Changeset 58935 for trunk/src/wp-includes/class-wp-dependencies.php

Timestamp:

08/25/2024 11:47:01 PM (2 years ago)

Author:

peterwilsoncc

Message:

Script Loader: Refactor Etag generation for concatenated assets.

Move Etag HTTP header generation in load-scripts.php and load-styles.php to WP_Dependencies.

Introduces the method WP_Dependencies::get_etag() and associated unit tests.

Follow up to [57943].

Props vrajadas, martinkrcho, mukesh27.
Fixes #61485.

File:

• trunk/src/wp-includes/class-wp-dependencies.php (modified) (1 diff)

trunk/src/wp-includes/class-wp-dependencies.php

@@ -491 +491 @@
                 return true;
         }
+
+        /**
+         * Get etag header for cache validation.
+         *
+         * @since 6.7.0
+         *
+         * @global string $wp_version The WordPress version string.
+         *
+         * @param string[] $load Array of script or style handles to load.
+         * @return string Etag header.
+         */
+        public function get_etag( $load ) {
+                /*
+                 * Note: wp_get_wp_version() is not used here, as this file can be included
+                 * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
+                 * wp-includes/functions.php is not loaded.
+                 */
+                global $wp_version;
+
+                $etag = "WP:{$wp_version};";
+
+                foreach ( $load as $handle ) {
+                        if ( ! array_key_exists( $handle, $this->registered ) ) {
+                                continue;
+                        }
+
+                        $ver   = $this->registered[ $handle ]->ver ?? $wp_version;
+                        $etag .= "{$handle}:{$ver};";
+                }
+
+                /*
+                 * This is not intended to be cryptographically secure, just a fast way to get
+                 * a fixed length string based on the script versions. As this file does not
+                 * load the full WordPress environment, it is not possible to use the salted
+                 * wp_hash() function.
+                 */
+                return 'W/"' . md5( $etag ) . '"';
+        }
 }