File: account_id.h

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// Copyright 2015 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_ACCOUNT_ID_ACCOUNT_ID_H_
#define COMPONENTS_ACCOUNT_ID_ACCOUNT_ID_H_

#include <stddef.h>

#include <functional>
#include <optional>
#include <ostream>
#include <string>
#include <string_view>

#include "base/component_export.h"
#include "google_apis/gaia/gaia_id.h"

enum class AccountType {
  // Unspecified account (eg. other domains)
  UNKNOWN,

  // aka Gaia account.
  GOOGLE,

  // ACTIVE_DIRECTORY account type was deprecated.
};

// Type that contains enough information to identify user.
//
// TODO(alemate): Rename functions and fields to reflect different types of
// accounts. (see crbug.com/672253)
class COMPONENT_EXPORT(COMPONENTS_ACCOUNT_ID) AccountId {
 public:
  // Creates an empty account id.
  //
  // Note: This constructor is public as it is required for mojo serialization
  // To create an AccountId object, prefer using the static FromXXXX methods or
  // the EmptyAccountId method when creating an empty account id.
  AccountId();

  AccountId(const AccountId& other);
  AccountId& operator=(const AccountId& other);

  // If any of the comparable AccountIds has AccountType == UNKNOWN then it
  // compares emails.
  // If both are not UNKNOWN and not equal then it returns false.
  // If AccountType == GOOGLE then it checks if either ids or emails are equal.
  bool operator==(const AccountId& other) const;
  bool operator<(const AccountId& right) const;

  bool empty() const;
  bool is_valid() const;
  void clear();

  AccountType GetAccountType() const;
  const GaiaId& GetGaiaId() const;
  // Users of AccountId should make no assumptions on the format of email.
  // I.e. it cannot be used as account identifier, because it is (in general)
  // non-comparable.
  const std::string& GetUserEmail() const;

  // Returns true if |GetAccountIdKey| would return valid key.
  bool HasAccountIdKey() const;
  // This returns prefixed some string that can be used as a storage key.
  // You should make no assumptions on the format of this string.
  const std::string GetAccountIdKey() const;

  void SetUserEmail(std::string_view email);

  static AccountId FromNonCanonicalEmail(std::string_view email,
                                         const GaiaId& gaia_id,
                                         AccountType account_type);
  // This method is to be used during transition period only.
  // AccountId with UNKNOWN AccountType;
  static AccountId FromUserEmail(std::string_view user_email);
  // This method is the preferred way to construct AccountId if you have
  // full account information.
  // AccountId with GOOGLE AccountType;
  static AccountId FromUserEmailGaiaId(std::string_view user_email,
                                       const GaiaId& gaia_id);

  // Translation functions between AccountType and std::string. Used for
  // serialization.
  static AccountType StringToAccountType(std::string_view account_type_string);
  static const char* AccountTypeToString(AccountType account_type);

  // These are (for now) unstable and cannot be used to store serialized data to
  // persistent storage. Only in-memory storage is safe.
  // Serialize() returns JSON dictionary,
  // Deserialize() restores AccountId after serialization.
  std::string Serialize() const;
  static std::optional<AccountId> Deserialize(std::string_view serialized);

 private:
  COMPONENT_EXPORT(COMPONENTS_ACCOUNT_ID)
  friend std::ostream& operator<<(std::ostream&, const AccountId&);

  AccountId(std::string_view user_email,
            AccountType account_type,
            const GaiaId& gaia_id);

  std::string user_email_;
  AccountType account_type_ = AccountType::UNKNOWN;
  // ID for AccountType::GOOGLE, empty otherwise.
  GaiaId gaia_id_;
};

// Overload << operator to allow logging of AccountIds.
COMPONENT_EXPORT(COMPONENTS_ACCOUNT_ID)
std::ostream& operator<<(std::ostream& stream, const AccountId& account_id);

// Returns a reference to a singleton.
COMPONENT_EXPORT(COMPONENTS_ACCOUNT_ID)
const AccountId& EmptyAccountId();

namespace std {

// Implement hashing of AccountId, so it can be used as a key in STL containers.
template <>
struct hash<AccountId> {
  COMPONENT_EXPORT(COMPONENTS_ACCOUNT_ID)
  std::size_t operator()(const AccountId& user_id) const;
};

}  // namespace std

#endif  // COMPONENTS_ACCOUNT_ID_ACCOUNT_ID_H_