Imports firebase.google.com/go firebase.google.com/go/messaging github.com/golang-jwt/jwt/v4 github.com/gorilla/mux github.com/joho/godotenv github.com/rs/cors golang.org/x/crypto/bcrypt google.golang.org/api/option gorm.io/driver/mysql gorm.io/gorm Standard library imports context encoding/json fmt log math/rand net/http os strings sync time