Add support for Range requests

Author: acoburn

src/Model/BasicContainer.php

@@ -27,7 +27,7 @@ public function respond(Application $app, Request $request)
         $res = new Response();
         $res->headers->add($headers);
         $res->setLastModified($modifiedTime);
-        $res->setEtag($this->getEtag($responseFormat));
+        $res->setEtag($this->getEtag($responseFormat, $request->headers->get('range')));
 
         if (!$res->isNotModified($request)) {
             $subject = $request->getUri();
@@ -84,10 +84,11 @@ public function respond(Application $app, Request $request)
         return $res;
     }
 
-    private function getEtag($responseFormat)
+    private function getEtag($responseFormat, $range)
     {
         $mtime = filemtime($this->path);
-        return sha1($mtime . $this->path . $responseFormat);
+        $byteRange = $range ? $range : "";
+        return sha1($mtime . $this->path . $responseFormat . $byteRange);
     }
 
     private function useCompactJsonLd($accept)

src/Model/NonRDFSource.php

@@ -20,7 +20,7 @@ public function respond(Application $app, Request $request, $options = array())
         $res = new Response();
         $res->headers->add($this->getHeaders($contentDisposition));
         $res->setLastModified(\DateTime::createFromFormat('U', filemtime($this->path)));
-        $res->setEtag($this->getEtag());
+        $res->setEtag($this->getEtag($request->headers->get('range')));
         if (!$res->isNotModified($request)) {
             $digest = $this->wantDigest($request->headers->get('want-digest'));
             if ($digest) {
@@ -57,10 +57,11 @@ private function getHeaders($contentDisposition)
         return $headers;
     }
 
-    private function getEtag()
+    private function getEtag($range)
     {
         $mtime = filemtime($this->path);
         $size = filesize($this->path);
-        return sha1($mtime . $size);
+        $byteRange = $range ? $range : "";
+        return sha1($mtime . $size . $byteRange);
     }
 }

src/Model/RDFSource.php

@@ -19,7 +19,7 @@ public function respond(Application $app, Request $request)
         $res = new Response();
         $res->headers->add($this->getHeaders($responseMimeType));
         $res->setLastModified(\DateTime::createFromFormat('U', filemtime($this->path)));
-        $res->setEtag($this->getEtag($responseFormat));
+        $res->setEtag($this->getEtag($responseFormat, $request->headers->get('range')));
         if (!$res->isNotModified($request)) {
             $extParts = explode(".", $this->path);
             if (count($extParts) > 1) {
@@ -58,11 +58,12 @@ public function respond(Application $app, Request $request)
         return $res;
     }
 
-    private function getEtag($responseFormat)
+    private function getEtag($responseFormat, $range)
     {
         $mtime = filemtime($this->path);
         $size = filesize($this->path);
-        return sha1($mtime . $size . $responseFormat);
+        $byteRange = $range ? $range : "";
+        return sha1($mtime . $size . $responseFormat . $range);
     }
 
     private function canStream($responseFormat)