✨ Add Random Generator

gen_rand.go

@@ -0,0 +1,60 @@
+package nomino
+
+import (
+	"crypto/rand"
+	"strings"
+
+	"github.com/deatil/go-encoding/base62"
+	"github.com/google/uuid"
+)
+
+func uuidGen(*Config) (string, error) {
+	u, err := uuid.NewRandom()
+	if err != nil {
+		return "", err
+	}
+	return u.String(), nil
+}
+
+// UUID generates a UUIDv4.
+func UUID() Generator {
+	return uuidGen
+}
+
+type randConf struct {
+	length int
+}
+
+// RandomOption is an option for the Random Generator
+type RandomOption func(*randConf)
+
+// RandomLength controls the length of the string generated by Random
+func RandomLength(length int) RandomOption {
+	return func(c *randConf) {
+		c.length = length
+	}
+}
+
+func getRandomBytes(l int) []byte {
+	key := make([]byte, l)
+	rand.Read(key)
+	e := base62.StdEncoding.Encode(key)
+	return e[:l]
+}
+
+// Random generates a random string containing the characters [A-Za-z0-9].
+// By default, it will be eight characters long.
+func Random(opts ...RandomOption) Generator {
+	c := randConf{8}
+	for _, opt := range opts {
+		opt(&c)
+	}
+	return func(*Config) (string, error) {
+		var buff strings.Builder
+		buff.Grow(c.length)
+		for buff.Len() < c.length {
+			buff.Write(getRandomBytes(c.length - buff.Len()))
+		}
+		return buff.String(), nil
+	}
+}