    COMPtr<WebDownload> protect = this;
    if (FAILED(m_delegate->didFinish(this)))
        LOG_ERROR("DownloadDelegate->didFinish failed");

    m_download = 0;
}

void WebDownload::didFail(CFErrorRef error)
{
    COMPtr<WebError> webError(AdoptCOM, WebError::createInstance(ResourceError(error)));
    if (FAILED(m_delegate->didFailWithError(this, webError.get())))
        LOG_ERROR("DownloadDelegate->didFailWithError failed");
}

// CFURLDownload Callbacks ----------------------------------------------------------------
void didStartCallback(CFURLDownloadRef, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didStart(); }

CFURLRequestRef willSendRequestCallback(CFURLDownloadRef, CFURLRequestRef request, CFURLResponseRef redirectionResponse, const void *clientInfo)
{ return ((WebDownload*)clientInfo)->willSendRequest(request, redirectionResponse); }

void didReceiveAuthenticationChallengeCallback(CFURLDownloadRef, CFURLAuthChallengeRef challenge, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didReceiveAuthenticationChallenge(challenge); }

void didReceiveResponseCallback(CFURLDownloadRef, CFURLResponseRef response, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didReceiveResponse(response); }

void willResumeWithResponseCallback(CFURLDownloadRef, CFURLResponseRef response, UInt64 startingByte, const void *clientInfo)
{ ((WebDownload*)clientInfo)->willResumeWithResponse(response, startingByte); }

void didReceiveDataCallback(CFURLDownloadRef, CFIndex length, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didReceiveData(length); }

Boolean shouldDecodeDataOfMIMETypeCallback(CFURLDownloadRef, CFStringRef encodingType, const void *clientInfo)
{ return ((WebDownload*)clientInfo)->shouldDecodeDataOfMIMEType(encodingType); }

void decideDestinationWithSuggestedObjectNameCallback(CFURLDownloadRef, CFStringRef objectName, const void *clientInfo)
{ ((WebDownload*)clientInfo)->decideDestinationWithSuggestedObjectName(objectName); }

void didCreateDestinationCallback(CFURLDownloadRef, CFURLRef path, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didCreateDestination(path); }

void didFinishCallback(CFURLDownloadRef, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didFinish(); }

void didFailCallback(CFURLDownloadRef, CFErrorRef error, const void *clientInfo)
{ ((WebDownload*)clientInfo)->didFail(error); }