refactor: added custom routing for profiles

- installed a regex conveter to werkzeug to support regular expresions in routes
- added a website route rule to match all profiles

community/routing.py

@@ -0,0 +1,25 @@
+"""Utilities for making custom routing.
+"""
+
+from werkzeug.routing import BaseConverter, Map
+from werkzeug.datastructures import ImmutableDict
+
+class RegexConverter(BaseConverter):
+    """werkzeug converter that supports custom regular expression.
+
+    The `install_regex_converter` function must be called before using
+    regex converter in rules.
+    """
+    def __init__(self, map, regex):
+        super().__init__(map)
+        self.regex = regex
+
+def install_regex_converter():
+    """Installs the RegexConvetor to the default converters supported by werkzeug.
+
+    This allows specifing rules using regex. For example:
+
+        /profiles/<regex("[a-z0-9]{5,}"):username>
+    """
+    default_converters = dict(Map.default_converters, regex=RegexConverter)
+    Map.default_converters = ImmutableDict(default_converters)