From 8011209a182e95375a36bbb9e21436d3e099e9a4 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Fri, 6 Jan 2017 20:16:16 +0100
Subject: [PATCH] [HttpFoundation] Add File\Stream for size-unknown
 BinaryFileResponse

---
 .../HttpFoundation/BinaryFileResponse.php     | 18 ++++++------
 .../Component/HttpFoundation/CHANGELOG.md     |  2 ++
 .../Component/HttpFoundation/File/Stream.php  | 28 +++++++++++++++++++
 .../Tests/BinaryFileResponseTest.php          | 11 ++++++++
 4 files changed, 51 insertions(+), 8 deletions(-)
 create mode 100644 src/Symfony/Component/HttpFoundation/File/Stream.php

diff --git a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
index 825c78fedeb30..65f1529207e9f 100644
--- a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
+++ b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
@@ -186,13 +186,6 @@ public function setContentDisposition($disposition, $filename = '', $filenameFal
      */
     public function prepare(Request $request)
     {
-        $this->headers->set('Content-Length', $this->file->getSize());
-
-        if (!$this->headers->has('Accept-Ranges')) {
-            // Only accept ranges on safe HTTP methods
-            $this->headers->set('Accept-Ranges', $request->isMethodSafe(false) ? 'bytes' : 'none');
-        }
-
         if (!$this->headers->has('Content-Type')) {
             $this->headers->set('Content-Type', $this->file->getMimeType() ?: 'application/octet-stream');
         }
@@ -206,6 +199,16 @@ public function prepare(Request $request)
         $this->offset = 0;
         $this->maxlen = -1;
 
+        if (false === $fileSize = $this->file->getSize()) {
+            return $this;
+        }
+        $this->headers->set('Content-Length', $fileSize);
+
+        if (!$this->headers->has('Accept-Ranges')) {
+            // Only accept ranges on safe HTTP methods
+            $this->headers->set('Accept-Ranges', $request->isMethodSafe(false) ? 'bytes' : 'none');
+        }
+
         if (self::$trustXSendfileTypeHeader && $request->headers->has('X-Sendfile-Type')) {
             // Use X-Sendfile, do not send any content.
             $type = $request->headers->get('X-Sendfile-Type');
@@ -237,7 +240,6 @@ public function prepare(Request $request)
             // Process the range headers.
             if (!$request->headers->has('If-Range') || $this->hasValidIfRangeHeader($request->headers->get('If-Range'))) {
                 $range = $request->headers->get('Range');
-                $fileSize = $this->file->getSize();
 
                 list($start, $end) = explode('-', substr($range, 6), 2) + array(0);
 
diff --git a/src/Symfony/Component/HttpFoundation/CHANGELOG.md b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
index 2ac7204a5f494..9acffbbe7d342 100644
--- a/src/Symfony/Component/HttpFoundation/CHANGELOG.md
+++ b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
@@ -4,6 +4,8 @@ CHANGELOG
 3.3.0
 -----
 
+ * added `File\Stream`, to be passed to `BinaryFileResponse` when the size of the served file is unknown,
+   disabling `Range` and `Content-Length` handling, switching to chunked encoding instead
  * added the `Cookie::fromString()` method that allows to create a cookie from a
    raw header string
 
diff --git a/src/Symfony/Component/HttpFoundation/File/Stream.php b/src/Symfony/Component/HttpFoundation/File/Stream.php
new file mode 100644
index 0000000000000..69ae74c110bb8
--- /dev/null
+++ b/src/Symfony/Component/HttpFoundation/File/Stream.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\File;
+
+/**
+ * A PHP stream of unknown size.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class Stream extends File
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        return false;
+    }
+}
diff --git a/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
index e4607201a2151..89e078ca2a935 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Tests;
 
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
+use Symfony\Component\HttpFoundation\File\Stream;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
 use Symfony\Component\HttpFoundation\Tests\File\FakeFile;
@@ -97,6 +98,7 @@ public function testRequests($requestRange, $offset, $length, $responseRange)
 
         $this->assertEquals(206, $response->getStatusCode());
         $this->assertEquals($responseRange, $response->headers->get('Content-Range'));
+        $this->assertSame($length, $response->headers->get('Content-Length'));
     }
 
     /**
@@ -315,6 +317,15 @@ public function getSampleXAccelMappings()
         );
     }
 
+    public function testStream()
+    {
+        $request = Request::create('/');
+        $response = new BinaryFileResponse(new Stream(__DIR__.'/../README.md'), 200, array('Content-Type' => 'text/plain'));
+        $response->prepare($request);
+
+        $this->assertNull($response->headers->get('Content-Length'));
+    }
+
     protected function provideResponse()
     {
         return new BinaryFileResponse(__DIR__.'/../README.md', 200, array('Content-Type' => 'application/octet-stream'));