Beispiel #1
0
void ImageLoader::updateFromElement()
{
    // If we're not making renderers for the page, then don't load images.  We don't want to slow
    // down the raw HTML parsing case by loading images we don't intend to display.
    Document* document = m_element->document();
    if (!document->renderer())
        return;

    AtomicString attr = m_element->imageSourceURL();

    if (attr == m_failedLoadURL)
        return;

    // Do not load any image if the 'src' attribute is missing or if it is
    // an empty string.
    CachedResourceHandle<CachedImage> newImage = 0;
    if (!attr.isNull() && !stripLeadingAndTrailingHTMLSpaces(attr).isEmpty()) {
        CachedResourceRequest request(ResourceRequest(document->completeURL(sourceURI(attr))));
        request.setInitiator(element());

        String crossOriginMode = m_element->fastGetAttribute(HTMLNames::crossoriginAttr);
        if (!crossOriginMode.isNull()) {
            StoredCredentials allowCredentials = equalIgnoringCase(crossOriginMode, "use-credentials") ? AllowStoredCredentials : DoNotAllowStoredCredentials;
            updateRequestForAccessControl(request.mutableResourceRequest(), document->securityOrigin(), allowCredentials);
        }

        if (m_loadManually) {
            bool autoLoadOtherImages = document->cachedResourceLoader()->autoLoadImages();
            document->cachedResourceLoader()->setAutoLoadImages(false);
            newImage = new CachedImage(request.resourceRequest());
            newImage->setLoading(true);
            newImage->setOwningCachedResourceLoader(document->cachedResourceLoader());
            document->cachedResourceLoader()->m_documentResources.set(newImage->url(), newImage.get());
            document->cachedResourceLoader()->setAutoLoadImages(autoLoadOtherImages);
        } else
            newImage = document->cachedResourceLoader()->requestImage(request);

        // If we do not have an image here, it means that a cross-site
        // violation occurred, or that the image was blocked via Content
        // Security Policy, or the page is being dismissed. Trigger an
        // error event if the page is not being dismissed.
        if (!newImage && !pageIsBeingDismissed(document)) {
            m_failedLoadURL = attr;
            m_hasPendingErrorEvent = true;
            errorEventSender().dispatchEventSoon(this);
        } else
            clearFailedLoadURL();
    } else if (!attr.isNull()) {
        // Fire an error event if the url is empty.
        // FIXME: Should we fire this event asynchronoulsy via errorEventSender()?
        m_element->dispatchEvent(Event::create(eventNames().errorEvent, false, false));
    }
    
    CachedImage* oldImage = m_image.get();
    if (newImage != oldImage) {
        if (m_hasPendingBeforeLoadEvent) {
            beforeLoadEventSender().cancelEvent(this);
            m_hasPendingBeforeLoadEvent = false;
        }
        if (m_hasPendingLoadEvent) {
            loadEventSender().cancelEvent(this);
            m_hasPendingLoadEvent = false;
        }

        // Cancel error events that belong to the previous load, which is now cancelled by changing the src attribute.
        // If newImage is null and m_hasPendingErrorEvent is true, we know the error event has been just posted by
        // this load and we should not cancel the event.
        // FIXME: If both previous load and this one got blocked with an error, we can receive one error event instead of two.
        if (m_hasPendingErrorEvent && newImage) {
            errorEventSender().cancelEvent(this);
            m_hasPendingErrorEvent = false;
        }

        m_image = newImage;
        m_hasPendingBeforeLoadEvent = !m_element->document()->isImageDocument() && newImage;
        m_hasPendingLoadEvent = newImage;
        m_imageComplete = !newImage;

        if (newImage) {
            if (!m_element->document()->isImageDocument()) {
                if (!m_element->document()->hasListenerType(Document::BEFORELOAD_LISTENER))
                    dispatchPendingBeforeLoadEvent();
                else
                    beforeLoadEventSender().dispatchEventSoon(this);
            } else
                updateRenderer();

            // If newImage is cached, addClient() will result in the load event
            // being queued to fire. Ensure this happens after beforeload is
            // dispatched.
            newImage->addClient(this);
        }
        if (oldImage)
            oldImage->removeClient(this);
    }

    if (RenderImageResource* imageResource = renderImageResource())
        imageResource->resetAnimation();

    // Only consider updating the protection ref-count of the Element immediately before returning
    // from this function as doing so might result in the destruction of this ImageLoader.
    updatedHasPendingEvent();
}
void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, UpdateFromElementBehavior updateBehavior)
{
    // FIXME: According to
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#the-img-element:the-img-element-55
    // When "update image" is called due to environment changes and the load fails, onerror should not be called.
    // That is currently not the case.
    //
    // We don't need to call clearLoader here: Either we were called from the
    // task, or our caller updateFromElement cleared the task's loader (and set
    // m_pendingTask to null).
    m_pendingTask.clear();
    // Make sure to only decrement the count when we exit this function
    OwnPtr<IncrementLoadEventDelayCount> loadDelayCounter;
    loadDelayCounter.swap(m_loadDelayCounter);

    Document& document = m_element->document();
    if (!document.isActive())
        return;

    AtomicString imageSourceURL = m_element->imageSourceURL();
    KURL url = imageSourceToKURL(imageSourceURL);
    ResourcePtr<ImageResource> newImage = 0;
    RefPtrWillBeRawPtr<Element> protectElement(m_element.get());
    if (!url.isNull()) {
        // Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
        ResourceLoaderOptions resourceLoaderOptions = ResourceFetcher::defaultResourceOptions();
        ResourceRequest resourceRequest(url);
        resourceRequest.setFetchCredentialsMode(WebURLRequest::FetchCredentialsModeSameOrigin);
        if (updateBehavior == UpdateForcedReload) {
            resourceRequest.setCachePolicy(ResourceRequestCachePolicy::ReloadBypassingCache);
            // ImageLoader defers the load of images when in an ImageDocument. Don't defer this load on a forced reload.
            m_loadingImageDocument = false;
        }
        if (isHTMLPictureElement(element()->parentNode()) || !element()->fastGetAttribute(HTMLNames::srcsetAttr).isNull())
            resourceRequest.setRequestContext(WebURLRequest::RequestContextImageSet);
        FetchRequest request(resourceRequest, element()->localName(), resourceLoaderOptions);
        configureRequest(request, bypassBehavior, *m_element, document.clientHintsPreferences());

        // Prevent the immediate creation of a ResourceLoader (and therefore a network
        // request) for ImageDocument loads. In this case, the image contents have already
        // been requested as a main resource and ImageDocumentParser will take care of
        // funneling the main resource bytes into the ImageResource.
        if (m_loadingImageDocument) {
            request.setDefer(FetchRequest::DeferredByClient);
            request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);
        }

        newImage = ImageResource::fetch(request, document.fetcher());
        if (m_loadingImageDocument && newImage)
            newImage->setLoading(true);

        if (!newImage && !pageIsBeingDismissed(&document)) {
            crossSiteOrCSPViolationOccurred(imageSourceURL);
            dispatchErrorEvent();
        } else {
            clearFailedLoadURL();
        }
    } else {
        if (!imageSourceURL.isNull()) {
            // Fire an error event if the url string is not empty, but the KURL is.
            dispatchErrorEvent();
        }
        noImageResourceToLoad();
    }

    ImageResource* oldImage = m_image.get();
    if (updateBehavior == UpdateSizeChanged && m_element->layoutObject() && m_element->layoutObject()->isImage() && newImage == oldImage) {
        toLayoutImage(m_element->layoutObject())->intrinsicSizeChanged();
    } else {
        if (newImage != oldImage)
            sourceImageChanged();

        if (m_hasPendingLoadEvent) {
            loadEventSender().cancelEvent(this);
            m_hasPendingLoadEvent = false;
        }

        // Cancel error events that belong to the previous load, which is now cancelled by changing the src attribute.
        // If newImage is null and m_hasPendingErrorEvent is true, we know the error event has been just posted by
        // this load and we should not cancel the event.
        // FIXME: If both previous load and this one got blocked with an error, we can receive one error event instead of two.
        if (m_hasPendingErrorEvent && newImage) {
            errorEventSender().cancelEvent(this);
            m_hasPendingErrorEvent = false;
        }

        m_image = newImage;
        m_hasPendingLoadEvent = newImage;
        m_imageComplete = !newImage;

        updateLayoutObject();
        // If newImage exists and is cached, addClient() will result in the load event
        // being queued to fire. Ensure this happens after beforeload is dispatched.
        if (newImage)
            newImage->addClient(this);

        if (oldImage)
            oldImage->removeClient(this);
    }

    if (LayoutImageResource* imageResource = layoutImageResource())
        imageResource->resetAnimation();

    // Only consider updating the protection ref-count of the Element immediately before returning
    // from this function as doing so might result in the destruction of this ImageLoader.
    updatedHasPendingEvent();
}
Beispiel #3
0
void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior,
                                      UpdateFromElementBehavior updateBehavior,
                                      const KURL& url,
                                      ReferrerPolicy referrerPolicy) {
    // FIXME: According to
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#the-img-element:the-img-element-55
    // When "update image" is called due to environment changes and the load
    // fails, onerror should not be called. That is currently not the case.
    //
    // We don't need to call clearLoader here: Either we were called from the
    // task, or our caller updateFromElement cleared the task's loader (and set
    // m_pendingTask to null).
    m_pendingTask.reset();
    // Make sure to only decrement the count when we exit this function
    std::unique_ptr<IncrementLoadEventDelayCount> loadDelayCounter;
    loadDelayCounter.swap(m_loadDelayCounter);

    Document& document = m_element->document();
    if (!document.isActive())
        return;

    AtomicString imageSourceURL = m_element->imageSourceURL();
    ImageResource* newImage = nullptr;
    if (!url.isNull()) {
        // Unlike raw <img>, we block mixed content inside of <picture> or
        // <img srcset>.
        ResourceLoaderOptions resourceLoaderOptions =
            ResourceFetcher::defaultResourceOptions();
        ResourceRequest resourceRequest(url);
        if (updateBehavior == UpdateForcedReload) {
            resourceRequest.setCachePolicy(WebCachePolicy::BypassingCache);
            resourceRequest.setLoFiState(WebURLRequest::LoFiOff);
        }

        if (referrerPolicy != ReferrerPolicyDefault) {
            resourceRequest.setHTTPReferrer(SecurityPolicy::generateReferrer(
                                                referrerPolicy, url, document.outgoingReferrer()));
        }

        if (isHTMLPictureElement(element()->parentNode()) ||
                !element()->fastGetAttribute(HTMLNames::srcsetAttr).isNull())
            resourceRequest.setRequestContext(WebURLRequest::RequestContextImageSet);
        FetchRequest request(resourceRequest, element()->localName(),
                             resourceLoaderOptions);
        configureRequest(request, bypassBehavior, *m_element,
                         document.clientHintsPreferences());

        newImage = ImageResource::fetch(request, document.fetcher());

        if (!newImage && !pageIsBeingDismissed(&document)) {
            crossSiteOrCSPViolationOccurred(imageSourceURL);
            dispatchErrorEvent();
        } else {
            clearFailedLoadURL();
        }
    } else {
        if (!imageSourceURL.isNull()) {
            // Fire an error event if the url string is not empty, but the KURL is.
            dispatchErrorEvent();
        }
        noImageResourceToLoad();
    }

    ImageResource* oldImage = m_image.get();
    if (updateBehavior == UpdateSizeChanged && m_element->layoutObject() &&
            m_element->layoutObject()->isImage() && newImage == oldImage) {
        toLayoutImage(m_element->layoutObject())->intrinsicSizeChanged();
    } else {
        if (m_hasPendingLoadEvent) {
            loadEventSender().cancelEvent(this);
            m_hasPendingLoadEvent = false;
        }

        // Cancel error events that belong to the previous load, which is now
        // cancelled by changing the src attribute. If newImage is null and
        // m_hasPendingErrorEvent is true, we know the error event has been just
        // posted by this load and we should not cancel the event.
        // FIXME: If both previous load and this one got blocked with an error, we
        // can receive one error event instead of two.
        if (m_hasPendingErrorEvent && newImage) {
            errorEventSender().cancelEvent(this);
            m_hasPendingErrorEvent = false;
        }

        m_image = newImage;
        m_hasPendingLoadEvent = newImage;
        m_imageComplete = !newImage;

        updateLayoutObject();
        // If newImage exists and is cached, addObserver() will result in the load
        // event being queued to fire. Ensure this happens after beforeload is
        // dispatched.
        if (newImage) {
            newImage->addObserver(this);
        }
        if (oldImage) {
            oldImage->removeObserver(this);
        }
    }

    if (LayoutImageResource* imageResource = layoutImageResource())
        imageResource->resetAnimation();

    // Only consider updating the protection ref-count of the Element immediately
    // before returning from this function as doing so might result in the
    // destruction of this ImageLoader.
    updatedHasPendingEvent();
}
Beispiel #4
0
void ImageLoader::doUpdateFromElement(UpdateFromElementBehavior updateBehavior)
{
    // FIXME: According to
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#the-img-element:the-img-element-55
    // When "update image" is called due to environment changes and the load fails, onerror should not be called.
    // That is currently not the case.
    //
    // We don't need to call clearLoader here: Either we were called from the
    // task, or our caller updateFromElement cleared the task's loader (and set
    // m_pendingTask to null).
    m_pendingTask.clear();
    // Make sure to only decrement the count when we exit this function
    OwnPtr<IncrementLoadEventDelayCount> loadDelayCounter;
    loadDelayCounter.swap(m_loadDelayCounter);

    Document& document = m_element->document();
    if (!document.isActive())
        return;

    AtomicString imageSourceURL = m_element->imageSourceURL();
    KURL url = imageSourceToKURL(imageSourceURL);
    ResourcePtr<ImageResource> newImage = 0;
    if (!url.isNull()) {
        // Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
        ResourceLoaderOptions resourceLoaderOptions = ResourceFetcher::defaultResourceOptions();
        ResourceRequest resourceRequest(url);
        FetchRequest request(ResourceRequest(url), element()->localName(), resourceLoaderOptions);

        newImage = document.fetcher()->fetchImage(request);

        if (!newImage && !pageIsBeingDismissed(&document))
            crossSiteOrCSPViolationOccured(imageSourceURL);
        else
            clearFailedLoadURL();
    } else if (!imageSourceURL.isNull()) {
        // Fire an error event if the url string is not empty, but the KURL is.
        m_hasPendingErrorEvent = true;
        errorEventSender().dispatchEventSoon(this);
    }

    ImageResource* oldImage = m_image.get();
    if (newImage != oldImage) {
        sourceImageChanged();

        if (m_hasPendingLoadEvent) {
            loadEventSender().cancelEvent(this);
            m_hasPendingLoadEvent = false;
        }

        // Cancel error events that belong to the previous load, which is now cancelled by changing the src attribute.
        // If newImage is null and m_hasPendingErrorEvent is true, we know the error event has been just posted by
        // this load and we should not cancel the event.
        // FIXME: If both previous load and this one got blocked with an error, we can receive one error event instead of two.
        if (m_hasPendingErrorEvent && newImage) {
            errorEventSender().cancelEvent(this);
            m_hasPendingErrorEvent = false;
        }

        m_image = newImage;
        m_hasPendingLoadEvent = newImage;
        m_imageComplete = !newImage;

        updateRenderer();
        // If newImage exists and is cached, addClient() will result in the load event
        // being queued to fire. Ensure this happens after beforeload is dispatched.
        if (newImage)
            newImage->addClient(this);

        if (oldImage)
            oldImage->removeClient(this);
    } else if (updateBehavior == UpdateSizeChanged && m_element->renderer() && m_element->renderer()->isImage()) {
        toRenderImage(m_element->renderer())->intrinsicSizeChanged();
    }

    if (RenderImageResource* imageResource = renderImageResource())
        imageResource->resetAnimation();

    // Only consider updating the protection ref-count of the Element immediately before returning
    // from this function as doing so might result in the destruction of this ImageLoader.
    updatedHasPendingEvent();
}