1 files changed, 94 insertions, 0 deletions
diff --git a/inc/Cache/CacheRenderer.php b/inc/Cache/CacheRenderer.php
new file mode 100644
index 000000000..e8a28c309
--- /dev/null
+++ b/inc/Cache/CacheRenderer.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace dokuwiki\Cache;
+
+/**
+ * Caching of data of renderer
+ */
+class CacheRenderer extends CacheParser
+{
+
+    /**
+     * method contains cache use decision logic
+     *
+     * @return bool               see useCache()
+     */
+    public function makeDefaultCacheDecision()
+    {
+        global $conf;
+
+        if (!parent::makeDefaultCacheDecision()) {
+            return false;
+        }
+
+        if (!isset($this->page)) {
+            return true;
+        }
+
+        // meta cache older than file it depends on?
+        if ($this->_time < @filemtime(metaFN($this->page, '.meta'))) {
+            return false;
+        }
+
+        // check current link existence is consistent with cache version
+        // first check the purgefile
+        // - if the cache is more recent than the purgefile we know no links can have been updated
+        if ($this->_time >= @filemtime($conf['cachedir'] . '/purgefile')) {
+            return true;
+        }
+
+        // for wiki pages, check metadata dependencies
+        $metadata = p_get_metadata($this->page);
+
+        if (!isset($metadata['relation']['references']) ||
+            empty($metadata['relation']['references'])) {
+            return true;
+        }
+
+        foreach ($metadata['relation']['references'] as $id => $exists) {
+            if ($exists != page_exists($id, '', false)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    protected function addDependencies()
+    {
+        global $conf;
+
+        // default renderer cache file 'age' is dependent on 'cachetime' setting, two special values:
+        //    -1 : do not cache (should not be overridden)
+        //    0  : cache never expires (can be overridden) - no need to set depends['age']
+        if ($conf['cachetime'] == -1) {
+            $this->_nocache = true;
+            return;
+        } elseif ($conf['cachetime'] > 0) {
+            $this->depends['age'] = isset($this->depends['age']) ?
+                min($this->depends['age'], $conf['cachetime']) : $conf['cachetime'];
+        }
+
+        // renderer cache file dependencies ...
+        $files = array(
+            DOKU_INC . 'inc/parser/' . $this->mode . '.php',       // ... the renderer
+        );
+
+        // page implies metadata and possibly some other dependencies
+        if (isset($this->page)) {
+
+            // for xhtml this will render the metadata if needed
+            $valid = p_get_metadata($this->page, 'date valid');
+            if (!empty($valid['age'])) {
+                $this->depends['age'] = isset($this->depends['age']) ?
+                    min($this->depends['age'], $valid['age']) : $valid['age'];
+            }
+        }
+
+        $this->depends['files'] = !empty($this->depends['files']) ?
+            array_merge($files, $this->depends['files']) :
+            $files;
+
+        parent::addDependencies();
+    }
+}