mirror of https://github.com/astaxie/beego.git
118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// Copyright 2017 The casbin Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations 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/model"
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"github.com/casbin/casbin/persist"
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"github.com/casbin/casbin/util"
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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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// 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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tmp.WriteString(ptype + ", ")
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tmp.WriteString(util.ArrayToString(rule))
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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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tmp.WriteString(ptype + ", ")
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tmp.WriteString(util.ArrayToString(rule))
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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 {
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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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handler(line, model)
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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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// error intentionally ignored
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w.WriteString(text)
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w.Flush()
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f.Close()
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return nil
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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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// 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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// 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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