Initial commit: Open sourcing all of the Maple Open Technologies code.

native/desktop/maplefile/internal/utils/email.go

@@ -0,0 +1,57 @@
+package utils
+
+import "strings"
+
+// MaskEmail masks an email address for logging purposes.
+// Example: "user@example.com" becomes "u***@e***.com"
+// This preserves enough information for debugging while protecting privacy.
+func MaskEmail(email string) string {
+	if email == "" {
+		return ""
+	}
+
+	parts := strings.Split(email, "@")
+	if len(parts) != 2 {
+		// Not a valid email format, mask most of it
+		if len(email) <= 2 {
+			return "***"
+		}
+		return string(email[0]) + "***"
+	}
+
+	localPart := parts[0]
+	domainPart := parts[1]
+
+	// Mask local part: show first character, mask the rest
+	maskedLocal := maskPart(localPart)
+
+	// Mask domain: show first character of domain name, mask rest, keep TLD
+	maskedDomain := maskDomain(domainPart)
+
+	return maskedLocal + "@" + maskedDomain
+}
+
+// maskPart masks a string showing only the first character
+func maskPart(s string) string {
+	if len(s) == 0 {
+		return "***"
+	}
+	if len(s) == 1 {
+		return s + "***"
+	}
+	return string(s[0]) + "***"
+}
+
+// maskDomain masks the domain part, preserving the TLD
+func maskDomain(domain string) string {
+	lastDot := strings.LastIndex(domain, ".")
+	if lastDot == -1 {
+		// No TLD found, just mask it
+		return maskPart(domain)
+	}
+
+	domainName := domain[:lastDot]
+	tld := domain[lastDot:] // includes the dot
+
+	return maskPart(domainName) + tld
+}