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// Copyright 2014 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 EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
#define EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
#include <map>
#include <set>
#include <string>
#include <utility>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "extensions/browser/content_verifier/content_hash.h"
#include "extensions/common/extension_id.h"
namespace base {
class SequencedTaskRunner;
}
namespace network {
class SimpleURLLoader;
} // namespace network
namespace extensions {
namespace internals {
// This class is responsible for getting signed expected hashes for use in
// extension content verification.
//
// This class takes care of doing the network I/O work to ensure we
// have the contents of verified_contents.json files from the webstore.
//
// Note: This class manages its own lifetime. It deletes itself when
// Start() completes at OnSimpleLoaderComplete().
//
// Note: This class is an internal implementation detail of ContentHash and is
// not be used independently.
// TODO(lazyboy): Consider changing BUILD rules to enforce the above, yet
// keeping the class unit testable.
class ContentHashFetcher {
public:
// A callback for when fetch is complete.
// The response contents is passed through std::unique_ptr<std::string>. In
// case of failure the error code is passed as a last argument.
using HashFetcherCallback =
base::OnceCallback<void(ContentHash::FetchKey,
std::unique_ptr<std::string>,
ContentHash::FetchErrorCode)>;
ContentHashFetcher(ContentHash::FetchKey fetch_key);
// Note: |this| is deleted once OnSimpleLoaderComplete() completes.
void Start(HashFetcherCallback hash_fetcher_callback);
private:
friend class base::RefCounted<ContentHashFetcher>;
~ContentHashFetcher();
void OnSimpleLoaderComplete(std::unique_ptr<std::string> response_body);
ContentHash::FetchKey fetch_key_;
HashFetcherCallback hash_fetcher_callback_;
scoped_refptr<base::SequencedTaskRunner> response_task_runner_;
// Alive when url fetch is ongoing.
std::unique_ptr<network::SimpleURLLoader> simple_loader_;
SEQUENCE_CHECKER(sequence_checker_);
DISALLOW_COPY_AND_ASSIGN(ContentHashFetcher);
};
} // namespace internals
} // namespace extensions
#endif // EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
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