| 1 |
<?php |
| 2 |
/** |
| 3 |
* CDN module — rewrites local asset URLs to a user-supplied pull-zone |
| 4 |
* CDN hostname (BunnyCDN, KeyCDN, Cloudflare R2, custom). |
| 5 |
* |
| 6 |
* Tier: Free per FEATURES.md "CDN Integration" §1-6 (LiteSpeed parity). |
| 7 |
* |
| 8 |
* @package XSpeed |
| 9 |
*/ |
| 10 |
|
| 11 |
declare(strict_types=1); |
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|
| 13 |
namespace XSpeed\Modules\Cdn; |
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|
| 15 |
defined( 'ABSPATH' ) || exit; |
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|
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use XSpeed\Cdn_Rewriter; |
| 18 |
use XSpeed\Module; |
| 19 |
|
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final class CdnModule extends Module { |
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|
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public const SLUG = 'cdn'; |
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public const TIER = self::TIER_FREE; |
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public const VERSION = '1.0.0'; |
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|
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public function ui_metadata(): array { |
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return array( |
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'label' => 'CDN', |
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'icon' => 'Globe', |
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'description' => 'Serve static assets (images, fonts, CSS, JS) from a pull-zone CDN host like BunnyCDN, KeyCDN, or your own.', |
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); |
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} |
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|
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public function settings_schema(): array { |
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return array( |
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'enabled' => array( |
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'type' => 'bool', |
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'default' => false, |
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'label' => 'Enable CDN', |
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'description' => 'Rewrite static asset URLs to the CDN hostname below. Your CDN must be a pull-zone configured to fetch from this site.', |
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), |
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'cdn_url' => array( |
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'type' => 'string', |
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'default' => '', |
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'label' => 'CDN URL', |
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'description' => 'CDN hostname, e.g. cdn.example.com. https:// and trailing slashes are stripped automatically.', |
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'dependsOn' => array( 'field' => 'enabled' ), |
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), |
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'included_extensions' => array( |
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'type' => 'list', |
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'default' => Cdn_Rewriter::DEFAULT_EXTENSIONS, |
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'item_type' => 'string', |
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'label' => 'Included File Extensions', |
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'description' => 'Only URLs ending in these extensions are rewritten. Defaults cover images, fonts, CSS, JS, and common media.', |
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'dependsOn' => array( 'field' => 'enabled' ), |
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), |
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'excluded_patterns' => array( |
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'type' => 'list', |
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'default' => array(), |
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'item_type' => 'string', |
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'label' => 'Excluded Patterns', |
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'description' => 'Glob patterns matched against the URL path. Matching URLs stay on the origin. Examples: /wp-admin/*, *.pdf, /private/*', |
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'dependsOn' => array( 'field' => 'enabled' ), |
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), |
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); |
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} |
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|
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public function conflicts(): array { |
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return array( |
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array( |
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'plugin' => 'cdn-enabler/cdn-enabler.php', |
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'feature' => 'cdn.rewrite', |
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'strategy' => \XSpeed\Conflict_Registry::STRATEGY_REFUSE, |
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'reason' => 'CDN Enabler rewrites the same URLs; running both will double-rewrite or produce broken hosts.', |
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), |
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); |
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} |
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|
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public function boot(): void { |
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// Always-on: normalize cdn_url on save (admin context too). |
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add_filter( 'pre_update_option_xspeed_module_cdn', array( $this, 'normalize_on_save' ), 10, 1 ); |
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|
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// CDN URLs are baked into cached HTML, so a settings change that |
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// isn't followed by a purge is invisible: the user edits the CDN |
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// host, reloads, sees the old host still served from cache, and |
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// concludes the feature is broken. Also keeps the font-CORS rules |
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// in .htaccess in step with the enabled flag. |
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add_action( 'update_option_xspeed_module_cdn', array( $this, 'on_settings_change' ), 10, 0 ); |
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|
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if ( is_admin() || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) || ( defined( 'DOING_CRON' ) && DOING_CRON ) || ( defined( 'REST_REQUEST' ) && REST_REQUEST ) ) { |
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return; |
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} |
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$opts = $this->get_settings(); |
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if ( empty( $opts['enabled'] ) || empty( $opts['cdn_url'] ) ) { |
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return; |
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} |
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Cdn_Rewriter::reset_state(); |
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|
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// Attachment URLs still go through their own filter: media-library |
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// URLs are frequently consumed as PHP strings (feeds, oEmbed, REST |
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// echoes) rather than emitted into the page HTML we rewrite below. |
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add_filter( 'wp_get_attachment_url', array( $this, 'rewrite_attachment_url' ), 1000 ); |
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|
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// Preconnect to the CDN host. Every asset on the page now resolves |
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// there, so paying the DNS + TLS handshake once up front rather than |
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// on first asset request is worth the one tag. |
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add_filter( 'wp_resource_hints', array( $this, 'add_preconnect' ), 10, 2 ); |
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|
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// Whole-page pass. |
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// |
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// This module used to hook only the_content, post_thumbnail_html and |
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// widget_text_content — four filters that between them can never |
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// contain a stylesheet, a script or a font. So `css`, `js` and the |
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// five font extensions shipped ticked by default and rewrote nothing: |
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// a user enabled the CDN, saw them enabled, and found zero requests |
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// in their pull zone. |
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// |
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// Enqueued assets can't be reached with those filters at all, and |
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// hooking style_loader_src/script_loader_src would still miss inline |
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// url(), hardcoded theme-template images and third-party echo output. |
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// One pass over the finished page catches every category at once. |
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// |
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// It also fixes the srcset split: core builds srcset from |
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// wp_get_upload_dir() and never calls wp_get_attachment_url(), so a |
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// theme image previously got a CDN `src` and an origin `srcset` in |
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// the same tag. |
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// |
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// Cost: on the cache-write path this runs once per MISS and the CDN |
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// URLs bake into the stored HTML, so cache HITs pay nothing. This is |
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// what Powered Cache, Breeze and SpeedyCache all do. The trade-off is |
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// that turning the CDN off needs a cache purge — handled by |
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// purge_on_change() below. |
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add_filter( |
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'xspeed_cache_final_html', |
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static function ( $html ) { |
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if ( ! self::should_rewrite_request() ) { |
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return $html; |
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} |
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return Cdn_Rewriter::process_html( (string) $html ); |
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}, |
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// After Resource Hints (10) so any preload/preconnect tag it |
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// injects gets its URL rewritten too. |
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20, |
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1 |
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); |
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|
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// Cache-off path: the filter above never fires, so buffer the page |
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// ourselves. Guarded so we never double-buffer when the cache engine |
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// is running. |
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if ( ! $this->cache_enabled() ) { |
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add_action( |
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'template_redirect', |
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static function () { |
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if ( self::$buffering || ! self::should_rewrite_request() ) { |
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return; |
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} |
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self::$buffering = true; |
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ob_start( |
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static function ( $buffer ) { |
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if ( strlen( (string) $buffer ) < 255 ) { |
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return $buffer; |
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} |
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return Cdn_Rewriter::process_html( (string) $buffer ); |
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} |
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); |
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}, |
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9 |
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); |
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} |
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} |
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|
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/** |
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* Guard against opening our buffer twice on one request. |
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* |
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* @var bool |
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*/ |
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private static $buffering = false; |
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|
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/** |
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* Should this request have its asset URLs rewritten at all? |
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* |
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* The module's original bail set covered admin / AJAX / cron / REST only. |
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* These four are the remaining request types where a CDN URL is either |
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* wrong or actively unhelpful: |
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* |
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* - Previews render unsaved content for one logged-in author; pointing |
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* their assets at a pull zone caches a draft at the edge. |
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* - robots.txt and trackbacks are not HTML and have no assets. |
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* - Non-GET requests are form posts and API calls, never a page whose |
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* asset URLs matter. |
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*/ |
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public static function should_rewrite_request(): bool { |
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$method = isset( $_SERVER['REQUEST_METHOD'] ) |
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? strtoupper( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) ) |
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: 'GET'; |
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if ( 'GET' !== $method && 'HEAD' !== $method ) { |
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return false; |
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} |
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if ( function_exists( 'is_preview' ) && is_preview() ) { |
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return false; |
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} |
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if ( function_exists( 'is_robots' ) && is_robots() ) { |
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return false; |
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} |
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if ( function_exists( 'is_trackback' ) && is_trackback() ) { |
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return false; |
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} |
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if ( function_exists( 'is_feed' ) && is_feed() ) { |
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return false; |
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} |
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|
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/** |
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* Final say on whether to rewrite asset URLs for this request. |
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* |
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* @param bool $should Whether to rewrite. |
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*/ |
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return (bool) apply_filters( 'xspeed_cdn_should_rewrite', true ); |
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} |
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|
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/** |
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* Is the page cache on? When it is, Cache::finalize_buffer() runs and our |
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* xspeed_cache_final_html filter fires — so we must NOT also ob_start(). |
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*/ |
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private function cache_enabled(): bool { |
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$legacy = \XSpeed\Settings_Manager::get( 'legacy' ); |
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if ( is_array( $legacy ) && ! empty( $legacy['cache_enabled'] ) ) { |
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return true; |
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} |
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$opts = get_option( 'xspeed_options' ); |
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return is_array( $opts ) && ! empty( $opts['cache_enabled'] ); |
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} |
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|
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/** |
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* Settings changed — purge the page cache and re-sync the font-CORS |
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* rules in .htaccess. |
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*/ |
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public function on_settings_change(): void { |
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$this->sync_font_cors(); |
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if ( class_exists( '\\XSpeed\\Cache' ) ) { |
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\XSpeed\Cache::purge_all( 'cdn settings change' ); |
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} |
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} |
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|
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/** |
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* Write (or remove) the Apache/LiteSpeed font-CORS block. |
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* |
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* nginx hosts get the same directives through nginx_directives() and the |
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* unified server-block snippet instead — we can't write their config. |
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*/ |
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public function sync_font_cors(): void { |
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if ( ! class_exists( '\\XSpeed\\Server' ) || ! \XSpeed\Server::supports_htaccess() ) { |
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return; |
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} |
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if ( ! function_exists( 'insert_with_markers' ) ) { |
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require_once ABSPATH . 'wp-admin/includes/misc.php'; |
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} |
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if ( ! function_exists( 'insert_with_markers' ) ) { |
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return; |
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} |
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|
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$opts = $this->get_settings(); |
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$active = ! empty( $opts['enabled'] ) && ! empty( $opts['cdn_url'] ); |
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|
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$rules = $active |
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? array( |
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'<IfModule mod_headers.c>', |
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' # Allow the CDN to pull webfonts cross-origin.', |
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' <FilesMatch "\\.(woff2?|ttf|otf|eot)$">', |
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' Header always set Access-Control-Allow-Origin "*"', |
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' </FilesMatch>', |
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'</IfModule>', |
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) |
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: array(); |
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|
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// ABSPATH rather than get_home_path(): that function lives in |
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// wp-admin/includes/file.php, which is not loaded on a REST, CLI or |
| 277 |
// cron request — and because this class is namespaced, the |
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// unqualified call resolved to XSpeed\Modules\Cdn\get_home_path() |
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// and fatalled on every real save, including disabling the module. |
| 280 |
// This mirrors class-gzip.php, and the file_exists() guard it brings |
| 281 |
// also stops insert_with_markers() creating a stray .htaccess at the |
| 282 |
// WP root on a subdirectory install. |
| 283 |
$htaccess = ABSPATH . '.htaccess'; |
| 284 |
if ( ! file_exists( $htaccess ) ) { |
| 285 |
// Nothing to amend, and nothing to clean up. |
| 286 |
if ( empty( $rules ) ) { |
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return; |
| 288 |
} |
| 289 |
if ( ! is_writable( ABSPATH ) ) { |
| 290 |
return; |
| 291 |
} |
| 292 |
} |
| 293 |
|
| 294 |
insert_with_markers( $htaccess, 'xSpeed CDN', $rules ); |
| 295 |
} |
| 296 |
|
| 297 |
/** |
| 298 |
* Font CORS for the origin. |
| 299 |
* |
| 300 |
* We ship the five font extensions enabled by default, and now that CSS |
| 301 |
* actually reaches the CDN, `@font-face` inside those stylesheets |
| 302 |
* resolves against the CDN host too. A font fetched cross-origin is a |
| 303 |
* CORS request: without `Access-Control-Allow-Origin` on the ORIGIN |
| 304 |
* response, the CDN caches a response the browser then refuses, and every |
| 305 |
* webfont silently falls back to a system face. |
| 306 |
* |
| 307 |
* This was latent before — nothing reached the CDN, so nothing broke. |
| 308 |
* Fixing the rewrite without this would turn a dead setting into a live |
| 309 |
* regression, which is why it ships in the same change. |
| 310 |
* |
| 311 |
* @return string|null nginx directives, or null when the CDN is off. |
| 312 |
*/ |
| 313 |
public function nginx_directives(): ?string { |
| 314 |
$opts = $this->get_settings(); |
| 315 |
if ( empty( $opts['enabled'] ) || empty( $opts['cdn_url'] ) ) { |
| 316 |
return null; |
| 317 |
} |
| 318 |
return "# Allow the CDN to pull webfonts cross-origin.\n" |
| 319 |
. "location ~* \\.(woff2?|ttf|otf|eot)$ {\n" |
| 320 |
. " add_header Access-Control-Allow-Origin \"*\" always;\n" |
| 321 |
. "}"; |
| 322 |
} |
| 323 |
|
| 324 |
/** |
| 325 |
* Emit a preconnect hint for the CDN host. |
| 326 |
* |
| 327 |
* @param array $hints URLs for this relation type. |
| 328 |
* @param string $relation_type One of dns-prefetch / preconnect / … |
| 329 |
* @return array |
| 330 |
*/ |
| 331 |
public function add_preconnect( $hints, $relation_type ) { |
| 332 |
if ( 'preconnect' !== $relation_type || ! is_array( $hints ) ) { |
| 333 |
return $hints; |
| 334 |
} |
| 335 |
if ( Cdn_Rewriter::is_dev_host() ) { |
| 336 |
return $hints; |
| 337 |
} |
| 338 |
$opts = $this->get_settings(); |
| 339 |
$host = Cdn_Rewriter::normalize_host( (string) ( $opts['cdn_url'] ?? '' ) ); |
| 340 |
if ( '' === $host ) { |
| 341 |
return $hints; |
| 342 |
} |
| 343 |
// crossorigin so the hint also warms the connection fonts will use — |
| 344 |
// font requests are CORS requests and would otherwise open a second |
| 345 |
// connection. |
| 346 |
$hints[] = array( |
| 347 |
'href' => '//' . $host, |
| 348 |
'crossorigin' => 'anonymous', |
| 349 |
); |
| 350 |
return $hints; |
| 351 |
} |
| 352 |
|
| 353 |
public function rewrite_attachment_url( $url ) { |
| 354 |
if ( ! is_string( $url ) || '' === $url ) { |
| 355 |
return $url; |
| 356 |
} |
| 357 |
return Cdn_Rewriter::rewrite_url( $url, $this->get_settings() ); |
| 358 |
} |
| 359 |
|
| 360 |
/** |
| 361 |
* pre_update_option filter — strips https:// + trailing slash from |
| 362 |
* cdn_url before storage, so we always work against a bare host. |
| 363 |
* |
| 364 |
* @param mixed $value |
| 365 |
* @return mixed |
| 366 |
*/ |
| 367 |
public function normalize_on_save( $value ) { |
| 368 |
if ( ! is_array( $value ) ) { |
| 369 |
return $value; |
| 370 |
} |
| 371 |
if ( isset( $value['cdn_url'] ) ) { |
| 372 |
$value['cdn_url'] = Cdn_Rewriter::normalize_host( (string) $value['cdn_url'] ); |
| 373 |
} |
| 374 |
return $value; |
| 375 |
} |
| 376 |
|
| 377 |
public function cli_commands(): array { |
| 378 |
return array( |
| 379 |
array( |
| 380 |
'name' => 'xspeed cdn', |
| 381 |
'callback' => array( $this, 'cli_handler' ), |
| 382 |
'shortdesc' => 'Show CDN settings + test rewriting a URL.', |
| 383 |
'synopsis' => array( |
| 384 |
array( |
| 385 |
'type' => 'positional', |
| 386 |
'name' => 'action', |
| 387 |
'options' => array( 'status', 'test' ), |
| 388 |
'optional' => true, |
| 389 |
), |
| 390 |
array( |
| 391 |
'type' => 'assoc', |
| 392 |
'name' => 'url', |
| 393 |
'optional' => true, |
| 394 |
), |
| 395 |
), |
| 396 |
), |
| 397 |
); |
| 398 |
} |
| 399 |
|
| 400 |
public function cli_handler( array $args, array $assoc ): void { |
| 401 |
$action = $args[0] ?? 'status'; |
| 402 |
$opts = $this->get_settings(); |
| 403 |
if ( 'test' === $action ) { |
| 404 |
$url = isset( $assoc['url'] ) ? (string) $assoc['url'] : ''; |
| 405 |
if ( '' === $url ) { |
| 406 |
\WP_CLI::error( 'Pass --url=<url> to test rewriting.' ); |
| 407 |
} |
| 408 |
Cdn_Rewriter::reset_state(); |
| 409 |
\WP_CLI::log( 'in: ' . $url ); |
| 410 |
\WP_CLI::log( 'out: ' . Cdn_Rewriter::rewrite_url( $url, $opts ) ); |
| 411 |
return; |
| 412 |
} |
| 413 |
\WP_CLI::log( sprintf( '%-22s %s', 'enabled', ! empty( $opts['enabled'] ) ? 'on' : 'off' ) ); |
| 414 |
\WP_CLI::log( sprintf( '%-22s %s', 'cdn_url', (string) ( $opts['cdn_url'] ?? '' ) ) ); |
| 415 |
\WP_CLI::log( sprintf( '%-22s %s', 'included_extensions', implode( ',', (array) ( $opts['included_extensions'] ?? array() ) ) ) ); |
| 416 |
\WP_CLI::log( sprintf( '%-22s %s', 'excluded_patterns', implode( ',', (array) ( $opts['excluded_patterns'] ?? array() ) ) ) ); |
| 417 |
} |
| 418 |
} |
| 419 |
|
