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// 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 CHROME_BROWSER_PRINTING_PDF_BLOB_DATA_FLATTENER_H_
#define CHROME_BROWSER_PRINTING_PDF_BLOB_DATA_FLATTENER_H_
#include <memory>
#include "base/auto_reset.h"
#include "base/functional/callback_forward.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/weak_ptr.h"
#include "chrome/services/printing/public/mojom/pdf_flattener.mojom.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/mojom/blob/blob.mojom.h"
class Profile;
namespace printing {
class MetafileSkia;
struct FlattenPdfResult {
FlattenPdfResult(std::unique_ptr<MetafileSkia> flattened_pdf_in,
uint32_t page_count);
~FlattenPdfResult();
// `flattened_pdf` is never null.
std::unique_ptr<MetafileSkia> flattened_pdf;
// `page_count` is always strictly greater than zero.
uint32_t page_count;
};
// PdfBlobDataFlattener is responsible for reading and flattening PDF files from
// Blob objects into instances of MetafileSkia. This class is only built on
// ChromeOS; however, there are no technical limitations in expanding it to
// other platforms too.
class PdfBlobDataFlattener {
public:
using ReadAndFlattenPdfCallback =
base::OnceCallback<void(std::unique_ptr<FlattenPdfResult> result)>;
explicit PdfBlobDataFlattener(Profile* profile);
~PdfBlobDataFlattener();
// We want to have an ability to disable PDF flattening for unit tests as
// printing::mojom::PdfFlattener requires real browser instance to be able to
// handle requests.
static base::AutoReset<bool> DisablePdfFlatteningForTesting();
// Runs `callback` with a MetafileSkia with the contents of the flattened PDF,
// or `nullptr` if an error has been encountered.
// `this` is guaranteed to outlive `callback`.
void ReadAndFlattenPdf(mojo::PendingRemote<blink::mojom::Blob> blob,
ReadAndFlattenPdfCallback callback);
private:
void OnPdfRead(ReadAndFlattenPdfCallback callback,
std::string data,
int64_t blob_total_size);
void OnPdfFlattened(ReadAndFlattenPdfCallback callback,
mojom::FlattenPdfResultPtr result);
const raw_ref<Profile> profile_;
mojo::Remote<mojom::PdfFlattener> flattener_;
base::WeakPtrFactory<PdfBlobDataFlattener> weak_factory_{this};
};
} // namespace printing
#endif // CHROME_BROWSER_PRINTING_PDF_BLOB_DATA_FLATTENER_H_
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