Sanitize+truncate display names on registration+change. For #2527

utils/strings.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"strings"
+
+	"github.com/microcosm-cc/bluemonday"
+)
+
+// StripHTML will strip HTML tags from a string.
+func StripHTML(s string) string {
+	p := bluemonday.NewPolicy()
+	return p.Sanitize(s)
+}
+
+// MakeSafeStringOfLength will take a string and strip HTML tags,
+// trim whitespace, and limit the length.
+func MakeSafeStringOfLength(s string, length int) string {
+	newString := s
+	newString = StripHTML(newString)
+
+	if len(newString) > length {
+		newString = newString[:length]
+	}
+
+	newString = strings.ReplaceAll(newString, "\r", "")
+	newString = strings.TrimSpace(newString)
+
+	return newString
+}