Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/pkg/mutil/mask/mask.go

@@ -0,0 +1,29 @@
+package mask
+
+import "strings"
+
+func Email(email string) string {
+	parts := strings.Split(email, "@")
+	if len(parts) != 2 {
+		return email
+	}
+	local := parts[0]
+	if len(local) > 2 {
+		local = local[:1] + "***" + local[len(local)-1:]
+	} else {
+		local = local[:1] + "***"
+	}
+	return local + "@" + parts[1]
+}
+
+func Emails(emails []string) []string {
+	if emails == nil {
+		return nil
+	}
+
+	masked := make([]string, len(emails))
+	for i, email := range emails {
+		masked[i] = Email(email)
+	}
+	return masked
+}