1: <?php
 2: /**
 3:  * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 4:  * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 5:  *
 6:  * Licensed under The MIT License
 7:  * For full copyright and license information, please see the LICENSE.txt
 8:  * Redistributions of files must retain the above copyright notice.
 9:  *
10:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
11:  * @link          https://cakephp.org CakePHP(tm) Project
12:  * @since         2.0.0
13:  * @license       https://opensource.org/licenses/mit-license.php MIT License
14:  */
15: namespace Cake\Mailer;
16: 
17: use Cake\Core\InstanceConfigTrait;
18: 
19: /**
20:  * Abstract transport for sending email
21:  */
22: abstract class AbstractTransport
23: {
24:     use InstanceConfigTrait;
25: 
26:     /**
27:      * Default config for this class
28:      *
29:      * @var array
30:      */
31:     protected $_defaultConfig = [];
32: 
33:     /**
34:      * Send mail
35:      *
36:      * @param \Cake\Mailer\Email $email Email instance.
37:      * @return array
38:      */
39:     abstract public function send(Email $email);
40: 
41:     /**
42:      * Constructor
43:      *
44:      * @param array $config Configuration options.
45:      */
46:     public function __construct($config = [])
47:     {
48:         $this->setConfig($config);
49:     }
50: 
51:     /**
52:      * Help to convert headers in string
53:      *
54:      * @param array $headers Headers in format key => value
55:      * @param string $eol End of line string.
56:      * @return string
57:      */
58:     protected function _headersToString($headers, $eol = "\r\n")
59:     {
60:         $out = '';
61:         foreach ($headers as $key => $value) {
62:             if ($value === false || $value === null || $value === '') {
63:                 continue;
64:             }
65:             $out .= $key . ': ' . $value . $eol;
66:         }
67:         if (!empty($out)) {
68:             $out = substr($out, 0, -1 * strlen($eol));
69:         }
70: 
71:         return $out;
72:     }
73: }
74: