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// Copyright 2019 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.
#ifndef CONTENT_BROWSER_DOWNLOAD_DATA_URL_BLOB_READER_H_
#define CONTENT_BROWSER_DOWNLOAD_DATA_URL_BLOB_READER_H_
#include <string>
#include "base/callback_forward.h"
#include "base/sequence_checker.h"
#include "content/common/content_export.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/system/data_pipe_drainer.h"
#include "third_party/blink/public/mojom/blob/blob.mojom.h"
#include "url/gurl.h"
namespace storage {
class BlobDataHandle;
} // namespace storage
namespace content {
// Helper class to read a data url from a BlobDataHandle.
class CONTENT_EXPORT DataURLBlobReader : public mojo::DataPipeDrainer::Client {
public:
using ReadCompletionCallback = base::OnceCallback<void(GURL)>;
// Read the data URL from |blob_data_handle|, and call
// |read_completion_callback| once it completes. If the data URL cannot be
// retrieved, |read_completion_callback| will be called with an empty URL.
// This method must be called on the UI thread.
static void ReadDataURLFromBlob(
mojo::PendingRemote<blink::mojom::Blob> data_url_blob,
ReadCompletionCallback read_completion_callback);
~DataURLBlobReader() override;
private:
DataURLBlobReader(mojo::PendingRemote<blink::mojom::Blob> data_url_blob);
// Starts reading from the |data_url_blob_| and calls |callback| once
// completes.
void Start(base::OnceClosure callback);
// mojo::DataPipeDrainer:
void OnDataAvailable(const void* data, size_t num_bytes) override;
void OnDataComplete() override;
// Called when failed to read from blob.
void OnFailed();
std::unique_ptr<mojo::DataPipeDrainer> data_pipe_drainer_;
mojo::Remote<blink::mojom::Blob> data_url_blob_;
// Data URL retrieved from the blob.
std::string url_data_;
// Callback to run once blob data is read.
base::OnceClosure callback_;
SEQUENCE_CHECKER(sequence_checker_);
DISALLOW_COPY_AND_ASSIGN(DataURLBlobReader);
};
} // namespace content
#endif // CONTENT_BROWSER_DOWNLOAD_DATA_URL_BLOB_READER_H_
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