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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_READER_H_
#define EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_
#include <memory>
#include <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/version.h"
#include "extensions/browser/computed_hashes.h"
#include "extensions/browser/content_verifier/content_verifier_key.h"
#include "extensions/common/extension_id.h"
namespace extensions {
class ContentHash;
// This class creates an object that will read expected hashes that may have
// been fetched/calculated by the ContentHashFetcher, and vends them out for
// use in ContentVerifyJob's.
class ContentHashReader {
public:
enum class InitStatus {
// Extension has no hashes for resources verification.
HASHES_MISSING,
// Extension has hashes files, but they are unreadable or corrupted.
HASHES_DAMAGED,
// Resource doesn't have entry in hashes, and this is as expected since
// extension doesn't have such resource.
NO_HASHES_FOR_NON_EXISTING_RESOURCE,
// Resource doesn't have entry in hashes, but it should be there.
NO_HASHES_FOR_RESOURCE,
// Ready to verify resource's content.
SUCCESS
};
~ContentHashReader();
// Factory to create ContentHashReader to get expected hashes for the file at
// |relative_path| within an extension.
// Must be called on a thread that is allowed to do file I/O. Returns an
// instance whose success or failure type can be determined by calling
// status() method. On failure, this object should likely be discarded.
static std::unique_ptr<const ContentHashReader> Create(
const base::FilePath& relative_path,
const scoped_refptr<const ContentHash>& content_hash);
InitStatus status() const { return status_; }
// Return the number of blocks and block size, respectively. Only valid after
// calling Init().
int block_count() const;
int block_size() const;
// Returns a pointer to the expected sha256 hash value for the block at the
// given index. Only valid after calling Init().
bool GetHashForBlock(int block_index, const std::string** result) const;
private:
explicit ContentHashReader(InitStatus status);
InitStatus status_;
// The blocksize used for generating the hashes.
int block_size_ = 0;
std::vector<std::string> hashes_;
DISALLOW_COPY_AND_ASSIGN(ContentHashReader);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_
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