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<?php
namespace W3TC;
class Extension_Amp_Plugin {
private $is_amp_endpoint = null;
public function run() {
add_filter( 'w3tc_minify_js_enable',
array( $this, 'w3tc_minify_jscss_enable' ) );
add_filter( 'w3tc_minify_css_enable',
array( $this, 'w3tc_minify_jscss_enable' ) );
add_filter( 'w3tc_lazyload_can_process',
array( $this, 'w3tc_lazyload_can_process' ) );
add_filter( 'w3tc_footer_comment',
array( $this, 'w3tc_footer_comment' ) );
add_filter( 'w3tc_newrelic_should_disable_auto_rum',
array( $this, 'w3tc_newrelic_should_disable_auto_rum' ) );
add_filter( 'pgcache_flush_post_queued_urls',
array( $this, 'x_flush_post_queued_urls' ) );
add_filter( 'varnish_flush_post_queued_urls',
array( $this, 'x_flush_post_queued_urls' ) );
add_filter( 'w3tc_pagecache_set',
array( $this, 'w3tc_pagecache_set' ) );
}
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;
}
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;
}
public function w3tc_newrelic_should_disable_auto_rum( $reject_reason ) {
if ( $this->is_amp_endpoint() ) {
return 'AMP endpoint';
}
return $reject_reason;
}
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;
}
public function x_flush_post_queued_urls( $queued_urls ) {
$amp_urls = array();
foreach ( $queued_urls as $url ) {
$amp_urls[] = trailingslashit( $url ) . 'amp';
}
$queued_urls = array_merge( $queued_urls, $amp_urls );
return $queued_urls;
}
public function w3tc_footer_comment( $strings ) {
if ( $this->is_amp_endpoint() ) {
$strings[] = 'AMP page, minification is limited';
}
return $strings;
}
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;
}
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 );
}
}
public function w3tc_pagecache_set_header( $header, $header_original ) {
if ( $header_original['n'] == 'Link' && empty( $header_original['v'] ) ) {
// forces removal of Link header for file_generic when its set by
// parent .htaccess
return $header_original;
}
return $header;
}
}
$p = new Extension_Amp_Plugin();
$p->run();
if ( is_admin() ) {
$p = new Extension_Amp_Plugin_Admin();
$p->run();
}