rugk/threema-msgapi-sdk-php

<?php
/**
 * @author Threema GmbH
 * @copyright Copyright (c) 2015-2016 Threema GmbH
 */


namespace Threema\Console;

use Threema\Core\Exception;
use Threema\MsgApi\Constants;

class Common {
    /**
     * output a string, wrap at 100 chars
     *
     * @param string $string string to output
     * @param int $indent indent
     */
    public static function l($string = '', $indent = 0) {
        $pad = str_repeat('  ', $indent);
        echo $pad . wordwrap($string, 100, "\n" . $pad) . "\n";
    }

    /**
     * output a line
     *
     * @param string $string string to output
     */
    public static function ln($string = '') {
        echo $string . "\n";
    }

    /**
     * output a error message to the stderr
     *
     * @param string $msg
     */
    public static function e($msg) {
        $STDERR = fopen('php://stderr', 'w+');
        fwrite($STDERR, $msg."\n");

    }

    /**
     * check arguments for null, throws an exception on null or strlen == 0
     *
     * @params ...$things
     * @throws \Threema\Core\Exception
     */
    public static function required() {
        $argCount = func_num_args();
        for($n = 0; $n < $argCount; $n++) {
            $o = func_get_arg($n);
            if(null === $o || (is_scalar($o) && strlen($o) == 0)) {
                throw new Exception('invalid data');
            }
        }
    }

    /**
     * Append the prefix to the the PublicKey @key
     *
     * @param string $key PublicKey in hex
     * @return null|string
     */
    public static function convertPublicKey($key) {
        if(null !== $key) {
            return Constants::PUBLIC_KEY_PREFIX.$key;
        }
        return null;
    }

    /**
     * Extract the PublicKey
     *
     * @param string $stringWithPrefix PublicKey in hex with the key-prefix
     * @return null|string
     */
    public static function getPublicKey($stringWithPrefix = null) {
        if(null !== $stringWithPrefix && substr($stringWithPrefix, 0, strlen(Constants::PUBLIC_KEY_PREFIX)) == Constants::PUBLIC_KEY_PREFIX) {
            return substr($stringWithPrefix, strlen(Constants::PUBLIC_KEY_PREFIX));
        }
        return null;
    }

    /**
     * Append the prefix to the the PrivateKey @key
     *
     * @param string $key PrivateKey in hex
     * @return null|string
     */
    public static function convertPrivateKey($key) {
        if(null !== $key) {
            return Constants::PRIVATE_KEY_PREFIX.$key;
        }
        return null;
    }

    /**
     * Extract the PrivateKey
     *
     * @param string $stringWithPrefix PrivateKey in hex with the key-prefix (@Constants::PRIVATE_KEY_PREFIX)
     * @return null|string
     */
    public static function getPrivateKey($stringWithPrefix = null) {
        if(null !== $stringWithPrefix && substr($stringWithPrefix, 0, strlen(Constants::PRIVATE_KEY_PREFIX)) == Constants::PRIVATE_KEY_PREFIX) {
            return substr($stringWithPrefix, strlen(Constants::PRIVATE_KEY_PREFIX));
        }
        return null;
    }
}