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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"
"errors"
"os"
"strings"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
)
// FilteredAdapter is the filtered file adapter for Casbin. It can load policy
// from file or save policy to file and supports loading of filtered policies.
type FilteredAdapter struct {
*Adapter
filtered bool
}
// Filter defines the filtering rules for a FilteredAdapter's policy. Empty values
// are ignored, but all others must match the filter.
type Filter struct {
P []string
G []string
G1 []string
G2 []string
G3 []string
G4 []string
G5 []string
}
// NewFilteredAdapter is the constructor for FilteredAdapter.
func NewFilteredAdapter(filePath string) *FilteredAdapter {
a := FilteredAdapter{}
a.filtered = true
a.Adapter = NewAdapter(filePath)
return &a
}
// LoadPolicy loads all policy rules from the storage.
func (a *FilteredAdapter) LoadPolicy(model model.Model) error {
a.filtered = false
return a.Adapter.LoadPolicy(model)
}
// LoadFilteredPolicy loads only policy rules that match the filter.
func (a *FilteredAdapter) LoadFilteredPolicy(model model.Model, filter interface{}) error {
if filter == nil {
return a.LoadPolicy(model)
}
if a.filePath == "" {
return errors.New("invalid file path, file path cannot be empty")
}
filterValue, ok := filter.(*Filter)
if !ok {
return errors.New("invalid filter type")
}
err := a.loadFilteredPolicyFile(model, filterValue, persist.LoadPolicyLine)
if err == nil {
a.filtered = true
}
return err
}
func (a *FilteredAdapter) loadFilteredPolicyFile(model model.Model, filter *Filter, 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())
if filterLine(line, filter) {
continue
}
err = handler(line, model)
if err != nil {
return err
}
}
return scanner.Err()
}
// IsFiltered returns true if the loaded policy has been filtered.
func (a *FilteredAdapter) IsFiltered() bool {
return a.filtered
}
// SavePolicy saves all policy rules to the storage.
func (a *FilteredAdapter) SavePolicy(model model.Model) error {
if a.filtered {
return errors.New("cannot save a filtered policy")
}
return a.Adapter.SavePolicy(model)
}
func filterLine(line string, filter *Filter) bool {
if filter == nil {
return false
}
p := strings.Split(line, ",")
if len(p) == 0 {
return true
}
var filterSlice []string
switch strings.TrimSpace(p[0]) {
case "p":
filterSlice = filter.P
case "g":
filterSlice = filter.G
case "g1":
filterSlice = filter.G1
case "g2":
filterSlice = filter.G2
case "g3":
filterSlice = filter.G3
case "g4":
filterSlice = filter.G4
case "g5":
filterSlice = filter.G5
}
return filterWords(p, filterSlice)
}
func filterWords(line []string, filter []string) bool {
if len(line) < len(filter)+1 {
return true
}
var skipLine bool
for i, v := range filter {
if len(v) > 0 && strings.TrimSpace(v) != strings.TrimSpace(line[i+1]) {
skipLine = true
break
}
}
return skipLine
}
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