Check if a file is encrypted before sharing (encrypted files cannot be shared)

apps/files_sharing/ajax/share.php

@@ -9,10 +9,11 @@ $sources = explode(';', $_POST['sources']);
 $uid_shared_with = $_POST['uid_shared_with'];
 $permissions = $_POST['permissions'];
 foreach ($sources as $source) {
+	$file = OC_FileCache::get($source);
 	$path = ltrim($source, '/'); 
 	$source = $userDirectory.$source;
 	// Check if the file exists or if the file is being reshared
-	if ($source && (OC_FILESYSTEM::file_exists($path) && OC_FILESYSTEM::is_readable($path) || OC_Share::getSource($source))) {
+	if ($source && $file['encrypted'] == false && (OC_FILESYSTEM::file_exists($path) && OC_FILESYSTEM::is_readable($path) || OC_Share::getSource($source))) {
 		try {
 			$shared = new OC_Share($source, $uid_shared_with, $permissions);
 			// If this is a private link, return the token
@@ -26,8 +27,12 @@ foreach ($sources as $source) {
 			OCP\JSON::error(array('data' => array('message' => $exception->getMessage())));
 		}
 	} else {
-		OCP\Util::writeLog('files_sharing', 'File does not exist or is not readable :'.$source, OCP\Util::ERROR);
-		OCP\JSON::error(array('data' => array('message' => 'File does not exist or is not readable')));
+		if ($file['encrypted'] == true) {
+			OCP\JSON::error(array('data' => array('message' => 'Encrypted files cannot be shared')));
+		} else {
+			OCP\Util::writeLog('files_sharing', 'File does not exist or is not readable :'.$source, OCP\Util::ERROR);
+			OCP\JSON::error(array('data' => array('message' => 'File does not exist or is not readable')));
+		}
 	}
 }