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// Copyright 2016 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_AUTOFILL_CORE_COMMON_SIGNATURES_H_
#define COMPONENTS_AUTOFILL_CORE_COMMON_SIGNATURES_H_
#include <stddef.h>
#include <stdint.h>
#include <string_view>
#include "base/types/id_type.h"
#include "components/autofill/core/common/mojom/autofill_types.mojom-shared.h"
namespace autofill {
class FormData;
class FormFieldData;
namespace internal {
using FormSignatureType = ::base::IdTypeU64<class FormSignatureMarker>;
using FieldSignatureType = ::base::IdTypeU32<class FieldSignatureMarker>;
} // namespace internal
// The below strong aliases are defined as subclasses instead of typedefs in
// order to avoid having to define out-of-line constructors in all structs that
// contain signatures.
class FormSignature : public internal::FormSignatureType {
using internal::FormSignatureType::IdType;
};
class FieldSignature : public internal::FieldSignatureType {
using internal::FieldSignatureType::IdType;
};
// Calculates form signature based on |form_data|.
FormSignature CalculateFormSignature(const FormData& form_data);
// Returns a generic form signature which is equivalent to alternative form
// signature for forms with more than 2 fields. For forms with 2 fields or
// less, it is more stable as it doesn't depend on url path, query or ref.
FormSignature CalculateStructuralFormSignature(const FormData& form_data);
// Returns a more generic form signature than CalculateFormSignature. It is used
// in cases where the web form has an unstable form signature (a random
// signature due to changing form or field names at each page load).
FormSignature CalculateAlternativeFormSignature(const FormData& form_data);
// Calculates field signature based on |field_name| and |field_type|.
FieldSignature CalculateFieldSignatureByNameAndType(
std::u16string_view field_name,
mojom::FormControlType field_type);
// Calculates field signature based on |field_data|. This function is a proxy to
// |CalculateFieldSignatureByNameAndType|.
FieldSignature CalculateFieldSignatureForField(const FormFieldData& field_data);
// Returns 64-bit hash of the string.
uint64_t StrToHash64Bit(std::string_view str);
// Returns 32-bit hash of the string.
uint32_t StrToHash32Bit(std::string_view str);
// Returns 3-bit hash of the string.
int32_t StrToHash3Bit(std::string_view str);
// Returns 3-bit hash of a UTF-16 string.
int32_t StrToHash3Bit(std::u16string_view str);
// Reduce FieldSignature space (in UKM) to a small range for privacy reasons.
int64_t HashFormSignature(FormSignature form_signature);
// Reduce FieldSignature space (in UKM) to a small range for privacy reasons.
int64_t HashFieldSignature(FieldSignature field_signature);
} // namespace autofill
#endif // COMPONENTS_AUTOFILL_CORE_COMMON_SIGNATURES_H_
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