Access Control

Contract module that allows children to implement role-based access control mechanisms. This is a lightweight version that doesn't allow enumerating role members except through off-chain means by accessing the contract event logs. Some applications may benefit from on-chain enumerability, for those cases see {AccessControlEnumerable}. Roles are referred to by their bytes32 identifier. These should be exposed in the external API and be unique. The best way to achieve this is by using public constant hash digests: bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); Roles can be used to represent a set of permissions. To restrict access to a function call, use {hasRole}: function foo() public { require(hasRole(MY_ROLE, msg.sender)); ... } Roles can be granted and revoked dynamically via the {grantRole} and {revokeRole} functions. Each role has an associated admin role, and only accounts that have a role's admin role can call {grantRole} and {revokeRole}. By default, the admin role for all roles is DEFAULT_ADMIN_ROLE, which means that only accounts with this role will be able to grant or revoke other roles. More complex role relationships can be created by using {_setRoleAdmin}. WARNING: The DEFAULT_ADMIN_ROLE is also its own admin: it has permission to grant and revoke this role. Extra precautions should be taken to secure accounts that have been granted it.

Methods

DEFAULT_ADMIN_ROLE

function DEFAULT_ADMIN_ROLE() external view returns (bytes32)

Returns

Name	Type	Description
_0	bytes32	undefined

getRoleAdmin

function getRoleAdmin(bytes32 role) external view returns (bytes32)

Returns the admin role that controls role. See {grantRole} and {revokeRole}. To change a role's admin, use {_setRoleAdmin}.

Parameters

Name	Type	Description
role	bytes32	undefined

Returns

Name	Type	Description
_0	bytes32	undefined

grantRole

function grantRole(bytes32 role, address account) external nonpayable

Grants role to account. If account had not been already granted role, emits a {RoleGranted} event. Requirements: - the caller must have role's admin role.

Parameters

Name	Type	Description
role	bytes32	undefined
account	address	undefined

hasRole

function hasRole(bytes32 role, address account) external view returns (bool)

Returns true if account has been granted role.

Parameters

Name	Type	Description
role	bytes32	undefined
account	address	undefined

Returns

Name	Type	Description
_0	bool	undefined

renounceRole

function renounceRole(bytes32 role, address account) external nonpayable

Revokes role from the calling account. Roles are often managed via {grantRole} and {revokeRole}: this function's purpose is to provide a mechanism for accounts to lose their privileges if they are compromised (such as when a trusted device is misplaced). If the calling account had been granted role, emits a {RoleRevoked} event. Requirements: - the caller must be account.

Parameters

Name	Type	Description
role	bytes32	undefined
account	address	undefined

revokeRole

function revokeRole(bytes32 role, address account) external nonpayable

Revokes role from account. If account had been granted role, emits a {RoleRevoked} event. Requirements: - the caller must have role's admin role.

Parameters

Name	Type	Description
role	bytes32	undefined
account	address	undefined

supportsInterface

function supportsInterface(bytes4 interfaceId) external view returns (bool)

See {IERC165-supportsInterface}.

Parameters

Name	Type	Description
interfaceId	bytes4	undefined

Returns

Name	Type	Description
_0	bool	undefined

Events

RoleAdminChanged

event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole)

Parameters

Name	Type	Description
role indexed	bytes32	undefined
previousAdminRole indexed	bytes32	undefined
newAdminRole indexed	bytes32	undefined

RoleGranted

event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender)

Parameters

Name	Type	Description
role indexed	bytes32	undefined
account indexed	address	undefined
sender indexed	address	undefined

RoleRevoked

event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender)

Parameters

Name	Type	Description
role indexed	bytes32	undefined
account indexed	address	undefined
sender indexed	address	undefined