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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 fileadapter
import (
"bufio"
"bytes"
"errors"
"os"
"strings"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
"github.com/casbin/casbin/v2/util"
)
// Adapter is the file adapter for Casbin.
// It can load policy from file or save policy to file.
type Adapter struct {
filePath string
}
func (a *Adapter) UpdatePolicy(sec string, ptype string, oldRule, newRule []string) error {
return errors.New("not implemented")
}
func (a *Adapter) UpdatePolicies(sec string, ptype string, oldRules, newRules [][]string) error {
return errors.New("not implemented")
}
func (a *Adapter) UpdateFilteredPolicies(sec string, ptype string, newRules [][]string, fieldIndex int, fieldValues ...string) ([][]string, error) {
return nil, errors.New("not implemented")
}
// NewAdapter is the constructor for Adapter.
func NewAdapter(filePath string) *Adapter {
return &Adapter{filePath: filePath}
}
// LoadPolicy loads all policy rules from the storage.
func (a *Adapter) LoadPolicy(model model.Model) error {
if a.filePath == "" {
return errors.New("invalid file path, file path cannot be empty")
}
return a.loadPolicyFile(model, persist.LoadPolicyLine)
}
// SavePolicy saves all policy rules to the storage.
func (a *Adapter) SavePolicy(model model.Model) error {
if a.filePath == "" {
return errors.New("invalid file path, file path cannot be empty")
}
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")
}
}
return a.savePolicyFile(strings.TrimRight(tmp.String(), "\n"))
}
func (a *Adapter) loadPolicyFile(model model.Model, handler func(string, model.Model) error) error {
f, err := os.Open(a.filePath)
if err != nil {
return err
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
err = handler(line, model)
if err != nil {
return err
}
}
return scanner.Err()
}
func (a *Adapter) savePolicyFile(text string) error {
f, err := os.Create(a.filePath)
if err != nil {
return err
}
w := bufio.NewWriter(f)
_, err = w.WriteString(text)
if err != nil {
return err
}
err = w.Flush()
if err != nil {
return err
}
return f.Close()
}
// AddPolicy adds a policy rule to the storage.
func (a *Adapter) AddPolicy(sec string, ptype string, rule []string) error {
return errors.New("not implemented")
}
// AddPolicies adds policy rules to the storage.
func (a *Adapter) AddPolicies(sec string, ptype string, rules [][]string) error {
return errors.New("not implemented")
}
// RemovePolicy removes a policy rule from the storage.
func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error {
return errors.New("not implemented")
}
// RemovePolicies removes policy rules from the storage.
func (a *Adapter) RemovePolicies(sec string, ptype string, rules [][]string) error {
return errors.New("not implemented")
}
// RemoveFilteredPolicy removes policy rules that match the filter from the storage.
func (a *Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error {
return errors.New("not implemented")
}
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