[#3204|Core] Fix unicode get_name unicode error

The recent change to torrent.get_name does not handle non-ascii paths
on Python 2.

- Add a decode_bytes to resolve the issue.
- Add tests.
- Refactor to reduce nesting.

deluge/core/torrent.py

@@ -933,23 +933,18 @@ class Torrent(object):
             str: the name of the torrent.
 
         """
-        if not self.options['name']:
-            # Use the top-level folder as torrent name.
-            if self.has_metadata:
-                handle_name = (
-                    self.torrent_info.file_at(0)
-                    .path.replace('\\', '/', 1)
-                    .split('/', 1)[0]
-                )
-            else:
-                handle_name = self.handle.name()
+        if self.options['name']:
+            return self.options['name']
 
-            if handle_name:
-                name = decode_bytes(handle_name)
-            else:
-                name = self.torrent_id
+        if self.has_metadata:
+            # Use the top-level folder as torrent name.
+            filename = decode_bytes(self.torrent_info.file_at(0).path)
+            name = filename.replace('\\', '/', 1).split('/', 1)[0]
         else:
-            name = self.options['name']
+            name = decode_bytes(self.handle.name())
+
+        if not name:
+            name = self.torrent_id
 
         return name
 

deluge/tests/data/unicode_file.torrent

@@ -0,0 +1 @@
+d13:creation datei1540200743e8:encoding5:UTF-84:infod6:lengthi0e4:name35:সুকুমার রায়.mkv12:piece lengthi32768e6:pieces0:7:privatei0eee

deluge/tests/test_torrent.py

@@ -297,3 +297,10 @@ class TorrentTestCase(BaseTestCase):
         result = self.torrent.get_eta()
         self.assertEqual(result, 100)
         self.assertIsInstance(result, int)
+
+    def test_get_name_unicode(self):
+        """Test retrieving a unicode torrent name from libtorrent."""
+        atp = self.get_torrent_atp('unicode_file.torrent')
+        handle = self.session.add_torrent(atp)
+        self.torrent = Torrent(handle, {})
+        self.assertEqual(self.torrent.get_name(), 'সুকুমার রায়.mkv')