forked from casbin/casbin
/
role_manager.go
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/
role_manager.go
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// Copyright 2017 The casbin Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package defaultrolemanager
import (
"github.com/casbin/casbin/rbac"
"github.com/casbin/casbin/util"
)
type RoleManager struct {
allRoles map[string]*Role
maxHierarchyLevel int
}
// NewRoleManager is the constructor for creating an instance of the
// default RoleManager implementation.
func NewRoleManager(maxHierarchyLevel int) rbac.RoleManager {
rm := RoleManager{}
rm.allRoles = make(map[string]*Role)
rm.maxHierarchyLevel = maxHierarchyLevel
return &rm
}
func (rm *RoleManager) hasRole(name string) bool {
_, ok := rm.allRoles[name]
return ok
}
func (rm *RoleManager) createRole(name string) *Role {
if !rm.hasRole(name) {
rm.allRoles[name] = newRole(name)
}
return rm.allRoles[name]
}
// Clear clears all stored data and resets the role manager to the initial state.
func (rm *RoleManager) Clear() {
rm.allRoles = make(map[string]*Role)
}
// AddLink adds the inheritance link between role: name1 and role: name2.
// aka role: name1 inherits role: name2.
// domain is a prefix to the roles.
func (rm *RoleManager) AddLink(name1 string, name2 string, domain ...string) {
if len(domain) == 1 {
name1 = domain[0] + "::" + name1
name2 = domain[0] + "::" + name2
}
role1 := rm.createRole(name1)
role2 := rm.createRole(name2)
role1.addRole(role2)
}
// DeleteLink deletes the inheritance link between role: name1 and role: name2.
// aka role: name1 does not inherit role: name2 any more.
// domain is a prefix to the roles.
func (rm *RoleManager) DeleteLink(name1 string, name2 string, domain ...string) {
if len(domain) == 1 {
name1 = domain[0] + "::" + name1
name2 = domain[0] + "::" + name2
}
if !rm.hasRole(name1) || !rm.hasRole(name2) {
return
}
role1 := rm.createRole(name1)
role2 := rm.createRole(name2)
role1.deleteRole(role2)
}
// HasLink determines whether role: name1 inherits role: name2.
// domain is a prefix to the roles.
func (rm *RoleManager) HasLink(name1 string, name2 string, domain ...string) bool {
if len(domain) == 1 {
name1 = domain[0] + "::" + name1
name2 = domain[0] + "::" + name2
}
if name1 == name2 {
return true
}
if !rm.hasRole(name1) || !rm.hasRole(name2) {
return false
}
role1 := rm.createRole(name1)
return role1.hasRole(name2, rm.maxHierarchyLevel)
}
// GetRoles gets the roles that a subject inherits.
// domain is a prefix to the roles.
func (rm *RoleManager) GetRoles(name string, domain ...string) []string {
if len(domain) == 1 {
name = domain[0] + "::" + name
}
if !rm.hasRole(name) {
return nil
}
roles := rm.createRole(name).getRoles()
if len(domain) == 1 {
for i := range roles {
roles[i] = roles[i][len(domain[0])+2:]
}
}
return roles
}
// GetUsers gets the users that inherits a subject.
// domain is an unreferenced parameter here, may be used in other implementations.
func (rm *RoleManager) GetUsers(name string, domain ...string) []string {
if !rm.hasRole(name) {
return nil
}
names := []string{}
for _, role := range rm.allRoles {
if role.hasDirectRole(name) {
names = append(names, role.name)
}
}
return names
}
// PrintRoles prints all the roles to log.
func (rm *RoleManager) PrintRoles() {
for _, role := range rm.allRoles {
util.LogPrint(role.toString())
}
}
// Role represents the data structure for a role in RBAC.
type Role struct {
name string
roles []*Role
}
func newRole(name string) *Role {
r := Role{}
r.name = name
return &r
}
func (r *Role) addRole(role *Role) {
for _, rr := range r.roles {
if rr.name == role.name {
return
}
}
r.roles = append(r.roles, role)
}
func (r *Role) deleteRole(role *Role) {
for i, rr := range r.roles {
if rr.name == role.name {
r.roles = append(r.roles[:i], r.roles[i+1:]...)
return
}
}
}
func (r *Role) hasRole(name string, hierarchyLevel int) bool {
if r.name == name {
return true
}
if hierarchyLevel <= 0 {
return false
}
for _, role := range r.roles {
if role.hasRole(name, hierarchyLevel-1) {
return true
}
}
return false
}
func (r *Role) hasDirectRole(name string) bool {
for _, role := range r.roles {
if role.name == name {
return true
}
}
return false
}
func (r *Role) toString() string {
names := ""
for i, role := range r.roles {
if i == 0 {
names += role.name
} else {
names += ", " + role.name
}
}
return r.name + " < " + names
}
func (r *Role) getRoles() []string {
names := []string{}
for _, role := range r.roles {
names = append(names, role.name)
}
return names
}