codestyle fixes (dereferer env parsing)

src/hub/settings/base.py

@@ -102,6 +102,26 @@ def gen_secret_key():
     return ''.join([random.SystemRandom().choice(SECRET_CHARSET) for i in range(50)])
 
 
+# regex to match arbitrary hostnames
+REGEX_HOST = re.compile(r'([\w\d-]+\.)+\w+(:\d+)?')
+
+
+# helper function for parsing DEREFERER_*LIST (allow hostname only, regex and https:// prefixed strings)
+def _handle_hostpattern_list(target: list, items: list):
+    for item in items:
+        if item.startswith('/') and item.endswith('/'):
+            try:
+                target.append(re.compile('https://' + item[1:-1]))
+            except re.error as err:
+                print('WARNING: failed to parse regex pattern "', item, "', ignoring it: ", err, sep='')
+        elif item.startswith('https://') or item.startswith('http://'):
+            target.append(item)
+        elif REGEX_HOST.fullmatch(item):
+            target.append('https://' + item)
+        else:
+            print('WARNING: failed to parse pattern "', item, "' (expected hostname, url or slash-enclosed regex), skipping it", sep='')
+
+
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
@@ -528,22 +548,6 @@ PLAINUI_CONFERENCE = env('PLAINUI_CONFERENCE')
 # If you modify this on a non-empty database you should run `manage.py rerender_markdown` to update cashed markdown that contains old urls.
 PLAINUI_DEREFERER_URL = env('PLAINUI_DEREFERER_URL')
 
-# helper function for parsing DEREFERER_*LIST (allow hostname only, regex and https:// prefixed strings)
-re_host = re.compile('([\w\d-]+\.)+\w+(:\d+)?$')
-def _handle_hostpattern_list(target: list, items: list):
-    for item in items:
-        if item.startswith('/') and item.endswith('/'):
-            try:
-                target.append(re.compile('https://' + item[1:-1]))
-            except re.error as err:
-                print('WARNING: failed to parse regex pattern "', item, "', ignoring it: ", err, sep='')
-        elif item.startswith('https://') or item.startswith('http://'):
-            target.append(item)
-        elif re_host.match(item):
-            target.append('https://' + item)
-        else:
-            print('WARNING: failed to parse pattern "', item, "' (expected hostname, url or slash-enclosed regex), skipping it", sep='')
-
 # URI patterns that are auto-allowed (never get dereferrer'd)
 # Only looks at schema and host/port, so for example for the url https://rc3.world:4321/some/where/ the entry should be `'https://rc3.world'`.
 # Can also be a regex, for example re.compile(r'https://.*\.rc3\.world')