1 files changed, 37 insertions, 0 deletions
diff --git a/internal/player/validate.go b/internal/player/validate.go
new file mode 100644
index 0000000..63f40d2
--- /dev/null
+++ b/internal/player/validate.go
@@ -0,0 +1,37 @@
+package player
+
+import (
+	"fmt"
+	"regexp"
+	"unicode"
+)
+
+var validNameRE = regexp.MustCompile(`^[A-Za-z0-9 ]{1,30}$`)
+
+func ValidName(name string) error {
+	if !validNameRE.MatchString(name) {
+		return fmt.Errorf("name must be 1-30 alphanumeric characters or spaces")
+	}
+	return nil
+}
+
+func ValidPassword(pw string) error {
+	if len(pw) > 128 {
+		return fmt.Errorf("Password too long.")
+	}
+	return nil
+}
+
+func StripControl(input string) string {
+	runes := make([]rune, 0, len(input))
+	for _, r := range input {
+		if r == '\n' || r == '\t' {
+			continue
+		}
+		if unicode.IsControl(r) {
+			continue
+		}
+		runes = append(runes, r)
+	}
+	return string(runes)
+}