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<?php
/**
* File: Extension_Amp_Plugin.php
*
* @package W3TC
*/
namespace W3TC;
/**
* Class Extension_Amp_Plugin
*
* phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged
*/
class Extension_Amp_Plugin {
/**
* Is AMP endpoint
*
* @var bool|null
*/
private $is_amp_endpoint = null;
/**
* Adds actions for loading the AMP extension.
*
* @return void
*/
public static function wp_loaded() {
add_action( 'w3tc_extension_load', array( '\W3TC\Extension_Amp_Plugin', 'w3tc_extension_load' ) );
add_action( 'w3tc_extension_load_admin', array( '\W3TC\Extension_Amp_Plugin_Admin', 'w3tc_extension_load_admin' ) );
}
/**
* Loads the AMP extension by adding various filters.
*
* @return void
*/
public static function w3tc_extension_load() {
$o = new Extension_Amp_Plugin();
add_filter( 'w3tc_minify_js_enable', array( $o, 'w3tc_minify_jscss_enable' ) );
add_filter( 'w3tc_minify_css_enable', array( $o, 'w3tc_minify_jscss_enable' ) );
add_filter( 'w3tc_lazyload_can_process', array( $o, 'w3tc_lazyload_can_process' ) );
add_filter( 'w3tc_footer_comment', array( $o, 'w3tc_footer_comment' ) );
add_filter( 'w3tc_newrelic_should_disable_auto_rum', array( $o, 'w3tc_newrelic_should_disable_auto_rum' ) );
add_filter( 'pgcache_flush_post_queued_urls', array( $o, 'x_flush_post_queued_urls' ) );
add_filter( 'varnish_flush_post_queued_urls', array( $o, 'x_flush_post_queued_urls' ) );
add_filter( 'w3tc_pagecache_set', array( $o, 'w3tc_pagecache_set' ) );
add_filter( 'w3tc_config_default_values', array( $o, 'w3tc_config_default_values' ) );
// rules generation.
add_filter( 'w3tc_pagecache_rules_apache_accept_qs', array( $o, 'w3tc_pagecache_rules_x_accept_qs' ) );
add_filter( 'w3tc_pagecache_rules_apache_accept_qs_rules', array( $o, 'w3tc_pagecache_rules_apache_accept_qs_rules' ), 10, 2 );
add_filter( 'w3tc_pagecache_rules_apache_uri_prefix', array( $o, 'w3tc_pagecache_rules_apache_uri_prefix' ) );
add_filter( 'w3tc_pagecache_rules_nginx_accept_qs', array( $o, 'w3tc_pagecache_rules_x_accept_qs' ) );
add_filter( 'w3tc_pagecache_rules_nginx_accept_qs_rules', array( $o, 'w3tc_pagecache_rules_nginx_accept_qs_rules' ), 10, 2 );
add_filter( 'w3tc_pagecache_rules_nginx_uri_prefix', array( $o, 'w3tc_pagecache_rules_nginx_uri_prefix' ) );
}
/**
* Checks if the current request is an AMP endpoint.
*
* @return bool True if it is an AMP endpoint, false otherwise.
*/
private function is_amp_endpoint() {
// support for different plugins defining those own functions.
if ( is_null( $this->is_amp_endpoint ) ) {
if ( function_exists( 'is_amp_endpoint' ) ) {
$this->is_amp_endpoint = is_amp_endpoint();
} elseif ( function_exists( 'ampforwp_is_amp_endpoint' ) ) {
$this->is_amp_endpoint = ampforwp_is_amp_endpoint();
} elseif ( function_exists( 'is_better_amp' ) ) {
$this->is_amp_endpoint = is_better_amp();
}
}
return is_null( $this->is_amp_endpoint ) ? false : $this->is_amp_endpoint;
}
/**
* Enables or disables minification of JS and CSS for AMP endpoints.
*
* @param bool $enabled Whether minification is enabled.
*
* @return bool False if AMP endpoint, otherwise the original enabled value.
*/
public function w3tc_minify_jscss_enable( $enabled ) {
if ( $this->is_amp_endpoint() ) {
// amp has own rules for CSS and JS files, don't touch them by default.
return false;
}
return $enabled;
}
/**
* Determines if New Relic's auto RUM should be disabled for AMP endpoints.
*
* @param string $reject_reason The current rejection reason.
*
* @return string Modified rejection reason.
*/
public function w3tc_newrelic_should_disable_auto_rum( $reject_reason ) {
if ( $this->is_amp_endpoint() ) {
return 'AMP endpoint';
}
return $reject_reason;
}
/**
* Disables lazy loading on AMP endpoints.
*
* @param array $can_process Array indicating whether lazyload can process.
*
* @return array Modified can_process array.
*/
public function w3tc_lazyload_can_process( $can_process ) {
if ( $this->is_amp_endpoint() ) {
$can_process['enabled'] = false;
$can_process['reason'] = 'AMP endpoint';
}
return $can_process;
}
/**
* Modifies queued URLs to include AMP URLs.
*
* @param array $queued_urls List of queued URLs to be flushed.
*
* @return array Modified list of queued URLs.
*/
public function x_flush_post_queued_urls( $queued_urls ) {
$amp_urls = array();
$c = Dispatcher::config();
$url_postfix = $c->get_string( array( 'amp', 'url_postfix' ) );
if ( 'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) ) {
foreach ( $queued_urls as $url ) {
$amp_urls[] = $url . '?' . $url_postfix;
}
} else {
foreach ( $queued_urls as $url ) {
$amp_urls[] = trailingslashit( $url ) . $url_postfix;
}
}
$queued_urls = array_merge( $queued_urls, $amp_urls );
return $queued_urls;
}
/**
* Adds a comment to footer for AMP pages indicating limited minification.
*
* @param array $strings Array of strings for footer comments.
*
* @return array Modified array of footer comment strings.
*/
public function w3tc_footer_comment( $strings ) {
if ( $this->is_amp_endpoint() ) {
$strings[] = 'AMP page, minification is limited';
}
return $strings;
}
/**
* Modifies page cache set data for AMP pages.
*
* @param array $data The data to be cached.
*
* @return array Modified cache data.
*/
public function w3tc_pagecache_set( $data ) {
if ( $this->is_amp_endpoint() ) {
// workaround to prevent Link headers from parent page to appear in amp page coming from it's .htaccess.
$c = Dispatcher::config();
if ( $c->getf_boolean( 'minify.css.http2push' ) ||
$c->getf_boolean( 'minify.js.http2push' ) ) {
$data['headers'][] = array(
'n' => 'Link',
'v' => '',
'files_match' => '\\.html[_a-z]*$',
);
$this->w3tc_pagecache_set_header_register_once();
}
}
return $data;
}
/**
* Registers a filter for the page cache set header only once.
*
* @return void
*/
private function w3tc_pagecache_set_header_register_once() {
static $registered = false;
if ( ! $registered ) {
add_filter( 'w3tc_pagecache_set_header', array( $this, 'w3tc_pagecache_set_header' ), 20, 2 );
}
}
/**
* Modifies the page cache set header for AMP pages.
*
* @param array $header The current header.
* @param array $header_original The original header.
*
* @return array Modified header.
*/
public function w3tc_pagecache_set_header( $header, $header_original ) {
if ( 'Link' === $header_original['n'] && empty( $header_original['v'] ) ) {
// forces removal of Link header for file_generic when its set by parent .htaccess.
return $header_original;
}
return $header;
}
/**
* Sets the default values for AMP configuration.
*
* @param array $default_values The default configuration values.
*
* @return array Modified default values.
*/
public function w3tc_config_default_values( $default_values ) {
$default_values['amp'] = array(
'url_type' => 'tag',
'url_postfix' => 'amp',
);
return $default_values;
}
/**
* Normalizes URL fragments for AMP pages.
*
* @param array $url_fragments The URL fragments to be normalized.
*
* @return array Modified URL fragments.
*/
public static function pagecache_normalize_url_fragments( $url_fragments ) {
$c = Dispatcher::config();
if ( 'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) ) {
if ( ! empty( $url_fragments['querystring'] ) ) {
$qs = $c->get_string( array( 'amp', 'url_postfix' ) );
$url_qs = substr( $url_fragments['querystring'], 1 ); // cut off "?".
$regexp = Util_Environment::preg_quote( str_replace( '+', ' ', $qs ) );
if ( @preg_match( "~^(.*?&|)$regexp(=[^&]*)?(&.*|)$~i", $url_qs, $m ) ) {
$url_qs = $m[1] . $m[3];
$url_qs = preg_replace( '~[&]+~', '&', $url_qs );
$url_qs = trim( $url_qs, '&' );
$url_qs = empty( $url_qs ) ? '' : '?' . $url_qs;
$url_fragments['querystring'] = $url_qs;
$url_fragments['amp_extension'] = 1;
}
}
}
return $url_fragments;
}
/**
* Modifies the page cache key for AMP pages.
*
* @param array $o The original page cache data.
*
* @return array Modified page cache data.
*/
public static function pagecache_page_key( $o ) {
$c = Dispatcher::config();
if ( isset( $o['url_fragments']['amp_extension'] ) ) {
$o['key'][1] .= '_amp';
}
return $o;
}
/**
* Modifies query strings for AMP page cache rules.
*
* @param array $query_strings The query strings to be modified.
*
* @return array Modified query strings.
*/
public function w3tc_pagecache_rules_x_accept_qs( $query_strings ) {
$c = Dispatcher::config();
if ( 'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) ) {
$query_strings[] = $c->get_string( array( 'amp', 'url_postfix' ) );
}
return $query_strings;
}
/**
* Modifies Apache query rules for AMP URLs.
*
* @param array $query_rules The original query rules.
* @param string $query The query string to check.
*
* @return array Modified query rules.
*/
public function w3tc_pagecache_rules_apache_accept_qs_rules( $query_rules, $query ) {
$c = Dispatcher::config();
if (
'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) &&
$query === $c->get_string( array( 'amp', 'url_postfix' ) )
) {
$query_rules[1] = str_replace( '[E=', '[E=W3TC_AMP:_amp,E=', $query_rules[1] );
}
return $query_rules;
}
/**
* Modifies Apache URI prefix for AMP pages.
*
* @param string $uri_prefix The original URI prefix.
*
* @return string Modified URI prefix.
*/
public function w3tc_pagecache_rules_apache_uri_prefix( $uri_prefix ) {
$c = Dispatcher::config();
if ( 'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) ) {
$uri_prefix .= '%{ENV:W3TC_AMP}';
}
return $uri_prefix;
}
/**
* Modifies Nginx query rules for AMP URLs.
*
* @param array $query_rules The original query rules.
* @param string $query The query string to check.
*
* @return array Modified query rules.
*/
public function w3tc_pagecache_rules_nginx_accept_qs_rules( $query_rules, $query ) {
$c = Dispatcher::config();
if (
'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) &&
$query === $c->get_string( array( 'amp', 'url_postfix' ) )
) {
array_splice( $query_rules, 1, 0, ' set $w3tc_amp "_amp";' );
array_unshift( $query_rules, 'set $w3tc_amp "";' );
}
return $query_rules;
}
/**
* Modifies Nginx URI prefix for AMP pages.
*
* @param string $uri_prefix The original URI prefix.
*
* @return string Modified URI prefix.
*/
public function w3tc_pagecache_rules_nginx_uri_prefix( $uri_prefix ) {
$c = Dispatcher::config();
if ( 'querystring' === $c->get_string( array( 'amp', 'url_type' ) ) ) {
$uri_prefix .= '$w3tc_amp';
}
return $uri_prefix;
}
}
w3tc_add_action( 'pagecache_normalize_url_fragments', array( '\W3TC\Extension_Amp_Plugin', 'pagecache_normalize_url_fragments' ) );
w3tc_add_action( 'pagecache_page_key', array( '\W3TC\Extension_Amp_Plugin', 'pagecache_page_key' ) );
w3tc_add_action( 'wp_loaded', array( '\W3TC\Extension_Amp_Plugin', 'wp_loaded' ) );