<?php

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/**

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* The Third Party integration with AMP plugin.

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*

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* @since 2.9.8.6

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* @package LiteSpeed

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* @subpackage LiteSpeed_Cache/thirdparty

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*/

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namespace LiteSpeed\Thirdparty;

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defined( 'WPINC' ) || exit;

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/**

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* Integration helpers for AMP-compatible behaviour.

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*

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* Disables optimization features on AMP endpoints provided by popular AMP

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* plugins to ensure valid AMP output (no injected JS/lazy/CSS async, etc).

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*/

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class AMP {

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/**

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* Maybe mark current request as AMP and disable conflicting optimizations.

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*

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* @since 4.2

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*

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* @param string $amp_function Callback/function name that returns whether current request is AMP.

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* @return void

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*/

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private static function _maybe_amp( $amp_function ) {

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if ( is_admin() ) {

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return;

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}

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// phpcs:ignore WordPress.Security.NonceVerification.Recommended

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if ( ! isset( $_GET['amp'] ) && ( ! function_exists( $amp_function ) || ! $amp_function() ) ) {

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return;

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}

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do_action( 'litespeed_debug', '[3rd] ❌ AMP disabled page optm/lazy' );

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defined( 'LITESPEED_NO_PAGEOPTM' ) || define( 'LITESPEED_NO_PAGEOPTM', true );

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defined( 'LITESPEED_NO_LAZY' ) || define( 'LITESPEED_NO_LAZY', true );

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defined( 'LITESPEED_NO_OPTM' ) || define( 'LITESPEED_NO_OPTM', true );

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// defined( 'LITESPEED_GUEST' ) || define( 'LITESPEED_GUEST', false );

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}

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/**

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* Ampforwp_is_amp_endpoint() from Accelerated Mobile Pages.

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*

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* @since 4.2

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* @return void

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*/

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public static function maybe_acc_mob_pages() {

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self::_maybe_amp( 'ampforwp_is_amp_endpoint' );

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}

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/**

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* Google AMP fix.

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*

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* @since 4.2.0.1

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* @return void

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*/

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public static function maybe_google_amp() {

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self::_maybe_amp( 'amp_is_request' );

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}

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/**

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* Preload hooks to detect AMP requests and turn off conflicting features.

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*

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* CSS async will affect AMP result and Lazyload injects JS libraries which

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* AMP does not allow. Ensure those are disabled early on AMP endpoints.

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*

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* @since 2.9.8.6

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* @access public

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* @return void

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*/

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public static function preload() {

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add_action( 'wp', __CLASS__ . '::maybe_acc_mob_pages' );

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add_action( 'wp', __CLASS__ . '::maybe_google_amp' );

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// amp_is_request() from AMP.

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// self::maybe_amp( 'amp_is_request' );

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// add_filter( 'litespeed_can_optm', '__return_false' );

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// do_action( 'litespeed_conf_force', API::O_OPTM_CSS_ASYNC, false );

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// do_action( 'litespeed_conf_force', API::O_MEDIA_LAZY, false );

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// do_action( 'litespeed_conf_force', API::O_MEDIA_IFRAME_LAZY, false );

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}

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}

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