为企业应用程序实施动态 RBAC 系统 - 简化

import java.time.LocalDateTime;
import java.util.List;

@Service
@Transactional
public class AccessControlService {

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private RoleRepository roleRepository;

    @Autowired
    private ModulePermissionRepository modulePermissionRepository;

    @Autowired
    private RolePermissionRepository rolePermissionRepository;

    @Autowired
    private UserRoleRepository userRoleRepository;

    @Autowired
    private PolicyRepository policyRepository;

    @Autowired
    private UserPolicyRepository userPolicyRepository;

    @Autowired
    private RolePolicyRepository rolePolicyRepository;

    @Autowired
    private PolicyConditionRepository policyConditionRepository;

    @Autowired
    private ContextualPermissionRepository contextualPermissionRepository;

    @Autowired
    private TemporalConstraintRepository temporalConstraintRepository;

    @Autowired
    private DelegationRepository delegationRepository;

    public boolean hasAccess(String username, Long moduleId, String permissionType) {
        // Fetch user
        User user = userRepository.findByUsername(username);
        if (user == null) {
            return false;
        }

        // Check if user has any delegations
        boolean hasDelegatedAccess = checkDelegatedAccess(user.getUserId(), moduleId, permissionType);
        if (hasDelegatedAccess) {
            return true;
        }

        // Check if user has direct access via roles
        List<UserRole> userRoles = userRoleRepository.findByUserId(user.getUserId());
        for (UserRole userRole : userRoles) {
            List<RolePermission> rolePermissions = rolePermissionRepository.findByRoleId(userRole.getRoleId());
            for (RolePermission rolePermission : rolePermissions) {
                ModulePermission modulePermission = modulePermissionRepository.findById(rolePermission.getModulePermissionId()).orElse(null);
                if (modulePermission != null && modulePermission.getModuleId().equals(moduleId) && modulePermission.getPermissionType().equals(permissionType)) {
                    // Check if role has any associated policies
                    if (hasPolicyAccess(user.getUserId(), moduleId, permissionType, modulePermission.getModuleId())) {
                        return true;
                    }
                }
            }
        }

        return false;
    }

    private boolean checkDelegatedAccess(Long userId, Long moduleId, String permissionType) {
        List<Delegation> delegations = delegationRepository.findByDelegateUserId(userId);
        LocalDateTime now = LocalDateTime.now();
        for (Delegation delegation : delegations) {
            // Check if delegation is expired
            if (delegation.getExpirationDate() != null && delegation.getExpirationDate().isBefore(now)) {
                continue;
            }

            List<RolePermission> rolePermissions = rolePermissionRepository.findByRoleId(delegation.getRoleId());
            for (RolePermission rolePermission : rolePermissions) {
                ModulePermission modulePermission = modulePermissionRepository.findById(rolePermission.getModulePermissionId()).orElse(null);
                if (modulePermission != null && modulePermission.getModuleId().equals(moduleId) && modulePermission.getPermissionType().equals(permissionType)) {
                    return true;
                }
            }
        }
        return false;
    }

    private boolean hasPolicyAccess(Long userId, Long moduleId, String permissionType, Long modulePermissionId) {
        // Check policies assigned directly to the user
        List<UserPolicy> userPolicies = userPolicyRepository.findByUserId(userId);
        for (UserPolicy userPolicy : userPolicies) {
            if (isPolicyValid(userPolicy.getPolicyId(), moduleId, permissionType)) {
                return true;
            }
        }

        // Check policies assigned to roles
        List<UserRole> userRoles = userRoleRepository.findByUserId(userId);
        for (UserRole userRole : userRoles) {
            List<RolePolicy> rolePolicies = rolePolicyRepository.findByRoleId(userRole.getRoleId());
            for (RolePolicy rolePolicy : rolePolicies) {
                if (isPolicyValid(rolePolicy.getPolicyId(), moduleId, permissionType)) {
                    return true;
                }
            }
        }

        return false;
    }

    private boolean isPolicyValid(Long policyId, Long moduleId, String permissionType) {
        // Check policy conditions
        List<PolicyCondition> conditions = policyConditionRepository.findByPolicyId(policyId);
        for (PolicyCondition condition : conditions) {
            // Add logic to evaluate conditions based on conditionType and conditionValue
            // e.g., Check if context or attribute matches the condition
        }

        // Check contextual permissions
        List<ContextualPermission> contextualPermissions = contextualPermissionRepository.findByPolicyId(policyId);
        for (ContextualPermission contextualPermission : contextualPermissions) {
            // Add logic to evaluate contextual permissions
            // e.g., Check if current context matches the contextualPermission
        }

        // Check temporal constraints
        List<TemporalConstraint> temporalConstraints = temporalConstraintRepository.findByPolicyId(policyId);
        for (TemporalConstraint temporalConstraint : temporalConstraints) {
            LocalDateTime now = LocalDateTime.now();
            if (now.isBefore(temporalConstraint.getStartTime()) || now.isAfter(temporalConstraint.getEndTime())) {
                return false;
            }
        }

        return true;
    }
}