A password component for CakePHP 3. Allows generating a password which matches a given pattern.

PasswordComponent.php

<?php
namespace App\Controller\Component;
use Cake\Controller\Component;
use Cake\Auth\DefaultPasswordHasher;

class PasswordComponent extends Component {
	public function generate() {
		return $this->create_password('##CcC#C');
	}
	
	public function hash($password) {
		return (new DefaultPasswordHasher())->hash($password);
	}
	
	// http://www.bestcodingpractices.com/php_create_strong_random_passwords-27.html
	// Mask Rules
	// # - digit
	// C - Caps Character (A-Z)
	// c - Small Character (a-z)
	// X - Mixed Case Character (a-zA-Z)
	// ! - Custom Extended Characters
	private function create_password($mask) {
		   $extended_chars = "!@#$%^&*()";
		   $length = strlen($mask);
		   $pwd = '';
		   for ($c=0;$c<$length;$c++) {
		     $ch = $mask[$c];
		     switch ($ch) {
		       case '#':
			 $p_char = rand(0,9);
			 break;
		       case 'C':
			 $p_char = chr(rand(65,90));
			 break;
		       case 'c':
			 $p_char = chr(rand(97,122));
			 break;
		       case 'X':
			 do {
			   $p_char = rand(65,122);
			 } while ($p_char > 90 && $p_char < 97);
			 $p_char = chr($p_char);
			 break;
		       case '!':
			 $p_char = $extended_chars[rand(0,strlen($extended_chars)-1)];
			 break;
		     }
		     $pwd .= $p_char;
		   }
		   return $pwd; 
	}
}