From bfd00d26081b3a7a035d22ac6a90af6d2bce3b64 Mon Sep 17 00:00:00 2001
From: Tristan <tristan@thedevstack.de>
Date: Mon, 13 Jan 2025 21:44:01 +0100
Subject: [PATCH] avoids caching 'maven-metadata.xml*' and '*-SNAPSHOT*',
 avoids delivering already stored files of the same

---
 .htaccess        |  4 +++-
 src/mvncache.php | 59 ++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/.htaccess b/.htaccess
index 894b08a..a6e423d 100644
--- a/.htaccess
+++ b/.htaccess
@@ -1,3 +1,5 @@
 RewriteEngine On
-RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-f [OR]
+RewriteCond %{REQUEST_FILENAME} =maven-metadata.xml [OR]
+RewriteCond %{REQUEST_URI} -SNAPSHOT
 RewriteRule ^.*$ src/mvncache.php [L]
diff --git a/src/mvncache.php b/src/mvncache.php
index a3cfa7c..6b8ebd4 100644
--- a/src/mvncache.php
+++ b/src/mvncache.php
@@ -26,6 +26,25 @@ foreach ($config['mavenBaseUrls'] as $mvnBaseUrl) {
   if ($found) {
     $filesize = @stream_copy_to_stream($src, $tempFile);
     $found = 0 < $filesize;
+    $metaData = @stream_get_meta_data($src);
+    $headers = [];
+    $headerNames = [
+      'Content-Type',
+      'Content-Length',
+      'ETag',
+      'Last-Modified',
+    ];
+    
+    if (isset($metaData) && array_key_exists('wrapper_data', $metaData)) {
+      foreach ($metaData['wrapper_data'] as $header) {
+        foreach ($headerNames as $headername) {
+          if (stripos($header, $headername) === 0) {
+            $headerValue = trim(substr($header, strlen($headername) + 1)); // +1 to remove the colon
+            $headers[$headername] = $headerValue;
+          }
+        }
+      }
+    }
   }
   if ($found) {
     trigger_error("Artifact found at $srcUrl", E_USER_NOTICE);
@@ -39,20 +58,36 @@ if (!$found) {
   trigger_error("Artifact NOT found at any source", E_USER_WARNING);
   sendHttpReturnCodeAndMessage(404, 'Not found');
 } else {
-  //echo $localFolder."<br>";
-  if (!is_dir($localFolder)) {
-    mkdir($localFolder, 0770, true);
-  }
-  $dstPath = $baseLocalFolder.$requestedArtifact;
-  //echo $dstPath;
-  $dst = fopen($dstPath, 'w');
+  // Rest temp file pointer
   fseek($tempFile, 0);
-  stream_copy_to_stream($tempFile, $dst);
-  if (is_file($dstPath)) {
-    chmod($dstPath, 0660);
-    header('Location: '.getServerProtocol().'://'.getRequestHostname().$_SERVER["REQUEST_URI"]);
+
+  if (preg_match('/maven-metadata.xml/', $requestedArtifact) || preg_match('/-SNAPSHOT/', $requestedArtifact)) {
+    trigger_error("Found artifact not to cache: ".$requestedArtifact, E_USER_NOTICE);
+    foreach ($headers as $header => $value) {
+      if (is_array($value)) {
+        $value = implode(', ', $value);
+      }
+      header($header.': '.$value);
+    }
+
+    stream_copy_to_stream($tempFile, fopen('php://output', 'w'));
   } else {
-    header('HTTP/1.0 404 Not Found');
+    trigger_error("Found artifact to cache: ".$requestedArtifact, E_USER_NOTICE);
+    //echo $localFolder."<br>";
+    if (!is_dir($localFolder)) {
+      mkdir($localFolder, 0770, true);
+    }
+    $dstPath = $baseLocalFolder.$requestedArtifact;
+    //echo $dstPath;
+    $dst = fopen($dstPath, 'w');
+
+    stream_copy_to_stream($tempFile, $dst);
+    if (is_file($dstPath)) {
+      chmod($dstPath, 0660);
+      header('Location: '.getServerProtocol().'://'.getRequestHostname().$_SERVER["REQUEST_URI"]);
+    } else {
+      header('HTTP/1.0 404 Not Found');
+    }
   }
 }
 ?>