diff --git a/idp/wechat.go b/idp/wechat.go
index 7bbbd18d..9fef2c27 100644
--- a/idp/wechat.go
+++ b/idp/wechat.go
@@ -198,12 +198,22 @@ func (idp *WeChatIdProvider) GetUserInfo(token *oauth2.Token) (*UserInfo, error)
 func GetWechatOfficialAccountAccessToken(clientId string, clientSecret string) (string, error) {
 	accessTokenUrl := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s", clientId, clientSecret)
 	request, err := http.NewRequest("GET", accessTokenUrl, nil)
+	if err != nil {
+		return "", err
+	}
+
 	client := new(http.Client)
 	resp, err := client.Do(request)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
 	respBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return "", err
 	}
+
 	var data struct {
 		ExpireIn    int    `json:"expires_in"`
 		AccessToken string `json:"access_token"`
@@ -212,20 +222,30 @@ func GetWechatOfficialAccountAccessToken(clientId string, clientSecret string) (
 	if err != nil {
 		return "", err
 	}
+
 	return data.AccessToken, nil
 }
 
 func GetWechatOfficialAccountQRCode(clientId string, clientSecret string) (string, error) {
 	accessToken, err := GetWechatOfficialAccountAccessToken(clientId, clientSecret)
 	client := new(http.Client)
-	params := "{\"action_name\": \"QR_LIMIT_STR_SCENE\", \"action_info\": {\"scene\": {\"scene_str\": \"test\"}}}"
+
+	weChatEndpoint := "https://api.weixin.qq.com/cgi-bin/qrcode/create"
+	qrCodeUrl := fmt.Sprintf("%s?access_token=%s", weChatEndpoint, accessToken)
+	params := `{"action_name": "QR_LIMIT_STR_SCENE", "action_info": {"scene": {"scene_str": "test"}}}`
+
 	bodyData := bytes.NewReader([]byte(params))
-	qrCodeUrl := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=%s", accessToken)
 	requeset, err := http.NewRequest("POST", qrCodeUrl, bodyData)
+	if err != nil {
+		return "", err
+	}
+
 	resp, err := client.Do(requeset)
 	if err != nil {
 		return "", err
 	}
+	defer resp.Body.Close()
+
 	respBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return "", err
diff --git a/object/adapter.go b/object/adapter.go
index 4a62ca6e..79cddc99 100644
--- a/object/adapter.go
+++ b/object/adapter.go
@@ -275,7 +275,7 @@ func GetSession(owner string, offset, limit int, field, value, sortField, sortOr
 		session = session.And("owner=?", owner)
 	}
 	if field != "" && value != "" {
-		if filterField(field) {
+		if util.FilterField(field) {
 			session = session.And(fmt.Sprintf("%s like ?", util.SnakeString(field)), fmt.Sprintf("%%%s%%", value))
 		}
 	}
@@ -303,7 +303,7 @@ func GetSessionForUser(owner string, offset, limit int, field, value, sortField,
 		}
 	}
 	if field != "" && value != "" {
-		if filterField(field) {
+		if util.FilterField(field) {
 			if offset != -1 {
 				field = fmt.Sprintf("a.%s", field)
 			}
diff --git a/object/check.go b/object/check.go
index 17341af5..12530394 100644
--- a/object/check.go
+++ b/object/check.go
@@ -16,7 +16,6 @@ package object
 
 import (
 	"fmt"
-	"regexp"
 	"strings"
 	"time"
 	"unicode"
@@ -28,21 +27,11 @@ import (
 	goldap "github.com/go-ldap/ldap/v3"
 )
 
-var (
-	reWhiteSpace     *regexp.Regexp
-	reFieldWhiteList *regexp.Regexp
-)
-
 const (
 	SigninWrongTimesLimit     = 5
 	LastSignWrongTimeDuration = time.Minute * 15
 )
 
-func init() {
-	reWhiteSpace, _ = regexp.Compile(`\s`)
-	reFieldWhiteList, _ = regexp.Compile(`^[A-Za-z0-9]+$`)
-}
-
 func CheckUserSignup(application *Application, organization *Organization, form *form.AuthForm, lang string) string {
 	if organization == nil {
 		return i18n.Translate(lang, "check:Organization does not exist")
@@ -58,7 +47,7 @@ func CheckUserSignup(application *Application, organization *Organization, form
 		if util.IsEmailValid(form.Username) {
 			return i18n.Translate(lang, "check:Username cannot be an email address")
 		}
-		if reWhiteSpace.MatchString(form.Username) {
+		if util.ReWhiteSpace.MatchString(form.Username) {
 			return i18n.Translate(lang, "check:Username cannot contain white spaces")
 		}
 
@@ -294,10 +283,6 @@ func CheckUserPassword(organization string, username string, password string, la
 	return user, ""
 }
 
-func filterField(field string) bool {
-	return reFieldWhiteList.MatchString(field)
-}
-
 func CheckUserPermission(requestUserId, userId string, strict bool, lang string) (bool, error) {
 	if requestUserId == "" {
 		return false, fmt.Errorf(i18n.Translate(lang, "general:Please login first"))
@@ -397,8 +382,8 @@ func CheckUsername(username string, lang string) string {
 	}
 
 	// https://stackoverflow.com/questions/58726546/github-username-convention-using-regex
-	re, _ := regexp.Compile("^[a-zA-Z0-9]+((?:-[a-zA-Z0-9]+)|(?:_[a-zA-Z0-9]+))*$")
-	if !re.MatchString(username) {
+
+	if !util.ReUserName.MatchString(username) {
 		return i18n.Translate(lang, "check:The username may only contain alphanumeric characters, underlines or hyphens, cannot have consecutive hyphens or underlines, and cannot begin or end with a hyphen or underline.")
 	}
 
diff --git a/util/validation.go b/util/validation.go
index e8675a87..ec48f951 100644
--- a/util/validation.go
+++ b/util/validation.go
@@ -22,10 +22,18 @@ import (
 	"github.com/nyaruka/phonenumbers"
 )
 
-var rePhone *regexp.Regexp
+var (
+	rePhone          *regexp.Regexp
+	ReWhiteSpace     *regexp.Regexp
+	ReFieldWhiteList *regexp.Regexp
+	ReUserName       *regexp.Regexp
+)
 
 func init() {
 	rePhone, _ = regexp.Compile(`(\d{3})\d*(\d{4})`)
+	ReWhiteSpace, _ = regexp.Compile(`\s`)
+	ReFieldWhiteList, _ = regexp.Compile(`^[A-Za-z0-9]+$`)
+	ReUserName, _ = regexp.Compile("^[a-zA-Z0-9]+((?:-[a-zA-Z0-9]+)|(?:_[a-zA-Z0-9]+))*$")
 }
 
 func IsEmailValid(email string) bool {
@@ -70,3 +78,7 @@ func GetCountryCode(prefix string, phone string) (string, error) {
 
 	return countryCode, nil
 }
+
+func FilterField(field string) bool {
+	return ReFieldWhiteList.MatchString(field)
+}