Imports github.com/boombuler/barcode github.com/boombuler/barcode/qr github.com/tealeg/xlsx github.com/tuotoo/qrcode Standard library imports bytes crypto/aes crypto/cipher crypto/des crypto/hmac crypto/md5 crypto/sha1 crypto/tls encoding/base32 encoding/base64 encoding/binary encoding/hex encoding/json errors fmt image image/png io io/ioutil log math/rand net net/http net/url os path/filepath reflect sort strconv strings time