From 0591eed275fd24e5c1b959e1a182bea6f6275c34 Mon Sep 17 00:00:00 2001
From: Bryan McNulty <bryanmcnulty@protonmail.com>
Date: Wed, 26 Feb 2025 19:42:55 -0600
Subject: Initial commit +scmrexec

---
 internal/util/util.go | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 internal/util/util.go

(limited to 'internal')

diff --git a/internal/util/util.go b/internal/util/util.go
new file mode 100644
index 0000000..252815e
--- /dev/null
+++ b/internal/util/util.go
@@ -0,0 +1,35 @@
+package util
+
+import (
+	"math/rand" // not crypto secure
+	"regexp"
+)
+
+const randHostnameCharset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-"
+const randStringCharset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+var (
+	// Up to 15 characters; only letters, digits, and hyphens (with hyphens not at the start or end).
+	randHostnameRegex = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9-]{0,14}[a-zA-Z0-9]$`)
+)
+
+func RandomHostname() (hostname string) {
+	for {
+		// between 2 and 10 characters
+		if hostname = RandomStringFromCharset(randHostnameCharset, rand.Intn(8)+2); randHostnameRegex.MatchString(hostname) {
+			return
+		}
+	}
+}
+
+func RandomString() string {
+	return RandomStringFromCharset(randStringCharset, rand.Intn(10)+6)
+}
+
+func RandomStringFromCharset(charset string, length int) string {
+	b := make([]byte, length)
+	for i := range length {
+		b[i] = charset[rand.Intn(len(charset))]
+	}
+	return string(b)
+}
-- 
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