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casbin.go
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casbin.go
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package service
import (
"context"
"github.com/casbin/casbin/v2"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
"github.com/gogf/gf/v2/frame/g"
"github.com/tiger1103/gfast/v3/internal/app/common/dao"
"github.com/tiger1103/gfast/v3/internal/app/common/model/entity"
"sync"
)
type adapterCasbin struct {
Enforcer *casbin.SyncedEnforcer
EnforcerErr error
ctx context.Context
}
var (
once sync.Once
en *casbin.SyncedEnforcer
enErr error
)
// CasbinEnforcer 获取adapter单例对象
func CasbinEnforcer(ctx context.Context) (enforcer *casbin.SyncedEnforcer, err error) {
ac := newAdapter(ctx)
enforcer = ac.Enforcer
err = ac.EnforcerErr
return
}
// 初始化adapter操作
func newAdapter(ctx context.Context) (a *adapterCasbin) {
a = new(adapterCasbin)
a.ctx = ctx
once.Do(func() {
en, enErr = initPolicy(ctx, a)
})
if enErr == nil && en != nil {
en.SetAdapter(a)
}
a.Enforcer, a.EnforcerErr = en, enErr
return
}
func initPolicy(ctx context.Context, a *adapterCasbin) (e *casbin.SyncedEnforcer, err error) {
// Because the DB is empty at first,
// so we need to load the policy from the file adapter (.CSV) first.
e, err = casbin.NewSyncedEnforcer(g.Cfg().MustGet(ctx, "casbin.modelFile").String(), a)
return
}
// SavePolicy saves policy to database.
func (a *adapterCasbin) SavePolicy(model model.Model) (err error) {
err = a.dropTable()
if err != nil {
return
}
err = a.createTable()
if err != nil {
return
}
for ptype, ast := range model["p"] {
for _, rule := range ast.Policy {
line := savePolicyLine(ptype, rule)
_, err := dao.CasbinRule.Ctx(a.ctx).Data(line).Insert()
if err != nil {
return err
}
}
}
for ptype, ast := range model["g"] {
for _, rule := range ast.Policy {
line := savePolicyLine(ptype, rule)
_, err := dao.CasbinRule.Ctx(a.ctx).Data(line).Insert()
if err != nil {
return err
}
}
}
return
}
func (a *adapterCasbin) dropTable() (err error) {
return
}
func (a *adapterCasbin) createTable() (err error) {
return
}
// LoadPolicy loads policy from database.
func (a *adapterCasbin) LoadPolicy(model model.Model) error {
var lines []*entity.CasbinRule
if err := dao.CasbinRule.Ctx(a.ctx).Scan(&lines); err != nil {
return err
}
for _, line := range lines {
loadPolicyLine(line, model)
}
return nil
}
// AddPolicy adds a policy rule to the storage.
func (a *adapterCasbin) AddPolicy(sec string, ptype string, rule []string) error {
line := savePolicyLine(ptype, rule)
_, err := dao.CasbinRule.Ctx(a.ctx).Data(line).Insert()
return err
}
// RemovePolicy removes a policy rule from the storage.
func (a *adapterCasbin) RemovePolicy(sec string, ptype string, rule []string) error {
line := savePolicyLine(ptype, rule)
err := rawDelete(a, line)
return err
}
func (a *adapterCasbin) AddPolicies(sec string, ptype string, rules [][]string) error {
lines := make([]*entity.CasbinRule, len(rules))
for k, rule := range rules {
lines[k] = savePolicyLine(ptype, rule)
}
_, err := dao.CasbinRule.Ctx(a.ctx).Data(lines).Insert()
return err
}
// RemovePolicies removes policy rules from the storage.
// This is part of the Auto-Save feature.
func (a *adapterCasbin) RemovePolicies(sec string, ptype string, rules [][]string) error {
for _, rule := range rules {
err := a.RemovePolicy(sec, ptype, rule)
if err != nil {
return err
}
}
return nil
}
// RemoveFilteredPolicy removes policy rules that match the filter from the storage.
func (a *adapterCasbin) RemoveFilteredPolicy(sec string, ptype string,
fieldIndex int, fieldValues ...string) error {
line := &entity.CasbinRule{}
line.Ptype = ptype
if fieldIndex <= 0 && 0 < fieldIndex+len(fieldValues) {
line.V0 = fieldValues[0-fieldIndex]
}
if fieldIndex <= 1 && 1 < fieldIndex+len(fieldValues) {
line.V1 = fieldValues[1-fieldIndex]
}
if fieldIndex <= 2 && 2 < fieldIndex+len(fieldValues) {
line.V2 = fieldValues[2-fieldIndex]
}
if fieldIndex <= 3 && 3 < fieldIndex+len(fieldValues) {
line.V3 = fieldValues[3-fieldIndex]
}
if fieldIndex <= 4 && 4 < fieldIndex+len(fieldValues) {
line.V4 = fieldValues[4-fieldIndex]
}
if fieldIndex <= 5 && 5 < fieldIndex+len(fieldValues) {
line.V5 = fieldValues[5-fieldIndex]
}
err := rawDelete(a, line)
return err
}
func loadPolicyLine(line *entity.CasbinRule, model model.Model) {
lineText := line.Ptype
if line.V0 != "" {
lineText += ", " + line.V0
}
if line.V1 != "" {
lineText += ", " + line.V1
}
if line.V2 != "" {
lineText += ", " + line.V2
}
if line.V3 != "" {
lineText += ", " + line.V3
}
if line.V4 != "" {
lineText += ", " + line.V4
}
if line.V5 != "" {
lineText += ", " + line.V5
}
persist.LoadPolicyLine(lineText, model)
}
func savePolicyLine(ptype string, rule []string) *entity.CasbinRule {
line := &entity.CasbinRule{}
line.Ptype = ptype
if len(rule) > 0 {
line.V0 = rule[0]
}
if len(rule) > 1 {
line.V1 = rule[1]
}
if len(rule) > 2 {
line.V2 = rule[2]
}
if len(rule) > 3 {
line.V3 = rule[3]
}
if len(rule) > 4 {
line.V4 = rule[4]
}
if len(rule) > 5 {
line.V5 = rule[5]
}
return line
}
func rawDelete(a *adapterCasbin, line *entity.CasbinRule) error {
db := dao.CasbinRule.Ctx(a.ctx).Where("ptype = ?", line.Ptype)
if line.V0 != "" {
db = db.Where("v0 = ?", line.V0)
}
if line.V1 != "" {
db = db.Where("v1 = ?", line.V1)
}
if line.V2 != "" {
db = db.Where("v2 = ?", line.V2)
}
if line.V3 != "" {
db = db.Where("v3 = ?", line.V3)
}
if line.V4 != "" {
db = db.Where("v4 = ?", line.V4)
}
if line.V5 != "" {
db = db.Where("v5 = ?", line.V5)
}
_, err := db.Delete()
return err
}