fix(dav): allow uploading of files with long filenamesfix/path-length

A filename must be less or equal 255 characters, but when adding the
`.part` and `.ocfiletransfer` extensions we might overflow this limit.
So we should also use filename hashes for uploading when the file has a
long filename, similar like when we are uploading to the user storage
directly.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

2 files changed, 38 insertions, 3 deletions

diff --git a/apps/dav/lib/Connector/Sabre/File.php b/apps/dav/lib/Connector/Sabre/File.php
index 777abc1daa2..045b9d7e784 100644
--- a/apps/dav/lib/Connector/Sabre/File.php
+++ b/apps/dav/lib/Connector/Sabre/File.php
@@ -129,8 +129,9 @@ class File extends Node implements IFile {
 		$view = Filesystem::getView();
 
 		if ($needsPartFile) {
+			$transferId = \rand();
 			// mark file as partial while uploading (ignored by the scanner)
-			$partFilePath = $this->getPartFileBasePath($this->path) . '.ocTransferId' . rand() . '.part';
+			$partFilePath = $this->getPartFileBasePath($this->path) . '.ocTransferId' . $transferId . '.part';
 
 			if (!$view->isCreatable($partFilePath) && $view->isUpdatable($this->path)) {
 				$needsPartFile = false;
@@ -377,9 +378,14 @@ class File extends Node implements IFile {
 	private function getPartFileBasePath($path) {
 		$partFileInStorage = Server::get(IConfig::class)->getSystemValue('part_file_in_storage', true);
 		if ($partFileInStorage) {
-			return $path;
+			$filename = basename($path);
+			// hash does not need to be secure but fast and semi unique
+			$hashedFilename = hash('xxh128', $filename);
+			return substr($path, 0, strlen($path) - strlen($filename)) . $hashedFilename;
 		} else {
-			return md5($path); // will place it in the root of the view with a unique name
+			// will place the .part file in the users root directory
+			// therefor we need to make the name (semi) unique - hash does not need to be secure but fast.
+			return hash('xxh128', $path);
 		}
 	}
 
diff --git a/build/integration/dav_features/dav-v2.feature b/build/integration/dav_features/dav-v2.feature
index a9e62c8ac9e..9eae9a1b5fd 100644
--- a/build/integration/dav_features/dav-v2.feature
+++ b/build/integration/dav_features/dav-v2.feature
@@ -108,6 +108,24 @@ Feature: dav-v2
 		When User "user0" uploads file "data/textfile.txt" to "/testquota/asdf.txt"
 		Then the HTTP status code should be "201"
 
+	Scenario: Uploading a file with very long filename
+		Given using new dav path
+		And As an "admin"
+		And user "user0" exists
+		And user "user0" has a quota of "10 MB"
+		And As an "user0"
+		When User "user0" uploads file "data/textfile.txt" to "/long-filename-with-250-characters-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.txt"
+		Then the HTTP status code should be "201"
+
+	Scenario: Uploading a file with a too long filename
+		Given using new dav path
+		And As an "admin"
+		And user "user0" exists
+		And user "user0" has a quota of "10 MB"
+		And As an "user0"
+		When User "user0" uploads file "data/textfile.txt" to "/long-filename-with-251-characters-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.txt"
+		Then the HTTP status code should be "400"
+
 	Scenario: Create a search query on image
 		Given using new dav path
 		And As an "admin"
@@ -132,3 +150,14 @@ Feature: dav-v2
 		Then Favorite search should work
 		And the single response should contain a property "{http://owncloud.org/ns}favorite" with value "1"
 
+	Scenario: Create a search query on favorite
+		Given using new dav path
+		And As an "admin"
+		And user "user0" exists
+		And As an "user0"
+		When User "user0" uploads file "data/green-square-256.png" to "/fav_image.png"
+		Then Favorite search should work
+		And the response should be empty
+		When user "user0" favorites element "/fav_image.png"
+		Then Favorite search should work
+		And the single response should contain a property "{http://owncloud.org/ns}favorite" with value "1"