From b36dd8b71fb8751b07ef98443d739d0b1cda9c7d Mon Sep 17 00:00:00 2001
From: Robin Appelman <robin@icewind.nl>
Date: Thu, 28 Sep 2017 14:22:42 +0200
Subject: [PATCH] Fallback to filename based detection if the remote dav server
 doesn't know the mimetype

Signed-off-by: Robin Appelman <robin@icewind.nl>
---
 .../tests/Storage/WebdavTest.php              | 13 +++++++++-
 lib/private/Files/Storage/DAV.php             | 26 ++++++++++++-------
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/apps/files_external/tests/Storage/WebdavTest.php b/apps/files_external/tests/Storage/WebdavTest.php
index 1e518e23b7..b007ded266 100644
--- a/apps/files_external/tests/Storage/WebdavTest.php
+++ b/apps/files_external/tests/Storage/WebdavTest.php
@@ -28,6 +28,7 @@
 namespace OCA\Files_External\Tests\Storage;
 
 use \OC\Files\Storage\DAV;
+use OC\Files\Type\Detection;
 
 /**
  * Class WebdavTest
@@ -43,7 +44,7 @@ class WebdavTest extends \Test\Files\Storage\Storage {
 
 		$id = $this->getUniqueID();
 		$config = include('files_external/tests/config.webdav.php');
-		if ( ! is_array($config) or !$config['run']) {
+		if (!is_array($config) or !$config['run']) {
 			$this->markTestSkipped('WebDAV backend not configured');
 		}
 		if (isset($config['wait'])) {
@@ -61,4 +62,14 @@ class WebdavTest extends \Test\Files\Storage\Storage {
 
 		parent::tearDown();
 	}
+
+	public function testMimetypeFallback() {
+		$this->instance->file_put_contents('foo.bar', 'asd');
+
+		/** @var Detection $mimeDetector */
+		$mimeDetector = \OC::$server->getMimeTypeDetector();
+		$mimeDetector->registerType('bar', 'application/x-bar');
+
+		$this->assertEquals('application/x-bar', $this->instance->getMimeType('foo.bar'));
+	}
 }
diff --git a/lib/private/Files/Storage/DAV.php b/lib/private/Files/Storage/DAV.php
index 223f270bc4..be23021d8f 100644
--- a/lib/private/Files/Storage/DAV.php
+++ b/lib/private/Files/Storage/DAV.php
@@ -146,7 +146,7 @@ class DAV extends Common {
 		}
 
 		$proxy = \OC::$server->getConfig()->getSystemValue('proxy', '');
-		if($proxy !== '') {
+		if ($proxy !== '') {
 			$settings['proxy'] = $proxy;
 		}
 
@@ -343,11 +343,11 @@ class DAV extends Common {
 			case 'rb':
 				try {
 					$response = $this->httpClientService
-							->newClient()
-							->get($this->createBaseUri() . $this->encodePath($path), [
-									'auth' => [$this->user, $this->password],
-									'stream' => true
-							]);
+						->newClient()
+						->get($this->createBaseUri() . $this->encodePath($path), [
+							'auth' => [$this->user, $this->password],
+							'stream' => true
+						]);
 				} catch (RequestException $e) {
 					if ($e->getResponse() instanceof ResponseInterface
 						&& $e->getResponse()->getStatusCode() === 404) {
@@ -590,6 +590,15 @@ class DAV extends Common {
 
 	/** {@inheritdoc} */
 	public function getMimeType($path) {
+		$remoteMimetype = $this->getMimeTypeFromRemote($path);
+		if ($remoteMimetype === 'application/octet-stream') {
+			return \OC::$server->getMimeTypeDetector()->detectPath($path);
+		} else {
+			return $remoteMimetype;
+		}
+	}
+
+	public function getMimeTypeFromRemote($path) {
 		try {
 			$response = $this->propfind($path);
 			if ($response === false) {
@@ -606,12 +615,11 @@ class DAV extends Common {
 			} elseif (isset($response['{DAV:}getcontenttype'])) {
 				return $response['{DAV:}getcontenttype'];
 			} else {
-				return false;
+				return 'application/octet-stream';
 			}
 		} catch (\Exception $e) {
-			$this->convertException($e, $path);
+			return false;
 		}
-		return false;
 	}
 
 	/**