Fix metafile.makeinfo trying to decode pieces

* The use of unicode_literals causes join to decode pieces if 'b' prefix not used.
 * Added test.
 * Fixed session_id keyerror when running with tests.

deluge/metafile.py

@@ -20,6 +20,7 @@ from hashlib import sha1 as sha
 
 import deluge.component as component
 from deluge.bencode import bencode
+from deluge.common import utf8_encode_structure
 from deluge.event import CreateTorrentProgressEvent
 
 log = logging.getLogger(__name__)
@@ -69,11 +70,14 @@ def make_meta_file(path, url, piece_length, progress=None, title=None, comment=N
         f = target
 
     if progress is None:
-        session_id = component.get('RPCServer').get_session_id()
-        if not session_id:
-            progress = dummy
+        progress = dummy
+        try:
+            session_id = component.get('RPCServer').get_session_id()
+        except KeyError:
+            pass
         else:
-            progress = RemoteFileProgress(component.get('RPCServer').get_session_id())
+            if session_id:
+                progress = RemoteFileProgress(session_id)
 
     info = makeinfo(path, piece_length, progress, name, content_type, private)
 
@@ -110,7 +114,7 @@ def make_meta_file(path, url, piece_length, progress=None, title=None, comment=N
 
     data['encoding'] = 'UTF-8'
 
-    h.write(bencode(data))
+    h.write(bencode(utf8_encode_structure(data)))
     h.close()
 
 
@@ -173,7 +177,7 @@ def makeinfo(path, piece_length, progress, name=None, content_type=None, private
         if not name:
             name = os.path.split(path)[1]
 
-        return {'pieces': ''.join(pieces),
+        return {'pieces': b''.join(pieces),
                 'piece length': piece_length,
                 'files': fs,
                 'name': name.encode('utf8'),
@@ -199,12 +203,12 @@ def makeinfo(path, piece_length, progress, name=None, content_type=None, private
         h.close()
         name = os.path.split(path)[1].encode('utf8')
         if content_type is not None:
-            return {'pieces': ''.join(pieces),
+            return {'pieces': b''.join(pieces),
                     'piece length': piece_length, 'length': size,
                     'name': name,
                     'content_type': content_type,
                     'private': private}
-        return {'pieces': ''.join(pieces),
+        return {'pieces': b''.join(pieces),
                 'piece length': piece_length, 'length': size,
                 'name': name,
                 'private': private}

deluge/tests/test_metafile.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Deluge and is licensed under GNU General Public License 3.0, or later, with
+# the additional special exception to link portions of this program with the OpenSSL library.
+# See LICENSE for more details.
+#
+
+from __future__ import unicode_literals
+
+import os
+import tempfile
+
+from twisted.trial import unittest
+
+from deluge import metafile
+
+
+def check_torrent(filename):
+    # Test loading with libtorrent to make sure it's valid
+    from deluge._libtorrent import lt
+    lt.torrent_info(filename)
+
+    # Test loading with our internal TorrentInfo class
+    from deluge.ui.common import TorrentInfo
+    TorrentInfo(filename)
+
+
+class MetafileTestCase(unittest.TestCase):
+    def test_save_multifile(self):
+        # Create a temporary folder for torrent creation
+        tmp_path = tempfile.mkdtemp()
+        with open(os.path.join(tmp_path, 'file_A'), 'wb') as tmp_file:
+            tmp_file.write('a' * (312 * 1024))
+        with open(os.path.join(tmp_path, 'file_B'), 'wb') as tmp_file:
+            tmp_file.write('b' * (2354 * 1024))
+        with open(os.path.join(tmp_path, 'file_C'), 'wb') as tmp_file:
+            tmp_file.write('c' * (11 * 1024))
+
+        tmp_fd, tmp_file = tempfile.mkstemp('.torrent')
+        metafile.make_meta_file(tmp_path, '', 32768, target=tmp_file)
+
+        check_torrent(tmp_file)
+
+        os.remove(os.path.join(tmp_path, 'file_A'))
+        os.remove(os.path.join(tmp_path, 'file_B'))
+        os.remove(os.path.join(tmp_path, 'file_C'))
+        os.rmdir(tmp_path)
+        os.close(tmp_fd)
+        os.remove(tmp_file)
+
+    def test_save_singlefile(self):
+        tmp_path = tempfile.mkstemp('testdata')[1]
+        with open(tmp_path, 'wb') as tmp_file:
+            tmp_file.write('a' * (2314 * 1024))
+
+        tmp_fd, tmp_file = tempfile.mkstemp('.torrent')
+        metafile.make_meta_file(tmp_path, '', 32768, target=tmp_file)
+
+        check_torrent(tmp_file)
+
+        os.remove(tmp_path)
+        os.close(tmp_fd)
+        os.remove(tmp_file)