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<?php
/**
* Service worker related functions of SuperPWA
*
* @since 1.0
*
* @function superpwa_sw() Service worker filename, absolute path and link
* @function superpwa_generate_sw() Generate and write service worker into sw.js
* @function superpwa_sw_template() Service worker tempalte
* @function superpwa_register_sw() Register service worker
* @function superpwa_delete_sw() Delete service worker
* @function superpwa_offline_page_images() Add images from offline page to filesToCache
*/
// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;
/**
* Returns the Service worker's filename.
*
* @since 2.0
*
* @return string
*/
function superpwa_get_sw_filename() {
return apply_filters( 'superpwa_sw_filename', 'superpwa-sw' . superpwa_multisite_filename_postfix() . '.js' );
}
/**
* Service worker filename, absolute path and link
*
* For Multisite compatibility. Used to be constants defined in superpwa.php
* On a multisite, each sub-site needs a different service worker.
*
* @param $arg filename for service worker filename (replaces SUPERPWA_SW_FILENAME)
* abs for absolute path to service worker (replaces SUPERPWA_SW_ABS)
* src for link to service worker (replaces SUPERPWA_SW_SRC). Default value
*
* @return (string) filename, absolute path or link to manifest.
*
* @since 1.6
* @since 1.7 src to service worker is made relative to accomodate for domain mapped multisites.
* @since 1.8 Added filter superpwa_sw_filename.
* @since 2.0 src actually returns the link and the URL_PATH is extracted in superpwa_register_sw().
* @since 2.0 src uses home_url instead of network_site_url since manifest is no longer in the root folder.
*/
function superpwa_sw( $arg = 'src' ) {
$sw_filename = superpwa_get_sw_filename();
switch( $arg ) {
// TODO: Case `filename` can be deprecated in favor of @see superpwa_get_sw_filename().
// Name of service worker file
case 'filename':
return $sw_filename;
break;
/**
* Absolute path to service worker. SW must be in the root folder.
*
* @since 2.0 service worker is no longer a physical file and absolute path doesn't make sense.
* Also using home_url instead of network_site_url in "src" in 2.0 changes the apparent location of the file.
* However, absolute path is preserved at the "old" location, so that phyiscal files can be deleted when upgrading from pre-2.0 versions.
*/
case 'abs':
return trailingslashit( ABSPATH ) . $sw_filename;
break;
// Link to service worker
case 'src':
default:
// Get Settings
$settings = superpwa_get_settings();
/**
* For static file, return site_url and network_site_url
*
* Static files are generated in the root directory.
* The site_url template tag retrieves the site url for the
* current site (where the WordPress core files reside).
*/
if ( $settings['is_static_sw'] === 1 ) {
return trailingslashit( network_site_url() ) . $sw_filename;
}
// For dynamic files, return the home_url
return home_url( '/' ) . $sw_filename;
break;
}
}
/**
* Generate and write service worker into superpwa-sw.js
*
* Starting with 2.0, files are only generated if dynamic files are not possible.
* Some webserver configurations does not load WordPress and attempts to server files directly
* from the server. This returns 404 when files do not exist physically.
*
* @return (boolean) true on success, false on failure.
*
* @author Arun Basil Lal
*
* @since 1.0
* @since 2.0 Deprecated since Service worker is generated on the fly {@see superpwa_generate_sw_and_manifest_on_fly()}.
* @since 2.0.1 No longer deprecated since physical files are now generated in certain cases. See funtion description.
*
*/
function superpwa_get_language_shortcode() {
return apply_filters( 'wpml_current_language', null );
}
function superpwa_generate_sw() {
// Delete service worker if it exists
superpwa_delete_sw();
// Get Settings
$settings = superpwa_get_settings();
$wpml_settings = get_option( 'superpwa_wpml_settings');
if (isset($wpml_settings['enable_wpml']) && $wpml_settings['enable_wpml'] == 1) {
$current_language = superpwa_get_language_shortcode();
$start_url = superpwa_home_url().$current_language;
$manifest['start_url'] = $start_url;
$manifest['scope'] = "/";
}
// Return true if dynamic file returns a 200 response.
if ( superpwa_file_exists( home_url( '/' ) . superpwa_get_sw_filename() ) && defined( 'WP_CACHE' ) && ! WP_CACHE ) {
// set file status as dynamic file in database.
$settings['is_static_sw'] = 0;
// Write settings back to database.
update_option( 'superpwa_settings', $settings );
return true;
}
$dynamic_check = (isset($settings['startpage_type']) && $settings['startpage_type'] =='active_url' && function_exists('superpwa_pro_init'))?false:true;
if ( $dynamic_check && superpwa_put_contents( superpwa_sw( 'abs' ), superpwa_sw_template() ) ) {
// set file status as satic file in database.
$settings['is_static_sw'] = 1;
// Write settings back to database.
update_option( 'superpwa_settings', $settings );
return true;
}
return false;
}
/**
* Service Worker Tempalte
*
* @return (string) Contents to be written to superpwa-sw.js
*
* @since 1.0
* @since 1.7 added filter superpwa_sw_template
* @since 1.9 added filter superpwa_sw_files_to_cache
*/
function superpwa_sw_template() {
// Get Settings
$settings = superpwa_get_settings();
$cache_version = SUPERPWA_VERSION;
if(isset($settings['force_update_sw_setting']) && $settings['force_update_sw_setting'] !=''){
$cache_version = $settings['force_update_sw_setting'];
if(!version_compare($cache_version,SUPERPWA_VERSION, '>=') ){
$cache_version = SUPERPWA_VERSION;
}
}
// Start output buffer. Everything from here till ob_get_clean() is returned
ob_start(); ?>
'use strict';
/**
* Service Worker of SuperPWA
* To learn more and add one to your website, visit - https://superpwa.com
*/
const cacheName = '<?php echo parse_url( get_bloginfo( 'url' ), PHP_URL_HOST ) . '-superpwa-' . $cache_version; ?>';
const startPage = '<?php echo superpwa_get_start_url(); ?>';
const offlinePage = '<?php echo superpwa_get_offline_page(); ?>';
const filesToCache = [<?php echo apply_filters( 'superpwa_sw_files_to_cache', 'startPage, offlinePage' ); ?>];
const neverCacheUrls = [<?php echo apply_filters( 'superpwa_sw_never_cache_urls', '/\/wp-admin/,/\/wp-login/,/preview=true/' ); ?>];
// Install
self.addEventListener('install', function(e) {
console.log('SuperPWA service worker installation');
e.waitUntil(
caches.open(cacheName).then(function(cache) {
console.log('SuperPWA service worker caching dependencies');
filesToCache.map(function(url) {
return cache.add(url).catch(function (reason) {
return console.log('SuperPWA: ' + String(reason) + ' ' + url);
});
});
})
);
});
// Activate
self.addEventListener('activate', function(e) {
console.log('SuperPWA service worker activation');
e.waitUntil(
caches.keys().then(function(keyList) {
return Promise.all(keyList.map(function(key) {
if ( key !== cacheName ) {
console.log('SuperPWA old cache removed', key);
return caches.delete(key);
}
}));
})
);
return self.clients.claim();
});
// Range Data Code
var fetchRangeData = function(event){
var pos = Number(/^bytes\=(\d+)\-$/g.exec(event.request.headers.get('range'))[1]);
console.log('Range request for', event.request.url, ', starting position:', pos);
event.respondWith(
caches.open(cacheName)
.then(function(cache) {
return cache.match(event.request.url);
}).then(function(res) {
if (!res) {
return fetch(event.request)
.then(res => {
return res.arrayBuffer();
});
}
return res.arrayBuffer();
}).then(function(ab) {
return new Response(
ab.slice(pos),
{
status: 206,
statusText: 'Partial Content',
headers: [
// ['Content-Type', 'video/webm'],
['Content-Range', 'bytes ' + pos + '-' +
(ab.byteLength - 1) + '/' + ab.byteLength]]
});
}));
}
// Fetch
self.addEventListener('fetch', function(e) {
// Return if the current request url is in the never cache list
if ( ! neverCacheUrls.every(checkNeverCacheList, e.request.url) ) {
console.log( 'SuperPWA: Current request is excluded from cache.' );
return;
}
// Return if request url protocal isn't http or https
if ( ! e.request.url.match(/^(http|https):\/\//i) )
return;
<?php if(!isset($settings['cache_external_urls']) || (isset($settings['cache_external_urls']) && $settings['cache_external_urls'] !== '1')){ ?>
// Return if request url is from an external domain.
if ( new URL(e.request.url).origin !== location.origin )
return;
<?php } ?>
// For POST requests, do not use the cache. Serve offline page if offline.
if ( e.request.method !== 'GET' ) {
e.respondWith(
fetch(e.request).catch( function() {
return caches.match(offlinePage);
})
);
return;
}
// For Range Headers
if (e.request.headers.has('range')) {
return;
}
// Revving strategy
if ( (e.request.mode === 'navigate' || e.request.mode === 'cors') && navigator.onLine ) {
e.respondWith(
fetch(e.request).then(function(response) {
return caches.open(cacheName).then(function(cache) {
cache.put(e.request, response.clone());
return response;
});
}).catch(function(){
// If the network is unavailable, get
return cache.match(e.request.url);
})
);
return;
}
//strategy_replace_start
e.respondWith(
caches.match(e.request).then(function(response) {
return response || fetch(e.request).then(function(response) {
return caches.open(cacheName).then(function(cache) {
cache.put(e.request, response.clone());
return response;
});
});
}).catch(function() {
return caches.match(offlinePage);
})
);
//strategy_replace_end
});
// Check if current url is in the neverCacheUrls list
function checkNeverCacheList(url) {
if ( this.match(url) ) {
return false;
}
return true;
}
<?php
if(isset($settings['analytics_support']) && $settings['analytics_support']==1){
echo 'importScripts("https://storage.googleapis.com/workbox-cdn/releases/6.0.2/workbox-sw.js");
if(workbox.googleAnalytics){
try{
workbox.googleAnalytics.initialize();
} catch (e){ console.log(e.message); }
}';
}
?>
<?php return apply_filters( 'superpwa_sw_template', ob_get_clean() );
}
/**
* Register service worker
*
* @refer https://developers.google.com/web/fundamentals/primers/service-workers/registration#conclusion
*
* @since 1.0
*/
function superpwa_register_sw() {
$settings = superpwa_get_settings();
$include_script = true;
if(isset($settings['exclude_homescreen']) && !empty($settings['exclude_homescreen'])){
$exclude_homescrn_setting = $settings['exclude_homescreen'];
$exclude_homescreen = explode(",",$settings['exclude_homescreen']);
$siteUrl = filter_input(INPUT_SERVER, 'REQUEST_URI');
$actual_link = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http").'://'.$_SERVER['HTTP_HOST'].$siteUrl;
if(in_array($actual_link, $exclude_homescreen)){
$include_script = false;
}
}
if($include_script){
wp_enqueue_script( 'superpwa-register-sw', SUPERPWA_PATH_SRC . 'public/js/register-sw.js', array(), null, true );
$superpwa_sw_version = isset($settings['force_update_sw_setting'])? $settings['force_update_sw_setting'] : time();
$localize = array(
'url' => parse_url( superpwa_sw( 'src' ), PHP_URL_PATH ).'?'.$superpwa_sw_version,
'disable_addtohome' => isset($settings['disable_add_to_home'])? $settings['disable_add_to_home'] : 0,
'enableOnDesktop'=> false,
'offline_message'=> !isset($settings['offline_message']) ? 1 : $settings['offline_message'],
'offline_message_txt'=> !isset($settings['offline_message_txt']) ? esc_html__('You are currently offline.','super-progressive-web-apps') : $settings['offline_message_txt'],
);
$localize = apply_filters('superpwa_sw_localize_data', $localize);
wp_localize_script( 'superpwa-register-sw', 'superpwa_sw', $localize);
}
}
add_action( 'wp_enqueue_scripts', 'superpwa_register_sw' );
/**
* Delete Service Worker
*
* @return true on success, false on failure
*
* @author Arun Basil Lal
*
* @since 1.0
*/
function superpwa_delete_sw() {
return superpwa_delete( superpwa_sw( 'abs' ) );
}
/**
* Add images from offline page to filesToCache
*
* If the offlinePage set by the user contains images, they need to be cached during sw install.
* For most websites, other assets (css, js) would be same as that of startPage which would be cached
* when user visits the startPage the first time. If not superpwa_sw_files_to_cache filter can be used.
*
* @param (string) $files_to_cache Comma separated list of files to cache during service worker install
*
* @return (string) Comma separated list with image src's appended to $files_to_cache
*
* @since 1.9
*/
function superpwa_offline_page_images( $files_to_cache ) {
// Get Settings
$settings = superpwa_get_settings();
// Retrieve the post
$post = get_post( $settings['offline_page'] );
// Return if the offline page is set to default
if( $post === NULL ) {
return $files_to_cache;
}
// Match all images
preg_match_all( '/<img[^>]+src="([^">]+)"/', $post->post_content, $matches );
// $matches[1] will be an array with all the src's
if( ! empty( $matches[1] ) ) {
return superpwa_httpsify( $files_to_cache . ', \'' . implode( '\', \'', $matches[1] ) . '\'' );
}
return $files_to_cache;
}
add_filter( 'superpwa_sw_files_to_cache', 'superpwa_offline_page_images' );
/**
* Exclude Urls from Cache list of service worker
*
* @since 2.1.2
*/
function superpwa_exclude_urls_cache_sw($never_cacheurls){
// Get Settings
$settings = superpwa_get_settings();
if(isset($settings['excluded_urls']) && !empty($settings['excluded_urls'])){
$exclude_from_cache = $settings['excluded_urls'];
$exclude_from_cache = str_replace('/', '\/', $exclude_from_cache);
$exclude_from_cache = '/'.str_replace(',', '/,/', $exclude_from_cache);
$exclude_from_cache = str_replace('\//', '/', $exclude_from_cache);
$exclude_from_cache = $exclude_from_cache.'endslash';
$exclude_from_cache = str_replace('\/endslash', '/', $exclude_from_cache);
$exclude_from_cache = str_replace('endslash', '/', $exclude_from_cache);
$never_cacheurls .= ','.$exclude_from_cache;
}
return $never_cacheurls;
}
add_filter( 'superpwa_sw_never_cache_urls', 'superpwa_exclude_urls_cache_sw' );
/**
* Get offline page
*
* @return (string) the URL of the offline page.
*
* @author Arun Basil Lal
*
* @since 2.0.1
*/
function superpwa_get_offline_page() {
// Get Settings
$settings = superpwa_get_settings();
return (isset($settings['offline_page'] ) && get_permalink( $settings['offline_page'] )) ? superpwa_httpsify( get_permalink( $settings['offline_page'] ) ) : superpwa_httpsify( superpwa_get_bloginfo( 'sw' ) );
}
function superpwa_sanitize_exclude_urls_cache_sw($urls)
{
$urls_array = explode(',',$urls);
foreach($urls_array as $key=>$url){
$urls_array[$key]=trailingslashit( $url );
}
return implode(',',$urls_array);
}
add_filter( 'superpwa_sw_never_cache_urls', 'superpwa_sanitize_exclude_urls_cache_sw' ,9999);