1 files changed, 117 insertions, 0 deletions
diff --git a/www/wiki/includes/cache/ResourceFileCache.php b/www/wiki/includes/cache/ResourceFileCache.php
new file mode 100644
index 00000000..326d0659
--- /dev/null
+++ b/www/wiki/includes/cache/ResourceFileCache.php
@@ -0,0 +1,117 @@
+<?php
+/**
+ * ResourceLoader request result caching in the file system.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Cache
+ */
+
+/**
+ * ResourceLoader request result caching in the file system.
+ *
+ * @ingroup Cache
+ */
+class ResourceFileCache extends FileCacheBase {
+	protected $mCacheWorthy;
+
+	/* @todo configurable? */
+	const MISS_THRESHOLD = 360; // 6/min * 60 min
+
+	/**
+	 * Construct an ResourceFileCache from a context
+	 * @param ResourceLoaderContext $context
+	 * @return ResourceFileCache
+	 */
+	public static function newFromContext( ResourceLoaderContext $context ) {
+		$cache = new self();
+
+		if ( $context->getImage() ) {
+			$cache->mType = 'image';
+		} elseif ( $context->getOnly() === 'styles' ) {
+			$cache->mType = 'css';
+		} else {
+			$cache->mType = 'js';
+		}
+		$modules = array_unique( $context->getModules() ); // remove duplicates
+		sort( $modules ); // normalize the order (permutation => combination)
+		$cache->mKey = sha1( $context->getHash() . implode( '|', $modules ) );
+		if ( count( $modules ) == 1 ) {
+			$cache->mCacheWorthy = true; // won't take up much space
+		}
+
+		return $cache;
+	}
+
+	/**
+	 * Check if an RL request can be cached.
+	 * Caller is responsible for checking if any modules are private.
+	 * @param ResourceLoaderContext $context
+	 * @return bool
+	 */
+	public static function useFileCache( ResourceLoaderContext $context ) {
+		global $wgUseFileCache, $wgDefaultSkin, $wgLanguageCode;
+		if ( !$wgUseFileCache ) {
+			return false;
+		}
+		// Get all query values
+		$queryVals = $context->getRequest()->getValues();
+		foreach ( $queryVals as $query => $val ) {
+			if ( in_array( $query, [ 'modules', 'image', 'variant', 'version', '*' ] ) ) {
+				// Use file cache regardless of the value of this parameter
+				continue; // note: &* added as IE fix
+			} elseif ( $query === 'skin' && $val === $wgDefaultSkin ) {
+				continue;
+			} elseif ( $query === 'lang' && $val === $wgLanguageCode ) {
+				continue;
+			} elseif ( $query === 'only' && in_array( $val, [ 'styles', 'scripts' ] ) ) {
+				continue;
+			} elseif ( $query === 'debug' && $val === 'false' ) {
+				continue;
+			} elseif ( $query === 'format' && $val === 'rasterized' ) {
+				continue;
+			}
+
+			return false;
+		}
+
+		return true; // cacheable
+	}
+
+	/**
+	 * Get the base file cache directory
+	 * @return string
+	 */
+	protected function cacheDirectory() {
+		return $this->baseCacheDirectory() . '/resources';
+	}
+
+	/**
+	 * Item has many recent cache misses
+	 * @return bool
+	 */
+	public function isCacheWorthy() {
+		if ( $this->mCacheWorthy === null ) {
+			$this->mCacheWorthy = (
+				$this->isCached() || // even stale cache indicates it was cache worthy
+				$this->getMissesRecent() >= self::MISS_THRESHOLD // many misses
+			);
+		}
+
+		return $this->mCacheWorthy;
+	}
+}