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<?php

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/**

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* Class for handling a unique ID of the site.

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* @author OnTheGo Systems

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class WPML_Site_ID {

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/**

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* The name prefix of the option where the ID is stored.

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const SITE_ID_KEY = 'WPML_SITE_ID';

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/**

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* The default scope.

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const SITE_SCOPES_GLOBAL = 'global';

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/**

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* Memory cache of the IDs.

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* @var array

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private $site_ids = array();

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/**

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* Read and, if needed, generate the site ID based on the scope.

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* @param string $scope Defaults to "global".

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* Use a different value when the ID is used for specific scopes.

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* @param bool $create_new Forces the creation of a new ID.

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* @return string|null The generated/stored ID or null if it wasn't possible to generate/store the value.

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public function get_site_id( $scope = self::SITE_SCOPES_GLOBAL, $create_new = false ) {

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$generate = ! $this->read_value( $scope ) || $create_new;

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if ( $generate && ! $this->generate_site_id( $scope ) ) {

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return null;

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}

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return $this->get_from_cache( $scope );

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}

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/**

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* Geenrates the ID.

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* @param string $scope The scope of the ID.

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* @return bool

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private function generate_site_id( $scope ) {

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$site_url = get_site_url();

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$site_uuid = uuid_v5( $site_url, wp_generate_uuid4() );

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$time_uuid = uuid_v5( time(), wp_generate_uuid4() );

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return $this->write_value( uuid_v5( $site_uuid, $time_uuid ), $scope );

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}

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/**

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* Read the value from cache, if present, or from the DB.

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* @param string $scope The scope of the ID.

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* @return string

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private function read_value( $scope ) {

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if ( ! $this->get_from_cache( $scope ) ) {

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$this->site_ids[ $scope ] = get_option( $this->get_option_key( $scope ), null );

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}

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return $this->site_ids[ $scope ];

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}

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/**

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* Writes the value in DB and cache.

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* @param string $value The value to write.

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* @param string $scope The scope of the ID.

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* @return bool

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private function write_value( $value, $scope ) {

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if ( update_option( $this->get_option_key( $scope ), $value, false ) ) {

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$this->site_ids[ $scope ] = $value;

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return true;

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}

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return false;

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}

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/**

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* Gets the options key name based on the scope.

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* @param string $scope The scope of the ID.

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* @return string

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private function get_option_key( $scope ) {

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return self::SITE_ID_KEY . ':' . $scope;

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}

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/**

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* Gets the value from the memory cache.

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* @param string $scope The scope of the ID.

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* @return mixed|null

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private function get_from_cache( $scope ) {

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if ( array_key_exists( $scope, $this->site_ids ) && $this->site_ids[ $scope ] ) {

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return $this->site_ids[ $scope ];

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}

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return null;

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}

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}

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