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/*
* Copyright (C) 2012 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,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebHelperPluginImpl.h"
#include "PageWidgetDelegate.h"
#include "WebDocument.h"
#include "WebFrameClient.h"
#include "WebFrameImpl.h"
#include "WebPlugin.h"
#include "WebPluginContainerImpl.h"
#include "WebViewClient.h"
#include "WebViewImpl.h"
#include "WebWidgetClient.h"
#include "core/dom/NodeList.h"
#include "core/html/HTMLPlugInElement.h"
#include "core/loader/DocumentLoader.h"
#include "core/loader/EmptyClients.h"
#include "core/page/FocusController.h"
#include "core/frame/FrameView.h"
#include "core/page/Page.h"
#include "core/page/Settings.h"
using namespace WebCore;
namespace WebKit {
#define addLiteral(literal, writer) writer->addData(literal, sizeof(literal) - 1)
static inline void addString(const String& str, DocumentWriter* writer)
{
CString str8 = str.utf8();
writer->addData(str8.data(), str8.length());
}
static void writeDocument(const String& pluginType, const WebDocument& hostDocument, WebCore::DocumentLoader* loader)
{
// Give the new document the same URL as the hose document so that content
// settings and other decisions can be made based on the correct origin.
const WebURL& url = hostDocument.url();
DocumentWriter* writer = loader->beginWriting("text/html", "UTF-8", url);
addLiteral("<!DOCTYPE html><head><meta charset='UTF-8'></head><body>\n", writer);
String objectTag = "<object type=\"" + pluginType + "\"></object>";
addString(objectTag, writer);
addLiteral("</body>\n", writer);
loader->endWriting(writer);
}
class HelperPluginChromeClient : public EmptyChromeClient {
WTF_MAKE_NONCOPYABLE(HelperPluginChromeClient);
WTF_MAKE_FAST_ALLOCATED;
public:
explicit HelperPluginChromeClient(WebHelperPluginImpl* widget)
: m_widget(widget)
{
ASSERT(m_widget->m_widgetClient);
}
private:
virtual void closeWindowSoon() OVERRIDE
{
// This should never be called since the only way to close the
// invisible page is via closeHelperPlugin().
ASSERT_NOT_REACHED();
m_widget->closeHelperPlugin();
}
virtual void* webView() const OVERRIDE
{
return m_widget->m_webView;
}
WebHelperPluginImpl* m_widget;
};
// HelperPluginFrameClient acts as a filter to only forward messages onto the
// main render frame that WebHelperPlugin actually needs. This prevents
// having the WebHelperPlugin's frame accidentally signaling events on the
// client that are meant only for WebFrames which are part of the main DOM.
class HelperPluginFrameClient : public WebFrameClient {
public:
HelperPluginFrameClient(WebFrameClient* hostWebFrameClient)
: m_hostWebFrameClient(hostWebFrameClient)
{
}
virtual ~HelperPluginFrameClient()
{
}
virtual WebPlugin* createPlugin(WebKit::WebFrame* frame, const WebPluginParams& params)
{
return m_hostWebFrameClient->createPlugin(frame, params);
}
private:
WebFrameClient* m_hostWebFrameClient;
};
// WebHelperPluginImpl ----------------------------------------------------------------
WebHelperPluginImpl::WebHelperPluginImpl(WebWidgetClient* client)
: m_widgetClient(client)
, m_webView(0)
, m_mainFrame(0)
{
ASSERT(client);
}
WebHelperPluginImpl::~WebHelperPluginImpl()
{
ASSERT(!m_page);
}
bool WebHelperPluginImpl::initialize(const String& pluginType, const WebDocument& hostDocument, WebViewImpl* webView)
{
ASSERT(webView);
m_webView = webView;
return initializePage(pluginType, hostDocument);
}
void WebHelperPluginImpl::closeHelperPlugin()
{
if (m_page) {
m_page->clearPageGroup();
m_page->mainFrame()->loader().stopAllLoaders();
}
// We must destroy the page now in case the host page is being destroyed, in
// which case some of the objects the page depends on may have been
// destroyed by the time this->close() is called asynchronously.
destroyPage();
// m_widgetClient might be 0 because this widget might be already closed.
if (m_widgetClient) {
// closeWidgetSoon() will call this->close() later.
m_widgetClient->closeWidgetSoon();
}
m_mainFrame->close();
}
void WebHelperPluginImpl::initializeFrame(WebFrameClient* client)
{
ASSERT(m_page);
ASSERT(!m_frameClient);
m_frameClient = adoptPtr(new HelperPluginFrameClient(client));
m_mainFrame = WebFrameImpl::create(m_frameClient.get());
m_mainFrame->initializeAsMainFrame(m_page.get());
}
// Returns a pointer to the WebPlugin by finding the single <object> tag in the page.
WebPlugin* WebHelperPluginImpl::getPlugin()
{
ASSERT(m_page);
RefPtr<NodeList> objectElements = m_page->mainFrame()->document()->getElementsByTagName(WebCore::HTMLNames::objectTag.localName());
ASSERT(objectElements && objectElements->length() == 1);
if (!objectElements || objectElements->length() < 1)
return 0;
Node* node = objectElements->item(0);
ASSERT(node->hasTagName(WebCore::HTMLNames::objectTag));
WebCore::Widget* widget = toHTMLPlugInElement(node)->pluginWidget();
if (!widget)
return 0;
WebPlugin* plugin = toPluginContainerImpl(widget)->plugin();
ASSERT(plugin);
// If the plugin is a placeholder, it is not useful to the caller, and it
// could be replaced at any time. Therefore, do not return it.
if (plugin->isPlaceholder())
return 0;
// The plugin was instantiated and will outlive this object.
return plugin;
}
bool WebHelperPluginImpl::initializePage(const String& pluginType, const WebDocument& hostDocument)
{
Page::PageClients pageClients;
fillWithEmptyClients(pageClients);
m_chromeClient = adoptPtr(new HelperPluginChromeClient(this));
pageClients.chromeClient = m_chromeClient.get();
m_page = adoptPtr(new Page(pageClients));
ASSERT(!m_page->settings().isScriptEnabled());
m_page->settings().setPluginsEnabled(true);
m_webView->client()->initializeHelperPluginWebFrame(this);
// The page's main frame was set in initializeFrame() as a result of the above call.
Frame* frame = m_page->mainFrame();
ASSERT(frame);
frame->loader().forceSandboxFlags(SandboxAll & ~SandboxPlugins);
frame->setView(FrameView::create(frame));
// No need to set a size or make it not transparent.
writeDocument(pluginType, hostDocument, frame->loader().activeDocumentLoader());
return true;
}
void WebHelperPluginImpl::destroyPage()
{
if (!m_page)
return;
if (m_page->mainFrame())
m_page->mainFrame()->loader().frameDetached();
m_page.clear();
}
void WebHelperPluginImpl::layout()
{
PageWidgetDelegate::layout(m_page.get());
}
void WebHelperPluginImpl::setFocus(bool)
{
ASSERT_NOT_REACHED();
}
void WebHelperPluginImpl::close()
{
ASSERT(!m_page); // Should only be called via closePopup().
m_widgetClient = 0;
deref();
}
// WebHelperPlugin ----------------------------------------------------------------
WebHelperPlugin* WebHelperPlugin::create(WebWidgetClient* client)
{
RELEASE_ASSERT(client);
// A WebHelperPluginImpl instance usually has two references.
// - One owned by the instance itself. It represents the visible widget.
// - One owned by the hosting element. It's released when the hosting
// element asks the WebHelperPluginImpl to close.
// We need them because the closing operation is asynchronous and the widget
// can be closed while the hosting element is unaware of it.
return adoptRef(new WebHelperPluginImpl(client)).leakRef();
}
} // namespace WebKit