diff options
| -rw-r--r-- | index.php | 2 | ||||
| -rw-r--r-- | lib/BridgeAbstract.php | 23 | ||||
| -rw-r--r-- | lib/FormatAbstract.php | 8 |
3 files changed, 33 insertions, 0 deletions
@@ -195,6 +195,7 @@ try { try { $bridge->setCache($cache); $bridge->setCacheTimeout($cache_timeout); + $bridge->dieIfNotModified(); $bridge->setDatas($params); } catch(Error $e) { http_response_code($e->getCode()); @@ -211,6 +212,7 @@ try { $format = Format::create($format); $format->setItems($bridge->getItems()); $format->setExtraInfos($bridge->getExtraInfos()); + $format->setLastModified($bridge->getCacheTime()); $format->display(); } catch(Error $e) { http_response_code($e->getCode()); diff --git a/lib/BridgeAbstract.php b/lib/BridgeAbstract.php index fb7456fd..95ef3572 100644 --- a/lib/BridgeAbstract.php +++ b/lib/BridgeAbstract.php @@ -292,4 +292,27 @@ abstract class BridgeAbstract implements BridgeInterface { public function getCacheTimeout(){ return isset($this->cacheTimeout) ? $this->cacheTimeout : static::CACHE_TIMEOUT; } + + public function getCacheTime(){ + return !is_null($this->cache) ? $this->cache->getTime() : false; + } + + public function dieIfNotModified(){ + if ((defined('DEBUG') && DEBUG === true)) return; // disabled in debug mode + + $if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false; + if (!$if_modified_since) return; // If-Modified-Since value is required + + $last_modified = $this->getCacheTime(); + if (!$last_modified) return; // did not detect cache time + + if (time() - $this->getCacheTimeout() > $last_modified) return; // cache timeout + + $last_modified = (gmdate('D, d M Y H:i:s ', $last_modified) . 'GMT'); + + if ($if_modified_since == $last_modified) { + header('HTTP/1.1 304 Not Modified'); + die(); + } + } } diff --git a/lib/FormatAbstract.php b/lib/FormatAbstract.php index db8d3dd4..d36b29d4 100644 --- a/lib/FormatAbstract.php +++ b/lib/FormatAbstract.php @@ -7,6 +7,7 @@ abstract class FormatAbstract implements FormatInterface { $contentType, $charset, $items, + $lastModified, $extraInfos; public function setCharset($charset){ @@ -27,11 +28,18 @@ abstract class FormatAbstract implements FormatInterface { return $this; } + public function setLastModified($lastModified){ + $this->lastModified = $lastModified; + } + protected function callContentType(){ header('Content-Type: ' . $this->contentType); } public function display(){ + if ($this->lastModified) { + header('Last-Modified: ' . gmdate('D, d M Y H:i:s ', $this->lastModified) . 'GMT'); + } echo $this->stringify(); return $this; |