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-rw-r--r--application/controllers/Main.php30
1 files changed, 26 insertions, 4 deletions
diff --git a/application/controllers/Main.php b/application/controllers/Main.php
index c0aded275..b0f88753e 100644
--- a/application/controllers/Main.php
+++ b/application/controllers/Main.php
@@ -37,6 +37,28 @@ class Main extends MY_Controller {
}
}
+ private function _handle_etag($etag)
+ {
+ $etag = strtolower($etag);
+ $modified = true;
+
+ if(isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
+ $oldtag = trim(strtolower($_SERVER['HTTP_IF_NONE_MATCH']), '"');
+ if($oldtag == $etag) {
+ $modified = false;
+ } else {
+ $modified = true;
+ }
+ }
+
+ header('Etag: "'.$etag.'"');
+
+ if (!$modified) {
+ header("HTTP/1.1 304 Not Modified");
+ exit();
+ }
+ }
+
/**
* Generate a page title of the format "Multipaste - $filename, $filename, … (N more)".
* This mainly helps in IRC channels to quickly determine what is in a multipaste.
@@ -121,7 +143,7 @@ class Main extends MY_Controller {
break;
case "qr":
- handle_etag($etag);
+ $this->_handle_etag($etag);
header("Content-disposition: inline; filename=\"".$id."_qr.png\"\n");
header("Content-Type: image/png\n");
$qr = new \Endroid\QrCode\QrCode();
@@ -156,7 +178,7 @@ class Main extends MY_Controller {
// user wants the plain file
if ($lexer == 'plain') {
assert(count($files) == 1);
- handle_etag($etag);
+ $this->_handle_etag($etag);
$filedata = $files[0];
$filepath = $this->mfile->file($filedata["data_id"]);
@@ -199,7 +221,7 @@ class Main extends MY_Controller {
foreach (array("X-WebKit-CSP", "X-Content-Security-Policy", "Content-Security-Policy") as $header_name) {
header("$header_name: default-src 'none'; img-src *; media-src *; font-src *; style-src 'unsafe-inline' *; script-src 'none'; object-src *; frame-src 'none'; ");
}
- handle_etag($etag);
+ $this->_handle_etag($etag);
$this->ddownload->serveFile($file, $filedata["filename"], $filedata["mimetype"]);
exit();
} else {
@@ -472,7 +494,7 @@ class Main extends MY_Controller {
}
$etag = "$id-thumb";
- handle_etag($etag);
+ $this->_handle_etag($etag);
$thumb_size = 150;
$cache_timeout = 60*60*24*30; # 1 month