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// Copyright (C) 2022 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/pdf/chrome_pdf_stream_delegate.cc:
#include "pdf_stream_delegate_qt.h"
#include "base/no_destructor.h"
#include "chrome/grit/pdf_resources.h"
#include "content/public/browser/document_user_data.h"
#include "content/public/browser/navigation_handle.h"
#include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
#include "extensions/common/constants.h"
#include "ui/base/resource/resource_bundle.h"
// Associates a `pdf::PdfStreamDelegate::StreamInfo` with the PDF extension's
// or Print Preview's `blink::Document`.
// `ChromePdfStreamDelegate::MapToOriginalUrl()` initializes this in
// `PdfNavigationThrottle`, and then `ChromePdfStreamDelegate::GetStreamInfo()`
// returns the stashed result to `PdfURLLoaderRequestInterceptor`.
class StreamInfoHelper : public content::DocumentUserData<StreamInfoHelper>
{
public:
absl::optional<pdf::PdfStreamDelegate::StreamInfo> TakeStreamInfo()
{ return std::move(stream_info_); }
private:
friend class content::DocumentUserData<StreamInfoHelper>;
DOCUMENT_USER_DATA_KEY_DECL();
StreamInfoHelper(content::RenderFrameHost* embedder_frame,
pdf::PdfStreamDelegate::StreamInfo stream_info)
: content::DocumentUserData<StreamInfoHelper>(embedder_frame),
stream_info_(std::move(stream_info)) {}
absl::optional<pdf::PdfStreamDelegate::StreamInfo> stream_info_;
};
DOCUMENT_USER_DATA_KEY_IMPL(StreamInfoHelper);
PdfStreamDelegateQt::PdfStreamDelegateQt() = default;
PdfStreamDelegateQt::~PdfStreamDelegateQt() = default;
absl::optional<GURL> PdfStreamDelegateQt::MapToOriginalUrl(content::NavigationHandle &navigation_handle)
{
content::RenderFrameHost *embedder_frame = navigation_handle.GetParentFrame();
StreamInfoHelper *helper = StreamInfoHelper::GetForCurrentDocument(embedder_frame);
if (helper) {
// PDF viewer and Print Preview only do this once per WebContents.
return absl::nullopt;
}
GURL original_url;
StreamInfo info;
content::WebContents* contents = navigation_handle.GetWebContents();
extensions::MimeHandlerViewGuest *guest =
extensions::MimeHandlerViewGuest::FromWebContents(contents);
if (guest) {
base::WeakPtr<extensions::StreamContainer> stream = guest->GetStreamWeakPtr();
if (!stream || stream->extension_id() != extension_misc::kPdfExtensionId ||
stream->stream_url() != navigation_handle.GetURL() ||
!stream->pdf_plugin_attributes()) {
return absl::nullopt;
}
original_url = stream->original_url();
info.background_color = base::checked_cast<SkColor>(stream->pdf_plugin_attributes()->background_color);
info.full_frame = !stream->embedded();
info.allow_javascript = stream->pdf_plugin_attributes()->allow_javascript;
} else {
return absl::nullopt;
}
static const base::NoDestructor<std::string> injected_script(
ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
IDR_PDF_PDF_INTERNAL_PLUGIN_WRAPPER_ROLLUP_JS));
info.stream_url = navigation_handle.GetURL();
info.original_url = original_url;
info.injected_script = injected_script.get();
StreamInfoHelper::CreateForCurrentDocument(embedder_frame, std::move(info));
return original_url;
}
absl::optional<pdf::PdfStreamDelegate::StreamInfo>
PdfStreamDelegateQt::GetStreamInfo(content::RenderFrameHost* embedder_frame)
{
if (!embedder_frame)
return absl::nullopt;
StreamInfoHelper *helper = StreamInfoHelper::GetForCurrentDocument(embedder_frame);
if (!helper)
return absl::nullopt;
// Only the call immediately following `MapToOriginalUrl()` requires a valid
// `StreamInfo`; subsequent calls should just get nothing.
return helper->TakeStreamInfo();
}
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