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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OPTIMIZATION_GUIDE_CORE_MODEL_EXECUTION_REDACTOR_H_
#define COMPONENTS_OPTIMIZATION_GUIDE_CORE_MODEL_EXECUTION_REDACTOR_H_
#include <memory>
#include <string>
#include <vector>
#include "components/optimization_guide/proto/redaction.pb.h"
namespace re2 {
class RE2;
} // namespace re2
namespace optimization_guide {
enum class RedactResult {
// Used if there was at least one rule that matched with a behavior of reject.
kReject,
// No rules with reject matched.
kContinue,
};
// Used to redact (or reject) text.
class Redactor final {
public:
Redactor(Redactor&& rules);
~Redactor();
// Construct a Redactor that implements the RedactRules.
static Redactor FromProto(const proto::RedactRules& proto_rules);
// Redacts (or rejects) the applicable text in`output`. `input` is the string
// regexes of type REDACT_IF_ONLY_IN_OUTPUT checks.
RedactResult Redact(const std::string& input, std::string& output) const;
private:
enum class Behavior {
kReject = 1,
kRedactIfOnlyInOutput = 2,
kRedactAlways = 3,
};
// A validated and compiled proto::RedactRule, see it for details.
class Rule final {
public:
Rule(std::unique_ptr<re2::RE2> re,
Behavior behavior,
std::string replacement_string,
int matching_group,
size_t min_pattern_length,
size_t max_pattern_length);
Rule(Rule&&);
~Rule();
// Apply this rule, redacting `output`.
RedactResult Process(const std::string& input, std::string& output) const;
private:
// Returns true if a match should be considered valid.
bool IsValidMatch(const std::string_view& match) const;
std::string GetReplacementString(std::string_view match) const;
std::unique_ptr<re2::RE2> re_;
Behavior behavior_;
std::string replacement_string_;
int matching_group_;
size_t min_pattern_length_;
size_t max_pattern_length_;
};
explicit Redactor(std::vector<Rule>&& rules);
std::vector<Rule> rules_;
};
} // namespace optimization_guide
#endif // COMPONENTS_OPTIMIZATION_GUIDE_CORE_MODEL_EXECUTION_REDACTOR_H_
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