frameloader.cpp

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    ResourceRequest request(url, referrer, refresh ? ReloadIgnoringCacheData : UseProtocolCachePolicy);
    
    if (executeIfJavaScriptURL(request.url(), userGesture))
        return;

    urlSelected(request, "_self", 0, lockHistory, lockBackForwardList, userGesture);
}

void FrameLoader::urlSelected(const FrameLoadRequest& request, Event* event, bool lockHistory, bool lockBackForwardList)
{
    FrameLoadRequest copy = request;
    if (copy.resourceRequest().httpReferrer().isEmpty())
        copy.resourceRequest().setHTTPReferrer(m_outgoingReferrer);
    addHTTPOriginIfNeeded(copy.resourceRequest(), outgoingOrigin());

    loadFrameRequestWithFormAndValues(copy, lockHistory, lockBackForwardList, event, 0, HashMap<String, String>());
}
    
void FrameLoader::urlSelected(const ResourceRequest& request, const String& _target, Event* triggeringEvent, bool lockHistory, bool lockBackForwardList, bool userGesture)
{
    if (executeIfJavaScriptURL(request.url(), userGesture, false))
        return;

    String target = _target;
    if (target.isEmpty())
        target = m_frame->document()->baseTarget();

    FrameLoadRequest frameRequest(request, target);

    urlSelected(frameRequest, triggeringEvent, lockHistory, lockBackForwardList);
}

bool FrameLoader::requestFrame(HTMLFrameOwnerElement* ownerElement, const String& urlString, const AtomicString& frameName)
{
    // Support for <frame src="javascript:string">
    KURL scriptURL;
    KURL url;
    if (protocolIs(urlString, "javascript")) {
        scriptURL = completeURL(urlString); // completeURL() encodes the URL.
        url = blankURL();
    } else
        url = completeURL(urlString);

    Frame* frame = ownerElement->contentFrame();
    if (frame)
        frame->loader()->scheduleLocationChange(url.string(), m_outgoingReferrer, true, true, userGestureHint());
    else
        frame = loadSubframe(ownerElement, url, frameName, m_outgoingReferrer);
    
    if (!frame)
        return false;

    if (!scriptURL.isEmpty())
        frame->loader()->executeIfJavaScriptURL(scriptURL);

    return true;
}

Frame* FrameLoader::loadSubframe(HTMLFrameOwnerElement* ownerElement, const KURL& url, const String& name, const String& referrer)
{
    bool allowsScrolling = true;
    int marginWidth = -1;
    int marginHeight = -1;
    if (ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(iframeTag)) {
        HTMLFrameElementBase* o = static_cast<HTMLFrameElementBase*>(ownerElement);
        allowsScrolling = o->scrollingMode() != ScrollbarAlwaysOff;
        marginWidth = o->getMarginWidth();
        marginHeight = o->getMarginHeight();
    }

    if (!canLoad(url, referrer)) {
        FrameLoader::reportLocalLoadFailed(m_frame, url.string());
        return 0;
    }

    bool hideReferrer = shouldHideReferrer(url, referrer);
    RefPtr<Frame> frame = m_client->createFrame(url, name, ownerElement, hideReferrer ? String() : referrer,
                                         allowsScrolling, marginWidth, marginHeight);

    if (!frame)  {
        checkCallImplicitClose();
        return 0;
    }
    
    frame->loader()->m_isComplete = false;
   
    RenderObject* renderer = ownerElement->renderer();
    FrameView* view = frame->view();
    if (renderer && renderer->isWidget() && view)
        static_cast<RenderWidget*>(renderer)->setWidget(view);
    
    checkCallImplicitClose();
    
    // In these cases, the synchronous load would have finished
    // before we could connect the signals, so make sure to send the 
    // completed() signal for the child by hand
    // FIXME: In this case the Frame will have finished loading before 
    // it's being added to the child list. It would be a good idea to
    // create the child first, then invoke the loader separately.
    if (url.isEmpty() || url == blankURL()) {
        frame->loader()->completed();
        frame->loader()->checkCompleted();
    }

    return frame.get();
}

void FrameLoader::submitFormAgain()
{
    if (m_isRunningScript)
        return;
    OwnPtr<FormSubmission> form(m_deferredFormSubmission.release());
    if (!form)
        return;
    submitForm(form->action, form->url, form->formData, form->target, form->contentType, form->boundary, form->event.get(), form->lockHistory, form->lockBackForwardList);
}

void FrameLoader::submitForm(const char* action, const String& url, PassRefPtr<FormData> formData,
    const String& target, const String& contentType, const String& boundary, Event* event, bool lockHistory, bool lockBackForwardList)
{
    ASSERT(formData);
    
    if (!m_frame->page())
        return;
    
    KURL u = completeURL(url.isNull() ? "" : url);
    // FIXME: Do we really need to special-case an empty URL?
    // Would it be better to just go on with the form submisson and let the I/O fail?
    if (u.isEmpty())
        return;

    if (u.protocolIs("javascript")) {
        m_isExecutingJavaScriptFormAction = true;
        executeIfJavaScriptURL(u, false, false);
        m_isExecutingJavaScriptFormAction = false;
        return;
    }

    if (m_isRunningScript) {
        if (m_deferredFormSubmission)
            return;
        m_deferredFormSubmission.set(new FormSubmission(action, url, formData, target, contentType, boundary, event, lockHistory, lockBackForwardList));
        return;
    }

    formData->generateFiles(m_frame->page()->chrome()->client());
    
    FrameLoadRequest frameRequest;

    if (!m_outgoingReferrer.isEmpty())
        frameRequest.resourceRequest().setHTTPReferrer(m_outgoingReferrer);

    frameRequest.setFrameName(target.isEmpty() ? m_frame->document()->baseTarget() : target);

    // Handle mailto: forms
    bool isMailtoForm = equalIgnoringCase(u.protocol(), "mailto");
    if (isMailtoForm && strcmp(action, "GET") != 0) {
        // Append body= for POST mailto, replace the whole query string for GET one.
        String body = formData->flattenToString();
        String query = u.query();
        if (!query.isEmpty())
            query.append('&');
        u.setQuery(query + body);
    }

    if (strcmp(action, "GET") == 0) {
        u.setQuery(formData->flattenToString());
    } else {
        if (!isMailtoForm)
            frameRequest.resourceRequest().setHTTPBody(formData.get());
        frameRequest.resourceRequest().setHTTPMethod("POST");

        // construct some user headers if necessary
        if (contentType.isNull() || contentType == "application/x-www-form-urlencoded")
            frameRequest.resourceRequest().setHTTPContentType(contentType);
        else // contentType must be "multipart/form-data"
            frameRequest.resourceRequest().setHTTPContentType(contentType + "; boundary=" + boundary);
    }

    frameRequest.resourceRequest().setURL(u);
    addHTTPOriginIfNeeded(frameRequest.resourceRequest(), outgoingOrigin());

    submitForm(frameRequest, event, lockHistory, lockBackForwardList);
}

void FrameLoader::stopLoading(bool sendUnload)
{
    if (m_frame->document() && m_frame->document()->tokenizer())
        m_frame->document()->tokenizer()->stopParsing();

    if (sendUnload) {
        if (m_frame->document()) {
            if (m_didCallImplicitClose && !m_wasUnloadEventEmitted) {
                Node* currentFocusedNode = m_frame->document()->focusedNode();
                if (currentFocusedNode)
                    currentFocusedNode->aboutToUnload();
                m_frame->document()->dispatchWindowEvent(eventNames().unloadEvent, false, false);
                if (m_frame->document())
                    m_frame->document()->updateRendering();
                m_wasUnloadEventEmitted = true;
                if (m_frame->eventHandler()->pendingFrameUnloadEventCount())
                    m_frame->eventHandler()->clearPendingFrameUnloadEventCount();
                if (m_frame->eventHandler()->pendingFrameBeforeUnloadEventCount())
                    m_frame->eventHandler()->clearPendingFrameBeforeUnloadEventCount();
            }
        }
        if (m_frame->document() && !m_frame->document()->inPageCache())
            m_frame->document()->removeAllEventListenersFromAllNodes();
    }

    m_isComplete = true; // to avoid calling completed() in finishedParsing() (David)
    m_isLoadingMainResource = false;
    m_didCallImplicitClose = true; // don't want that one either

    if (m_frame->document() && m_frame->document()->parsing()) {
        finishedParsing();
        m_frame->document()->setParsing(false);
    }
  
    m_workingURL = KURL();

    if (Document* doc = m_frame->document()) {
        if (DocLoader* docLoader = doc->docLoader())
            cache()->loader()->cancelRequests(docLoader);

#if ENABLE(DATABASE)
        doc->stopDatabases();
#endif
    }

    // tell all subframes to stop as well
    for (Frame* child = m_frame->tree()->firstChild(); child; child = child->tree()->nextSibling())
        child->loader()->stopLoading(sendUnload);

    cancelRedirection();
}

void FrameLoader::stop()
{
    // http://bugs.webkit.org/show_bug.cgi?id=10854
    // The frame's last ref may be removed and it will be deleted by checkCompleted().
    RefPtr<Frame> protector(m_frame);
    
    if (m_frame->document()->tokenizer())
        m_frame->document()->tokenizer()->stopParsing();
    m_frame->document()->finishParsing();

    if (m_iconLoader)
        m_iconLoader->stopLoading();
}

bool FrameLoader::closeURL()
{
    saveDocumentState();
    stopLoading(true);
    m_frame->editor()->clearUndoRedoOperations();
    return true;
}

void FrameLoader::cancelRedirection(bool cancelWithLoadInProgress)
{
    m_cancellingWithLoadInProgress = cancelWithLoadInProgress;

    stopRedirectionTimer();

    m_scheduledRedirection.clear();
}

KURL FrameLoader::iconURL()
{
    // If this isn't a top level frame, return nothing
    if (m_frame->tree() && m_frame->tree()->parent())
        return KURL();

    // If we have an iconURL from a Link element, return that
    if (!m_frame->document()->iconURL().isEmpty())
        return KURL(m_frame->document()->iconURL());

    // Don't return a favicon iconURL unless we're http or https
    if (!m_URL.protocolIs("http") && !m_URL.protocolIs("https"))
        return KURL();

    KURL url;
    url.setProtocol(m_URL.protocol());
    url.setHost(m_URL.host());
    if (int port = m_URL.port())
        url.setPort(port);
    url.setPath("/favicon.ico");
    return url;
}

bool FrameLoader::didOpenURL(const KURL& url)
{
    if (m_scheduledRedirection && m_scheduledRedirection->type == ScheduledRedirection::locationChangeDuringLoad)
        // A redirect was scheduled before the document was created.
        // This can happen when one frame changes another frame's location.
        return false;

    cancelRedirection();
    m_frame->editor()->clearLastEditCommand();
    closeURL();

    m_isComplete = false;
    m_isLoadingMainResource = true;
    m_didCallImplicitClose = false;

    m_frame->setJSStatusBarText(String());
    m_frame->setJSDefaultStatusBarText(String());

    m_URL = url;
    if ((m_URL.protocolIs("http") || m_URL.protocolIs("https")) && !m_URL.host().isEmpty() && m_URL.path().isEmpty())
        m_URL.setPath("/");
    m_workingURL = m_URL;

    started();

    return true;
}

void FrameLoader::didExplicitOpen()
{
    m_isComplete = false;
    m_didCallImplicitClose = false;

    // Calling document.open counts as committing the first real document load.
    m_committedFirstRealDocumentLoad = true;
    
    // Prevent window.open(url) -- eg window.open("about:blank") -- from blowing away results
    // from a subsequent window.document.open / window.document.write call. 
    // Cancelling redirection here works for all cases because document.open 
    // implicitly precedes document.write.
    cancelRedirection(); 
    if (m_frame->document()->url() != blankURL())
        m_URL = m_frame->document()->url();
}

bool FrameLoader::executeIfJavaScriptURL(const KURL& url, bool userGesture, bool replaceDocument)
{
    if (!url.protocolIs("javascript"))
        return false;

    if (m_frame->page() && !m_frame->page()->javaScriptURLsAreAllowed())
        return true;

    String script = decodeURLEscapeSequences(url.string().substring(strlen("javascript:")));
    ScriptValue result = executeScript(script, userGesture);

    String scriptResult;
    if (!result.getString(scriptResult))
        return true;

    SecurityOrigin* currentSecurityOrigin = 0;
    currentSecurityOrigin = m_frame->document()->securityOrigin();

    // FIXME: We should always replace the document, but doing so
    //        synchronously can cause crashes:
    //        http://bugs.webkit.org/show_bug.cgi?id=16782
    if (replaceDocument) {
        begin(m_URL, true, currentSecurityOrigin);
        write(scriptResult);
        end();
    }

    return true;
}

ScriptValue FrameLoader::executeScript(const String& script, bool forceUserGesture)
{
    return executeScript(ScriptSourceCode(script, forceUserGesture ? KURL() : m_URL));
}

ScriptValue FrameLoader::executeScript(const ScriptSourceCode& sourceCode)
{
    if (!m_frame->script()->isEnabled() || m_frame->script()->isPaused())
        return ScriptValue();

    bool wasRunningScript = m_isRunningScript;
    m_isRunningScript = true;

    ScriptValue result = m_frame->script()->evaluate(sourceCode);

    if (!wasRunningScript) {
        m_isRunningScript = false;