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// Copyright 2024 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_PLUS_ADDRESSES_PLUS_ADDRESS_BLOCKLIST_DATA_H_
#define COMPONENTS_PLUS_ADDRESSES_PLUS_ADDRESS_BLOCKLIST_DATA_H_
#include <string>
#include "base/sequence_checker.h"
#include "third_party/re2/src/re2/re2.h"
namespace plus_addresses {
// Possible states of parsing the response body when a fetch completes in
// `PlusAddressBlocklistData`.
//
// Needs to be kept in sync with `PlusAddressBlocklistDataParsingResult` in
// tools/metrics/histograms/metadata/plus_addresses/enums.xml.
//
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class PlusAddressBlocklistDataParsingResult {
// The response body was empty.
kEmptyResponse = 0,
// The response body could not be parsed as
// `CompactPlusAddressBlockedFacets`
// proto message.
kParsingError = 1,
// Parsing was successful.
kSuccess = 2,
kMaxValue = kSuccess
};
// This holds the set of patterns that define the set of facets for which Plus
// Addresses should not be offered. The data to populate it is read from the
// Component Updater, which fetches it periodically from Google to get the
// most up-to-date patterns.
class PlusAddressBlocklistData final {
public:
static PlusAddressBlocklistData& GetInstance();
PlusAddressBlocklistData();
PlusAddressBlocklistData(const PlusAddressBlocklistData&) = delete;
PlusAddressBlocklistData& operator=(const PlusAddressBlocklistData&) = delete;
~PlusAddressBlocklistData();
// Updates the internal list from a binary proto fetched from the network.
// This can be called multiple times with new protos. Returns `true` if the
// parsing process was successful, `false` otherwise.
bool PopulateDataFromComponent(const std::string& binary_pb);
// Returns a regular expression that specifies which domains should not have
// Plus Addresses offered on them.
const re2::RE2* GetExclusionPattern() const;
// Returns a regular expression that specifies which domains should be exempt
// from a blocklist rule.
const re2::RE2* GetExceptionPattern() const;
private:
SEQUENCE_CHECKER(sequence_checker_);
std::unique_ptr<re2::RE2> exclusion_pattern_
GUARDED_BY_CONTEXT(sequence_checker_);
std::unique_ptr<re2::RE2> exception_pattern_
GUARDED_BY_CONTEXT(sequence_checker_);
};
} // namespace plus_addresses
#endif // COMPONENTS_PLUS_ADDRESSES_PLUS_ADDRESS_BLOCKLIST_DATA_H_
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