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package casbin
import (
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
)
// DistributedEnforcer wraps SyncedEnforcer for dispatcher.
type DistributedEnforcer struct {
*SyncedEnforcer
}
func NewDistributedEnforcer(params ...interface{}) (*DistributedEnforcer, error) {
e := &DistributedEnforcer{}
var err error
e.SyncedEnforcer, err = NewSyncedEnforcer(params...)
if err != nil {
return nil, err
}
return e, nil
}
// SetDispatcher sets the current dispatcher.
func (d *DistributedEnforcer) SetDispatcher(dispatcher persist.Dispatcher) {
d.dispatcher = dispatcher
}
// AddPoliciesSelf provides a method for dispatcher to add authorization rules to the current policy.
// The function returns the rules affected and error.
func (d *DistributedEnforcer) AddPoliciesSelf(shouldPersist func() bool, sec string, ptype string, rules [][]string) (affected [][]string, err error) {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
var noExistsPolicy [][]string
for _, rule := range rules {
var hasPolicy bool
hasPolicy, err = d.model.HasPolicy(sec, ptype, rule)
if err != nil {
return nil, err
}
if !hasPolicy {
noExistsPolicy = append(noExistsPolicy, rule)
}
}
if err = d.adapter.(persist.BatchAdapter).AddPolicies(sec, ptype, noExistsPolicy); err != nil && err.Error() != notImplemented {
return nil, err
}
}
affected, err = d.model.AddPoliciesWithAffected(sec, ptype, rules)
if err != nil {
return affected, err
}
if sec == "g" {
err := d.BuildIncrementalRoleLinks(model.PolicyAdd, ptype, affected)
if err != nil {
return affected, err
}
}
return affected, nil
}
// RemovePoliciesSelf provides a method for dispatcher to remove a set of rules from current policy.
// The function returns the rules affected and error.
func (d *DistributedEnforcer) RemovePoliciesSelf(shouldPersist func() bool, sec string, ptype string, rules [][]string) (affected [][]string, err error) {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
if err = d.adapter.(persist.BatchAdapter).RemovePolicies(sec, ptype, rules); err != nil {
if err.Error() != notImplemented {
return nil, err
}
}
}
affected, err = d.model.RemovePoliciesWithAffected(sec, ptype, rules)
if err != nil {
return affected, err
}
if sec == "g" {
err = d.BuildIncrementalRoleLinks(model.PolicyRemove, ptype, affected)
if err != nil {
return affected, err
}
}
return affected, err
}
// RemoveFilteredPolicySelf provides a method for dispatcher to remove an authorization rule from the current policy, field filters can be specified.
// The function returns the rules affected and error.
func (d *DistributedEnforcer) RemoveFilteredPolicySelf(shouldPersist func() bool, sec string, ptype string, fieldIndex int, fieldValues ...string) (affected [][]string, err error) {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
if err = d.adapter.RemoveFilteredPolicy(sec, ptype, fieldIndex, fieldValues...); err != nil {
if err.Error() != notImplemented {
return nil, err
}
}
}
_, affected, err = d.model.RemoveFilteredPolicy(sec, ptype, fieldIndex, fieldValues...)
if err != nil {
return affected, err
}
if sec == "g" {
err := d.BuildIncrementalRoleLinks(model.PolicyRemove, ptype, affected)
if err != nil {
return affected, err
}
}
return affected, nil
}
// ClearPolicySelf provides a method for dispatcher to clear all rules from the current policy.
func (d *DistributedEnforcer) ClearPolicySelf(shouldPersist func() bool) error {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
err := d.adapter.SavePolicy(nil)
if err != nil {
return err
}
}
d.model.ClearPolicy()
return nil
}
// UpdatePolicySelf provides a method for dispatcher to update an authorization rule from the current policy.
func (d *DistributedEnforcer) UpdatePolicySelf(shouldPersist func() bool, sec string, ptype string, oldRule, newRule []string) (affected bool, err error) {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
err = d.adapter.(persist.UpdatableAdapter).UpdatePolicy(sec, ptype, oldRule, newRule)
if err != nil {
return false, err
}
}
ruleUpdated, err := d.model.UpdatePolicy(sec, ptype, oldRule, newRule)
if !ruleUpdated || err != nil {
return ruleUpdated, err
}
if sec == "g" {
err := d.BuildIncrementalRoleLinks(model.PolicyRemove, ptype, [][]string{oldRule}) // remove the old rule
if err != nil {
return ruleUpdated, err
}
err = d.BuildIncrementalRoleLinks(model.PolicyAdd, ptype, [][]string{newRule}) // add the new rule
if err != nil {
return ruleUpdated, err
}
}
return ruleUpdated, nil
}
// UpdatePoliciesSelf provides a method for dispatcher to update a set of authorization rules from the current policy.
func (d *DistributedEnforcer) UpdatePoliciesSelf(shouldPersist func() bool, sec string, ptype string, oldRules, newRules [][]string) (affected bool, err error) {
d.m.Lock()
defer d.m.Unlock()
if shouldPersist != nil && shouldPersist() {
err = d.adapter.(persist.UpdatableAdapter).UpdatePolicies(sec, ptype, oldRules, newRules)
if err != nil {
return false, err
}
}
ruleUpdated, err := d.model.UpdatePolicies(sec, ptype, oldRules, newRules)
if !ruleUpdated || err != nil {
return ruleUpdated, err
}
if sec == "g" {
err := d.BuildIncrementalRoleLinks(model.PolicyRemove, ptype, oldRules) // remove the old rule
if err != nil {
return ruleUpdated, err
}
err = d.BuildIncrementalRoleLinks(model.PolicyAdd, ptype, newRules) // add the new rule
if err != nil {
return ruleUpdated, err
}
}
return ruleUpdated, nil
}
// UpdateFilteredPoliciesSelf provides a method for dispatcher to update a set of authorization rules from the current policy.
func (d *DistributedEnforcer) UpdateFilteredPoliciesSelf(shouldPersist func() bool, sec string, ptype string, newRules [][]string, fieldIndex int, fieldValues ...string) (bool, error) {
d.m.Lock()
defer d.m.Unlock()
var (
oldRules [][]string
err error
)
if shouldPersist != nil && shouldPersist() {
oldRules, err = d.adapter.(persist.UpdatableAdapter).UpdateFilteredPolicies(sec, ptype, newRules, fieldIndex, fieldValues...)
if err != nil {
return false, err
}
}
ruleChanged, err := d.model.RemovePolicies(sec, ptype, oldRules)
if err != nil {
return ruleChanged, err
}
err = d.model.AddPolicies(sec, ptype, newRules)
if err != nil {
return ruleChanged, err
}
ruleChanged = ruleChanged && len(newRules) != 0
if !ruleChanged {
return ruleChanged, nil
}
if sec == "g" {
err := d.BuildIncrementalRoleLinks(model.PolicyRemove, ptype, oldRules) // remove the old rule
if err != nil {
return ruleChanged, err
}
err = d.BuildIncrementalRoleLinks(model.PolicyAdd, ptype, newRules) // add the new rule
if err != nil {
return ruleChanged, err
}
}
return true, nil
}
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