MailUtility.php

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<?php
namespace TYPO3\CMS\Core\Utility;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class MailUtility
{
    public static function getSystemFrom()
    {
        $address = self::getSystemFromAddress();
        $name = self::getSystemFromName();
        if (!$address) {
            return null;
        } elseif ($name) {
            return [$address => $name];
        } else {
            return [$address];
        }
    }

    public static function getSystemFromName()
    {
        if ($GLOBALS['TYPO3_CONF_VARS']['MAIL']['defaultMailFromName']) {
            return $GLOBALS['TYPO3_CONF_VARS']['MAIL']['defaultMailFromName'];
        } else {
            return null;
        }
    }

    public static function getSystemFromAddress()
    {
        // default, first check the localconf setting
        $address = $GLOBALS['TYPO3_CONF_VARS']['MAIL']['defaultMailFromAddress'];
        if (!GeneralUtility::validEmail($address)) {
            // just get us a domain record we can use as the host
            $host = '';
            $domainRecord = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('domainName', 'sys_domain', 'hidden = 0', '', 'pid ASC, sorting ASC');
            if (!empty($domainRecord['domainName'])) {
                $tempUrl = $domainRecord['domainName'];
                if (!GeneralUtility::isFirstPartOfStr($tempUrl, 'http')) {
                    // shouldn't be the case anyways, but you never know
                    // ... there're crazy people out there
                    $tempUrl = 'http://' . $tempUrl;
                }
                $host = parse_url($tempUrl, PHP_URL_HOST);
            }
            $address = 'no-reply@' . $host;
            if (!GeneralUtility::validEmail($address)) {
                // still nothing, get host name from server
                $address = 'no-reply@' . php_uname('n');
                if (!GeneralUtility::validEmail($address)) {
                    // if everything fails use a dummy address
                    $address = 'no-reply@example.com';
                }
            }
        }
        return $address;
    }

    public static function breakLinesForEmail($str, $newlineChar = LF, $lineWidth = 76)
    {
        $lines = [];
        $substrStart = 0;
        while (strlen($str) > $substrStart) {
            $substr = substr($str, $substrStart, $lineWidth);
            // has line exceeded (reached) the maximum width?
            if (strlen($substr) == $lineWidth) {
                // find last space-char
                $spacePos = strrpos(rtrim($substr), ' ');
                // space-char found?
                if ($spacePos !== false) {
                    // take everything up to last space-char
                    $theLine = substr($substr, 0, $spacePos);
                    $substrStart++;
                } else {
                    // search for space-char in remaining text
                    // makes this line longer than $lineWidth!
                    $afterParts = explode(' ', substr($str, $lineWidth + $substrStart), 2);
                    $theLine = $substr . $afterParts[0];
                }
                if ($theLine === '') {
                    // prevent endless loop because of empty line
                    break;
                }
            } else {
                $theLine = $substr;
            }
            $lines[] = trim($theLine);
            $substrStart += strlen($theLine);
            if (trim(substr($str, $substrStart, $lineWidth)) === '') {
                // no more text
                break;
            }
        }
        return implode($newlineChar, $lines);
    }

    public static function parseAddresses($rawAddresses)
    {
        $addressParser = GeneralUtility::makeInstance(
            \TYPO3\CMS\Core\Mail\Rfc822AddressesParser::class,
            $rawAddresses
        );
        $addresses = $addressParser->parseAddressList();
        $addressList = [];
        foreach ($addresses as $address) {
            if ($address->mailbox === '') {
                continue;
            }
            if ($address->personal) {
                // item with name found ( name <email@example.org> )
                $addressList[$address->mailbox . '@' . $address->host] = $address->personal;
            } else {
                // item without name found ( email@example.org )
                $addressList[] = $address->mailbox . '@' . $address->host;
            }
        }
        return $addressList;
    }
}