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Editing: Preview.php

<?php

namespace WPForms\Forms;

/**
 * Form preview.
 *
 * @since 1.5.1
 */
class Preview {

/**
	 * Form data.
	 *
	 * @since 1.5.1
	 *
	 * @var array
	 */
	public $form_data;

/**
	 * Constructor.
	 *
	 * @since 1.5.1
	 */
	public function __construct() {

if ( ! $this->is_preview_page() ) {
			return;
		}

$this->hooks();
	}

/**
	 * Check if current page request meets requirements for form preview page.
	 *
	 * @since 1.5.1
	 *
	 * @return bool
	 */
	public function is_preview_page() {

// Only proceed for the form preview page.
		if ( empty( $_GET['wpforms_form_preview'] ) ) { // phpcs:ignore
			return false;
		}

// Check for logged in user with correct capabilities.
		if ( ! \is_user_logged_in() ) {
			return false;
		}

$form_id = \absint( $_GET['wpforms_form_preview'] ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended

if ( ! \wpforms_current_user_can( 'view_form_single', $form_id ) ) {
			return false;
		}

// Fetch form details for the entry.
		$this->form_data = \wpforms()->form->get(
			$form_id,
			array(
				'content_only' => true,
			)
		);

// Check valid form was found.
		if ( empty( $this->form_data ) ) {
			return false;
		}

return true;
	}

/**
	 * Hooks.
	 *
	 * @since 1.5.1
	 */
	public function hooks() {

\add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) );

\add_filter( 'the_title', array( $this, 'the_title' ), 100, 1 );

\add_filter( 'the_content', array( $this, 'the_content' ), 999 );

\add_filter( 'get_the_excerpt', array( $this, 'the_content' ), 999 );

\add_filter( 'template_include', array( $this, 'template_include' ) );

\add_filter( 'post_thumbnail_html', '__return_empty_string' );
	}

/**
	 * Modify query, limit to one post.
	 *
	 * @since 1.5.1
	 *
	 * @param \WP_Query $query The WP_Query instance.
	 */
	public function pre_get_posts( $query ) {

if ( ! is_admin() && $query->is_main_query() ) {
			$query->set( 'posts_per_page', 1 );
		}
	}

/**
	 * Customize form preview page title.
	 *
	 * @since 1.5.1
	 *
	 * @param string $title Page title.
	 *
	 * @return string
	 */
	public function the_title( $title ) {

if ( in_the_loop() ) {
			$title = sprintf( /* translators: %s - form title. */
				esc_html__( '%s Preview', 'wpforms-lite' ),
				! empty( $this->form_data['settings']['form_title'] ) ? sanitize_text_field( $this->form_data['settings']['form_title'] ) : esc_html__( 'Form', 'wpforms-lite' )
			);
		}

return $title;
	}

/**
	 * Customize form preview page content.
	 *
	 * @since 1.5.1
	 *
	 * @return string
	 */
	public function the_content() {

if ( ! isset( $this->form_data['id'] ) ) {
			return '';
		}

if ( ! wpforms_current_user_can( 'view_form_single', $this->form_data['id'] ) ) {
			return '';
		}

$links = [];

if ( wpforms_current_user_can( 'edit_form_single', $this->form_data['id'] ) ) {
			$links[] = [
				'url'  => esc_url(
					add_query_arg(
						[
							'page'    => 'wpforms-builder',
							'view'    => 'fields',
							'form_id' => absint( $this->form_data['id'] ),
						],
				 		admin_url( 'admin.php' )
					)
				),
				'text' => esc_html__( 'Edit Form', 'wpforms-lite' ),
			];
		}

if ( wpforms()->pro && wpforms_current_user_can( 'view_entries_form_single', $this->form_data['id'] ) ) {
			$links[] = [
				'url'  => esc_url(
					add_query_arg(
						[
							'page'    => 'wpforms-entries',
							'view'    => 'list',
							'form_id' => absint( $this->form_data['id'] ),
						],
						admin_url( 'admin.php' )
					)
				),
				'text' => esc_html__( 'View Entries', 'wpforms-lite' ),
			];
		}

if ( ! empty( $_GET['new_window'] ) ) { // phpcs:ignore
			$links[] = [
				'url'  => 'javascript:window.close();',
				'text' => esc_html__( 'Close this window', 'wpforms-lite' ),
			];
		}

$content = '';
		$content .= esc_html__( 'This is a preview of your form. This page is not publicly accessible.', 'wpforms-lite' );
		if ( ! empty( $links ) ) {
			$content .= ' ';
			foreach ( $links as $key => $link ) {
				$content .= '<a href="' . $link['url'] . '">' . $link['text'] . '</a>';
				$l = array_keys( $links );
				if ( end( $l ) !== $key ) {
					$content .= ' | ';
				}
			}
		}
		$content .= '';

$content .= '';
		$content .= sprintf(
			wp_kses(
				/* translators: %s - WPForms doc link. */
				__( 'For form testing tips, check out our <a href="%s" target="_blank" rel="noopener noreferrer">complete guide!</a>', 'wpforms-lite' ),
				[
					'a' => [
						'href' => [],
						'target' => [],
						'rel' => [],
					],
				]
			),
			'https://wpforms.com/docs/how-to-properly-test-your-wordpress-forms-before-launching-checklist/'
		);
		$content .= '';

$content .= do_shortcode( '[wpforms id="' . absint( $this->form_data['id'] ) . '"]' );

return $content;
	}

/**
	 * Force page template types.
	 *
	 * @since 1.5.1
	 *
	 * @return string
	 */
	public function template_include() {

return locate_template( array( 'page.php', 'single.php', 'index.php' ) );
	}
}

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