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// Copyright 2015 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 COMPONENTS_FEEDBACK_ANONYMIZER_TOOL_H_
#define COMPONENTS_FEEDBACK_ANONYMIZER_TOOL_H_
#include <map>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
namespace re2 {
class RE2;
}
namespace feedback {
struct CustomPatternWithoutContext {
// A string literal used in anonymized tests. Matches to the |pattern| are
// replaced with <|alias|: 1>, <|alias|: 2>, ...
const char* alias;
// A RE2 regexp with exactly one capture group. Matches will be replaced by
// the alias reference described above.
const char* pattern;
};
class AnonymizerTool {
public:
AnonymizerTool();
~AnonymizerTool();
// Returns an anonymized version of |input|. PII-sensitive data (such as MAC
// addresses) in |input| is replaced with unique identifiers.
std::string Anonymize(const std::string& input);
private:
friend class AnonymizerToolTest;
re2::RE2* GetRegExp(const std::string& pattern);
std::string AnonymizeMACAddresses(const std::string& input);
std::string AnonymizeCustomPatterns(std::string input);
std::string AnonymizeCustomPatternWithContext(
const std::string& input,
const std::string& pattern,
std::map<std::string, std::string>* identifier_space);
std::string AnonymizeCustomPatternWithoutContext(
const std::string& input,
const CustomPatternWithoutContext& pattern,
std::map<std::string, std::string>* identifier_space);
// Map of MAC addresses discovered in anonymized strings to anonymized
// representations. 11:22:33:44:55:66 gets anonymized to 11:22:33:00:00:01,
// where the first three bytes represent the manufacturer. The last three
// bytes are used to distinguish different MAC addresses and are incremented
// for each newly discovered MAC address.
std::map<std::string, std::string> mac_addresses_;
// Like mac addresses, identifiers in custom patterns are anonymized.
// custom_patterns_with_context_[i] contains a map of original identifier to
// anonymized identifier for custom pattern number i.
std::vector<std::map<std::string, std::string>> custom_patterns_with_context_;
std::vector<std::map<std::string, std::string>>
custom_patterns_without_context_;
// Cache to prevent the repeated compilation of the same regular expression
// pattern. Key is the string representation of the RegEx.
std::map<std::string, scoped_ptr<re2::RE2>> regexp_cache_;
DISALLOW_COPY_AND_ASSIGN(AnonymizerTool);
};
} // namespace feedback
#endif // COMPONENTS_FEEDBACK_ANONYMIZER_TOOL_H_
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