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wechat.go
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wechat.go
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package wechat
import (
"context"
"crypto/aes"
"crypto/cipher"
"crypto/sha1"
"encoding/base64"
"fmt"
"github.com/treeyh/soc-go-common/core/config"
"github.com/treeyh/soc-go-common/core/errors"
"github.com/treeyh/soc-go-common/core/logger"
"github.com/treeyh/soc-go-common/core/utils/copyer"
"github.com/treeyh/soc-go-common/core/utils/json"
"sort"
"strings"
"sync"
)
const weChatPreUrl = "https://api.weixin.qq.com"
var (
wechatProxys = make(map[string]*WechatProxy)
_defaultConfigName = "default"
poolMutex sync.Mutex
log = logger.Logger()
)
type WechatProxy struct {
wechatConfig *config.WeChatConfig
}
func (wcp *WechatProxy) GetPreUrl() string {
if wcp.wechatConfig.Host != "" {
return wcp.wechatConfig.Host
}
return weChatPreUrl
}
// InitWeChatConfig 初始化微信配置
func InitWeChatConfig(weChatConfigs map[string]config.WeChatConfig) {
poolMutex.Lock()
defer poolMutex.Unlock()
wechatProxys1 := make(map[string]*WechatProxy)
for k, v := range weChatConfigs {
vv := &config.WeChatConfig{}
err := copyer.Copy(context.Background(), v, vv)
if err != nil {
panic(fmt.Sprintf("init wechat config fail. %+v", err))
}
wechatProxys1[k] = &WechatProxy{wechatConfig: vv}
}
wechatProxys = wechatProxys1
}
// GetProxy get default redis oper proxy
func GetProxy() *WechatProxy {
return GetProxyByName(_defaultConfigName)
}
// GetProxyByName get redis oper proxy
func GetProxyByName(name string) *WechatProxy {
if v, ok := wechatProxys[name]; ok {
return v
}
return nil
}
// DecryptEncryptedData Weixin APP's AES Data
// If isJSON is true, Decrypt return JSON type.
// If isJSON is false, Decrypt return map type.
func (wcp *WechatProxy) DecryptEncryptedData(ctx context.Context, sessionKey string, encryptedData string, iv string, isJSON bool) (interface{}, errors.AppError) {
if len(sessionKey) != 24 {
return nil, errors.NewAppError(errors.WechatOperationError, "sessionKey length is error")
}
aesCipherText, err := base64.StdEncoding.DecodeString(encryptedData)
if err != nil {
log.Error("encryptedData decode base64 error :"+encryptedData+" error:"+err.Error(), logger.GetTraceField(ctx))
return nil, errors.NewAppErrorByExistError(errors.WechatOperationError, err, "decode base64 error")
}
aesKey, err := base64.StdEncoding.DecodeString(sessionKey)
if err != nil {
log.Error("sessionKey decode base64 error :"+sessionKey+" error:"+err.Error(), logger.GetTraceField(ctx))
return nil, errors.NewAppErrorByExistError(errors.WechatOperationError, err, "decode base64 error")
}
if len(iv) != 24 {
log.Error("iv length is error :"+iv, logger.GetTraceField(ctx))
return nil, errors.NewAppError(errors.WechatOperationError, "iv length is error")
}
aesIV, err := base64.StdEncoding.DecodeString(iv)
if err != nil {
log.Error("iv decode base64 error :"+iv+" error:"+err.Error(), logger.GetTraceField(ctx))
return nil, errors.NewAppErrorByExistError(errors.WechatOperationError, err, "decode base64 error")
}
//aesPlantText := make([]byte, len(aesCipherText))
dataBytes, err1 := AesDecrypt(ctx, aesCipherText, aesKey, aesIV)
if err1 != nil {
return nil, err1
}
jsonStr := string(dataBytes)
log.InfoCtx(ctx, jsonStr)
jsonStr = jsonStr[:strings.LastIndex(jsonStr, "}")+1]
var decrypted map[string]interface{}
//err = json.Unmarshal(dataBytes, &decrypted)
err = json.FromJson(jsonStr, &decrypted)
if err != nil {
log.Error("format json error:"+jsonStr+" error:"+err.Error(), logger.GetTraceField(ctx))
return nil, errors.NewAppErrorByExistError(errors.WechatOperationError, err, "format json error")
}
if decrypted["watermark"].(map[string]interface{})["appid"] != wcp.wechatConfig.AppId {
log.Error("appID is not match:", logger.GetTraceField(ctx))
return nil, errors.NewAppError(errors.WechatOperationError, "appID is not match")
}
if isJSON == true {
return strings.TrimSpace(jsonStr), nil
}
return decrypted, nil
}
// AuthVerify 验证签名
func (wcp *WechatProxy) AuthVerify(signature, timestamp, nonce, echostr string) (string, bool) {
// 将参数排序和拼接
str := sort.StringSlice{wcp.wechatConfig.Token, timestamp, nonce}
sort.Sort(str)
sortStr := ""
for _, v := range str {
sortStr += v
}
// 进行 sha1 加密
sh := sha1.New()
sh.Write([]byte(sortStr))
encryptStr := fmt.Sprintf("%x", sh.Sum(nil))
// 将本地计算的签名和微信传递过来的签名进行对比
if encryptStr == signature {
return echostr, true
}
return "Invalid Signature.", false
}
// PKCS7UnPadding return unpadding []Byte plantText
func PKCS7UnPadding(plantText []byte) []byte {
length := len(plantText)
if length > 0 {
unPadding := int(plantText[length-1])
return plantText[:(length - unPadding)]
}
return plantText
}
// CheckErrCodeSucceed 检查接口返回是否成功
func CheckErrCodeSucceed(httpStatus int, errCode int64) bool {
return httpStatus == 200 && errCode == 0
}
func AesDecrypt(ctx context.Context, crypted, key, iv []byte) ([]byte, errors.AppError) {
block, err := aes.NewCipher(key)
if err != nil {
log.ErrorCtx(ctx, "aesKey aes error:"+err.Error())
return nil, errors.NewAppErrorByExistError(errors.WechatOperationError, err, "aes error")
}
//blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, iv)
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
//获取的数据尾端有'/x0e'占位符,去除它
//for i, ch := range origData {
// if ch == '\x0e' || ch == '\x0f' || ch == '\x06' {
// origData[i] = ' '
// }
//}
return origData, nil
}