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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 persist
import (
"encoding/csv"
"strings"
"github.com/casbin/casbin/v2/model"
)
// LoadPolicyLine loads a text line as a policy rule to model.
func LoadPolicyLine(line string, m model.Model) error {
if line == "" || strings.HasPrefix(line, "#") {
return nil
}
r := csv.NewReader(strings.NewReader(line))
r.Comma = ','
r.Comment = '#'
r.TrimLeadingSpace = true
tokens, err := r.Read()
if err != nil {
return err
}
return LoadPolicyArray(tokens, m)
}
// LoadPolicyArray loads a policy rule to model.
func LoadPolicyArray(rule []string, m model.Model) error {
key := rule[0]
sec := key[:1]
ok, err := m.HasPolicyEx(sec, key, rule[1:])
if err != nil {
return err
}
if ok {
return nil // skip duplicated policy
}
err = m.AddPolicy(sec, key, rule[1:])
if err != nil {
return err
}
return nil
}
// Adapter is the interface for Casbin adapters.
type Adapter interface {
// LoadPolicy loads all policy rules from the storage.
LoadPolicy(model model.Model) error
// SavePolicy saves all policy rules to the storage.
SavePolicy(model model.Model) error
// AddPolicy adds a policy rule to the storage.
// This is part of the Auto-Save feature.
AddPolicy(sec string, ptype string, rule []string) error
// RemovePolicy removes a policy rule from the storage.
// This is part of the Auto-Save feature.
RemovePolicy(sec string, ptype string, rule []string) error
// RemoveFilteredPolicy removes policy rules that match the filter from the storage.
// This is part of the Auto-Save feature.
RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error
}
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