Role-Based Access Control (RBAC) is a fundamental component of our governance framework. It allows organizations to regulate access to network resources based on individual user roles, ensuring that only authorized personnel can perform sensitive operations or access critical data, thereby enhancing security and compliance.
This library can be integrated into a smart contract to ensure that only authorized personnel can access or perform specific actions, aligning with the governance and compliance frameworks of the DePIN system.
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;/** * @dev A library to provide governance and compliance functionalities in a DePIN framework. */libraryGovernanceAndCompliance {structRoleData {mapping(address=>bool) members;bytes32 adminRole; }structGovernanceData {mapping(bytes32=> RoleData) roles;bytes32 DEFAULT_ADMIN_ROLE; }eventRoleAdminChanged(bytes32indexed role, bytes32indexed previousAdminRole, bytes32indexed newAdminRole);eventRoleGranted(bytes32indexed role, addressindexed account, addressindexed sender);eventRoleRevoked(bytes32indexed role, addressindexed account, addressindexed sender);modifieronlyRole(GovernanceDatastorage gd,bytes32 role) {require(hasRole(gd, role, msg.sender),"GovernanceAndCompliance: Access denied"); _; }/** * @dev Initialize the default admin role. */functioninitialize(GovernanceDatastorage gd) internal { gd.DEFAULT_ADMIN_ROLE =0x00; }/** * @dev Grants a role to an account. * @param role The role to be granted. * @param account The account to which the role is granted. */ function grantRole(GovernanceData storage gd, bytes32 role, address account) internal onlyRole(gd, gd.roles[role].adminRole) {
if (!hasRole(gd, role, account)) { gd.roles[role].members[account] =true;emitRoleGranted(role, account, msg.sender); } }/** * @dev Revokes a role from an account. * @param role The role to be revoked. * @param account The account from which the role is revoked. */ function revokeRole(GovernanceData storage gd, bytes32 role, address account) internal onlyRole(gd, gd.roles[role].adminRole) {
if (hasRole(gd, role, account)) { gd.roles[role].members[account] =false;emitRoleRevoked(role, account, msg.sender); } }/** * @dev Checks if an account has a specific role. * @param role The role to check. * @param account The account to be checked. * @return bool True if the account has the role, false otherwise. */functionhasRole(GovernanceDatastorage gd,bytes32 role,address account) internalviewreturns (bool) {return gd.roles[role].members[account]; }/** * @dev Sets a new admin role for a given role. * @param role The role for which to set the new admin role. * @param adminRole The new admin role. */ function setRoleAdmin(GovernanceData storage gd, bytes32 role, bytes32 adminRole) internal onlyRole(gd, gd.roles[role].adminRole) {
bytes32 previousAdminRole = gd.roles[role].adminRole; gd.roles[role].adminRole = adminRole;emitRoleAdminChanged(role, previousAdminRole, adminRole); }}
Features
Manages permissions based on user roles.
Allows for the assignment and revocation of roles.
Checks if an account holds a specific role.
Emits events for role changes, enhancing transparency and traceability.
Example of Usage:
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;import"./DePINFW/GovernanceAndCompliance.sol";/** * @title DePINAssetManagement * @dev A comprehensive smart contract for managing assets in a Decentralized Physical Infrastructure Network (DePIN) with governance and compliance features.
*/contract DePINAssetManagement {usingGovernanceAndComplianceforGovernanceAndCompliance.GovernanceData; GovernanceAndCompliance.GovernanceData private governanceData;structAsset {string name;string location;uint256 value;address owner;bool isActive; }mapping(uint256=> Asset) private assets;uint256private assetCounter;eventAssetCreated(uint256indexed assetId, string name, addressindexed owner);eventAssetTransferred(uint256indexed assetId, addressindexed previousOwner, addressindexed newOwner);eventAssetUpdated(uint256indexed assetId, string name, string location, uint256 value);eventAssetDeactivated(uint256indexed assetId);modifieronlyAdmin() { require(governanceData.hasRole(governanceData.DEFAULT_ADMIN_ROLE, msg.sender), "DePINAssetManagement: Access denied, only admin");
_; }modifieronlyAssetOwner(uint256 assetId) {require(assets[assetId].owner == msg.sender,"DePINAssetManagement: Access denied, only asset owner"); _; }constructor(address initialAdmin) { governanceData.initialize(); governanceData.grantRole(governanceData.DEFAULT_ADMIN_ROLE, initialAdmin); }/** * @dev Function to create a new asset. * @param name Name of the asset. * @param location Location of the asset. * @param value Value of the asset. */ function createAsset(string memory name, string memory location, uint256 value) public onlyAdmin returns (uint256) {
assetCounter++; assets[assetCounter] =Asset(name, location, value, msg.sender,true);emitAssetCreated(assetCounter, name, msg.sender);return assetCounter; }/** * @dev Function to transfer ownership of an asset. * @param assetId ID of the asset. * @param newOwner Address of the new owner. */functiontransferAsset(uint256 assetId,address newOwner) publiconlyAssetOwner(assetId) {require(newOwner !=address(0),"DePINAssetManagement: New owner is the zero address");address previousOwner = assets[assetId].owner; assets[assetId].owner = newOwner;emitAssetTransferred(assetId, previousOwner, newOwner); }/** * @dev Function to update asset details. * @param assetId ID of the asset. * @param name New name of the asset. * @param location New location of the asset. * @param value New value of the asset. */ function updateAsset(uint256 assetId, string memory name, string memory location, uint256 value) public onlyAssetOwner(assetId) {
Asset storage asset = assets[assetId]; asset.name = name; asset.location = location; asset.value = value;emitAssetUpdated(assetId, name, location, value); }/** * @dev Function to deactivate an asset. * @param assetId ID of the asset. */functiondeactivateAsset(uint256 assetId) publiconlyAdmin { assets[assetId].isActive =false;emitAssetDeactivated(assetId); }/** * @dev Function to grant a role to an account. * @param role The role to be granted. * @param account The account to which the role is granted. */functiongrantRole(bytes32 role,address account) publiconlyAdmin { governanceData.grantRole(role, account); }/** * @dev Function to revoke a role from an account. * @param role The role to be revoked. * @param account The account from which the role is revoked. */functionrevokeRole(bytes32 role,address account) publiconlyAdmin { governanceData.revokeRole(role, account); }/** * @dev Function to set a new admin role for a given role. * @param role The role for which to set the new admin role. * @param adminRole The new admin role. */functionsetRoleAdmin(bytes32 role,bytes32 adminRole) publiconlyAdmin { governanceData.setRoleAdmin(role, adminRole); }/** * @dev Function to check if an account has a specific role. * @param role The role to check. * @param account The account to be checked. * @return bool True if the account has the role, false otherwise. */functionhasRole(bytes32 role,address account) publicviewreturns (bool) {return governanceData.hasRole(role, account); }/** * @dev Function to get asset details. * @param assetId ID of the asset. * @return Asset details including name, location, value, owner, and status. */ function getAssetDetails(uint256 assetId) public view returns (string memory, string memory, uint256, address, bool) {
Asset memory asset = assets[assetId];return (asset.name, asset.location, asset.value, asset.owner, asset.isActive); }/** * @dev Function to get the total number of assets. * @return uint256 Total number of assets. */functiongetTotalAssets() publicviewreturns (uint256) {return assetCounter; }}
Explanation
Governance and Compliance Integration: The DePINAssetManagement contract uses the GovernanceAndCompliance library to handle role-based access control, ensuring only authorized users can perform specific actions.
Asset Management: The contract includes functions to create, transfer, update, and deactivate assets, maintaining a comprehensive record of asset ownership and status.
Events: Events are emitted for significant actions like asset creation, transfer, updates, and deactivation, enhancing transparency and enabling easy tracking of changes.
Modifiers: Modifiers are used to enforce role-based access control and ensure only authorized users can execute certain functions.
Ownership and Administration: The contract includes functions to manage roles, allowing for dynamic administration and ensuring compliance with governance protocols.
This contract demonstrates a robust implementation for managing physical infrastructure assets within a DePIN framework, ensuring governance and compliance are maintained through the use of the provided library.