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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file provides API functions to fetch external thumbnails for filesystem
// providers that support it.
#ifndef CHROME_BROWSER_ASH_EXTENSIONS_FILE_MANAGER_IMAGE_LOADER_PRIVATE_API_H_
#define CHROME_BROWSER_ASH_EXTENSIONS_FILE_MANAGER_IMAGE_LOADER_PRIVATE_API_H_
#include <memory>
#include <string>
#include <vector>
#include "chrome/browser/ash/arc/fileapi/arc_documents_provider_root.h"
#include "chrome/browser/ash/extensions/file_manager/logged_extension_function.h"
#include "chrome/common/extensions/api/image_loader_private.h"
#include "chrome/services/pdf/public/mojom/pdf_thumbnailer.mojom.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "storage/browser/file_system/file_system_url.h"
class SkBitmap;
namespace extensions {
// Base class for thumbnail functions
class ImageLoaderPrivateGetThumbnailFunction : public LoggedExtensionFunction {
public:
ImageLoaderPrivateGetThumbnailFunction();
protected:
~ImageLoaderPrivateGetThumbnailFunction() override = default;
// Responds with a base64 encoded PNG thumbnail data.
void SendEncodedThumbnail(std::string thumbnail_data_url);
};
class ImageLoaderPrivateGetDriveThumbnailFunction
: public ImageLoaderPrivateGetThumbnailFunction {
public:
DECLARE_EXTENSION_FUNCTION("imageLoaderPrivate.getDriveThumbnail",
IMAGELOADERPRIVATE_GETDRIVETHUMBNAIL)
ImageLoaderPrivateGetDriveThumbnailFunction();
protected:
~ImageLoaderPrivateGetDriveThumbnailFunction() override;
// ExtensionFunction overrides.
ResponseAction Run() override;
private:
// A callback invoked when thumbnail data has been generated.
void GotThumbnail(const std::optional<std::vector<uint8_t>>& data);
};
class ImageLoaderPrivateGetPdfThumbnailFunction
: public ImageLoaderPrivateGetThumbnailFunction {
public:
DECLARE_EXTENSION_FUNCTION("imageLoaderPrivate.getPdfThumbnail",
IMAGELOADERPRIVATE_GETPDFTHUMBNAIL)
ImageLoaderPrivateGetPdfThumbnailFunction();
protected:
~ImageLoaderPrivateGetPdfThumbnailFunction() override;
// ExtensionFunction overrides.
ResponseAction Run() override;
private:
// For a given `content` starts fetching the first page PDF thumbnail by
// calling PdfThumbnailer from PdfService. The first parameters, `size` is
// supplied by the JavaScript caller.
void FetchThumbnail(const gfx::Size& size, const std::string& content);
// Callback invoked by the thumbnailing service when a PDF thumbnail has been
// generated. The solitary parameter |bitmap| is supplied by the callback.
// If |bitmap| is null, an error occurred. Otherwise, |bitmap| contains the
// generated thumbnail.
void GotThumbnail(const SkBitmap& bitmap);
// Handles a mojo channel disconnect event.
void ThumbnailDisconnected();
// Holds the channel to Printing PDF thumbnailing service. Bound only
// when needed.
mojo::Remote<pdf::mojom::PdfThumbnailer> pdf_thumbnailer_;
// The dots per inch (dpi) resolution at which the PDF is rendered to a
// thumbnail. The value of 30 is selected so that a US Letter size page does
// not overflow a kSize x kSize thumbnail.
constexpr static int kDpi = 30;
};
class ImageLoaderPrivateGetArcDocumentsProviderThumbnailFunction
: public ImageLoaderPrivateGetThumbnailFunction {
public:
DECLARE_EXTENSION_FUNCTION(
"imageLoaderPrivate.getArcDocumentsProviderThumbnail",
IMAGELOADERPRIVATE_GETARCDOCUMENTSPROVIDERTHUMBNAIL)
ImageLoaderPrivateGetArcDocumentsProviderThumbnailFunction();
protected:
~ImageLoaderPrivateGetArcDocumentsProviderThumbnailFunction() override;
// ExtensionFunction overrides.
ResponseAction Run() override;
private:
// A callback invoked when ExtraFileMetadata is returned from ARC.
void OnGetExtraFileMetadata(
const gfx::Size& size_hint,
const storage::FileSystemURL& file_system_url,
base::File::Error result,
const arc::ArcDocumentsProviderRoot::ExtraFileMetadata& metadata);
// A callback invoked when a FilesystemURL is resolved to content URLs.
// |paths_to_share| is always expected to be empty because
// ArcDocumentsProviderThumbnail related functions do not share path
// to ARCVM via Seneschal.
void GotContentUrls(const gfx::Size& size_hint,
const std::vector<GURL>& urls,
const std::vector<base::FilePath>& paths_to_share);
// A callback invoked when ARC thumbnail file has been opened.
void GotArcThumbnailFileHandle(mojo::ScopedHandle handle);
};
} // namespace extensions
#endif // CHROME_BROWSER_ASH_EXTENSIONS_FILE_MANAGER_IMAGE_LOADER_PRIVATE_API_H_
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