File email/configuration.php

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<?php

namespace SIW\Email;

use SIW\Properties;

/**
 * Configuratie van e-mail
 * 
 * - SMTP
 * - DKIM
 * - Mailjet tracking
 * - Afzender
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 */
class Configuration {

    /**
     * Init
     */
    public static function init() {
        $self = new self();
        add_action( 'phpmailer_init', [ $self, 'set_smtp_configuration' ], PHP_INT_MAX );
        add_action( 'phpmailer_init', [ $self, 'set_dkim_configuration' ], PHP_INT_MAX );
        add_action( 'phpmailer_init', [ $self, 'set_mailjet_tracking' ], PHP_INT_MAX );
        add_action( 'phpmailer_init', [ $self, 'set_antispam_header' ], PHP_INT_MAX );
        add_filter( 'wp_mail_from', [ $self, 'set_mail_from' ] );
        add_filter( 'wp_mail_from_name', [ $self, 'set_mail_from_name' ] );
    }

    /**
     * Zet SMTP-instellingen
     *
     * @param \PHPMailer $phpmailer
     */
    public function set_smtp_configuration( \PHPMailer $phpmailer ) {
        /*SMTP-configuratie*/
        if ( siw_get_option( 'smtp_enabled' ) ) {
            $phpmailer->isSMTP();
            $smtp_settings = siw_get_option( 'smtp_settings');
            $phpmailer->Host = $smtp_settings['host'];
            $phpmailer->Port = $smtp_settings['port'];
            $phpmailer->SMTPAuth = (bool) $smtp_settings['authentication'];
            $phpmailer->Username = $smtp_settings['username'];
            $phpmailer->Password = $smtp_settings['password'];
            $phpmailer->SMTPSecure = $smtp_settings['encryption'];
            $phpmailer->Sender = $phpmailer->From;
        }
    }

    /**
     * Zet DKIM-signing
     *
     * @param \PHPMailer $phpmailer
     */
    public function set_dkim_configuration( \PHPMailer $phpmailer ) {
        if ( siw_get_option( 'dkim_enabled' ) && defined( 'SIW_DKIM_PASSPHRASE' ) ) {
            $dkim_settings = siw_get_option( 'dkim_settings');
            $phpmailer->DKIM_selector = $dkim_settings['selector'];
            $phpmailer->DKIM_domain = $dkim_settings['domain'];
            $phpmailer->DKIM_identity = $phpmailer->From;
            $phpmailer->DKIM_passphrase = SIW_DKIM_PASSPHRASE;
            $phpmailer->DKIM_private_string = $dkim_settings['key'];
        }
    }

    /**
     * Zet tracking van Mailjet aan of uit
     *
     * @param \PHPMailer $phpmailer
     * 
     * @todo optie voor maken
     */
    public function set_mailjet_tracking( \PHPMailer $phpmailer ) {
        $phpmailer->addCustomHeader( 'X-Mailjet-TrackOpen', 0 );
        $phpmailer->addCustomHeader( 'X-Mailjet-TrackClick', 0 );
    }
    
    /**
     * Zet header t.b.v. spamfilter Office-365
     *
     * @param \PHPMailer $phpmailer
     *
     * @todo optie voor waarde maken
     */
    public function set_antispam_header( \PHPMailer $phpmailer ) {
        $phpmailer->addCustomHeader( 'X-SIW-WebsiteMail', 1 );
    }

    /**
     * Zet het afzenderadres (indien nog niet gezet)
     *
     * @param string $from
     * @return string
     */
    public function set_mail_from( string $from ) {
        $sitename = strtolower( $_SERVER['SERVER_NAME'] );
        if ( substr( $sitename, 0, 4 ) == 'www.' ) {
            $sitename = substr( $sitename, 4 );
        }
        $default_from = 'wordpress@' . $sitename;
    
        if ( $from != $default_from ) {
            return $from;
        }
    
        return Properties::EMAIL;
    }

    /**
     * Zet de afzendernaam (indien nog niet gezet)
     *
     * @param string $from_name
     * @return string
     */
    public function set_mail_from_name( string $from_name ) {
        $default_from_name = 'WordPress';
        if ( $from_name != $default_from_name ) {
            return $from_name;
        }

        return Properties::NAME;
    }
}

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