<?php

namespace App\Traits;

trait RandomTrait {
	public function generateRandomKey() {
		$rand = random_int( PHP_INT_MIN, PHP_INT_MAX );

		return str_shuffle( md5( $rand ) . $rand . $this->random_str() );
	}

	/**
	 * Generate a random string, using a cryptographically secure
	 * pseudorandom number generator (random_int)
	 *
	 * This function uses type hints now (PHP 7+ only), but it was originally
	 * written for PHP 5 as well.
	 *
	 * For PHP 7, random_int is a PHP core function
	 * For PHP 5.x, depends on https://github.com/paragonie/random_compat
	 *
	 * @param int $length How many characters do we want?
	 * @param string $keyspace A string of all possible characters
	 *                         to select from
	 *
	 * @return string
	 */
	public function random_str(
		int $length = 64,
		string $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
	): string {
		if ( $length < 1 ) {
			throw new RangeException( "Length must be a positive integer" );
		}
		$pieces = [];
		$max    = mb_strlen( $keyspace, '8bit' ) - 1;
		for ( $i = 0 ; $i < $length ; ++ $i ) {
			$pieces [] = $keyspace[ random_int( 0, $max ) ];
		}

		return implode( '', $pieces );
	}


}