Initial import.

links/alphabet.go

@@ -0,0 +1,30 @@
+package links
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+const codeLength = 5
+
+var (
+	alphabet       = "ABCDEFGHJKMNPQRSTUVWXYZ23456789"
+	alphabetLength = big.NewInt(int64(len(alphabet)))
+)
+
+func randInt() int {
+	p, err := rand.Int(rand.Reader, alphabetLength)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	return int(p.Int64())
+}
+
+func GenCode() string {
+	var code []byte
+	for i := 0; i < codeLength; i++ {
+		code = append(code, alphabet[randInt()])
+	}
+	return string(code)
+}