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adapter.go
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adapter.go
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// Copyright 2020 by Blank-Xu. 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 sqladapter
import (
"context"
"database/sql"
"errors"
"strings"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
)
var (
_ persist.Adapter = new(Adapter)
_ persist.FilteredAdapter = new(Adapter)
_ persist.BatchAdapter = new(Adapter)
_ persist.UpdatableAdapter = new(Adapter)
)
// NewAdapter the constructor for Adapter.
// db should connected to database and controlled by user.
// If tableName == "", the Adapter will automatically create a table named "casbin_rule".
func NewAdapter(db *sql.DB, driverName, tableName string) (*Adapter, error) {
return NewAdapterWithContext(context.Background(), db, driverName, tableName)
}
// NewAdapterWithContext the constructor for Adapter.
// db should connected to database and controlled by user.
// If tableName == "", the Adapter will automatically create a table named "casbin_rule".
func NewAdapterWithContext(ctx context.Context, db *sql.DB, driverName, tableName string) (*Adapter, error) {
if ctx == nil {
return nil, errors.New("ctx is nil")
}
if db == nil {
return nil, errors.New("db is nil")
}
// check db connection
err := db.PingContext(ctx)
if err != nil {
return nil, err
}
if tableName == "" {
tableName = defaultTableName
}
d, err := getDao(db, driverName, tableName)
if err != nil {
return nil, err
}
if !d.IsTableExist(ctx) {
if err = d.CreateTable(ctx); err != nil {
return nil, err
}
}
adapter := Adapter{ctx: ctx, dao: d}
return &adapter, nil
}
// Adapter defines the database adapter for Casbin.
// It can load policy lines from connected database or save policy lines.
type Adapter struct {
dao dao
// Could not be removed until Casbin adapter interface support context as the first parameter.
ctx context.Context
filtered interface{}
}
// loadPolicyLine load a policy line to model.
func (Adapter) loadPolicyLine(line rule, model model.Model) error {
// return persist.LoadPolicyLine(strings.Join(line.Data(), ","), model)
return persist.LoadPolicyArray(line.Data(), model)
}
// genArgs generate args from ptype and rule.
func (Adapter) genArgs(ptype string, rule []string) []interface{} {
args := make([]interface{}, maxParameterCount)
args[0] = ptype
for idx := range rule {
args[idx+1] = strings.TrimSpace(rule[idx])
}
for idx := len(rule) + 1; idx < maxParameterCount; idx++ {
args[idx] = ""
}
return args
}
// LoadPolicy load all policy rules from the storage.
func (adapter *Adapter) LoadPolicy(model model.Model) error {
lines, err := adapter.dao.SelectAll(adapter.ctx)
if err != nil {
return err
}
adapter.filtered = nil
for _, line := range lines {
if err = adapter.loadPolicyLine(line, model); err != nil {
return err
}
}
return nil
}
// SavePolicy save policy rules to the storage.
func (adapter Adapter) SavePolicy(model model.Model) error {
if adapter.filtered != nil {
return errors.New("could not save filtered policies")
}
args := make([][]interface{}, 0, 128)
for ptype, ast := range model["p"] {
for _, rule := range ast.Policy {
arg := adapter.genArgs(ptype, rule)
args = append(args, arg)
}
}
for ptype, ast := range model["g"] {
for _, rule := range ast.Policy {
arg := adapter.genArgs(ptype, rule)
args = append(args, arg)
}
}
return adapter.dao.DeleteAllAndInsertRows(adapter.ctx, args)
}
// AddPolicy add one policy rule to the storage.
func (adapter Adapter) AddPolicy(sec string, ptype string, rule []string) error {
args := adapter.genArgs(ptype, rule)
return adapter.dao.InsertRow(adapter.ctx, args...)
}
// AddPolicies add multiple policy rules to the storage.
func (adapter Adapter) AddPolicies(sec string, ptype string, rules [][]string) error {
args := make([][]interface{}, 0, len(rules))
for _, rule := range rules {
arg := adapter.genArgs(ptype, rule)
args = append(args, arg)
}
return adapter.dao.InsertRows(adapter.ctx, args)
}
// RemovePolicy remove policy rules from the storage.
func (adapter Adapter) RemovePolicy(sec, ptype string, rule []string) error {
return adapter.dao.DeleteByArgs(adapter.ctx, ptype, rule)
}
// RemoveFilteredPolicy remove policy rules that match the filter from the storage.
func (adapter Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error {
whereCondition, whereArgs := adapter.dao.GenFilteredCondition(ptype, fieldIndex, fieldValues...)
return adapter.dao.DeleteByCondition(adapter.ctx, whereCondition, whereArgs...)
}
func (adapter Adapter) RemovePolicies(sec string, ptype string, rules [][]string) (err error) {
args := make([][]interface{}, len(rules))
for idx, rule := range rules {
arg := adapter.genArgs(ptype, rule)
args[idx] = arg
}
return adapter.dao.DeleteRows(adapter.ctx, args)
}
// LoadFilteredPolicy load policy rules that match the Filter.
// filterPtr must be a pointer.
func (adapter *Adapter) LoadFilteredPolicy(model model.Model, filterPtr interface{}) error {
if filterPtr == nil {
return adapter.LoadPolicy(model)
}
filter, ok := filterPtr.(*Filter)
if !ok {
return errors.New("invalid filter type")
}
lines, err := adapter.dao.SelectByFilter(adapter.ctx, filter.genData())
if err != nil {
return err
}
for _, line := range lines {
if err = adapter.loadPolicyLine(line, model); err != nil {
return err
}
}
adapter.filtered = struct{}{}
return nil
}
// IsFiltered returns true if the loaded policy rules has been filtered.
func (adapter Adapter) IsFiltered() bool {
return adapter.filtered != nil
}
// UpdatePolicy update a policy rule from storage.
// This is part of the Auto-Save feature.
func (adapter Adapter) UpdatePolicy(sec, ptype string, oldRule, newPolicy []string) error {
oldArgs := adapter.genArgs(ptype, oldRule)
newArgs := adapter.genArgs(ptype, newPolicy)
return adapter.dao.UpdateRow(adapter.ctx, append(newArgs, oldArgs...)...)
}
// UpdatePolicies updates policy rules to storage.
func (adapter Adapter) UpdatePolicies(sec, ptype string, oldRules, newRules [][]string) (err error) {
if len(oldRules) != len(newRules) {
return errors.New("old rules size not equal to new rules size")
}
args := make([][]interface{}, 0, len(oldRules)+len(newRules))
for idx := range oldRules {
oldArgs := adapter.genArgs(ptype, oldRules[idx])
newArgs := adapter.genArgs(ptype, newRules[idx])
args = append(args, append(newArgs, oldArgs...))
}
return adapter.dao.UpdateRows(adapter.ctx, args)
}
// UpdateFilteredPolicies deletes old rules and adds new rules.
func (adapter Adapter) UpdateFilteredPolicies(sec, ptype string, newPolicies [][]string, fieldIndex int, fieldValues ...string) (oldPolicies [][]string, err error) {
whereCondition, whereArgs := adapter.dao.GenFilteredCondition(ptype, fieldIndex, fieldValues...)
var oldRules []rule
oldRules, err = adapter.dao.SelectByCondition(adapter.ctx, whereCondition, whereArgs...)
if err != nil {
return
}
args := make([][]interface{}, 0, len(newPolicies))
for _, policy := range newPolicies {
arg := adapter.genArgs(ptype, policy)
args = append(args, arg)
}
if err = adapter.dao.UpdateFilteredRows(adapter.ctx, whereCondition, whereArgs, args); err != nil {
return
}
oldPolicies = make([][]string, 0, len(oldRules))
for _, rule := range oldRules {
oldPolicies = append(oldPolicies, rule.Data())
}
return
}