<?php

/**
 * 权限处理器
 * Class Auth
 */
class Auth
{
	/**
     * time
     *
     * @var int
     */
    const TIME = 300;

    /**
     * signature
     *
     * @return mixed
     */
    public static function signature($request = array(), $type = 'sha1', $suffix = '', $empty = true)
    {
        ksort($request);

        $signature_string = '';
        foreach ($request as $k => $v) {
            if (strstr($v, 'http') && !strstr($v, '%')) {
                $v = urlencode($v);
            }
            if (!$empty) {
                $signature_string .= $k . '=' . $v . '&';
            } elseif (strlen($v) && $v != 'empty') {
                $signature_string .= $k . '=' . $v . '&';
            }
        }
        if ($suffix != '&') {
            $signature_string = substr($signature_string, 0, -1) . $suffix;
        }
        
        return $type($signature_string);
    }

    /**
     * nonce
     *
     * @return mixed
     */
    public static function nonce()
    {
        return substr(sha1(microtime()), rand(10, 15));
    }

    /**
     * timestamp
     *
     * @return mixed
     */
    public static function timestamp()
    {
        list($msec, $sec) = explode(' ', microtime());
        $msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
        return $msectime;
    }
}