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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 <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/version.h"
#include "extensions/browser/content_verifier_delegate.h"
namespace extensions {
class VerifiedContents;
// 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 base::RefCountedThreadSafe<ContentHashReader> {
public:
// Create one of these to get expected hashes for the file at |relative_path|
// within an extension.
ContentHashReader(const std::string& extension_id,
const base::Version& extension_version,
const base::FilePath& extension_root,
const base::FilePath& relative_path,
const ContentVerifierKey& key);
const std::string& extension_id() const { return extension_id_; }
const base::FilePath& relative_path() const { return relative_path_; }
// This should be called to initialize this object (reads the expected hashes
// from storage, etc.). Must be called on a thread that is allowed to do file
// I/O. Returns a boolean indicating success/failure. On failure, this object
// should likely be discarded.
bool Init();
// Indicates whether the content in question exists in the local extension
// installation. This may be |false| if Init fails.
bool content_exists() const { return content_exists_; }
// These return whether we found valid verified_contents.json /
// computed_hashes.json files respectively. Note that both of these can be
// true but we still didn't find an entry for |relative_path_| in them.
bool have_verified_contents() const { return have_verified_contents_; }
bool have_computed_hashes() const { return have_computed_hashes_; }
// 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:
friend class base::RefCountedThreadSafe<ContentHashReader>;
virtual ~ContentHashReader();
enum InitStatus { NOT_INITIALIZED, SUCCESS, FAILURE };
std::string extension_id_;
base::Version extension_version_;
base::FilePath extension_root_;
base::FilePath relative_path_;
ContentVerifierKey key_;
InitStatus status_;
bool content_exists_;
bool have_verified_contents_;
bool have_computed_hashes_;
// The blocksize used for generating the hashes.
int block_size_;
scoped_ptr<VerifiedContents> verified_contents_;
std::vector<std::string> hashes_;
DISALLOW_COPY_AND_ASSIGN(ContentHashReader);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_
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