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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// based on //chrome/browser/plugins/pdf_iframe_navigation_throttle.cc
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/pdf_iframe_navigation_throttle_qt.h"
#include "chrome/grit/renderer_resources.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/download_utils.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/plugin_service.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_user_data.h"
#include "content/public/common/webplugininfo.h"
#include "base/strings/escape.h"
#include "net/http/http_response_headers.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/webui/jstemplate_builder.h"
#include "ui/base/webui/web_ui_util.h"
#include <QtGlobal>
namespace extensions {
constexpr char kPDFMimeType[] = "application/pdf";
// Used to scope the posted navigation task to the lifetime of |web_contents|.
class PdfWebContentsLifetimeHelper : public content::WebContentsUserData<PdfWebContentsLifetimeHelper>
{
public:
explicit PdfWebContentsLifetimeHelper(content::WebContents *web_contents)
: content::WebContentsUserData<PdfWebContentsLifetimeHelper>(*web_contents)
, web_contents_(web_contents)
{}
base::WeakPtr<PdfWebContentsLifetimeHelper> GetWeakPtr()
{
return weak_factory_.GetWeakPtr();
}
void NavigateIFrameToPlaceholder(const content::OpenURLParams &url_params)
{
web_contents_->OpenURL(url_params);
}
private:
friend class content::WebContentsUserData<PdfWebContentsLifetimeHelper>;
content::WebContents *const web_contents_;
base::WeakPtrFactory<PdfWebContentsLifetimeHelper> weak_factory_{this};
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
WEB_CONTENTS_USER_DATA_KEY_IMPL(PdfWebContentsLifetimeHelper);
bool IsPDFPluginEnabled(content::NavigationHandle *navigation_handle, bool *is_stale)
{
content::WebContents *web_contents = navigation_handle->GetWebContents();
Q_ASSERT(web_contents);
if (web_contents->IsInnerWebContentsForGuest())
web_contents = web_contents->GetOuterWebContents();
int process_id = web_contents->GetMainFrame()->GetProcess()->GetID();
int routing_id = web_contents->GetMainFrame()->GetRoutingID();
content::WebPluginInfo plugin_info;
// Will check WebEngineSettings by PluginServiceFilterQt
return content::PluginService::GetInstance()->GetPluginInfo(
process_id, routing_id, navigation_handle->GetURL(),
kPDFMimeType,
false /* allow_wildcard */, is_stale, &plugin_info,
nullptr /* actual_mime_type */);
}
std::string GetPDFPlaceholderHTML(const GURL &pdf_url)
{
std::string template_html = ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(IDR_PDF_PLUGIN_HTML);
webui::AppendWebUiCssTextDefaults(&template_html);
base::DictionaryValue values;
values.SetString("fileName", pdf_url.ExtractFileName());
values.SetString("open", l10n_util::GetStringUTF8(IDS_ACCNAME_OPEN));
values.SetString("pdfUrl", pdf_url.spec());
return webui::GetI18nTemplateHtml(template_html, &values);
}
// static
std::unique_ptr<content::NavigationThrottle>
PDFIFrameNavigationThrottleQt::MaybeCreateThrottleFor(content::NavigationHandle *handle)
{
if (handle->IsInMainFrame())
return nullptr;
return std::make_unique<PDFIFrameNavigationThrottleQt>(handle);
}
PDFIFrameNavigationThrottleQt::PDFIFrameNavigationThrottleQt(content::NavigationHandle *handle)
: content::NavigationThrottle(handle)
{
}
PDFIFrameNavigationThrottleQt::~PDFIFrameNavigationThrottleQt()
{
}
content::NavigationThrottle::ThrottleCheckResult PDFIFrameNavigationThrottleQt::WillProcessResponse()
{
const net::HttpResponseHeaders *response_headers = navigation_handle()->GetResponseHeaders();
if (!response_headers)
return content::NavigationThrottle::PROCEED;
std::string mime_type;
response_headers->GetMimeType(&mime_type);
if (mime_type != kPDFMimeType)
return content::NavigationThrottle::PROCEED;
// We MUST download responses marked as attachments rather than showing
// a placeholder.
if (content::download_utils::MustDownload(navigation_handle()->GetURL(), response_headers, mime_type))
return content::NavigationThrottle::PROCEED;
bool is_stale = false;
bool pdf_plugin_enabled = IsPDFPluginEnabled(navigation_handle(), &is_stale);
if (is_stale) {
// On browser start, the plugin list may not be ready yet.
content::PluginService::GetInstance()->GetPlugins(
base::BindOnce(&PDFIFrameNavigationThrottleQt::OnPluginsLoaded,
weak_factory_.GetWeakPtr()));
return content::NavigationThrottle::DEFER;
}
// If the plugin was found, proceed on the navigation. Otherwise fall through
// to the placeholder case.
if (pdf_plugin_enabled)
return content::NavigationThrottle::PROCEED;
LoadPlaceholderHTML();
return content::NavigationThrottle::CANCEL_AND_IGNORE;
}
const char *PDFIFrameNavigationThrottleQt::GetNameForLogging()
{
return "PDFIFrameNavigationThrottleQt";
}
void PDFIFrameNavigationThrottleQt::OnPluginsLoaded(
const std::vector<content::WebPluginInfo> &plugins)
{
if (IsPDFPluginEnabled(navigation_handle(), nullptr /* is_stale */)) {
Resume();
} else {
LoadPlaceholderHTML();
CancelDeferredNavigation(content::NavigationThrottle::CANCEL_AND_IGNORE);
}
}
void PDFIFrameNavigationThrottleQt::LoadPlaceholderHTML()
{
// Prepare the params to navigate to the placeholder.
std::string html = GetPDFPlaceholderHTML(navigation_handle()->GetURL());
GURL data_url("data:text/html," + base::EscapePath(html));
content::OpenURLParams params = content::OpenURLParams::FromNavigationHandle(navigation_handle());
params.url = data_url;
params.transition = ui::PAGE_TRANSITION_AUTO_SUBFRAME;
// Post a task to navigate to the placeholder HTML. We don't navigate
// synchronously here, as starting a navigation within a navigation is
// an antipattern. Use a helper object scoped to the WebContents lifetime to
// scope the navigation task to the WebContents lifetime.
content::WebContents *web_contents = navigation_handle()->GetWebContents();
if (!web_contents)
return;
PdfWebContentsLifetimeHelper::CreateForWebContents(web_contents);
PdfWebContentsLifetimeHelper *helper = PdfWebContentsLifetimeHelper::FromWebContents(web_contents);
base::SequencedTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::BindOnce(&PdfWebContentsLifetimeHelper::NavigateIFrameToPlaceholder,
helper->GetWeakPtr(), std::move(params)));
}
} // namespace extensions
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