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// Copyright 2018 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.
#include "chrome/browser/extensions/api/media_galleries/blob_data_source_factory.h"
#include "content/public/browser/browser_context.h"
#include "extensions/browser/blob_reader.h"
#include "mojo/public/cpp/bindings/binding.h"
namespace extensions {
namespace {
// Media data source that reads data from a blob in browser process.
class BlobMediaDataSource : public chrome::mojom::MediaDataSource {
public:
BlobMediaDataSource(chrome::mojom::MediaDataSourcePtr* interface,
content::BrowserContext* browser_context,
const std::string& blob_uuid,
BlobDataSourceFactory::MediaDataCallback callback)
: binding_(this, mojo::MakeRequest(interface)),
browser_context_(browser_context),
blob_uuid_(blob_uuid),
callback_(callback),
weak_factory_(this) {}
~BlobMediaDataSource() override = default;
private:
// chrome::mojom::MediaDataSource implementation.
void Read(int64_t position,
int64_t length,
chrome::mojom::MediaDataSource::ReadCallback callback) override {
StartBlobRequest(std::move(callback), position, length);
}
void StartBlobRequest(chrome::mojom::MediaDataSource::ReadCallback callback,
int64_t position,
int64_t length) {
BlobReader* reader = new BlobReader( // BlobReader is self-deleting.
browser_context_, blob_uuid_,
base::BindRepeating(&BlobMediaDataSource::OnBlobReaderDone,
weak_factory_.GetWeakPtr(),
base::Passed(&callback)));
reader->SetByteRange(position, length);
reader->Start();
}
void OnBlobReaderDone(chrome::mojom::MediaDataSource::ReadCallback callback,
std::unique_ptr<std::string> data,
int64_t size) {
callback_.Run(std::move(callback), std::move(data));
}
mojo::Binding<chrome::mojom::MediaDataSource> binding_;
content::BrowserContext* const browser_context_;
std::string blob_uuid_;
BlobDataSourceFactory::MediaDataCallback callback_;
base::WeakPtrFactory<BlobMediaDataSource> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(BlobMediaDataSource);
};
} // namespace
BlobDataSourceFactory::BlobDataSourceFactory(
content::BrowserContext* browser_context,
const std::string& blob_uuid)
: browser_context_(browser_context), blob_uuid_(blob_uuid) {}
BlobDataSourceFactory::~BlobDataSourceFactory() = default;
std::unique_ptr<chrome::mojom::MediaDataSource>
BlobDataSourceFactory::CreateMediaDataSource(
chrome::mojom::MediaDataSourcePtr* request,
MediaDataCallback media_data_callback) {
return std::make_unique<BlobMediaDataSource>(request, browser_context_,
blob_uuid_, media_data_callback);
}
} // namespace extensions
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