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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 model
import (
"errors"
"strings"
"github.com/casbin/casbin/v2/log"
"github.com/casbin/casbin/v2/rbac"
)
// Assertion represents an expression in a section of the model.
// For example: r = sub, obj, act.
type Assertion struct {
Key string
Value string
Tokens []string
ParamsTokens []string
Policy [][]string
PolicyMap map[string]int
RM rbac.RoleManager
CondRM rbac.ConditionalRoleManager
FieldIndexMap map[string]int
logger log.Logger
}
func (ast *Assertion) buildIncrementalRoleLinks(rm rbac.RoleManager, op PolicyOp, rules [][]string) error {
ast.RM = rm
count := strings.Count(ast.Value, "_")
if count < 2 {
return errors.New("the number of \"_\" in role definition should be at least 2")
}
for _, rule := range rules {
if len(rule) < count {
return errors.New("grouping policy elements do not meet role definition")
}
if len(rule) > count {
rule = rule[:count]
}
switch op {
case PolicyAdd:
err := rm.AddLink(rule[0], rule[1], rule[2:]...)
if err != nil {
return err
}
case PolicyRemove:
err := rm.DeleteLink(rule[0], rule[1], rule[2:]...)
if err != nil {
return err
}
}
}
return nil
}
func (ast *Assertion) buildRoleLinks(rm rbac.RoleManager) error {
ast.RM = rm
count := strings.Count(ast.Value, "_")
if count < 2 {
return errors.New("the number of \"_\" in role definition should be at least 2")
}
for _, rule := range ast.Policy {
if len(rule) < count {
return errors.New("grouping policy elements do not meet role definition")
}
if len(rule) > count {
rule = rule[:count]
}
err := ast.RM.AddLink(rule[0], rule[1], rule[2:]...)
if err != nil {
return err
}
}
return nil
}
func (ast *Assertion) buildIncrementalConditionalRoleLinks(condRM rbac.ConditionalRoleManager, op PolicyOp, rules [][]string) error {
ast.CondRM = condRM
count := strings.Count(ast.Value, "_")
if count < 2 {
return errors.New("the number of \"_\" in role definition should be at least 2")
}
for _, rule := range rules {
if len(rule) < count {
return errors.New("grouping policy elements do not meet role definition")
}
if len(rule) > count {
rule = rule[:count]
}
var err error
domainRule := rule[2:len(ast.Tokens)]
switch op {
case PolicyAdd:
err = ast.addConditionalRoleLink(rule, domainRule)
case PolicyRemove:
err = ast.CondRM.DeleteLink(rule[0], rule[1], rule[2:]...)
}
if err != nil {
return err
}
}
return nil
}
func (ast *Assertion) buildConditionalRoleLinks(condRM rbac.ConditionalRoleManager) error {
ast.CondRM = condRM
count := strings.Count(ast.Value, "_")
if count < 2 {
return errors.New("the number of \"_\" in role definition should be at least 2")
}
for _, rule := range ast.Policy {
if len(rule) < count {
return errors.New("grouping policy elements do not meet role definition")
}
if len(rule) > count {
rule = rule[:count]
}
domainRule := rule[2:len(ast.Tokens)]
err := ast.addConditionalRoleLink(rule, domainRule)
if err != nil {
return err
}
}
return nil
}
// addConditionalRoleLink adds Link to rbac.ConditionalRoleManager and sets the parameters for LinkConditionFunc.
func (ast *Assertion) addConditionalRoleLink(rule []string, domainRule []string) error {
var err error
if len(domainRule) == 0 {
err = ast.CondRM.AddLink(rule[0], rule[1])
if err == nil {
ast.CondRM.SetLinkConditionFuncParams(rule[0], rule[1], rule[len(ast.Tokens):]...)
}
} else {
domain := domainRule[0]
err = ast.CondRM.AddLink(rule[0], rule[1], domain)
if err == nil {
ast.CondRM.SetDomainLinkConditionFuncParams(rule[0], rule[1], domain, rule[len(ast.Tokens):]...)
}
}
return err
}
func (ast *Assertion) setLogger(logger log.Logger) {
ast.logger = logger
}
func (ast *Assertion) copy() *Assertion {
tokens := append([]string(nil), ast.Tokens...)
policy := make([][]string, len(ast.Policy))
for i, p := range ast.Policy {
policy[i] = append(policy[i], p...)
}
policyMap := make(map[string]int)
for k, v := range ast.PolicyMap {
policyMap[k] = v
}
newAst := &Assertion{
Key: ast.Key,
Value: ast.Value,
PolicyMap: policyMap,
Tokens: tokens,
Policy: policy,
FieldIndexMap: ast.FieldIndexMap,
}
return newAst
}
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