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EDIT :: revisions-manager.php

<?php
namespace Elementor\Modules\History;

use Elementor\Core\Base\Document;
use Elementor\Core\Common\Modules\Ajax\Module as Ajax;
use Elementor\Core\Files\CSS\Post as Post_CSS;
use Elementor\Plugin;
use Elementor\Utils;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

/**
 * Elementor history revisions manager.
 *
 * Elementor history revisions manager handler class is responsible for
 * registering and managing Elementor revisions manager.
 *
 * @since 1.7.0
 */
class Revisions_Manager {

/**
	 * Maximum number of revisions to display.
	 */
	const MAX_REVISIONS_TO_DISPLAY = 50;

/**
	 * Authors list.
	 *
	 * Holds all the authors.
	 *
	 * @access private
	 *
	 * @var array
	 */
	private static $authors = [];

/**
	 * History revisions manager constructor.
	 *
	 * Initializing Elementor history revisions manager.
	 *
	 * @since 1.7.0
	 * @access public
	 */
	public function __construct() {
		self::register_actions();
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 */
	public static function handle_revision() {
		add_filter( 'wp_save_post_revision_check_for_changes', '__return_false' );
	}

/**
	 * @since 2.0.0
	 * @access public
	 * @static
	 *
	 * @param $post_content
	 * @param $post_id
	 *
	 * @return string
	 */
	public static function avoid_delete_auto_save( $post_content, $post_id ) {
		// Add a temporary string in order the $post will not be equal to the $autosave
		// in edit-form-advanced.php:210
		$document = Plugin::$instance->documents->get( $post_id );

if ( $document && $document->is_built_with_elementor() ) {
			$post_content .= '';
		}

return $post_content;
	}

/**
	 * @since 2.0.0
	 * @access public
	 * @static
	 */
	public static function remove_temp_post_content() {
		global $post;

$document = Plugin::$instance->documents->get( $post->ID );

if ( ! $document || ! $document->is_built_with_elementor() ) {
			return;
		}

$post->post_content = str_replace( '', '', $post->post_content );
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 *
	 * @param int   $post_id
	 * @param array $query_args
	 * @param bool  $parse_result
	 *
	 * @return array
	 */
	public static function get_revisions( $post_id = 0, $query_args = [], $parse_result = true ) {
		$post = get_post( $post_id );

if ( ! $post || empty( $post->ID ) ) {
			return [];
		}

$revisions = [];

$default_query_args = [
			'posts_per_page' => self::MAX_REVISIONS_TO_DISPLAY,
			'meta_key' => '_elementor_data',
		];

$query_args = array_merge( $default_query_args, $query_args );

$posts = wp_get_post_revisions( $post->ID, $query_args );

if ( ! wp_revisions_enabled( $post ) ) {
			$autosave = Utils::get_post_autosave( $post->ID );
			if ( $autosave ) {
				if ( $parse_result ) {
					array_unshift( $posts, $autosave );
				} else {
					array_unshift( $posts, $autosave->ID );
				}
			}
		}

if ( $parse_result ) {
			array_unshift( $posts, $post );
		} else {
			array_unshift( $posts, $post->ID );
			return $posts;
		}

$current_time = current_time( 'timestamp' );

/** @var \WP_Post $revision */
		foreach ( $posts as $revision ) {
			$date = date_i18n( _x( 'M j @ H:i', 'revision date format', 'elementor' ), strtotime( $revision->post_modified ) );

$human_time = human_time_diff( strtotime( $revision->post_modified ), $current_time );

if ( $revision->ID === $post->ID ) {
				$type = 'current';
				$type_label = esc_html__( 'Current Version', 'elementor' );
			} elseif ( false !== strpos( $revision->post_name, 'autosave' ) ) {
				$type = 'autosave';
				$type_label = esc_html__( 'Autosave', 'elementor' );
			} else {
				$type = 'revision';
				$type_label = esc_html__( 'Revision', 'elementor' );
			}

if ( ! isset( self::$authors[ $revision->post_author ] ) ) {
				self::$authors[ $revision->post_author ] = [
					'avatar' => get_avatar( $revision->post_author, 22 ),
					'display_name' => get_the_author_meta( 'display_name', $revision->post_author ),
				];
			}

$revisions[] = [
				'id' => $revision->ID,
				'author' => self::$authors[ $revision->post_author ]['display_name'],
				'timestamp' => strtotime( $revision->post_modified ),
				'date' => sprintf(
					/* translators: 1: Human readable time difference, 2: Date. */
					esc_html__( '%1$s ago (%2$s)', 'elementor' ),
					'<time>' . $human_time . '</time>',
					'<time>' . $date . '</time>'
				),
				'type' => $type,
				'typeLabel' => $type_label,
				'gravatar' => self::$authors[ $revision->post_author ]['avatar'],
			];
		}

return $revisions;
	}

/**
	 * @since 1.9.2
	 * @access public
	 * @static
	 */
	public static function update_autosave( $autosave_data ) {
		self::save_revision( $autosave_data['ID'] );
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 */
	public static function save_revision( $revision_id ) {
		$parent_id = wp_is_post_revision( $revision_id );

if ( $parent_id ) {
			Plugin::$instance->db->safe_copy_elementor_meta( $parent_id, $revision_id );
		}
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 */
	public static function restore_revision( $parent_id, $revision_id ) {
		$parent = Plugin::$instance->documents->get( $parent_id );
		$revision = Plugin::$instance->documents->get( $revision_id );

if ( ! $parent || ! $revision ) {
			return;
		}

$is_built_with_elementor = $revision->is_built_with_elementor();

$parent->set_is_built_with_elementor( $is_built_with_elementor );

if ( ! $is_built_with_elementor ) {
			return;
		}

Plugin::$instance->db->copy_elementor_meta( $revision_id, $parent_id );

$post_css = Post_CSS::create( $parent_id );

$post_css->update();
	}

/**
	 * @since 2.3.0
	 * @access public
	 * @static
	 *
	 * @param $data
	 *
	 * @return array
	 * @throws \Exception
	 */
	public static function ajax_get_revision_data( array $data ) {
		if ( ! isset( $data['id'] ) ) {
			throw new \Exception( 'You must set the revision ID.' );
		}

$revision = Plugin::$instance->documents->get_with_permissions( $data['id'] );

return [
			'settings' => $revision->get_settings(),
			'elements' => $revision->get_elements_data(),
		];
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 */
	public static function add_revision_support_for_all_post_types() {
		$post_types = get_post_types_by_support( 'elementor' );
		foreach ( $post_types as $post_type ) {
			add_post_type_support( $post_type, 'revisions' );
		}
	}

/**
	 * @since 2.0.0
	 * @access public
	 * @static
	 * @param array $return_data
	 * @param Document $document
	 *
	 * @return array
	 */
	public static function on_ajax_save_builder_data( $return_data, $document ) {
		$post_id = $document->get_main_id();

$latest_revisions = self::get_revisions(
			$post_id, [
				'posts_per_page' => 1,
			]
		);

$all_revision_ids = self::get_revisions(
			$post_id, [
				'fields' => 'ids',
			], false
		);

// Send revisions data only if has revisions.
		if ( ! empty( $latest_revisions ) ) {
			$current_revision_id = self::current_revision_id( $post_id );

$return_data = array_replace_recursive( $return_data, [
				'config' => [
					'document' => [
						'revisions' => [
							'current_id' => $current_revision_id,
						],
					],
				],
				'latest_revisions' => $latest_revisions,
				'revisions_ids' => $all_revision_ids,
			] );
		}

return $return_data;
	}

/**
	 * @since 1.7.0
	 * @access public
	 * @static
	 */
	public static function db_before_save( $status, $has_changes ) {
		if ( $has_changes ) {
			self::handle_revision();
		}
	}

public static function document_config( $settings, $post_id ) {
		$settings['revisions'] = [
			'enabled' => ( $post_id && wp_revisions_enabled( get_post( $post_id ) ) ),
			'current_id' => self::current_revision_id( $post_id ),
		];

return $settings;
	}

/**
	 * Localize settings.
	 *
	 * Add new localized settings for the revisions manager.
	 *
	 * Fired by `elementor/editor/editor_settings` filter.
	 *
	 * @since 1.7.0
	 * @deprecated 3.1.0
	 * @access public
	 * @static
	 */
	public static function editor_settings() {
		Plugin::$instance->modules_manager->get_modules( 'dev-tools' )->deprecation->deprecated_function( __METHOD__, '3.1.0' );

return [];
	}

/**
	 * @throws \Exception
	 */
	public static function ajax_get_revisions( $data ) {
		Plugin::$instance->documents->check_permissions( $data['editor_post_id'] );

return self::get_revisions();
	}

/**
	 * @since 2.3.0
	 * @access public
	 * @static
	 */
	public static function register_ajax_actions( Ajax $ajax ) {
		$ajax->register_ajax_action( 'get_revisions', [ __CLASS__, 'ajax_get_revisions' ] );
		$ajax->register_ajax_action( 'get_revision_data', [ __CLASS__, 'ajax_get_revision_data' ] );
	}

/**
	 * @since 1.7.0
	 * @access private
	 * @static
	 */
	private static function register_actions() {
		add_action( 'wp_restore_post_revision', [ __CLASS__, 'restore_revision' ], 10, 2 );
		add_action( 'init', [ __CLASS__, 'add_revision_support_for_all_post_types' ], 9999 );
		add_filter( 'elementor/document/config', [ __CLASS__, 'document_config' ], 10, 2 );
		add_action( 'elementor/db/before_save', [ __CLASS__, 'db_before_save' ], 10, 2 );
		add_action( '_wp_put_post_revision', [ __CLASS__, 'save_revision' ] );
		add_action( 'wp_creating_autosave', [ __CLASS__, 'update_autosave' ] );
		add_action( 'elementor/ajax/register_actions', [ __CLASS__, 'register_ajax_actions' ] );

// Hack to avoid delete the auto-save revision in WP editor.
		add_filter( 'edit_post_content', [ __CLASS__, 'avoid_delete_auto_save' ], 10, 2 );
		add_action( 'edit_form_after_title', [ __CLASS__, 'remove_temp_post_content' ] );

if ( wp_doing_ajax() ) {
			add_filter( 'elementor/documents/ajax_save/return_data', [ __CLASS__, 'on_ajax_save_builder_data' ], 10, 2 );
		}
	}

/**
	 * @since 1.9.0
	 * @access private
	 * @static
	 */
	private static function current_revision_id( $post_id ) {
		$current_revision_id = $post_id;
		$autosave = Utils::get_post_autosave( $post_id );

if ( is_object( $autosave ) ) {
			$current_revision_id = $autosave->ID;
		}

return $current_revision_id;
	}
}

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EDIT :: revisions-manager.php