Imports github.com/golang/freetype rsc.io/qr rsc.io/qr/coding rsc.io/qr/gf256 rsc.io/swtch/qrweb/resize Standard library imports bytes crypto/md5 encoding/base64 encoding/json fmt html/template image image/color image/draw image/gif image/jpeg image/png io io/ioutil math/rand net/http net/url os sort strconv strings time