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ash / ambient / ambient_backup_photo_downloader.h [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_AMBIENT_AMBIENT_BACKUP_PHOTO_DOWNLOADER_H_
#define ASH_AMBIENT_AMBIENT_BACKUP_PHOTO_DOWNLOADER_H_
#include <string>
#include <vector>
#include "ash/ash_export.h"
#include "base/files/file_path.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "ui/gfx/geometry/size.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace gfx {
class ImageSkia;
} // namespace gfx
namespace ash {
class AmbientAccessTokenController;
// Downloads a "backup" image from a fixed url, resizes it to roughly match a
// target size provided by the caller, and saves it to disc. After it's
// downloaded, the backup image may be used in future ambient sessions if there
// are issues fetching the primary stream of photos from the backend.
//
// `AmbientBackupPhotoDownloader` only downloads/saves one photo in its lifetime
// and runs the `completion_cb` when done. It may be destroyed at any point to
// stop whatever task it's running internally, and the `completion_cb` will not
// be run.
class ASH_EXPORT AmbientBackupPhotoDownloader {
public:
AmbientBackupPhotoDownloader(
AmbientAccessTokenController& access_token_controller,
int cache_idx,
gfx::Size target_size,
const std::string& url,
base::OnceCallback<void(bool success)> completion_cb);
AmbientBackupPhotoDownloader(const AmbientBackupPhotoDownloader&) = delete;
AmbientBackupPhotoDownloader& operator=(const AmbientBackupPhotoDownloader&) =
delete;
~AmbientBackupPhotoDownloader();
private:
void RunCompletionCallback(bool success);
void DecodeImage(base::FilePath temp_image_path);
void ScheduleResizeAndEncode(const gfx::ImageSkia& decoded_image);
void SaveImage(const std::vector<unsigned char>& encoded_image);
const int cache_idx_;
const gfx::Size target_size_;
const scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
base::OnceCallback<void(bool success)> completion_cb_;
// Temporary location where the image is downloaded first before it is
// resized and then saved to the final destination.
base::FilePath temp_image_path_;
base::WeakPtrFactory<AmbientBackupPhotoDownloader> weak_factory_{this};
};
} // namespace ash
#endif // ASH_AMBIENT_AMBIENT_BACKUP_PHOTO_DOWNLOADER_H_