/
etcdadapter.go
106 lines (91 loc) · 2.79 KB
/
etcdadapter.go
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/*
* Copyright (C) 2018 Red Hat, Inc.
*
* 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 ofthe 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 specificlanguage governing permissions and
* limitations under the License.
*
*/
package rbac
import (
"bufio"
"bytes"
"context"
"errors"
"io"
"strings"
"github.com/casbin/casbin/model"
"github.com/casbin/casbin/persist"
"github.com/casbin/casbin/util"
etcd "go.etcd.io/etcd/client/v2"
)
const etcdPolicyKey = "/casbinPolicy"
// EtcdAdapter represents the etcd adapter for policy persistence, can load policy
// from etcd or save policy to etcd.
type EtcdAdapter struct {
kapi etcd.KeysAPI
}
// NewEtcdAdapter is the constructor for EtcdAdapter.
func NewEtcdAdapter(kapi etcd.KeysAPI) (*EtcdAdapter, error) {
return &EtcdAdapter{kapi: kapi}, nil
}
// LoadPolicy loads policy from etcd.
func (a *EtcdAdapter) LoadPolicy(model model.Model) error {
resp, err := a.kapi.Get(context.Background(), etcdPolicyKey, nil)
if err != nil {
return err
}
buf := bufio.NewReader(bytes.NewReader([]byte(resp.Node.Value)))
for {
line, err := buf.ReadString('\n')
line = strings.TrimSpace(line)
persist.LoadPolicyLine(line, model)
if err != nil {
if err == io.EOF {
return nil
}
return err
}
}
}
// SavePolicy saves policy to etcd.
func (a *EtcdAdapter) SavePolicy(model model.Model) error {
var tmp bytes.Buffer
for ptype, ast := range model["p"] {
for _, rule := range ast.Policy {
tmp.WriteString(ptype + ", ")
tmp.WriteString(util.ArrayToString(rule))
tmp.WriteString("\n")
}
}
for ptype, ast := range model["g"] {
for _, rule := range ast.Policy {
tmp.WriteString(ptype + ", ")
tmp.WriteString(util.ArrayToString(rule))
tmp.WriteString("\n")
}
}
s := strings.TrimRight(tmp.String(), "\n")
_, err := a.kapi.Set(context.Background(), etcdPolicyKey, s, nil)
return err
}
// AddPolicy adds a policy rule to the storage.
func (a *EtcdAdapter) AddPolicy(sec string, ptype string, rule []string) error {
return errors.New("not implemented")
}
// RemovePolicy removes a policy rule from the storage.
func (a *EtcdAdapter) RemovePolicy(sec string, ptype string, rule []string) error {
return errors.New("not implemented")
}
// RemoveFilteredPolicy removes policy rules that match the filter from the storage.
func (a *EtcdAdapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error {
return errors.New("not implemented")
}