clean up

common.go

@@ -1,7 +1,11 @@
 package main
 
 import (
+	"crypto/rand"
+	"encoding/base64"
 	"html/template"
+	"log"
+	"strings"
 )
 
 var (
@@ -15,3 +19,33 @@ var (
 		},
 	}
 )
+
+func generateStrongRandomString(length int) string {
+	bytes := make([]byte, length)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		log.Fatalf("Error generating random string: %v", err)
+	}
+	return base64.URLEncoding.EncodeToString(bytes)[:length]
+}
+
+// Checks if the URL already includes a protocol
+func hasProtocol(url string) bool {
+	return strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://")
+}
+
+// Checks if the domain is a local address
+func isLocalAddress(domain string) bool {
+	return domain == "localhost" || strings.HasPrefix(domain, "127.") || strings.HasPrefix(domain, "192.168.") || strings.HasPrefix(domain, "10.")
+}
+
+// Ensures that HTTP or HTTPS is befor the adress if needed
+func addProtocol(domain string) string {
+	if hasProtocol(domain) {
+		return domain
+	}
+	if isLocalAddress(domain) {
+		return "http://" + domain
+	}
+	return "https://" + domain
+}