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"""
Copied from raven-python.
Despite being called "legacy" in some places this resolver is very much still
in use.
"""
import re
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from django.urls.resolvers import URLResolver
from typing import Dict
from typing import List
from typing import Optional
from django.urls.resolvers import URLPattern
from typing import Tuple
from typing import Union
from re import Pattern
from django import VERSION as DJANGO_VERSION
if DJANGO_VERSION >= (2, 0):
from django.urls.resolvers import RoutePattern
else:
RoutePattern = None
try:
from django.urls import get_resolver
except ImportError:
from django.core.urlresolvers import get_resolver
def get_regex(resolver_or_pattern):
# type: (Union[URLPattern, URLResolver]) -> Pattern[str]
"""Utility method for django's deprecated resolver.regex"""
try:
regex = resolver_or_pattern.regex
except AttributeError:
regex = resolver_or_pattern.pattern.regex
return regex
class RavenResolver:
_new_style_group_matcher = re.compile(
r"<(?:([^>:]+):)?([^>]+)>"
) # https://github.com/django/django/blob/21382e2743d06efbf5623e7c9b6dccf2a325669b/django/urls/resolvers.py#L245-L247
_optional_group_matcher = re.compile(r"\(\?\:([^\)]+)\)")
_named_group_matcher = re.compile(r"\(\?P<(\w+)>[^\)]+\)+")
_non_named_group_matcher = re.compile(r"\([^\)]+\)")
# [foo|bar|baz]
_either_option_matcher = re.compile(r"\[([^\]]+)\|([^\]]+)\]")
_camel_re = re.compile(r"([A-Z]+)([a-z])")
_cache = {} # type: Dict[URLPattern, str]
def _simplify(self, pattern):
# type: (Union[URLPattern, URLResolver]) -> str
r"""
Clean up urlpattern regexes into something readable by humans:
From:
> "^(?P<sport_slug>\w+)/athletes/(?P<athlete_slug>\w+)/$"
To:
> "{sport_slug}/athletes/{athlete_slug}/"
"""
# "new-style" path patterns can be parsed directly without turning them
# into regexes first
if (
RoutePattern is not None
and hasattr(pattern, "pattern")
and isinstance(pattern.pattern, RoutePattern)
):
return self._new_style_group_matcher.sub(
lambda m: "{%s}" % m.group(2), str(pattern.pattern._route)
)
result = get_regex(pattern).pattern
# remove optional params
# TODO(dcramer): it'd be nice to change these into [%s] but it currently
# conflicts with the other rules because we're doing regexp matches
# rather than parsing tokens
result = self._optional_group_matcher.sub(lambda m: "%s" % m.group(1), result)
# handle named groups first
result = self._named_group_matcher.sub(lambda m: "{%s}" % m.group(1), result)
# handle non-named groups
result = self._non_named_group_matcher.sub("{var}", result)
# handle optional params
result = self._either_option_matcher.sub(lambda m: m.group(1), result)
# clean up any outstanding regex-y characters.
result = (
result.replace("^", "")
.replace("$", "")
.replace("?", "")
.replace("\\A", "")
.replace("\\Z", "")
.replace("//", "/")
.replace("\\", "")
)
return result
def _resolve(self, resolver, path, parents=None):
# type: (URLResolver, str, Optional[List[URLResolver]]) -> Optional[str]
match = get_regex(resolver).search(path) # Django < 2.0
if not match:
return None
if parents is None:
parents = [resolver]
elif resolver not in parents:
parents = parents + [resolver]
new_path = path[match.end() :]
for pattern in resolver.url_patterns:
# this is an include()
if not pattern.callback:
match_ = self._resolve(pattern, new_path, parents)
if match_:
return match_
continue
elif not get_regex(pattern).search(new_path):
continue
try:
return self._cache[pattern]
except KeyError:
pass
prefix = "".join(self._simplify(p) for p in parents)
result = prefix + self._simplify(pattern)
if not result.startswith("/"):
result = "/" + result
self._cache[pattern] = result
return result
return None
def resolve(
self,
path, # type: str
urlconf=None, # type: Union[None, Tuple[URLPattern, URLPattern, URLResolver], Tuple[URLPattern]]
):
# type: (...) -> Optional[str]
resolver = get_resolver(urlconf)
match = self._resolve(resolver, path)
return match
LEGACY_RESOLVER = RavenResolver()
|
