From 89e4c42bbd9124087ddd2d13649fd2aaab736949 Mon Sep 17 00:00:00 2001
From: Katherine Bailey <katherine@katbailey.net>
Date: Thu, 30 Aug 2012 22:04:04 -0700
Subject: [PATCH] Fixing the update number in system.install

---
 .../system/lib/Drupal/system/FileDownload.php | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 core/modules/system/lib/Drupal/system/FileDownload.php

diff --git a/core/modules/system/lib/Drupal/system/FileDownload.php b/core/modules/system/lib/Drupal/system/FileDownload.php
new file mode 100644
index 0000000000..b55872c14f
--- /dev/null
+++ b/core/modules/system/lib/Drupal/system/FileDownload.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\system;
+
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+/**
+ * Controller class for private file downloads.
+ */
+class FileDownload {
+
+  /**
+  * Page callback: Handles private file transfers.
+  *
+  * Call modules that implement hook_file_download() to find out if a file is
+  * accessible and what headers it should be transferred with. If one or more
+  * modules returned headers the download will start with the returned headers.
+  * If a module returns -1 an AccessDeniedHttpException will be thrown.
+  * If the file exists but no modules responded an AccessDeniedHttpException will
+  * be thrown.If the file does not exist a NotFoundHttpException will be thrown.
+  *
+  * @see hook_file_download()
+  */
+  public function download() {
+    // Merge remaining path arguments into relative file path.
+    $args = func_get_args();
+    $scheme = array_shift($args);
+    $target = implode('/', $args);
+    $uri = $scheme . '://' . $target;
+    if (file_stream_wrapper_valid_scheme($scheme) && file_exists($uri)) {
+      // Let other modules provide headers and controls access to the file.
+      // module_invoke_all() uses array_merge_recursive() which merges header
+      // values into a new array. To avoid that and allow modules to override
+      // headers instead, use array_merge() to merge the returned arrays.
+      $headers = array();
+      foreach (module_implements('file_download') as $module) {
+        $function = $module . '_file_download';
+        $result = $function($uri);
+        if ($result == -1) {
+          throw new AccessDeniedHttpException();
+        }
+        if (isset($result) && is_array($result)) {
+          $headers = array_merge($headers, $result);
+        }
+      }
+      if (count($headers)) {
+        return file_transfer($uri, $headers);
+      }
+      throw new AccessDeniedHttpException();
+    }
+    throw new NotFoundHttpException();
+  }
+}
-- 
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