obscureString method

String obscureString(String input, { int minLength = 5, })

Obscures sensitive string data by showing only partial characters.

For strings with minLength+ characters: shows first 3 and last 2 characters. For shorter strings: shows first and last character. Single character strings are returned unchanged. minLength defines the minimum length to apply the obscure logic (default: 5).

Implementation

String obscureString(String input, {int minLength = 5}) {
  final int length = input.length;

  if (length <= 1) return input;

  if (length <= minLength) {
    return input[0] + '*' * (length - 2) + input[length - 1];
  }

  // For strings longer than minLength, show the first 3 and last 2 characters
  return "${input.substring(0, 3)}${'*' * (length - 5)}${input.substring(length - 2)}";
}