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Edit File: Base.php

<?php

namespace WPForms\Admin\Tools\Importers;

/**
 * Base Importer class.
 *
 * @since 1.6.6
 */
abstract class Base implements ImporterInterface {

/**
	 * Importer name.
	 *
	 * @since 1.6.6
	 *
	 * @var string
	 */
	public $name;

/**
	 * Importer name in slug format.
	 *
	 * @since 1.6.6
	 *
	 * @var string
	 */
	public $slug;

/**
	 * Importer plugin path.
	 *
	 * @since 1.6.6
	 *
	 * @var string
	 */
	public $path;

/**
	 * Primary class constructor.
	 *
	 * @since 1.6.6
	 */
	public function __construct() {

$this->init();

// Import a specific form with AJAX.
		add_action( "wp_ajax_wpforms_import_form_{$this->slug}", [ $this, 'import_form' ] );
	}

/**
	 * Add to list of registered importers.
	 *
	 * @since 1.6.6
	 *
	 * @param array $importers List of supported importers.
	 *
	 * @return array
	 */
	public function register( $importers = [] ) {

$importers[ $this->slug ] = [
			'name'      => $this->name,
			'slug'      => $this->slug,
			'path'      => $this->path,
			'installed' => file_exists( trailingslashit( WP_PLUGIN_DIR ) . $this->path ),
			'active'    => $this->is_active(),
		];

return $importers;
	}

/**
	 * If the importer source is available.
	 *
	 * @since 1.6.6
	 *
	 * @return bool
	 */
	protected function is_active() {

return is_plugin_active( $this->path );
	}

/**
	 * Add the new form to the database and return AJAX data.
	 *
	 * @since 1.6.6
	 *
	 * @param array $form          Form to import.
	 * @param array $unsupported   List of unsupported fields.
	 * @param array $upgrade_plain List of fields, that are supported inside the paid WPForms, but not in Lite.
	 * @param array $upgrade_omit  No field alternative in WPForms.
	 */
	public function add_form( $form, $unsupported = [], $upgrade_plain = [], $upgrade_omit = [] ) {

// Create empty form so we have an ID to work with.
		$form_id = wp_insert_post(
			[
				'post_status' => 'publish',
				'post_type'   => 'wpforms',
			]
		);

if ( empty( $form_id ) || is_wp_error( $form_id ) ) {
			wp_send_json_success(
				[
					'error' => true,
					'name'  => sanitize_text_field( $form['settings']['form_title'] ),
					'msg'   => esc_html__( 'There was an error while creating a new form.', 'wpforms-lite' ),
				]
			);
		}

$form['id']       = $form_id;
		$form['field_id'] = count( $form['fields'] ) + 1;

// Update the form with all our compiled data.
		wpforms()->obj( 'form' )->update( $form_id, $form );

// Make note that this form has been imported.
		$this->track_import( $form['settings']['import_form_id'], $form_id );

// Build and send final AJAX response!
		wp_send_json_success(
			[
				'name'          => $form['settings']['form_title'],
				'edit'          => esc_url_raw( admin_url( 'admin.php?page=wpforms-builder&view=fields&form_id=' . $form_id ) ),
				'preview'       => wpforms_get_form_preview_url( $form_id ),
				'unsupported'   => $unsupported,
				'upgrade_plain' => $upgrade_plain,
				'upgrade_omit'  => $upgrade_omit,
			]
		);
	}

/**
	 * After a form has been successfully imported we track it, so that in the
	 * future we can alert users if they try to import a form that has already
	 * been imported.
	 *
	 * @since 1.6.6
	 *
	 * @param int $source_id  Imported plugin form ID.
	 * @param int $wpforms_id WPForms form ID.
	 */
	public function track_import( $source_id, $wpforms_id ) {

$imported = get_option( 'wpforms_imported', [] );

$imported[ $this->slug ][ $wpforms_id ] = $source_id;

update_option( 'wpforms_imported', $imported, false );
	}
}

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