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File Content: `class-comment-form.php`

<?php

defined('ABSPATH') or exit;

/**
 * Class MC4WP_Comment_Form_Integration
 *
 * @ignore
 */
class MC4WP_Comment_Form_Integration extends MC4WP_Integration
{
    /**
     * @var bool
     */
    protected $added_through_filter = false;

    /**
     * @var string
     */
    public $name = 'Comment Form';

    /**
     * @var string
     */
    public $description = 'Subscribes people from your WordPress comment form.';

    /**
     * Add hooks
     */
    public function add_hooks()
    {
        if (! $this->options['implicit']) {
            // hooks for outputting the checkbox
            add_filter('comment_form_submit_field', [ $this, 'add_checkbox_before_submit_button' ], 90);

            add_action('thesis_hook_after_comment_box', [ $this, 'maybe_output_checkbox' ], 90);
            add_action('comment_form', [ $this, 'maybe_output_checkbox' ], 90);
        }

        // hooks for checking if we should subscribe the commenter
        add_action('comment_post', [ $this, 'subscribe_from_comment' ], 40, 2);
    }

    /**
     * This adds the checkbox just before the submit button and sets a flag to prevent it from outputting twice
     *
     * @param $submit_button_html
     *
     * @return string
     */
    public function add_checkbox_before_submit_button($submit_button_html)
    {
        $this->added_through_filter = true;
        return $this->get_checkbox_html() . $submit_button_html;
    }

    /**
     * Output fallback
     * Will output the checkbox if comment_form() function does not use `comment_form_submit_field` filter yet.
     */
    public function maybe_output_checkbox()
    {
        if (! $this->added_through_filter) {
            $this->output_checkbox();
        }
    }

    /**
     * Grabs data from WP Comment Form
     *
     * @param int    $comment_id
     * @param string $comment_approved
     *
     * @return bool|string
     */
    public function subscribe_from_comment($comment_id, $comment_approved = '')
    {

        // was sign-up checkbox checked?
        if (! $this->triggered()) {
            return false;
        }

        // is this a spam comment?
        if ($comment_approved === 'spam') {
            return false;
        }

        $comment = get_comment($comment_id);

        $data = [
            'EMAIL'    => $comment->comment_author_email,
            'NAME'     => $comment->comment_author,
            'OPTIN_IP' => $comment->comment_author_IP,
        ];

        return $this->subscribe($data, $comment_id);
    }

    /**
     * @return bool
     */
    public function is_installed()
    {
        return true;
    }

    /**
     * {@inheritdoc }
     */
    public function get_object_link($object_id)
    {
        $comment = get_comment($object_id);

        if (! $comment) {
            return '';
        }

        return sprintf('<a href="%s">Comment #%d</a>', get_edit_comment_link($object_id), $object_id);
    }
}
File Content: class-comment-form.php

File Content: `class-comment-form.php`
