158 lines
4.2 KiB
Go
158 lines
4.2 KiB
Go
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package fileadapter
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import (
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"bufio"
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"bytes"
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"errors"
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"os"
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"strings"
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"github.com/casbin/casbin/v3/model"
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"github.com/casbin/casbin/v3/persist"
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)
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// Adapter is the file adapter for Casbin.
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// It can load policy from file or save policy to file.
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type Adapter struct {
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filePath string
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}
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func (a *Adapter) UpdatePolicy(sec string, ptype string, oldRule, newRule []string) error {
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return errors.New("not implemented")
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}
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func (a *Adapter) UpdatePolicies(sec string, ptype string, oldRules, newRules [][]string) error {
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return errors.New("not implemented")
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}
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func (a *Adapter) UpdateFilteredPolicies(sec string, ptype string, newRules [][]string, fieldIndex int, fieldValues ...string) ([][]string, error) {
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return nil, errors.New("not implemented")
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}
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// NewAdapter is the constructor for Adapter.
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func NewAdapter(filePath string) *Adapter {
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return &Adapter{filePath: filePath}
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}
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// LoadPolicy loads all policy rules from the storage.
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func (a *Adapter) LoadPolicy(model model.Model) error {
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if a.filePath == "" {
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return errors.New("invalid file path, file path cannot be empty")
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}
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return a.loadPolicyFile(model, persist.LoadPolicyLine)
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}
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// SavePolicy saves all policy rules to the storage.
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func (a *Adapter) SavePolicy(model model.Model) error {
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if a.filePath == "" {
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return errors.New("invalid file path, file path cannot be empty")
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}
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var tmp bytes.Buffer
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for ptype, ast := range model["p"] {
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for _, rule := range ast.Policy {
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line, err := persist.PolicyLineToCsv(ptype, rule)
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if err != nil {
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return err
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}
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tmp.WriteString(line)
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tmp.WriteString("\n")
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}
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}
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for ptype, ast := range model["g"] {
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for _, rule := range ast.Policy {
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line, err := persist.PolicyLineToCsv(ptype, rule)
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if err != nil {
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return err
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}
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tmp.WriteString(line)
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tmp.WriteString("\n")
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}
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}
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return a.savePolicyFile(strings.TrimRight(tmp.String(), "\n"))
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}
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func (a *Adapter) loadPolicyFile(model model.Model, handler func(string, model.Model) error) error {
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f, err := os.Open(a.filePath)
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if err != nil {
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return err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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err = handler(line, model)
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if err != nil {
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return err
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}
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}
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return scanner.Err()
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}
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func (a *Adapter) savePolicyFile(text string) error {
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f, err := os.Create(a.filePath)
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if err != nil {
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return err
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}
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w := bufio.NewWriter(f)
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_, err = w.WriteString(text)
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if err != nil {
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return err
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}
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err = w.Flush()
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if err != nil {
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return err
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}
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return f.Close()
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}
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// AddPolicy adds a policy rule to the storage.
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func (a *Adapter) AddPolicy(sec string, ptype string, rule []string) error {
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return errors.New("not implemented")
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}
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// AddPolicies adds policy rules to the storage.
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func (a *Adapter) AddPolicies(sec string, ptype string, rules [][]string) error {
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return errors.New("not implemented")
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}
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// RemovePolicy removes a policy rule from the storage.
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func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error {
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return errors.New("not implemented")
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}
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// RemovePolicies removes policy rules from the storage.
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func (a *Adapter) RemovePolicies(sec string, ptype string, rules [][]string) error {
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return errors.New("not implemented")
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}
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// RemoveFilteredPolicy removes policy rules that match the filter from the storage.
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func (a *Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error {
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return errors.New("not implemented")
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}
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