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method_node.go
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method_node.go
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// Copyright 2021 Converter Systems LLC. All rights reserved.
package server
import (
"sync"
"github.com/awcullen/opcua/ua"
)
// MethodNode is a Node class that describes the syntax of a object's Method.
type MethodNode struct {
sync.RWMutex
server *Server
nodeID ua.NodeID
nodeClass ua.NodeClass
browseName ua.QualifiedName
displayName ua.LocalizedText
description ua.LocalizedText
rolePermissions []ua.RolePermissionType
accessRestrictions uint16
references []ua.Reference
executable bool
callMethodHandler func(*Session, ua.CallMethodRequest) ua.CallMethodResult
}
var _ Node = (*MethodNode)(nil)
// NewMethodNode constructs a new MethodNode.
func NewMethodNode(server *Server, nodeID ua.NodeID, browseName ua.QualifiedName, displayName ua.LocalizedText, description ua.LocalizedText, rolePermissions []ua.RolePermissionType, references []ua.Reference, executable bool) *MethodNode {
return &MethodNode{
server: server,
nodeID: nodeID,
nodeClass: ua.NodeClassMethod,
browseName: browseName,
displayName: displayName,
description: description,
rolePermissions: rolePermissions,
accessRestrictions: 0,
references: references,
executable: executable,
}
}
// NodeID returns the NodeID attribute of this node.
func (n *MethodNode) NodeID() ua.NodeID {
return n.nodeID
}
// NodeClass returns the NodeClass attribute of this node.
func (n *MethodNode) NodeClass() ua.NodeClass {
return n.nodeClass
}
// BrowseName returns the BrowseName attribute of this node.
func (n *MethodNode) BrowseName() ua.QualifiedName {
return n.browseName
}
// DisplayName returns the DisplayName attribute of this node.
func (n *MethodNode) DisplayName() ua.LocalizedText {
return n.displayName
}
// Description returns the Description attribute of this node.
func (n *MethodNode) Description() ua.LocalizedText {
return n.description
}
// RolePermissions returns the RolePermissions attribute of this node.
func (n *MethodNode) RolePermissions() []ua.RolePermissionType {
return n.rolePermissions
}
// UserRolePermissions returns the RolePermissions attribute of this node for the current user.
func (n *MethodNode) UserRolePermissions(userIdentity any) []ua.RolePermissionType {
filteredPermissions := []ua.RolePermissionType{}
roles, err := n.server.GetRoles(userIdentity, "", "")
if err != nil {
return filteredPermissions
}
rolePermissions := n.RolePermissions()
if rolePermissions == nil {
rolePermissions = n.server.RolePermissions()
}
for _, rp := range rolePermissions {
for _, r := range roles {
if rp.RoleID == r {
filteredPermissions = append(filteredPermissions, rp)
}
}
}
return filteredPermissions
}
// References returns the References of this node.
func (n *MethodNode) References() []ua.Reference {
n.RLock()
defer n.RUnlock()
return n.references
}
// SetReferences sets the References of the Variable.
func (n *MethodNode) SetReferences(value []ua.Reference) {
n.Lock()
defer n.Unlock()
n.references = value
}
// Executable returns the Executable attribute of this node.
func (n *MethodNode) Executable() bool {
return n.executable
}
// UserExecutable returns the UserExecutable attribute of this node.
func (n *MethodNode) UserExecutable(userIdentity any) bool {
if !n.executable {
return false
}
roles, err := n.server.GetRoles(userIdentity, "", "")
if err != nil {
return false
}
rolePermissions := n.RolePermissions()
if rolePermissions == nil {
rolePermissions = n.server.RolePermissions()
}
for _, role := range roles {
for _, rp := range rolePermissions {
if rp.RoleID == role && rp.Permissions&ua.PermissionTypeCall != 0 {
return true
}
}
}
return false
}
// SetCallMethodHandler sets the CallMethod of the Variable.
func (n *MethodNode) SetCallMethodHandler(value func(*Session, ua.CallMethodRequest) ua.CallMethodResult) {
n.Lock()
defer n.Unlock()
n.callMethodHandler = value
}
// IsAttributeIDValid returns true if attributeId is supported for the node.
func (n *MethodNode) IsAttributeIDValid(attributeID uint32) bool {
switch attributeID {
case ua.AttributeIDNodeID, ua.AttributeIDNodeClass, ua.AttributeIDBrowseName,
ua.AttributeIDDisplayName, ua.AttributeIDDescription, ua.AttributeIDRolePermissions,
ua.AttributeIDUserRolePermissions, ua.AttributeIDExecutable, ua.AttributeIDUserExecutable:
return true
default:
return false
}
}