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<?php
namespace WPForms\Admin;
use WP_Post;
/**
* Form Revisions.
*
* @since 1.7.3
*/
class Revisions {
/**
* Current Form Builder panel view.
*
* @since 1.7.3
*
* @var string
*/
private $view = 'revisions';
/**
* Current Form ID.
*
* @since 1.7.3
*
* @var int|false
*/
private $form_id = false;
/**
* Current Form.
*
* @since 1.7.3
*
* @var WP_Post|null
*/
private $form;
/**
* Current Form Revision ID.
*
* @since 1.7.3
*
* @var int|false
*/
private $revision_id = false;
/**
* Current Form Revision.
*
* @since 1.7.3
*
* @var WP_Post|null
*/
private $revision;
/**
* Whether revisions panel was already viewed by the user at least once.
*
* @since 1.7.3
*
* @var bool
*/
private $viewed;
/**
* Initialize the class if preconditions are met.
*
* @since 1.7.3
*
* @return void
*/
public function init() {
if ( ! $this->allow_load() ) {
return;
}
// phpcs:disable WordPress.Security.NonceVerification.Recommended
if ( isset( $_REQUEST['view'] ) ) {
$this->view = sanitize_key( $_REQUEST['view'] );
}
if ( isset( $_REQUEST['revision_id'] ) ) {
$this->revision_id = absint( $_REQUEST['revision_id'] );
}
// phpcs:enable WordPress.Security.NonceVerification.Recommended
// Fetch revision, if needed.
if ( $this->revision_id && wp_revisions_enabled( $this->form ) ) {
$this->revision = wp_get_post_revision( $this->revision_id );
}
// Bail if we don't have a valid revision.
if ( $this->revision_id && ! $this->revision instanceof WP_Post ) {
return;
}
$this->hooks();
}
/**
* Whether it is allowed to load under certain conditions.
*
* - numeric, non-zero form ID provided,
* - the form with this ID exists and was successfully fetched,
* - we're in the Form Builder or processing an ajax request.
*
* @since 1.7.3
*
* @return bool
*/
private function allow_load() {
if ( ! ( wpforms_is_admin_page( 'builder' ) || wp_doing_ajax() ) ) {
return false;
}
// phpcs:disable WordPress.Security.NonceVerification.Recommended
$id = wp_doing_ajax() && isset( $_REQUEST['id'] ) ? absint( $_REQUEST['id'] ) : false;
$id = isset( $_REQUEST['form_id'] ) && ! is_array( $_REQUEST['form_id'] ) ? absint( $_REQUEST['form_id'] ) : $id;
// phpcs:enable WordPress.Security.NonceVerification.Recommended
$this->form_id = $id;
$form_handler = wpforms()->obj( 'form' );
if ( ! $form_handler ) {
return false;
}
$this->form = $form_handler->get( $this->form_id );
return $this->form_id && $this->form instanceof WP_Post;
}
/**
* Hook into WordPress lifecycle.
*
* @since 1.7.3
*/
private function hooks() {
// Restore a revision. The `admin_init` action has already fired, `current_screen` fires before headers are sent.
add_action( 'current_screen', [ $this, 'process_restore' ] );
// Refresh a rendered list of revisions on the frontend.
add_action( 'wp_ajax_wpforms_get_form_revisions', [ $this, 'fetch_revisions_list' ] );
// Mark Revisions panel as viewed when viewed for the first time. Hides the error badge.
add_action( 'wp_ajax_wpforms_mark_panel_viewed', [ $this, 'mark_panel_viewed' ] );
// Back-compat for forms created with revisions disabled.
add_action( 'wpforms_builder_init', [ $this, 'maybe_create_initial_revision' ] );
// Pass localized strings to frontend.
add_filter( 'wpforms_builder_strings', [ $this, 'get_localized_strings' ], 10, 2 );
}
/**
* Get current revision, if available.
*
* @since 1.7.3
*
* @return WP_Post|null
*/
public function get_revision() {
return $this->revision;
}
/**
* Get formatted date or time.
*
* @since 1.7.3
*
* @param string $datetime UTC datetime from the post object.
* @param string $part What to return - date or time, defaults to date.
*
* @return string
*/
public function get_formatted_datetime( $datetime, $part = 'date' ) {
if ( $part === 'time' ) {
return wpforms_time_format( $datetime, '', true );
}
// M j format needs to keep one-line date.
return wpforms_date_format( $datetime, 'M j', true );
}
/**
* Get admin (Form Builder) base URL with additional query args.
*
* @since 1.7.3
*
* @param array $query_args Additional query args to append to the base URL.
*
* @return string
*/
public function get_url( $query_args = [] ) {
$defaults = [
'page' => 'wpforms-builder',
'view' => $this->view,
'form_id' => $this->form_id,
];
return add_query_arg(
wp_parse_args( $query_args, $defaults ),
admin_url( 'admin.php' )
);
}
/**
* Determine if Revisions panel was previously viewed by current user.
*
* @since 1.7.3
*
* @return bool
*/
public function panel_viewed() {
if ( $this->viewed === null ) {
$this->viewed = (bool) get_user_meta( get_current_user_id(), 'wpforms_revisions_disabled_notice_dismissed', true );
}
return $this->viewed;
}
/**
* Mark Revisions panel as viewed by current user.
*
* @since 1.7.3
*/
public function mark_panel_viewed() {
// Run a security check.
check_ajax_referer( 'wpforms-builder', 'nonce' );
if ( ! $this->panel_viewed() ) {
$this->viewed = update_user_meta( get_current_user_id(), 'wpforms_revisions_disabled_notice_dismissed', true );
}
wp_send_json_success( [ 'updated' => $this->viewed ] );
}
/**
* Get a rendered list of all revisions.
*
* @since 1.7.3
*
* @return string
*/
public function render_revisions_list() {
return wpforms_render(
'builder/revisions/list',
$this->prepare_template_render_arguments(),
true
);
}
/**
* Prepare all arguments for the template to be rendered.
*
* Note: All data is escaped in the template.
*
* @since 1.7.3
*
* @return array
*/
private function prepare_template_render_arguments() {
$args = [
'active_class' => $this->revision ? '' : ' active',
'current_version_url' => $this->get_url(),
'author_id' => $this->form->post_author,
'revisions' => [],
'show_avatars' => get_option( 'show_avatars' ),
];
$revisions = wp_get_post_revisions( $this->form_id );
if ( empty( $revisions ) ) {
return $args;
}
// WordPress always orders entries by `post_date` column, which contains a date and time in site's timezone configured in settings.
// This setting is per site, not per user, and it's not expected to be changed. However, if it was changed for whatever reason,
// the order of revisions will be incorrect. This is definitely an edge case, but we can prevent this from ever happening
// by sorting the results using `post_date_gmt` or `post_modified_gmt`, which contains UTC date and never changes.
uasort(
$revisions,
static function ( $a, $b ) {
return strtotime( $a->post_modified_gmt ) > strtotime( $b->post_modified_gmt ) ? -1 : 1;
}
);
// The first revision is always identical to the current version and should not be displayed in the list.
$current_revision = array_shift( $revisions );
// Display the author of current version instead of a form author.
$args['author_id'] = $current_revision->post_author;
foreach ( $revisions as $revision ) {
$time_diff = sprintf( /* translators: %s - relative time difference, e.g. "5 minutes", "12 days". */
__( '%s ago', 'wpforms-lite' ),
human_time_diff( strtotime( $revision->post_modified_gmt . ' +0000' ) )
);
$date_time = sprintf( /* translators: %1$s - date, %2$s - time when item was created, e.g. "Oct 22 at 11:11am". */
__( '%1$s at %2$s', 'wpforms-lite' ),
$this->get_formatted_datetime( $revision->post_modified_gmt ),
$this->get_formatted_datetime( $revision->post_modified_gmt, 'time' )
);
$args['revisions'][] = [
'active_class' => $this->revision && $this->revision->ID === $revision->ID ? ' active' : '',
'url' => $this->get_url(
[
'revision_id' => $revision->ID,
]
),
'author_id' => $revision->post_author,
'time_diff' => $time_diff,
'date_time' => $date_time,
];
}
return $args;
}
/**
* Fetch a list of revisions via ajax.
*
* @since 1.7.3
*/
public function fetch_revisions_list() {
// Run a security check.
check_ajax_referer( 'wpforms-builder', 'nonce' );
wp_send_json_success(
[
'html' => $this->render_revisions_list(),
]
);
}
/**
* Restore the revision (if needed) and reload the Form Builder.
*
* @since 1.7.3
*
* @return void
*/
public function process_restore() {
$is_restore_request = isset( $_GET['action'] ) && $_GET['action'] === 'restore_revision';
// Bail early.
if (
! $is_restore_request ||
! $this->form_id ||
! $this->form ||
! $this->revision_id ||
! $this->revision ||
! check_admin_referer( 'restore_revision', 'wpforms_nonce' )
) {
return;
}
$restored_id = wp_restore_post_revision( $this->revision );
if ( $restored_id ) {
wp_safe_redirect(
wpforms()->obj( 'revisions' )->get_url(
[
'form_id' => $restored_id,
]
)
);
exit;
}
}
/**
* Create initial revision for existing form.
*
* When a new form is created with revisions enabled, WordPress immediately creates first revision which is identical to the form. But when
* a form was created with revisions disabled, this initial revision does not exist. Revisions are saved after post update, so modifying
* a form that have no initial revision will update the post first, then a revision of this updated post will be saved. The version of
* the form that existed before this update is now gone. To avoid losing this pre-revisions state, we create this initial revision
* when the Form Builder loads, if needed.
*
* @since 1.7.3
*
* @return void
*/
public function maybe_create_initial_revision() {
// On new form creation there's no revisions yet, bail. Also, when revisions are disabled.
// phpcs:ignore WordPress.Security.NonceVerification.Recommended
if ( isset( $_GET['newform'] ) || ! wp_revisions_enabled( $this->form ) ) {
return;
}
$revisions = wp_get_post_revisions(
$this->form_id,
[
'fields' => 'ids',
'numberposts' => 1,
]
);
if ( $revisions ) {
return;
}
$initial_revision_id = wp_save_post_revision( $this->form_id );
$initial_revision = wp_get_post_revision( $initial_revision_id );
// Initial revision should belong to the author of the original form.
if ( $initial_revision->post_author !== $this->form->post_author ) {
wp_update_post(
[
'ID' => $initial_revision_id,
'post_author' => $this->form->post_author,
]
);
}
}
/**
* Pass localized strings to frontend.
*
* @since 1.7.3
*
* @param array $strings All strings that will be passed to frontend.
* @param WP_Post $form Current form object.
*
* @return array
*/
public function get_localized_strings( $strings, $form ) {
$strings['revision_update_confirm'] = esc_html__( 'You’re about to save a form revision. Continuing will make this the current version.', 'wpforms-lite' );
return $strings;
}
}