Imports gorm.io/gorm github.com/disintegration/imaging github.com/gorilla/mux gorm.io/driver/sqlite github.com/boombuler/barcode github.com/boombuler/barcode/ean github.com/llgcode/draw2d github.com/llgcode/draw2d/draw2dimg Standard library imports bytes encoding/base64 encoding/json fmt image image/color image/draw image/jpeg io/ioutil log math/rand net/http strconv time