Fix for Ubuntu python-pywebview bug; add SIGUSR1 documentation.

See #242.

Author: simonrob

README.md

@@ -115,6 +115,7 @@ This option overrides the proxy's default behaviour, which varies by platform (s
 
 - `--debug` enables debug mode, printing more verbose output to the log as [discussed below](#troubleshooting).
 This argument is identical to enabling debug mode from the proxy's menu bar icon.
+If needed, debug mode can also be toggled at runtime by sending the signal `SIGUSR1` (e.g.: `pkill -SIGUSR1 -f emailproxy`).
 
 ### Advanced configuration<a id="advanced-configuration"></a>
 The [example configuration file](https://github.com/simonrob/email-oauth2-proxy/blob/main/emailproxy.config) contains further documentation for various additional features of the proxy, including catch-all (wildcard) accounts, locally-encrypted connections and advanced Office 365 OAuth 2.0 flows.

emailproxy.py

@@ -6,7 +6,7 @@
 __author__ = 'Simon Robinson'
 __copyright__ = 'Copyright (c) 2024 Simon Robinson'
 __license__ = 'Apache 2.0'
-__version__ = '2024-05-22'  # ISO 8601 (YYYY-MM-DD)
+__version__ = '2024-05-23'  # ISO 8601 (YYYY-MM-DD)
 __package_version__ = '.'.join([str(int(i)) for i in __version__.split('-')])  # for pyproject.toml usage only
 
 import abc
@@ -2836,8 +2836,10 @@ def create_authorisation_window(self, request):
 
         # pywebview 3.6+ moved window events to a separate namespace in a non-backwards-compatible way
         # noinspection PyDeprecation
-        if pkg_resources.parse_version(
-                pkg_resources.get_distribution('pywebview').version) < pkg_resources.parse_version('3.6'):
+        pywebview_version = pkg_resources.parse_version(pkg_resources.get_distribution('pywebview').version)
+        # the version zero check is due to a bug in the Ubuntu 22.04 python-pywebview package - see GitHub #242
+        # noinspection PyDeprecation
+        if pkg_resources.parse_version('0') < pywebview_version < pkg_resources.parse_version('3.6'):
             # noinspection PyUnresolvedReferences
             authorisation_window.loaded += self.authorisation_window_loaded
         else: