Add anonymizer tool

components/feedback/anonymizer_tool.h

+// 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>
+
+namespace feedback {
+
+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;
+
+  std::string AnonymizeMACAddresses(const std::string& input);
+  std::string AnonymizeCustomPatterns(std::string input);
+  static std::string AnonymizeCustomPattern(
+      const std::string& input,
+      const std::string& 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_[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_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnonymizerTool);
+};
+
+}  // namespace feedback
+
+#endif  // COMPONENTS_FEEDBACK_ANONYMIZER_TOOL_H_