Initial QSfera import

Server/vendor/github.com/gookit/goutil/strutil/random.go

@@ -0,0 +1,60 @@
+package strutil
+
+import (
+	"github.com/gookit/goutil/byteutil"
+	"github.com/gookit/goutil/x/encodes"
+)
+
+// some constant string chars
+const (
+	Numbers  = "0123456789"
+	HexChars = "0123456789abcdef" // base16
+
+	AlphaBet  = "abcdefghijklmnopqrstuvwxyz"
+	AlphaBet1 = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz"
+
+	// AlphaNum chars, can use for base36 encode
+	AlphaNum = "abcdefghijklmnopqrstuvwxyz0123456789"
+	// AlphaNum2 chars, can use for base62 encode
+	AlphaNum2 = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	AlphaNum3 = "0123456789AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz"
+)
+
+// RandomChars generate give length random chars at `a-z`
+func RandomChars(ln int) string {
+	return buildRandomString(AlphaBet, ln)
+}
+
+// RandomCharsV2 generate give length random chars in `0-9a-z`
+func RandomCharsV2(ln int) string {
+	return buildRandomString(AlphaNum, ln)
+}
+
+// RandomCharsV3 generate give length random chars in `0-9a-zA-Z`
+func RandomCharsV3(ln int) string {
+	return buildRandomString(AlphaNum2, ln)
+}
+
+// RandWithTpl generate random string with give template
+func RandWithTpl(n int, letters string) string {
+	if len(letters) == 0 {
+		letters = AlphaNum2
+	}
+	return buildRandomString(letters, n)
+}
+
+// RandomString generate.
+//
+// Example:
+//
+//	// this will give us a 44 byte, base64 encoded output
+//	token, err := RandomString(16) // eg: "I7S4yFZddRMxQoudLZZ-eg"
+func RandomString(length int) (string, error) {
+	b, err := RandomBytes(length)
+	return encodes.B64URL.EncodeToString(b), err
+}
+
+// RandomBytes generate
+func RandomBytes(length int) ([]byte, error) {
+	return byteutil.Random(length)
+}