Contacts: Move response caching to OC_Response

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/response.php b/lib/response.php
new file mode 100644
index 00000000000..c254ddd10e7
--- /dev/null
+++ b/lib/response.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright (c) 2011 Bart Visscher bartv@thisnet.nl
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+class OC_Response {
+	const STATUS_NOT_MODIFIED = 304;
+
+	static public function enableCaching() {
+		header('Cache-Control: cache');
+		header('Pragma: cache');
+	}
+
+	static public function setStatus($status) {
+		switch($status) {
+			case self::STATUS_NOT_MODIFIED:
+				$status = $status . ' Not Modified';
+				break;
+		}
+		header($_SERVER["SERVER_PROTOCOL"].' '.$status);
+	}
+
+	static public function setETagHeader($etag) {
+		if (empty($etag)) {
+			return;
+		}
+		self::enableCaching();
+		if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
+		    trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
+			self::setStatus(self::STATUS_NOT_MODIFIED);
+			exit;
+		}
+		header('ETag: '.$etag);
+	}
+
+	static public function setLastModifiedHeader($lastModified) {
+		if (empty($lastModified)) {
+			return;
+		}
+		if ($lastModified instanceof DateTime) {
+			$lastModified = $lastModified->format(DateTime::RFC2822);
+		}
+		self::enableCaching();
+		if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
+		    trim($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified) {
+			self::setStatus(self::STATUS_NOT_MODIFIED);
+			exit;
+		}
+		header('Last-Modified: '.$lastModified);
+	}
+}