Email.php

<?php
/**
 * Copyright (c) 2006-2012 Oliver Seidel (email : oliver.seidel @ deliciousdays.com)
 * Copyright (c) 2014-2017 Bastian Germann
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
namespace Cforms2;

class Email {

    public $html_show;
    public $html_show_ac;
    public $f_txt;
    public $f_html;
    public $err = '';
    public $subj = '';
    public $body = '';
    public $body_alt = '';
    public $to = array();
    private $content_type = 'text/plain';
    private $eol;
    private $from = '';
    private $fname;
    private $cc = array();
    private $bcc = array();
    private $replyto = array();
    private $up = array();
    private $err_count = 0;

    public function __construct($no, $from, $to, $replyto = '', $adminEmail = false) {
        $cformsSettings = get_option('cforms_settings');

        $this->eol = $cformsSettings['global']['cforms_crlf']['b'] != 1 ? "\r\n" : "\n";

        $this->html_show = substr($cformsSettings['form' . $no]['cforms' . $no . '_formdata'], 2, 1) == '1';
        $this->html_show_ac = substr($cformsSettings['form' . $no]['cforms' . $no . '_formdata'], 3, 1) == '1';

        $this->f_txt = substr($cformsSettings['form' . $no]['cforms' . $no . '_formdata'], 0, 1) == '1';
        $this->f_html = substr($cformsSettings['form' . $no]['cforms' . $no . '_formdata'], 1, 1) == '1';

        if ($from == '')
            $from = '"' . get_option('blogname') . '" <wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])) . '>';

        $fe = array();
        $f = array();
        if (preg_match('/([\w\-\+\.]+@([\w\-]+\.)+[\w\-]{2,63})/', $from, $fe))
            $this->from = $fe[0];

        if (preg_match('/(.*)\s+(([\w\-\.]+@|<)).*/', $from, $f))
            $this->fname = str_replace('"', '', $f[1]);
        else
            $this->fname = $fe[0];

        // reply-to
        $te = array();
        $t = array();
        if (preg_match('/([\w\-\+\.]+@([\w\-]+\.)+[\w\-]{2,63})/', $replyto, $te)) {
            if (preg_match('/(.*)\s+(([\w\-\+\.]+@|<)).*/', $replyto, $t))
                $this->add_reply($te[0], str_replace('"', '', $t[1]));
            else
                $this->add_reply($te[0]);
        }

        // bcc
        $te = array();
        $t = array();

        $addresses = explode(',', stripslashes($cformsSettings['form' . $no]['cforms' . $no . '_bcc']));
        foreach ($addresses as $a) {
            if (preg_match('/([\w\-+\.]+@([\w\-]+\.)+[\w\-]{2,63})/', $a, $te) && $adminEmail) {
                if (preg_match('/(.*)\s+(([\w\-+\.]+@|<)).*/', $a, $t))
                    $this->add_bcc($te[0], str_replace('"', '', $t[1]));
                else
                    $this->add_bcc($te[0]);
            }
        }


        // to
        $te = array();
        $t = array();
        $addresses = explode(',', $to);

        foreach ($addresses as $a) {
            if (preg_match('/([\w\-+\.]+@([\w\-]+\.)+[\w\-]{2,63})/', $a, $te)) {
                if (preg_match('/(.*)\s+(([\w\-+\.]+@|<)).*/', $a, $t))
                    $this->add_addr($te[0], str_replace('"', '', $t[1]));
                else
                    $this->add_addr($te[0]);
            }
        }

    }

    public function set_html($bool) {
        $this->content_type = $bool ? 'text/html' : 'text/plain';

    }

    private function add_addr($address, $name = '') {
        $t = count($this->to);
        $this->to[$t][0] = trim($address);
        $this->to[$t][1] = $name;

    }

    private function add_bcc($address, $name = '') {
        $t = count($this->bcc);
        $this->bcc[$t][0] = trim($address);
        $this->bcc[$t][1] = $name;

    }

    private function add_reply($address, $name = '') {
        $t = count($this->replyto);
        $this->replyto[$t][0] = trim($address);
        $this->replyto[$t][1] = $name;

    }

    private function addr_add($type, $addr) {
        $addr_str = $type . ': ';
        $addr_str .= $this->addr_fmt($addr[0]);
        if (count($addr) > 1) {
            for ($i = 1; $i < count($addr); $i++) {
                $addr_str .= ', ' . $this->addr_fmt($addr[$i]);
            }
        }
        return $addr_str;

    }

    private function addr_fmt($addr) {
        return empty($addr[1]) ? $this->fix_header($addr[0]) : $this->fix_header($addr[1]) . " <" . $this->fix_header($addr[0]) . ">";

    }

    private function fix_header($t) {
        $t = trim($t);
        $t = str_replace("\r", "", $t);
        return str_replace("\n", "", $t);

    }

    private function mail_header() {
        $r = array();

        $from = array();
        $from[0][0] = trim($this->from);
        $from[0][1] = $this->fname;
        $r[] = $this->addr_add('From', $from);

        $r[] = (count($this->cc) > 0) ? $this->addr_add('Cc', $this->cc) : '';
        $r[] = (count($this->bcc) > 0) ? $this->addr_add('Bcc', $this->bcc) : '';
        $r[] = (count($this->replyto) > 0) ? $this->addr_add('Reply-to', $this->replyto) : '';

        $r[] = sprintf("Content-Type: %s", $this->content_type);
        return $r;

    }

    private function mail_body($body) {
        if ($this->err_count > 0)
            return '';

        $unix_line_body = str_replace('\r\n', '\n', $body);
        $unix_line_body = str_replace('\r', '\n', $unix_line_body);
        return str_replace('\n', $this->eol, $unix_line_body);

    }

    public function send() {
        $this->err_count = 0;

        if ((count($this->to) + count($this->cc) + count($this->bcc)) < 1) {
            $this->set_err(__('You must provide at least one recipient email address.', 'cforms2'));
            return false;
        }

        $header = $this->mail_header();
        $body = $this->mail_body($this->body);

        // bail out
        if ($body == '')
            return false;

        $to = '';
        for ($i = 0; $i < count($this->to); $i++) {
            $to .= (($i != 0) ? ', ' : '' ) . $this->addr_fmt($this->to[$i]);
        }
        add_action('phpmailer_init', array($this, 'phpmailer_init'));
        $rt = wp_mail($to, $this->fix_header($this->subj), $body, $header, $this->up);
        remove_action('phpmailer_init', array($this, 'phpmailer_init'));

        if (!$rt) {
            $this->set_err(__('Could not successfully run wp_mail function. There may be a warning in the PHP error log with more information.', 'cforms2'));
            return false;
        }

        return true;

    }

    /**
     * Sets the line ending and the multipart/alternative text/plain part.
     * This is only functional if the built-in wp_mail function is not replaced.
     * 
     * TODO When https://core.trac.wordpress.org/ticket/15448 is resolved,
     * use wp_mail's new multipart detection and do not depend on PHPMailer.
     * 
     * @param PHPMailer $phpmailer the object in use
     */
    public function phpmailer_init($phpmailer) {
        $phpmailer->LE = $this->eol;
        $phpmailer->AltBody = $this->mail_body($this->body_alt);

    }

    public function add_file($path) {
        if (!is_file($path)) {
            $this->set_err(__('Could not access file: ', 'cforms2'));
        }

        $t = count($this->up);
        $this->up[$t] = $path;

    }

    private function set_err($m) {
        $this->err = $m;
        $this->err_count++;

    }

}