Add v16.7.2

math/rand/rand.go

@@ -0,0 +1,43 @@
+package rand
+
+// https://www.calhoun.io/creating-random-strings-in-go/
+
+import (
+	"math/rand"
+	"time"
+)
+
+const (
+	CharsetLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	CharsetNumbers = "1234567890"
+	CharsetSymbols = "#@+*%&/<>[]()=?!$.,:;-_"
+
+	CharsetAll = CharsetLetters + CharsetNumbers + CharsetSymbols
+)
+
+var seededRand *rand.Rand = rand.New(rand.NewSource(time.Now().UnixNano()))
+
+func StringWithCharset(length int, charset string) string {
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = charset[seededRand.Intn(len(charset))]
+	}
+
+	return string(b)
+}
+
+func StringLetters(length int) string {
+	return StringWithCharset(length, CharsetLetters)
+}
+
+func StringNumbers(length int) string {
+	return StringWithCharset(length, CharsetNumbers)
+}
+
+func StringAlphanumeric(length int) string {
+	return StringWithCharset(length, CharsetLetters+CharsetNumbers)
+}
+
+func String(length int) string {
+	return StringWithCharset(length, CharsetAll)
+}