Add OC_Response::setContentLengthHeader() for Apache PHP SAPI workaround.

Do not send Content-Length headers with a value larger than PHP_INT_MAX
(2147483647) on Apache PHP SAPI 32-bit. PHP will eat them and send 2147483647
instead.

When X-Sendfile is enabled, Apache will send a correct Content-Length header,
even for files larger than 2147483647 bytes. When X-Sendfile is not enabled,
ownCloud will not send a Content-Length header. This prevents progress bars
from working, but allows the actual transfer to work properly.

3 files changed, 31 insertions, 2 deletions

diff --git a/lib/private/files.php b/lib/private/files.php
index b7df99c7d70..be08fd37d60 100644
--- a/lib/private/files.php
+++ b/lib/private/files.php
@@ -48,7 +48,7 @@ class OC_Files {
 			$filesize = \OC\Files\Filesystem::filesize($filename);
 			header('Content-Type: '.\OC_Helper::getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename)));
 			if ($filesize > -1) {
-				header("Content-Length: ".$filesize);
+				OC_Response::setContentLengthHeader($filesize);
 			}
 		}
 	}
diff --git a/lib/private/response.php b/lib/private/response.php
index 2bec5e3decd..7cd362ecdf3 100644
--- a/lib/private/response.php
+++ b/lib/private/response.php
@@ -172,6 +172,27 @@ class OC_Response {
 	}
 
 	/**
+	 * Sets the content length header (with possible workarounds)
+	 * @param string|int|float $length Length to be sent
+	 */
+	static public function setContentLengthHeader($length) {
+		if (PHP_INT_SIZE === 4) {
+			if ($length > PHP_INT_MAX && stripos(PHP_SAPI, 'apache') === 0) {
+				// Apache PHP SAPI casts Content-Length headers to PHP integers.
+				// This enforces a limit of PHP_INT_MAX (2147483647 on 32-bit
+				// platforms). So, if the length is greater than PHP_INT_MAX,
+				// we just do not send a Content-Length header to prevent
+				// bodies from being received incompletely.
+				return;
+			}
+			// Convert signed integer or float to unsigned base-10 string.
+			$lfh = new \OC\LargeFileHelper;
+			$length = $lfh->formatUnsignedInteger($length);
+		}
+		header('Content-Length: '.$length);
+	}
+
+	/**
 	* Send file as response, checking and setting caching headers
 	* @param string $filepath of file to send
 	*/
@@ -181,7 +202,7 @@ class OC_Response {
 			self::setLastModifiedHeader(filemtime($filepath));
 			self::setETagHeader(md5_file($filepath));
 
-			header('Content-Length: '.filesize($filepath));
+			self::setContentLengthHeader(filesize($filepath));
 			fpassthru($fp);
 		}
 		else {
diff --git a/lib/public/response.php b/lib/public/response.php
index 24d3c81d628..c32eb4a05e0 100644
--- a/lib/public/response.php
+++ b/lib/public/response.php
@@ -64,6 +64,14 @@ class Response {
 	}
 
 	/**
+	 * Sets the content length header (with possible workarounds)
+	 * @param string|int|float $length Length to be sent
+	 */
+	static public function setContentLengthHeader($length) {
+		\OC_Response::setContentLengthHeader($length);
+	}
+
+	/**
 	 * Disable browser caching
 	 * @see enableCaching with cache_time = 0
 	 */