only check if the key file exists to decide if it is an encrypted file or not.

This solves problems with external storage which doesn't support fseek

apps/files_encryption/lib/keymanager.php

@@ -172,14 +172,13 @@ class Keymanager {
 	/**
 	 * @brief retrieve keyfile for an encrypted file
 	 * @param \OC_FilesystemView $view
-	 * @param $userId
 	 * @param $filePath
 	 * @internal param \OCA\Encryption\file $string name
 	 * @return string file key or false
 	 * @note The keyfile returned is asymmetrically encrypted. Decryption
 	 * of the keyfile must be performed by client code
 	 */
-	public static function getFileKey(\OC_FilesystemView $view, $userId, $filePath) {
+	public static function getFileKey(\OC_FilesystemView $view, $filePath) {
 
 		$util = new Util($view, \OCP\User::getUser());
 

apps/files_encryption/lib/stream.php

@@ -250,7 +250,7 @@ class Stream {
 
 		// Fetch and decrypt keyfile
 		// Fetch existing keyfile
-		$this->encKeyfile = Keymanager::getFileKey($this->rootView, $this->userId, $this->relPath);
+		$this->encKeyfile = Keymanager::getFileKey($this->rootView, $this->relPath);
 
 		// If a keyfile already exists
 		if ($this->encKeyfile) {

apps/files_encryption/lib/util.php

@@ -367,7 +367,7 @@ class Util {
 							// scanning every file like this
 							// will eat server resources :(
 							if (
-								Keymanager::getFileKey($this->view, $this->userId, $relPath)
+								Keymanager::getFileKey($this->view, $relPath)
 								&& $isEncryptedPath
 							) {
 
@@ -472,22 +472,15 @@ class Util {
 	 */
 	public function isEncryptedPath($path) {
 
-		// Disable encryption proxy so data retrieved is in its
-		// original form
-		$proxyStatus = \OC_FileProxy::$enabled;
-		\OC_FileProxy::$enabled = false;
+		$relPath = Helper::stripUserFilesPath($path);
 
-		// we only need 24 byte from the last chunk
-		$data = '';
-		$handle = $this->view->fopen($path, 'r');
-		if (is_resource($handle) && !fseek($handle, -24, SEEK_END)) {
-			$data = fgets($handle);
-		}
+		$fileKey = Keymanager::getFileKey($this->view, $relPath);
 
-		// re-enable proxy
-		\OC_FileProxy::$enabled = $proxyStatus;
+		if ($fileKey === false) {
+			return false;
+		}
 
-		return Crypt::isCatfileContent($data);
+		return true;
 
 	}
 
@@ -1059,7 +1052,7 @@ class Util {
 	private function decryptKeyfile($filePath, $privateKey) {
 
 		// Get the encrypted keyfile
-		$encKeyfile = Keymanager::getFileKey($this->view, $this->userId, $filePath);
+		$encKeyfile = Keymanager::getFileKey($this->view, $filePath);
 
 		// The file has a shareKey and must use it for decryption
 		$shareKey = Keymanager::getShareKey($this->view, $this->userId, $filePath);

apps/files_encryption/tests/crypt.php

@@ -176,7 +176,7 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 		$this->assertNotEquals($this->dataShort, $retreivedCryptedFile);
 
 		// Get the encrypted keyfile
-		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $this->userId, $filename);
+		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $filename);
 
 		// Attempt to fetch the user's shareKey
 		$shareKey = Encryption\Keymanager::getShareKey($this->view, $this->userId, $filename);
@@ -250,7 +250,7 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
 		//print_r($e);
 
 		// Get the encrypted keyfile
-		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $this->userId, $filename);
+		$encKeyfile = Encryption\Keymanager::getFileKey($this->view, $filename);
 
 		// Attempt to fetch the user's shareKey
 		$shareKey = Encryption\Keymanager::getShareKey($this->view, $this->userId, $filename);