Imports github.com/gorilla/websocket github.com/skip2/go-qrcode gorm.io/driver/mysql gorm.io/driver/sqlite gorm.io/gorm gorm.io/gorm/schema Standard library imports bytes crypto/md5 crypto/rand embed encoding/base64 encoding/hex encoding/json errors fmt io io/fs io/ioutil log math/big net net/http net/url os regexp strconv strings sync time