Python error with boxes in TRAC 1.6

[clemens]

WikiExtrasPlugin has an problem with TRAC 1.6.

I have been using the great WikiExtrasPlugin under TRAC 1.4 for many years. Now after upgrading to TRAC 1.6 it does not run anymore. Might be a problem with the "boxes" component (boxes.py).

I am running the current version "1.3.2dev" i.e. revision r18475 of the plugin which is marked as "compatible with Python 3". My TRAC is the current 1.6 release, running under Linux (Debian 12) with Python 3.11.

Error message is logged as follows:

Trac[main] ERROR: [127.0.0.1] Internal Server Error: <RequestWithSession "GET '/wikiextras/dynamicboxes.css'">, referrer 'http://localhost:8000/first/'
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/dist-packages/trac/web/main.py", line 609, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python3.11/dist-packages/trac/web/main.py", line 301, in dispatch
    raise e
  File "/usr/local/lib/python3.11/dist-packages/trac/web/main.py", line 247, in dispatch
    resp = chosen_handler.process_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/tracwikiextras/boxes.py", line 144, in process_request
    req.send(csstext, 'text/css', status=200)
  File "/usr/local/lib/python3.11/dist-packages/trac/web/api.py", line 875, in send
    self._send(content, content_type, status)
  File "/usr/local/lib/python3.11/dist-packages/trac/web/api.py", line 1011, in _send
    self.write(content)
  File "/usr/local/lib/python3.11/dist-packages/trac/web/api.py", line 971, in write
    raise ValueError("Can't send str content")
ValueError: Can't send str content

Please note the boxes.py in above error message. I found out that disabling the "boxes" component in WikiExtrasPlugin in trac.ini make the problem disappear. Hence I believe that there seems to be a problem with the "boxes" component.

[components]
...
tracwikiextras.phrases.aboutwikiphrases = enabled
tracwikiextras.phrases.phrases = enabled
tracwikiextras.boxes.aboutwikiboxes = disabled
tracwikiextras.boxes.boxes = enabled <<<<<<< "disabled" makes the problem go away
tracwikiextras.color.color = enabled
tracwikiextras.entities.entities = disabled
tracwikiextras.icons.aboutwikiicons = disabled
tracwikiextras.icons.icons = disabled
tracwikiextras.icons.showicons = disabled
tracwikiextras.icons.smileys = disabled
tracwikiextras.symbols.symbols = disabled
tracwikiextras.unc_paths.uncpathlink = disabled

[Jun Omae]

Try the following patch:

tracwikiextras/boxes.py

@@ -141 +141 @@
         else:
             csstext += '.wiki-toc { width: auto !important; }\n'
 
+        if not isinstance(csstext, bytes):
+            csstext = csstext.encode('utf-8')
         req.send(csstext, 'text/css', status=200)
 
         return None

[clemens]

Replying to Jun Omae:

The patch works. The error is gone. Good!

(Sorry for late reply. Currently I cannot receive e-mail notifications about ticket changes from Trac-Hacks. See my question in the mailing list...)

Clemens