refactor: simplify login captcha validation flow for cleaner code

server/api/v1/system/sys_user.go

@@ -47,8 +47,13 @@ func (b *BaseApi) Login(c *gin.Context) {
 	}
 
 	var oc bool = openCaptcha == 0 || openCaptcha < interfaceToInt(v)
+	if oc && !store.Verify(l.CaptchaId, l.Captcha, true) {
+		// 验证码次数+1
+		global.BlackCache.Increment(key, 1)
+		response.FailWithMessage("验证码错误", c)
+		return
+	}
 
-	if !oc || store.Verify(l.CaptchaId, l.Captcha, true) {
 	u := &system.SysUser{Username: l.Username, Password: l.Password}
 	user, err := userService.Login(u)
 	if err != nil {
@@ -66,11 +71,6 @@ func (b *BaseApi) Login(c *gin.Context) {
 		return
 	}
 	b.TokenNext(c, *user)
-		return
-	}
-	// 验证码次数+1
-	global.BlackCache.Increment(key, 1)
-	response.FailWithMessage("验证码错误", c)
 }
 
 // TokenNext 登录以后签发jwt