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<?php
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/**
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* @brief DataLayer Handler class
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* @author <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
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* @copyright (c) Invision Power Services, Inc.
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* @license https://www.invisioncommunity.com/legal/standards/
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* @package Invision Community
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* @since Feb 2022
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*/
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namespace IPS\core\DataLayer;
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/* To prevent PHP errors (extending class does not exist) revealing path */
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if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
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{
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header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
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exit;
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}
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/**
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* Data Layer Handler class
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*/
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class _Handler
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{
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public static $cicHandlerClass = '\IPS\cloud\DataLayer\Handler';
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public static $handlerCacheKey = 'dataLayerHandlers';
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public $id = 'gtm';
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/**
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* Returns the enabled handlers to be used in the global template as an array of head and body HTML snippets.
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*
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* @return array
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*/
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public static function loadForTemplates()
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{
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$return = array();
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/* try to get from cache */
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$key = static::$handlerCacheKey;
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try
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{
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$cached = json_decode( \IPS\Data\Store::i()->$key, true );
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if ( \is_array( $cached ) )
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{
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return $cached;
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}
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}
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catch ( \OutOfRangeException $e ) {}
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$handlers = static::loadEnabled();
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if ( \IPS\Settings::i()->core_datalayer_use_gtm )
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{
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$handlers[] = static::gtm();
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}
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$headInserts = "<!-- Handlers -->\n\n<!-- Initializers -->\n";
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$bodyInserts = "<!-- Handlers -->\n";
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$headCodes = "";
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$eventCallbacks = array();
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$propertiesCallbacks = array();
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foreach ( $handlers as $handler )
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{
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if ( $handler->head_code )
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{
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$headCodes .= "\n{$handler->head_code}\n";
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}
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if ( $handler->body_code )
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{
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$bodyInserts .= "\n{$handler->body_code}\n";
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}
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if ( $handler->initializer_code AND $handler->use_js )
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{
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$formatted = str_replace( '{dataLayer}', $handler->datalayer_key, $handler->initializer_code );
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$code = <<<HTML
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<script>
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let initcode{$handler->id} = context => {
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if ( !(context instanceof Object) ) {
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return;
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}
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/* Set the key and time */
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let ips_time = IpsDataLayerConfig._properties.ips_time.enabled ? IpsDataLayerConfig._properties.ips_time.formatted_name : false;
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let ips_key = IpsDataLayerConfig._properties.ips_key.enabled ? IpsDataLayerConfig._properties.ips_key.formatted_name : false;
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if ( ips_time ) {
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context[ips_time] = Math.floor( Date.now() / 1000 );
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}
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if ( ips_key ) {
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let s = i => {
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return Math.floor((1 + Math.random()) * Math.pow(16, i))
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.toString(16)
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.substring(1);
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};
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let mt = Date.now();
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let sec = Math.floor(mt / 1000);
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let secString = sec.toString(16);
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secString = secString.substring( secString.length - 8 );
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let ms = ( mt - ( sec * 1000 ) ) * 1000; // milliseconds
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let msString = (ms + 0x100000).toString(16).substring(1);
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let randomId = secString + msString + s(1) + '.' + s(4) + s(4);
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context[ips_key] = randomId;
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}
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for ( let i in context ) {
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if ( context[i] === null ) {
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context[i] = undefined;
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}
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}
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try {
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$formatted
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} catch (e) {
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Debug.error('Bad Data Layer Initializer: Event initializer failed!');
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}
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};
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initcode{$handler->id}(IpsDataLayerContext || {});
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</script>
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HTML;
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$code = \preg_replace( '/\/\/(.*)[\n|\r]/', '/*$1*/', $code );
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$code = \preg_replace( '/\s+/', ' ', $code);
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$headInserts .= \str_replace("\n", ' ', $code ) . "\n";
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}
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if ( $handler->event_handler AND $handler->use_js )
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{
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$formatted = str_replace( '{dataLayer}', $handler->datalayer_key, $handler->event_handler );
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$code = <<<JS
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( () => _event => {
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try {
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$formatted
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} catch (e) {
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Debug.error( e );
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}
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} )
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JS;
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$code = \preg_replace( '/\/\/(.*)[\n|\r]?/', '/*$1*/', $code );
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$code = \preg_replace( '/\s+/', ' ', $code);
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$eventCallbacks[] = \str_replace( "\n", ' ', $code );
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}
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if ( $handler->properties_handler AND $handler->use_js )
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{
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$formatted = str_replace( '{dataLayer}', $handler->datalayer_key, $handler->properties_handler );
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$code = <<<JS
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( () => _properties => {
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try {
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$formatted
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} catch (e) {
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Debug.error( e );
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}
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} )
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JS;
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$code = \preg_replace( '/\/\/(.*)[\n|\r]?/', '/*$1*/', $code );
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$code = \preg_replace( '/\s+/', ' ', $code);
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$propertiesCallbacks[] = \str_replace( "\n", ' ', $code );
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}
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}
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$headInserts .= "<!-- END Initializers -->\n";
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$headInserts .= "\n<!-- Head Snippets -->\n$headCodes\n<!-- END Head Snippets -->\n";
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$eventsJoined = implode( ",\n\t", $eventCallbacks );
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$headInserts .= <<<HTML
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<!-- Event Callbacks -->
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<script>
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const IpsDataLayerEventHandlers = [
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$eventsJoined
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];
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</script>
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<!-- END Event Callbacks -->
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HTML;
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$propertiesJoined = implode( ",\n\t", $propertiesCallbacks );
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$headInserts .= <<<HTML
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<!-- Properties Callbacks -->
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<script>
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const IpsDataLayerPropertiesHandlers = [
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$propertiesJoined
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];
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</script>
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<!-- END Properties Callbacks -->
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HTML;
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$headInserts .= "\n<!-- END Handlers -->";
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$bodyInserts .= "\n<!-- END Handlers -->";
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$return = array(
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'headInserts' => $headInserts,
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'bodyInserts' => $bodyInserts,
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);
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/* add to cache before returning */
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\IPS\Data\Store::i()->$key = json_encode( $return );
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return $return;
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}
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/**
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* Get all enabled handlers
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*
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* @return static[]
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*/
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public static function loadEnabled()
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{
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if ( class_exists( static::$cicHandlerClass ) )
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{
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$class = static::$cicHandlerClass;
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return $class::loadEnabled();
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}
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return array();
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}
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/**
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* Get a built in gtm handler
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*
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* @return static
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*/
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public static function gtm()
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{
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$gtm = new static();
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$gtm->initializer_code = <<<JS
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if (context instanceof Object) {
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{dataLayer} = {dataLayer} || [];
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{dataLayer}.push(context);
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return;
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}
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Debug.log( 'Invalid Data Layer Context: The IPS GTM Data Layer Initializer failed because the context wasn\'t an Object' );
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JS;
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$gtm->head_code = \IPS\Settings::i()->googletag_head_code;
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$gtm->use_js = true;
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$gtm->body_code = \IPS\Settings::i()->googletag_noscript_code;
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$gtm->datalayer_key = \IPS\Settings::i()->core_datalayer_gtmkey ?: 'window.dataLayer';
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$gtm->event_handler = <<<JS
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if ( (_event._properties instanceof Object) && (typeof _event._key === 'string')) {
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{dataLayer} = {dataLayer} || [];
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let properties = {};
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for ( let pKey in _event._properties ) {
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properties[_event._key + '.' + pKey] = _event._properties[pKey];
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}
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{dataLayer}.push( { ...properties, 'event': _event._key } );
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return;
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}
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Debug.log( 'Invalid Data Layer Event: An event wasn\'t processed by the IPS GTM Data Layer Handler. The event\'s _key has to be a string, and its _properties has to be an Object.' );
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JS;
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$gtm->properties_handler = <<<JS
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if ( _properties instanceof Object ) {
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delete _properties.event; // this cannot be set since this handler is NOT for adding GTM events
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{dataLayer} = {dataLayer} || [];
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{dataLayer}.push( _properties );
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}
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JS;
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return $gtm;
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}
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/**
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* Get all handler objects according to the where clause
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*
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* @param array $where The where clause
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*
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* @return array
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* @throws \UnexpectedValueException If $where contains invalid fields and/or invalid SQL logic
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*/
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public static function loadWhere( array $where=array() )
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{
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if ( ( $class = static::$cicHandlerClass ) AND class_exists( $class ) )
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{
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return $class::loadWhere( $where );
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}
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return array();
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}
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/**
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* Mock instance method since our autoloader will complain if there are only static methods in a class
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*
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* @return bool
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*/
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public function mockFunction()
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{
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return true;
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}
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}
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