Garbled username when the username has non-ascii characters on Trac serving with mod_wsgi and mod_fcgid

[Jun Omae]

After logging in as joé to Trac which serves with mod_wsgi/mod_fcgid, logged in as joé is shown in the metanav. If Trac serves with tracd, logged in as joé is correctly shown.

Also, the username (via Request.check_modified) is used in ETag header from attachment view. The header value has garbled username. According to ​https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag#etag_value, ASCII strings should be used in the ETag. We should encode the header value (e.g. urlencode).

$ curl -s -D - -o /dev/null -H 'Cookie: trac_auth=c3a8d583f00d2818e3e442b0fb588f70' 'http://127.0.0.1:3000/trac/attachment/ticket/22/test.png'
HTTP/1.1 200 Ok
Date: Sun, 07 Jan 2024 03:51:37 GMT
Server: Apache/2.4.41 (Ubuntu) mod_wsgi/5.0.0 Python/3.11 SVN/1.13.0
ETag: W/"jo�/Sat, 06 Jan 2024 23:55:50 GMT/False"
Cache-Control: must-revalidate
Expires: Fri, 01 Jan 1999 00:00:00 GMT
Set-Cookie: trac_form_token=ee5889b2d87128f5977cce46; HttpOnly; Path=/trac
Transfer-Encoding: chunked
Content-Type: text/html;charset=utf-8

[Jun Omae]

According to ​Unicode Issues - PEP 3333 – Python Web Server Gateway Interface v1.0.1, values of the environ (e.g. REMOTE_USER) store str instance which decoded the bytes as latin-1 encoding. However, tracd stores str instance which decoded as utf-8 encoding. In other wsgi containers, latin-1 encoding is used according to the PEP 3333.

[Jun Omae]

Proposed changes in [f0d7bb9b/jomae.git].

[Jun Omae]

Fixed in [17789] and merged in [17790].