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sync-metas.php
<?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; add_filter( "add_{$this->meta_type}_metadata", array( $this, 'can_synchronize_metadata' ), 1, 3 ); add_filter( "update_{$this->meta_type}_metadata", array( $this, 'can_synchronize_metadata' ), 1, 3 ); add_filter( "delete_{$this->meta_type}_metadata", array( $this, 'can_synchronize_metadata' ), 1, 3 ); $this->add_all_meta_actions(); add_action( "pll_save_{$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 ) ); } /** * Disallow modifying synchronized meta if the current user can not modify translations * * @since 2.6 * * @param null|bool $check Whether to allow adding/updating/deleting metadata. * @param int $id Object ID. * @param string $meta_key Meta key. * @return null|bool */ public function can_synchronize_metadata( $check, $id, $meta_key ) { if ( ! $this->model->{$this->meta_type}->current_user_can_synchronize( $id ) ) { $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 ) ) { return false; } } } } return $check; } /** * 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, wp_slash( $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 ) ); $prev_meta = get_metadata_by_mid( $this->meta_type, $mid ); if ( $prev_meta ) { $this->remove_add_meta_action(); // We don't want to sync back the new metas $tr_ids = $this->model->{$this->meta_type}->get_translations( $id ); foreach ( $tr_ids as $lang => $tr_id ) { if ( $tr_id != $id && in_array( $meta_key, $this->get_metas_to_copy( $id, $tr_id, $lang, true ) ) ) { 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 ); $meta_value = $this->maybe_translate_value( $meta_value, $meta_key, $id, $tr_id, $lang ); update_metadata( $this->meta_type, $tr_id, $meta_key, wp_slash( $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, wp_slash( $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, wp_slash( $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, wp_slash( $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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