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| 1 | +// SPDX-License-Identifier: Apache-2.0 |
| 2 | +pragma solidity ^0.8.0; |
| 3 | + |
| 4 | +import "./PermissionsEnumerableStorage.sol"; |
| 5 | +import "./PermissionsLogic.sol"; |
| 6 | + |
| 7 | +/** |
| 8 | + * @title PermissionsEnumerable |
| 9 | + * @dev This contracts provides extending-contracts with role-based access control mechanisms. |
| 10 | + * Also provides interfaces to view all members with a given role, and total count of members. |
| 11 | + */ |
| 12 | +contract PermissionsEnumerableLogic is IPermissionsEnumerable, PermissionsLogic { |
| 13 | + /** |
| 14 | + * @notice Returns the role-member from a list of members for a role, |
| 15 | + * at a given index. |
| 16 | + * @dev Returns `member` who has `role`, at `index` of role-members list. |
| 17 | + * See struct {RoleMembers}, and mapping {roleMembers} |
| 18 | + * |
| 19 | + * @param role keccak256 hash of the role. e.g. keccak256("TRANSFER_ROLE") |
| 20 | + * @param index Index in list of current members for the role. |
| 21 | + * |
| 22 | + * @return member Address of account that has `role` |
| 23 | + */ |
| 24 | + function getRoleMember(bytes32 role, uint256 index) external view override returns (address member) { |
| 25 | + PermissionsEnumerableStorage.Data storage data = PermissionsEnumerableStorage.permissionsEnumerableStorage(); |
| 26 | + uint256 currentIndex = data.roleMembers[role].index; |
| 27 | + uint256 check; |
| 28 | + |
| 29 | + for (uint256 i = 0; i < currentIndex; i += 1) { |
| 30 | + if (data.roleMembers[role].members[i] != address(0)) { |
| 31 | + if (check == index) { |
| 32 | + member = data.roleMembers[role].members[i]; |
| 33 | + return member; |
| 34 | + } |
| 35 | + check += 1; |
| 36 | + } else if (hasRole(role, address(0)) && i == data.roleMembers[role].indexOf[address(0)]) { |
| 37 | + check += 1; |
| 38 | + } |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + /** |
| 43 | + * @notice Returns total number of accounts that have a role. |
| 44 | + * @dev Returns `count` of accounts that have `role`. |
| 45 | + * See struct {RoleMembers}, and mapping {roleMembers} |
| 46 | + * |
| 47 | + * @param role keccak256 hash of the role. e.g. keccak256("TRANSFER_ROLE") |
| 48 | + * |
| 49 | + * @return count Total number of accounts that have `role` |
| 50 | + */ |
| 51 | + function getRoleMemberCount(bytes32 role) external view override returns (uint256 count) { |
| 52 | + PermissionsEnumerableStorage.Data storage data = PermissionsEnumerableStorage.permissionsEnumerableStorage(); |
| 53 | + uint256 currentIndex = data.roleMembers[role].index; |
| 54 | + |
| 55 | + for (uint256 i = 0; i < currentIndex; i += 1) { |
| 56 | + if (data.roleMembers[role].members[i] != address(0)) { |
| 57 | + count += 1; |
| 58 | + } |
| 59 | + } |
| 60 | + if (hasRole(role, address(0))) { |
| 61 | + count += 1; |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + /// @dev Revokes `role` from `account`, and removes `account` from {roleMembers} |
| 66 | + /// See {_removeMember} |
| 67 | + function _revokeRole(bytes32 role, address account) internal override { |
| 68 | + super._revokeRole(role, account); |
| 69 | + _removeMember(role, account); |
| 70 | + } |
| 71 | + |
| 72 | + /// @dev Grants `role` to `account`, and adds `account` to {roleMembers} |
| 73 | + /// See {_addMember} |
| 74 | + function _setupRole(bytes32 role, address account) internal override { |
| 75 | + super._setupRole(role, account); |
| 76 | + _addMember(role, account); |
| 77 | + } |
| 78 | + |
| 79 | + /// @dev adds `account` to {roleMembers}, for `role` |
| 80 | + function _addMember(bytes32 role, address account) internal { |
| 81 | + PermissionsEnumerableStorage.Data storage data = PermissionsEnumerableStorage.permissionsEnumerableStorage(); |
| 82 | + uint256 idx = data.roleMembers[role].index; |
| 83 | + data.roleMembers[role].index += 1; |
| 84 | + |
| 85 | + data.roleMembers[role].members[idx] = account; |
| 86 | + data.roleMembers[role].indexOf[account] = idx; |
| 87 | + } |
| 88 | + |
| 89 | + /// @dev removes `account` from {roleMembers}, for `role` |
| 90 | + function _removeMember(bytes32 role, address account) internal { |
| 91 | + PermissionsEnumerableStorage.Data storage data = PermissionsEnumerableStorage.permissionsEnumerableStorage(); |
| 92 | + uint256 idx = data.roleMembers[role].indexOf[account]; |
| 93 | + |
| 94 | + delete data.roleMembers[role].members[idx]; |
| 95 | + delete data.roleMembers[role].indexOf[account]; |
| 96 | + } |
| 97 | +} |
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