woocommerce/woocommerce

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includes/emails/class-wc-email.php

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<?php
/**
 * Class WC_Email file.
 *
 * @package WooCommerce\Emails
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

if ( class_exists( 'WC_Email', false ) ) {
    return;
}

/**
 * Email Class
 *
 * WooCommerce Email Class which is extended by specific email template classes to add emails to WooCommerce
 *
 * @class       WC_Email
 * @version     2.5.0
 * @package     WooCommerce\Classes\Emails
 * @extends     WC_Settings_API
 */
class WC_Email extends WC_Settings_API {

    /**
     * Email method ID.
     *
     * @var String
     */
    public $id;

    /**
     * Email method title.
     *
     * @var string
     */
    public $title;

    /**
     * 'yes' if the method is enabled.
     *
     * @var string yes, no
     */
    public $enabled;

    /**
     * Description for the email.
     *
     * @var string
     */
    public $description;

    /**
     * Default heading.
     *
     * Supported for backwards compatibility but we recommend overloading the
     * get_default_x methods instead so localization can be done when needed.
     *
     * @var string
     */
    public $heading = '';

    /**
     * Default subject.
     *
     * Supported for backwards compatibility but we recommend overloading the
     * get_default_x methods instead so localization can be done when needed.
     *
     * @var string
     */
    public $subject = '';

    /**
     * Plain text template path.
     *
     * @var string
     */
    public $template_plain;

    /**
     * HTML template path.
     *
     * @var string
     */
    public $template_html;

    /**
     * Template path.
     *
     * @var string
     */
    public $template_base;

    /**
     * Recipients for the email.
     *
     * @var string
     */
    public $recipient;

    /**
     * Object this email is for, for example a customer, product, or email.
     *
     * @var object|bool
     */
    public $object;

    /**
     * Mime boundary (for multipart emails).
     *
     * @var string
     */
    public $mime_boundary;

    /**
     * Mime boundary header (for multipart emails).
     *
     * @var string
     */
    public $mime_boundary_header;

    /**
     * True when email is being sent.
     *
     * @var bool
     */
    public $sending;

    /**
     * True when the email notification is sent manually only.
     *
     * @var bool
     */
    protected $manual = false;

    /**
     * True when the email notification is sent to customers.
     *
     * @var bool
     */
    protected $customer_email = false;

    /**
     *  List of preg* regular expression patterns to search for,
     *  used in conjunction with $plain_replace.
     *  https://raw.github.com/ushahidi/wp-silcc/master/class.html2text.inc
     *
     *  @var array $plain_search
     *  @see $plain_replace
     */
    public $plain_search = array(
        "/\r/",                                                  // Non-legal carriage return.
        '/&(nbsp|#0*160);/i',                                    // Non-breaking space.
        '/&(quot|rdquo|ldquo|#0*8220|#0*8221|#0*147|#0*148);/i', // Double quotes.
        '/&(apos|rsquo|lsquo|#0*8216|#0*8217);/i',               // Single quotes.
        '/&gt;/i',                                               // Greater-than.
        '/&lt;/i',                                               // Less-than.
        '/&#0*38;/i',                                            // Ampersand.
        '/&amp;/i',                                              // Ampersand.
        '/&(copy|#0*169);/i',                                    // Copyright.
        '/&(trade|#0*8482|#0*153);/i',                           // Trademark.
        '/&(reg|#0*174);/i',                                     // Registered.
        '/&(mdash|#0*151|#0*8212);/i',                           // mdash.
        '/&(ndash|minus|#0*8211|#0*8722);/i',                    // ndash.
        '/&(bull|#0*149|#0*8226);/i',                            // Bullet.
        '/&(pound|#0*163);/i',                                   // Pound sign.
        '/&(euro|#0*8364);/i',                                   // Euro sign.
        '/&(dollar|#0*36);/i',                                   // Dollar sign.
        '/&[^&\s;]+;/i',                                         // Unknown/unhandled entities.
        '/[ ]{2,}/',                                             // Runs of spaces, post-handling.
    );

    /**
     *  List of pattern replacements corresponding to patterns searched.
     *
     *  @var array $plain_replace
     *  @see $plain_search
     */
    public $plain_replace = array(
        '',                                             // Non-legal carriage return.
        ' ',                                            // Non-breaking space.
        '"',                                            // Double quotes.
        "'",                                            // Single quotes.
        '>',                                            // Greater-than.
        '<',                                            // Less-than.
        '&',                                            // Ampersand.
        '&',                                            // Ampersand.
        '(c)',                                          // Copyright.
        '(tm)',                                         // Trademark.
        '(R)',                                          // Registered.
        '--',                                           // mdash.
        '-',                                            // ndash.
        '*',                                            // Bullet.
        '£',                                            // Pound sign.
        'EUR',                                          // Euro sign. € ?.
        '$',                                            // Dollar sign.
        '',                                             // Unknown/unhandled entities.
        ' ',                                             // Runs of spaces, post-handling.
    );

    /**
     * Strings to find/replace in subjects/headings.
     *
     * @var array
     */
    protected $placeholders = array();

    /**
     * Strings to find in subjects/headings.
     *
     * @deprecated 3.2.0 in favour of placeholders
     * @var array
     */
    public $find = array();

    /**
     * Strings to replace in subjects/headings.
     *
     * @deprecated 3.2.0 in favour of placeholders
     * @var array
     */
    public $replace = array();

    /**
     * Constructor.
     */
    public function __construct() {
        // Find/replace.
        $this->placeholders = array_merge(
            array(
                '{site_title}'   => $this->get_blogname(),
                '{site_address}' => wp_parse_url( home_url(), PHP_URL_HOST ),
                '{site_url}'     => wp_parse_url( home_url(), PHP_URL_HOST ),
            ),
            $this->placeholders
        );

        // Init settings.
        $this->init_form_fields();
        $this->init_settings();

        // Default template base if not declared in child constructor.
        if ( is_null( $this->template_base ) ) {
            $this->template_base = WC()->plugin_path() . '/templates/';
        }

        $this->email_type = $this->get_option( 'email_type' );
        $this->enabled    = $this->get_option( 'enabled' );

        add_action( 'phpmailer_init', array( $this, 'handle_multipart' ) );
        add_action( 'woocommerce_update_options_email_' . $this->id, array( $this, 'process_admin_options' ) );
    }

    /**
     * Handle multipart mail.
     *
     * @param  PHPMailer $mailer PHPMailer object.
     * @return PHPMailer
     */
    public function handle_multipart( $mailer ) {
        if ( $this->sending && 'multipart' === $this->get_email_type() ) {
            $mailer->AltBody = wordwrap( // phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
                preg_replace( $this->plain_search, $this->plain_replace, wp_strip_all_tags( $this->get_content_plain() ) )
            );
            $this->sending   = false;
        }
        return $mailer;
    }

    /**
     * Format email string.
     *
     * @param mixed $string Text to replace placeholders in.
     * @return string
     */
    public function format_string( $string ) {
        $find    = array_keys( $this->placeholders );
        $replace = array_values( $this->placeholders );

        // If using legacy find replace, add those to our find/replace arrays first. @todo deprecate in 4.0.0.
        $find    = array_merge( (array) $this->find, $find );
        $replace = array_merge( (array) $this->replace, $replace );

        // Take care of blogname which is no longer defined as a valid placeholder.
        $find[]    = '{blogname}';
        $replace[] = $this->get_blogname();

        // If using the older style filters for find and replace, ensure the array is associative and then pass through filters. @todo deprecate in 4.0.0.
        if ( has_filter( 'woocommerce_email_format_string_replace' ) || has_filter( 'woocommerce_email_format_string_find' ) ) {
            $legacy_find    = $this->find;
            $legacy_replace = $this->replace;

            foreach ( $this->placeholders as $find => $replace ) {
                $legacy_key                    = sanitize_title( str_replace( '_', '-', trim( $find, '{}' ) ) );
                $legacy_find[ $legacy_key ]    = $find;
                $legacy_replace[ $legacy_key ] = $replace;
            }

            $string = str_replace( apply_filters( 'woocommerce_email_format_string_find', $legacy_find, $this ), apply_filters( 'woocommerce_email_format_string_replace', $legacy_replace, $this ), $string );
        }

        /**
         * Filter for main find/replace.
         *
         * @since 3.2.0
         */
        return apply_filters( 'woocommerce_email_format_string', str_replace( $find, $replace, $string ), $this );
    }

    /**
     * Set the locale to the store locale for customer emails to make sure emails are in the store language.
     */
    public function setup_locale() {
        if ( $this->is_customer_email() && apply_filters( 'woocommerce_email_setup_locale', true ) ) {
            wc_switch_to_site_locale();
        }
    }

    /**
     * Restore the locale to the default locale. Use after finished with setup_locale.
     */
    public function restore_locale() {
        if ( $this->is_customer_email() && apply_filters( 'woocommerce_email_restore_locale', true ) ) {
            wc_restore_locale();
        }
    }

    /**
     * Get email subject.
     *
     * @since  3.1.0
     * @return string
     */
    public function get_default_subject() {
        return $this->subject;
    }

    /**
     * Get email heading.
     *
     * @since  3.1.0
     * @return string
     */
    public function get_default_heading() {
        return $this->heading;
    }

    /**
     * Default content to show below main email content.
     *
     * @since 3.7.0
     * @return string
     */
    public function get_default_additional_content() {
        return '';
    }

    /**
     * Return content from the additional_content field.
     *
     * Displayed above the footer.
     *
     * @since 3.7.0
     * @return string
     */
    public function get_additional_content() {
        $content = $this->get_option( 'additional_content', '' );

        return apply_filters( 'woocommerce_email_additional_content_' . $this->id, $this->format_string( $content ), $this->object, $this );
    }

    /**
     * Get email subject.
     *
     * @return string
     */
    public function get_subject() {
        return apply_filters( 'woocommerce_email_subject_' . $this->id, $this->format_string( $this->get_option( 'subject', $this->get_default_subject() ) ), $this->object, $this );
    }

    /**
     * Get email heading.
     *
     * @return string
     */
    public function get_heading() {
        return apply_filters( 'woocommerce_email_heading_' . $this->id, $this->format_string( $this->get_option( 'heading', $this->get_default_heading() ) ), $this->object, $this );
    }

    /**
     * Get valid recipients.
     *
     * @return string
     */
    public function get_recipient() {
        $recipient  = apply_filters( 'woocommerce_email_recipient_' . $this->id, $this->recipient, $this->object, $this );
        $recipients = array_map( 'trim', explode( ',', $recipient ) );
        $recipients = array_filter( $recipients, 'is_email' );
        return implode( ', ', $recipients );
    }

    /**
     * Get email headers.
     *
     * @return string
     */
    public function get_headers() {
        $header = 'Content-Type: ' . $this->get_content_type() . "\r\n";

        if ( in_array( $this->id, array( 'new_order', 'cancelled_order', 'failed_order' ), true ) ) {
            if ( $this->object && $this->object->get_billing_email() && ( $this->object->get_billing_first_name() || $this->object->get_billing_last_name() ) ) {
                $header .= 'Reply-to: ' . $this->object->get_billing_first_name() . ' ' . $this->object->get_billing_last_name() . ' <' . $this->object->get_billing_email() . ">\r\n";
            }
        } elseif ( $this->get_from_address() && $this->get_from_name() ) {
            $header .= 'Reply-to: ' . $this->get_from_name() . ' <' . $this->get_from_address() . ">\r\n";
        }

        return apply_filters( 'woocommerce_email_headers', $header, $this->id, $this->object, $this );
    }

    /**
     * Get email attachments.
     *
     * @return array
     */
    public function get_attachments() {
        return apply_filters( 'woocommerce_email_attachments', array(), $this->id, $this->object, $this );
    }

    /**
     * Return email type.
     *
     * @return string
     */
    public function get_email_type() {
        return $this->email_type && class_exists( 'DOMDocument' ) ? $this->email_type : 'plain';
    }

    /**
     * Get email content type.
     *
     * @param string $default_content_type Default wp_mail() content type.
     * @return string
     */
    public function get_content_type( $default_content_type = '' ) {
        switch ( $this->get_email_type() ) {
            case 'html':
                $content_type = 'text/html';
                break;
            case 'multipart':
                $content_type = 'multipart/alternative';
                break;
            default:
                $content_type = 'text/plain';
                break;
        }

        return apply_filters( 'woocommerce_email_content_type', $content_type, $this, $default_content_type );
    }

    /**
     * Return the email's title
     *
     * @return string
     */
    public function get_title() {
        return apply_filters( 'woocommerce_email_title', $this->title, $this );
    }

    /**
     * Return the email's description
     *
     * @return string
     */
    public function get_description() {
        return apply_filters( 'woocommerce_email_description', $this->description, $this );
    }

    /**
     * Proxy to parent's get_option and attempt to localize the result using gettext.
     *
     * @param string $key Option key.
     * @param mixed  $empty_value Value to use when option is empty.
     * @return string
     */
    public function get_option( $key, $empty_value = null ) {
        $value = parent::get_option( $key, $empty_value );
        return apply_filters( 'woocommerce_email_get_option', $value, $this, $value, $key, $empty_value );
    }

    /**
     * Checks if this email is enabled and will be sent.
     *
     * @return bool
     */
    public function is_enabled() {
        return apply_filters( 'woocommerce_email_enabled_' . $this->id, 'yes' === $this->enabled, $this->object, $this );
    }

    /**
     * Checks if this email is manually sent
     *
     * @return bool
     */
    public function is_manual() {
        return $this->manual;
    }

    /**
     * Checks if this email is customer focussed.
     *
     * @return bool
     */
    public function is_customer_email() {
        return $this->customer_email;
    }

    /**
     * Get WordPress blog name.
     *
     * @return string
     */
    public function get_blogname() {
        return wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
    }

    /**
     * Get email content.
     *
     * @return string
     */
    public function get_content() {
        $this->sending = true;

        if ( 'plain' === $this->get_email_type() ) {
            $email_content = wordwrap( preg_replace( $this->plain_search, $this->plain_replace, wp_strip_all_tags( $this->get_content_plain() ) ), 70 );
        } else {
            $email_content = $this->get_content_html();
        }

        return $email_content;
    }

    /**
     * Apply inline styles to dynamic content.
     *
     * We only inline CSS for html emails, and to do so we use Emogrifier library (if supported).
     *
     * @version 4.0.0
     * @param string|null $content Content that will receive inline styles.
     * @return string
     */
    public function style_inline( $content ) {
        if ( in_array( $this->get_content_type(), array( 'text/html', 'multipart/alternative' ), true ) ) {
            ob_start();
            wc_get_template( 'emails/email-styles.php' );
            $css = apply_filters( 'woocommerce_email_styles', ob_get_clean(), $this );

            $emogrifier_class = 'Pelago\\Emogrifier';

            if ( $this->supports_emogrifier() && class_exists( $emogrifier_class ) ) {
                try {
                    $emogrifier = new $emogrifier_class( $content, $css );

                    do_action( 'woocommerce_emogrifier', $emogrifier, $this );

                    $content    = $emogrifier->emogrify();
                    $html_prune = \Pelago\Emogrifier\HtmlProcessor\HtmlPruner::fromHtml( $content );
                    $html_prune->removeElementsWithDisplayNone();
                    $content    = $html_prune->render();
                } catch ( Exception $e ) {
                    $logger = wc_get_logger();
                    $logger->error( $e->getMessage(), array( 'source' => 'emogrifier' ) );
                }
            } else {
                $content = '<style type="text/css">' . $css . '</style>' . $content;
            }
        }

        return $content;
    }

    /**
     * Return if emogrifier library is supported.
     *
     * @version 4.0.0
     * @since 3.5.0
     * @return bool
     */
    protected function supports_emogrifier() {
        return class_exists( 'DOMDocument' );
    }

    /**
     * Get the email content in plain text format.
     *
     * @return string
     */
    public function get_content_plain() {
        return ''; }

    /**
     * Get the email content in HTML format.
     *
     * @return string
     */
    public function get_content_html() {
        return ''; }

    /**
     * Get the from name for outgoing emails.
     *
     * @param string $from_name Default wp_mail() name associated with the "from" email address.
     * @return string
     */
    public function get_from_name( $from_name = '' ) {
        $from_name = apply_filters( 'woocommerce_email_from_name', get_option( 'woocommerce_email_from_name' ), $this, $from_name );
        return wp_specialchars_decode( esc_html( $from_name ), ENT_QUOTES );
    }

    /**
     * Get the from address for outgoing emails.
     *
     * @param string $from_email Default wp_mail() email address to send from.
     * @return string
     */
    public function get_from_address( $from_email = '' ) {
        $from_email = apply_filters( 'woocommerce_email_from_address', get_option( 'woocommerce_email_from_address' ), $this, $from_email );
        return sanitize_email( $from_email );
    }

    /**
     * Send an email.
     *
     * @param string $to Email to.
     * @param string $subject Email subject.
     * @param string $message Email message.
     * @param string $headers Email headers.
     * @param array  $attachments Email attachments.
     * @return bool success
     */
    public function send( $to, $subject, $message, $headers, $attachments ) {
        add_filter( 'wp_mail_from', array( $this, 'get_from_address' ) );
        add_filter( 'wp_mail_from_name', array( $this, 'get_from_name' ) );
        add_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );

        $message              = apply_filters( 'woocommerce_mail_content', $this->style_inline( $message ) );
        $mail_callback        = apply_filters( 'woocommerce_mail_callback', 'wp_mail', $this );
        $mail_callback_params = apply_filters( 'woocommerce_mail_callback_params', array( $to, $subject, $message, $headers, $attachments ), $this );
        $return               = $mail_callback( ...$mail_callback_params );

        remove_filter( 'wp_mail_from', array( $this, 'get_from_address' ) );
        remove_filter( 'wp_mail_from_name', array( $this, 'get_from_name' ) );
        remove_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );

        return $return;
    }

    /**
     * Initialise Settings Form Fields - these are generic email options most will use.
     */
    public function init_form_fields() {
        /* translators: %s: list of placeholders */
        $placeholder_text  = sprintf( __( 'Available placeholders: %s', 'woocommerce' ), '<code>' . esc_html( implode( '</code>, <code>', array_keys( $this->placeholders ) ) ) . '</code>' );
        $this->form_fields = array(
            'enabled'            => array(
                'title'   => __( 'Enable/Disable', 'woocommerce' ),
                'type'    => 'checkbox',
                'label'   => __( 'Enable this email notification', 'woocommerce' ),
                'default' => 'yes',
            ),
            'subject'            => array(
                'title'       => __( 'Subject', 'woocommerce' ),
                'type'        => 'text',
                'desc_tip'    => true,
                'description' => $placeholder_text,
                'placeholder' => $this->get_default_subject(),
                'default'     => '',
            ),
            'heading'            => array(
                'title'       => __( 'Email heading', 'woocommerce' ),
                'type'        => 'text',
                'desc_tip'    => true,
                'description' => $placeholder_text,
                'placeholder' => $this->get_default_heading(),
                'default'     => '',
            ),
            'additional_content' => array(
                'title'       => __( 'Additional content', 'woocommerce' ),
                'description' => __( 'Text to appear below the main email content.', 'woocommerce' ) . ' ' . $placeholder_text,
                'css'         => 'width:400px; height: 75px;',
                'placeholder' => __( 'N/A', 'woocommerce' ),
                'type'        => 'textarea',
                'default'     => $this->get_default_additional_content(),
                'desc_tip'    => true,
            ),
            'email_type'         => array(
                'title'       => __( 'Email type', 'woocommerce' ),
                'type'        => 'select',
                'description' => __( 'Choose which format of email to send.', 'woocommerce' ),
                'default'     => 'html',
                'class'       => 'email_type wc-enhanced-select',
                'options'     => $this->get_email_type_options(),
                'desc_tip'    => true,
            ),
        );
    }

    /**
     * Email type options.
     *
     * @return array
     */
    public function get_email_type_options() {
        $types = array( 'plain' => __( 'Plain text', 'woocommerce' ) );

        if ( class_exists( 'DOMDocument' ) ) {
            $types['html']      = __( 'HTML', 'woocommerce' );
            $types['multipart'] = __( 'Multipart', 'woocommerce' );
        }

        return $types;
    }

    /**
     * Admin Panel Options Processing.
     */
    public function process_admin_options() {
        // Save regular options.
        parent::process_admin_options();

        $post_data = $this->get_post_data();

        // Save templates.
        if ( isset( $post_data['template_html_code'] ) ) {
            $this->save_template( $post_data['template_html_code'], $this->template_html );
        }
        if ( isset( $post_data['template_plain_code'] ) ) {
            $this->save_template( $post_data['template_plain_code'], $this->template_plain );
        }
    }

    /**
     * Get template.
     *
     * @param  string $type Template type. Can be either 'template_html' or 'template_plain'.
     * @return string
     */
    public function get_template( $type ) {
        $type = basename( $type );

        if ( 'template_html' === $type ) {
            return $this->template_html;
        } elseif ( 'template_plain' === $type ) {
            return $this->template_plain;
        }
        return '';
    }

    /**
     * Save the email templates.
     *
     * @since 2.4.0
     * @param string $template_code Template code.
     * @param string $template_path Template path.
     */
    protected function save_template( $template_code, $template_path ) {
        if ( current_user_can( 'edit_themes' ) && ! empty( $template_code ) && ! empty( $template_path ) ) {
            $saved = false;
            $file  = get_stylesheet_directory() . '/' . WC()->template_path() . $template_path;
            $code  = wp_unslash( $template_code );

            if ( is_writeable( $file ) ) { // phpcs:ignore WordPress.VIP.FileSystemWritesDisallow.file_ops_is_writeable
                $f = fopen( $file, 'w+' ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fopen

                if ( false !== $f ) {
                    fwrite( $f, $code ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fwrite
                    fclose( $f ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fclose
                    $saved = true;
                }
            }

            if ( ! $saved ) {
                $redirect = add_query_arg( 'wc_error', rawurlencode( __( 'Could not write to template file.', 'woocommerce' ) ) );
                wp_safe_redirect( $redirect );
                exit;
            }
        }
    }

    /**
     * Get the template file in the current theme.
     *
     * @param  string $template Template name.
     *
     * @return string
     */
    public function get_theme_template_file( $template ) {
        return get_stylesheet_directory() . '/' . apply_filters( 'woocommerce_template_directory', 'woocommerce', $template ) . '/' . $template;
    }

    /**
     * Move template action.
     *
     * @param string $template_type Template type.
     */
    protected function move_template_action( $template_type ) {
        $template = $this->get_template( $template_type );
        if ( ! empty( $template ) ) {
            $theme_file = $this->get_theme_template_file( $template );

            if ( wp_mkdir_p( dirname( $theme_file ) ) && ! file_exists( $theme_file ) ) {

                // Locate template file.
                $core_file     = $this->template_base . $template;
                $template_file = apply_filters( 'woocommerce_locate_core_template', $core_file, $template, $this->template_base, $this->id );

                // Copy template file.
                copy( $template_file, $theme_file );

                /**
                 * Action hook fired after copying email template file.
                 *
                 * @param string $template_type The copied template type
                 * @param string $email The email object
                 */
                do_action( 'woocommerce_copy_email_template', $template_type, $this );

                ?>
                <div class="updated">
                    <p><?php echo esc_html__( 'Template file copied to theme.', 'woocommerce' ); ?></p>
                </div>
                <?php
            }
        }
    }

    /**
     * Delete template action.
     *
     * @param string $template_type Template type.
     */
    protected function delete_template_action( $template_type ) {
        $template = $this->get_template( $template_type );

        if ( $template ) {
            if ( ! empty( $template ) ) {
                $theme_file = $this->get_theme_template_file( $template );

                if ( file_exists( $theme_file ) ) {
                    unlink( $theme_file ); // phpcs:ignore WordPress.VIP.FileSystemWritesDisallow.file_ops_unlink

                    /**
                     * Action hook fired after deleting template file.
                     *
                     * @param string $template The deleted template type
                     * @param string $email The email object
                     */
                    do_action( 'woocommerce_delete_email_template', $template_type, $this );
                    ?>
                    <div class="updated">
                        <p><?php echo esc_html__( 'Template file deleted from theme.', 'woocommerce' ); ?></p>
                    </div>
                    <?php
                }
            }
        }
    }

    /**
     * Admin actions.
     */
    protected function admin_actions() {
        // Handle any actions.
        if (
            ( ! empty( $this->template_html ) || ! empty( $this->template_plain ) )
            && ( ! empty( $_GET['move_template'] ) || ! empty( $_GET['delete_template'] ) )
            && 'GET' === $_SERVER['REQUEST_METHOD'] // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated
        ) {
            if ( empty( $_GET['_wc_email_nonce'] ) || ! wp_verify_nonce( wc_clean( wp_unslash( $_GET['_wc_email_nonce'] ) ), 'woocommerce_email_template_nonce' ) ) {
                wp_die( esc_html__( 'Action failed. Please refresh the page and retry.', 'woocommerce' ) );
            }

            if ( ! current_user_can( 'edit_themes' ) ) {
                wp_die( esc_html__( 'You don&#8217;t have permission to do this.', 'woocommerce' ) );
            }

            if ( ! empty( $_GET['move_template'] ) ) {
                $this->move_template_action( wc_clean( wp_unslash( $_GET['move_template'] ) ) );
            }

            if ( ! empty( $_GET['delete_template'] ) ) {
                $this->delete_template_action( wc_clean( wp_unslash( $_GET['delete_template'] ) ) );
            }
        }
    }

    /**
     * Admin Options.
     *
     * Setup the email settings screen.
     * Override this in your email.
     *
     * @since 1.0.0
     */
    public function admin_options() {
        // Do admin actions.
        $this->admin_actions();
        ?>
        <h2><?php echo esc_html( $this->get_title() ); ?> <?php wc_back_link( __( 'Return to emails', 'woocommerce' ), admin_url( 'admin.php?page=wc-settings&tab=email' ) ); ?></h2>

        <?php echo wpautop( wp_kses_post( $this->get_description() ) ); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>

        <?php
        /**
         * Action hook fired before displaying email settings.
         *
         * @param string $email The email object
         */
        do_action( 'woocommerce_email_settings_before', $this );
        ?>

        <table class="form-table">
            <?php $this->generate_settings_html(); ?>
        </table>

        <?php
        /**
         * Action hook fired after displaying email settings.
         *
         * @param string $email The email object
         */
        do_action( 'woocommerce_email_settings_after', $this );
        ?>

        <?php

        if ( current_user_can( 'edit_themes' ) && ( ! empty( $this->template_html ) || ! empty( $this->template_plain ) ) ) {
            ?>
            <div id="template">
                <?php
                $templates = array(
                    'template_html'  => __( 'HTML template', 'woocommerce' ),
                    'template_plain' => __( 'Plain text template', 'woocommerce' ),
                );

                foreach ( $templates as $template_type => $title ) :
                    $template = $this->get_template( $template_type );

                    if ( empty( $template ) ) {
                        continue;
                    }

                    $local_file    = $this->get_theme_template_file( $template );
                    $core_file     = $this->template_base . $template;
                    $template_file = apply_filters( 'woocommerce_locate_core_template', $core_file, $template, $this->template_base, $this->id );
                    $template_dir  = apply_filters( 'woocommerce_template_directory', 'woocommerce', $template );
                    ?>
                    <div class="template <?php echo esc_attr( $template_type ); ?>">
                        <h4><?php echo wp_kses_post( $title ); ?></h4>

                        <?php if ( file_exists( $local_file ) ) : ?>
                            <p>
                                <a href="#" class="button toggle_editor"></a>

                                <?php if ( is_writable( $local_file ) ) : // phpcs:ignore WordPress.VIP.FileSystemWritesDisallow.file_ops_is_writable ?>
                                    <a href="<?php echo esc_url( wp_nonce_url( remove_query_arg( array( 'move_template', 'saved' ), add_query_arg( 'delete_template', $template_type ) ), 'woocommerce_email_template_nonce', '_wc_email_nonce' ) ); ?>" class="delete_template button">
                                        <?php esc_html_e( 'Delete template file', 'woocommerce' ); ?>
                                    </a>
                                <?php endif; ?>

                                <?php
                                /* translators: %s: Path to template file */
                                printf( esc_html__( 'This template has been overridden by your theme and can be found in: %s.', 'woocommerce' ), '<code>' . esc_html( trailingslashit( basename( get_stylesheet_directory() ) ) . $template_dir . '/' . $template ) . '</code>' );
                                ?>
                            </p>

                            <div class="editor" style="display:none">
                                <textarea class="code" cols="25" rows="20"
                                <?php
                                if ( ! is_writable( $local_file ) ) : // phpcs:ignore WordPress.VIP.FileSystemWritesDisallow.file_ops_is_writable
                                    ?>
                                    readonly="readonly" disabled="disabled"
                                <?php else : ?>
                                    data-name="<?php echo esc_attr( $template_type ) . '_code'; ?>"<?php endif; ?>><?php echo esc_html( file_get_contents( $local_file ) ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents ?></textarea>
                            </div>
                        <?php elseif ( file_exists( $template_file ) ) : ?>
                            <p>
                                <a href="#" class="button toggle_editor"></a>

                                <?php
                                $emails_dir    = get_stylesheet_directory() . '/' . $template_dir . '/emails';
                                $templates_dir = get_stylesheet_directory() . '/' . $template_dir;
                                $theme_dir     = get_stylesheet_directory();

                                if ( is_dir( $emails_dir ) ) {
                                    $target_dir = $emails_dir;
                                } elseif ( is_dir( $templates_dir ) ) {
                                    $target_dir = $templates_dir;
                                } else {
                                    $target_dir = $theme_dir;
                                }

                                if ( is_writable( $target_dir ) ) : // phpcs:ignore WordPress.VIP.FileSystemWritesDisallow.file_ops_is_writable
                                    ?>
                                    <a href="<?php echo esc_url( wp_nonce_url( remove_query_arg( array( 'delete_template', 'saved' ), add_query_arg( 'move_template', $template_type ) ), 'woocommerce_email_template_nonce', '_wc_email_nonce' ) ); ?>" class="button">
                                        <?php esc_html_e( 'Copy file to theme', 'woocommerce' ); ?>
                                    </a>
                                <?php endif; ?>

                                <?php
                                /* translators: 1: Path to template file 2: Path to theme folder */
                                printf( esc_html__( 'To override and edit this email template copy %1$s to your theme folder: %2$s.', 'woocommerce' ), '<code>' . esc_html( plugin_basename( $template_file ) ) . '</code>', '<code>' . esc_html( trailingslashit( basename( get_stylesheet_directory() ) ) . $template_dir . '/' . $template ) . '</code>' );
                                ?>
                            </p>

                            <div class="editor" style="display:none">
                                <textarea class="code" readonly="readonly" disabled="disabled" cols="25" rows="20"><?php echo esc_html( file_get_contents( $template_file ) );  // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents ?></textarea>
                            </div>
                        <?php else : ?>
                            <p><?php esc_html_e( 'File was not found.', 'woocommerce' ); ?></p>
                        <?php endif; ?>
                    </div>
                <?php endforeach; ?>
            </div>

            <?php
            wc_enqueue_js(
                "jQuery( 'select.email_type' ).change( function() {

                    var val = jQuery( this ).val();

                    jQuery( '.template_plain, .template_html' ).show();

                    if ( val != 'multipart' && val != 'html' ) {
                        jQuery('.template_html').hide();
                    }

                    if ( val != 'multipart' && val != 'plain' ) {
                        jQuery('.template_plain').hide();
                    }

                }).change();

                var view = '" . esc_js( __( 'View template', 'woocommerce' ) ) . "';
                var hide = '" . esc_js( __( 'Hide template', 'woocommerce' ) ) . "';

                jQuery( 'a.toggle_editor' ).text( view ).on( 'click', function() {
                    var label = hide;

                    if ( jQuery( this ).closest(' .template' ).find( '.editor' ).is(':visible') ) {
                        var label = view;
                    }

                    jQuery( this ).text( label ).closest(' .template' ).find( '.editor' ).slideToggle();
                    return false;
                } );

                jQuery( 'a.delete_template' ).on( 'click', function() {
                    if ( window.confirm('" . esc_js( __( 'Are you sure you want to delete this template file?', 'woocommerce' ) ) . "') ) {
                        return true;
                    }

                    return false;
                });

                jQuery( '.editor textarea' ).change( function() {
                    var name = jQuery( this ).attr( 'data-name' );

                    if ( name ) {
                        jQuery( this ).attr( 'name', name );
                    }
                });"
            );
        }
    }
}