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<?php
/**
* Abstract class to manage the copy and synchronization of metas
*
* @since 2.3
*/
abstract class PLL_Sync_Metas {
public $model;
protected $meta_type, $prev_value, $to_copy;
/**
* Constructor
*
* @since 2.3
*
* @param object $polylang
*/
public function __construct( &$polylang ) {
$this->model = &$polylang->model;
$this->add_all_meta_actions();
add_action( "pll_save_{$this->meta_type}", array( $this, 'save_object' ), 10, 3 );
}
/**
* Removes "added_{$this->meta_type}_meta" action
*
* @since 2.3
*/
protected function remove_add_meta_action() {
remove_action( "added_{$this->meta_type}_meta", array( $this, 'add_meta' ), 10, 4 );
}
/**
* Removes all meta synchronization actions and filters
*
* @since 2.3
*/
protected function remove_all_meta_actions() {
$this->remove_add_meta_action();
remove_filter( "update_{$this->meta_type}_metadata", array( $this, 'update_metadata' ), 999, 5 );
remove_action( "update_{$this->meta_type}_meta", array( $this, 'update_meta' ), 10, 4 );
remove_action( "delete_{$this->meta_type}_meta", array( $this, 'store_metas_to_sync' ), 10, 2 );
remove_action( "deleted_{$this->meta_type}_meta", array( $this, 'delete_meta' ), 10, 4 );
}
/**
* Adds "added_{$this->meta_type}_meta" action
*
* @since 2.3
*/
protected function restore_add_meta_action() {
add_action( "added_{$this->meta_type}_meta", array( $this, 'add_meta' ), 10, 4 );
}
/**
* Adds meta synchronization actions and filters
*
* @since 2.3
*/
protected function add_all_meta_actions() {
$this->restore_add_meta_action();
add_filter( "update_{$this->meta_type}_metadata", array( $this, 'update_metadata' ), 999, 5 ); // Very late in case a filter prevents the meta to be updated
add_action( "update_{$this->meta_type}_meta", array( $this, 'update_meta' ), 10, 4 );
add_action( "delete_{$this->meta_type}_meta", array( $this, 'store_metas_to_sync' ), 10, 2 );
add_action( "deleted_{$this->meta_type}_meta", array( $this, 'delete_meta' ), 10, 4 );
}
/**
* Maybe modify ("translate") a meta value when it is copied or synchronized
*
* @since 2.3
*
* @param mixed $value Meta value
* @param string $key Meta key
* @param int $from Id of the source
* @param int $to Id of the target
* @param string $lang Language of target
* @return mixed
*/
protected function maybe_translate_value( $value, $key, $from, $to, $lang ) {
/**
* Filter a meta value before is copied or synchronized
*
* @since 2.3
*
* @param mixed $value Meta value
* @param string $key Meta key
* @param string $lang Language of target
* @param int $from Id of the source
* @param int $to Id of the target
*/
return apply_filters( "pll_translate_{$this->meta_type}_meta", maybe_unserialize( $value ), $key, $lang, $from, $to );
}
/**
* Get the custom fields to copy or synchronize
*
* @since 2.3
*
* @param int $from Id of the post from which we copy informations
* @param int $to Id of the post to which we paste informations
* @param string $lang Language slug
* @param bool $sync True if it is synchronization, false if it is a copy
* @return array List of meta keys
*/
protected function get_metas_to_copy( $from, $to, $lang, $sync = false ) {
/**
* Filter the custom fields to copy or synchronize
*
* @since 0.6
* @since 1.9.2 The `$from`, `$to`, `$lang` parameters were added.
*
* @param array $keys List of custom fields names
* @param bool $sync True if it is synchronization, false if it is a copy
* @param int $from Id of the post from which we copy informations
* @param int $to Id of the post to which we paste informations
* @param string $lang Language slug
*/
return array_unique( apply_filters( "pll_copy_{$this->meta_type}_metas", array(), $sync, $from, $to, $lang ) );
}
/**
* Synchronize added metas across translations
*
* @since 2.3
*
* @param int $mid Meta id.
* @param int $id Object ID.
* @param string $meta_key Meta key.
* @param mixed $meta_value Meta value. Must be serializable if non-scalar.
*/
public function add_meta( $mid, $id, $meta_key, $meta_value ) {
static $avoid_recursion = false;
if ( ! $avoid_recursion ) {
$avoid_recursion = true;
$tr_ids = $this->model->{$this->meta_type}->get_translations( $id );
foreach ( $tr_ids as $lang => $tr_id ) {
if ( $tr_id != $id ) {
$to_copy = $this->get_metas_to_copy( $id, $tr_id, $lang, true );
if ( in_array( $meta_key, $to_copy ) ) {
$meta_value = $this->maybe_translate_value( $meta_value, $meta_key, $id, $tr_id, $lang );
add_metadata( $this->meta_type, $tr_id, $meta_key, $meta_value );
}
}
}
$avoid_recursion = false;
}
}
/**
* Stores the previous value when updating metas
*
* @since 2.3
*
* @param null|bool $r Not used
* @param int $id Object ID.
* @param string $meta_key Meta key.
* @param mixed $meta_value Meta value. Must be serializable if non-scalar.
* @param mixed $prev_value If specified, only update existing metadata entries with the specified value.
* @return null|bool Unchanged
*/
public function update_metadata( $r, $id, $meta_key, $meta_value, $prev_value ) {
if ( null === $r ) {
$hash = md5( "$id|$meta_key|" . maybe_serialize( $meta_value ) );
$this->prev_value[ $hash ] = $prev_value;
}
return $r;
}
/**
* Synchronize updated metas across translations
*
* @since 2.3
*
* @param int $mid Meta id.
* @param int $id Object ID.
* @param string $meta_key Meta key.
* @param mixed $meta_value Meta value. Must be serializable if non-scalar.
*/
public function update_meta( $mid, $id, $meta_key, $meta_value ) {
static $avoid_recursion = false;
if ( ! $avoid_recursion ) {
$avoid_recursion = true;
$hash = md5( "$id|$meta_key|" . maybe_serialize( $meta_value ) );
$tr_ids = $this->model->{$this->meta_type}->get_translations( $id );
foreach ( $tr_ids as $lang => $tr_id ) {
if ( $tr_id != $id ) {
$to_copy = $this->get_metas_to_copy( $id, $tr_id, $lang, true );
if ( in_array( $meta_key, $to_copy ) ) {
$meta_value = $this->maybe_translate_value( $meta_value, $meta_key, $id, $tr_id, $lang );
$prev_meta = get_metadata_by_mid( $this->meta_type, $mid );
if ( empty( $this->prev_value[ $hash ] ) || $this->prev_value[ $hash ] === $prev_meta->meta_value ) {
$prev_value = $this->maybe_translate_value( $prev_meta->meta_value, $meta_key, $id, $tr_id, $lang );
$this->remove_add_meta_action(); // We don't want to sync back the new metas
update_metadata( $this->meta_type, $tr_id, $meta_key, $meta_value, $prev_value );
$this->restore_add_meta_action();
}
}
}
}
unset( $this->prev_value[ $hash ] );
$avoid_recursion = false;
}
}
/**
* Store metas to synchronize before deleting them
*
* @since 2.3
*
* @param array $mids Not used
* @param int $id Object ID.
*/
public function store_metas_to_sync( $mids, $id ) {
$tr_ids = $this->model->{$this->meta_type}->get_translations( $id );
foreach ( $tr_ids as $lang => $tr_id ) {
$this->to_copy[ $id ][ $tr_id ] = $this->get_metas_to_copy( $id, $tr_id, $lang, true );
}
}
/**
* Synchronize deleted meta across translations
*
* @since 2.3
*
* @param array $mids Not used
* @param int $id Object ID.
* @param string $key Meta key.
* @param mixed $value Meta value.
*/
public function delete_meta( $mids, $id, $key, $value ) {
static $avoid_recursion = false;
if ( ! $avoid_recursion ) {
$avoid_recursion = true;
$tr_ids = $this->model->{$this->meta_type}->get_translations( $id );
foreach ( $tr_ids as $lang => $tr_id ) {
if ( $tr_id != $id ) {
if ( in_array( $key, $this->to_copy[ $id ][ $tr_id ] ) ) {
if ( '' !== $value && null !== $value && false !== $value ) { // Same test as WP
$value = $this->maybe_translate_value( $value, $key, $id, $tr_id, $lang );
}
delete_metadata( $this->meta_type, $tr_id, $key, $value );
}
}
}
}
$avoid_recursion = false;
}
/**
* Copy or synchronize metas
*
* @since 2.3
*
* @param int $from Id of the source object
* @param int $to Id of the target object
* @param string $lang Language code of the target object
* @param bool $sync Optional, defaults to true. True if it is synchronization, false if it is a copy
*/
public function copy( $from, $to, $lang, $sync = false ) {
$this->remove_all_meta_actions();
remove_action( "delete_{$this->meta_type}_meta", array( $this, 'store_metas_to_sync' ), 10, 2 );
remove_action( "deleted_{$this->meta_type}_meta", array( $this, 'delete_meta' ), 10, 4 );
$to_copy = $this->get_metas_to_copy( $from, $to, $lang, $sync );
$metas = get_metadata( $this->meta_type, $from );
$tr_metas = get_metadata( $this->meta_type, $to );
foreach ( $to_copy as $key ) {
if ( empty( $metas[ $key ] ) ) {
if ( ! empty( $tr_metas[ $key ] ) ) {
// If the meta key is not present in the source object, delete all values
delete_metadata( $this->meta_type, $to, $key );
}
} else {
if ( ! empty( $tr_metas[ $key ] ) && 1 === count( $metas[ $key ] ) && 1 === count( $tr_metas[ $key ] ) ) {
// One custom field to update
$value = reset( $metas[ $key ] );
$value = maybe_unserialize( $value );
$to_value = $this->maybe_translate_value( $value, $key, $from, $to, $lang );
update_metadata( $this->meta_type, $to, $key, $to_value );
} else {
// Multiple custom fields, either in the source or the target
if ( ! empty( $tr_metas[ $key ] ) ) {
// The synchronization of multiple values custom fields is easier if we delete all metas first
delete_metadata( $this->meta_type, $to, $key );
}
foreach ( $metas[ $key ] as $value ) {
$value = maybe_unserialize( $value );
$to_value = $this->maybe_translate_value( $value, $key, $from, $to, $lang );
add_metadata( $this->meta_type, $to, $key, $to_value );
}
}
}
}
$this->add_all_meta_actions();
}
/**
* If synchronized custom fields were previously not synchronized, it is expected
* that saving a post (or term) will synchronize them.
*
* @since 2.3
*
* @param int $object_id Id of the object being asaved
* @param object $obj Not used
* @param array $translations The list of translations object ids
*/
public function save_object( $object_id, $obj, $translations ) {
$src_lang = array_search( $object_id, $translations );
foreach ( $translations as $tr_lang => $tr_id ) {
if ( $tr_id != $object_id ) {
$this->copy( $object_id, $tr_id, $tr_lang, true );
}
}
}
}
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