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handler.go
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handler.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* 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 encryption
import (
"fmt"
"strings"
"sync"
"github.com/joy999/nacos-sdk-go/common/logger"
)
var (
initDefaultHandlerOnce = &sync.Once{}
defaultHandler *DefaultHandler
)
type HandlerParam struct {
DataId string `json:"dataId"` //required
Content string `json:"content"` //required
EncryptedDataKey string `json:"encryptedDataKey"`
PlainDataKey string `json:"plainDataKey"`
KeyId string `json:"keyId"`
}
type Plugin interface {
Encrypt(*HandlerParam) error
Decrypt(*HandlerParam) error
AlgorithmName() string
GenerateSecretKey(*HandlerParam) (string, error)
EncryptSecretKey(*HandlerParam) (string, error)
DecryptSecretKey(*HandlerParam) (string, error)
}
type Handler interface {
EncryptionHandler(*HandlerParam) error
DecryptionHandler(*HandlerParam) error
RegisterPlugin(Plugin) error
}
func GetDefaultHandler() Handler {
if defaultHandler == nil {
initDefaultHandler()
}
return defaultHandler
}
func initDefaultHandler() {
initDefaultHandlerOnce.Do(func() {
defaultHandler = &DefaultHandler{
encryptionPlugins: make(map[string]Plugin, 2),
}
logger.Info("successfully create encryption defaultHandler")
})
}
type DefaultHandler struct {
encryptionPlugins map[string]Plugin
}
func (d *DefaultHandler) EncryptionHandler(param *HandlerParam) error {
if err := d.encryptionParamCheck(*param); err != nil {
if err == DataIdParamCheckError || err == ContentParamCheckError {
return nil
}
return err
}
plugin, err := d.getPluginByDataIdPrefix(param.DataId)
if err != nil {
return err
}
plainSecretKey, err := plugin.GenerateSecretKey(param)
if err != nil {
return err
}
param.PlainDataKey = plainSecretKey
return plugin.Encrypt(param)
}
func (d *DefaultHandler) DecryptionHandler(param *HandlerParam) error {
if err := d.decryptionParamCheck(*param); err != nil {
if err == DataIdParamCheckError || err == ContentParamCheckError {
return nil
}
return err
}
plugin, err := d.getPluginByDataIdPrefix(param.DataId)
if err != nil {
return err
}
plainSecretkey, err := plugin.DecryptSecretKey(param)
if err != nil {
return err
}
param.PlainDataKey = plainSecretkey
return plugin.Decrypt(param)
}
func (d *DefaultHandler) getPluginByDataIdPrefix(dataId string) (Plugin, error) {
var (
matchedCount int
matchedPlugin Plugin
)
for k, v := range d.encryptionPlugins {
if strings.Contains(dataId, k) {
if len(k) > matchedCount {
matchedCount = len(k)
matchedPlugin = v
}
}
}
if matchedPlugin == nil {
return matchedPlugin, PluginNotFoundError
}
return matchedPlugin, nil
}
func (d *DefaultHandler) RegisterPlugin(plugin Plugin) error {
if _, v := d.encryptionPlugins[plugin.AlgorithmName()]; v {
logger.Warnf("encryption algorithm [%s] has already registered to defaultHandler, will be update", plugin.AlgorithmName())
} else {
logger.Infof("register encryption algorithm [%s] to defaultHandler", plugin.AlgorithmName())
}
d.encryptionPlugins[plugin.AlgorithmName()] = plugin
return nil
}
func (d *DefaultHandler) encryptionParamCheck(param HandlerParam) error {
if err := d.dataIdParamCheck(param.DataId); err != nil {
return DataIdParamCheckError
}
if err := d.contentParamCheck(param.Content); err != nil {
return ContentParamCheckError
}
return nil
}
func (d *DefaultHandler) decryptionParamCheck(param HandlerParam) error {
if err := d.dataIdParamCheck(param.DataId); err != nil {
return DataIdParamCheckError
}
if err := d.contentParamCheck(param.Content); err != nil {
return ContentParamCheckError
}
return nil
}
func (d *DefaultHandler) dataIdParamCheck(dataId string) error {
if !strings.Contains(dataId, CipherPrefix) {
return fmt.Errorf("dataId prefix should start with: %s", CipherPrefix)
}
return nil
}
func (d *DefaultHandler) contentParamCheck(content string) error {
if len(content) == 0 {
return fmt.Errorf("content need to encrypt is nil")
}
return nil
}