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from django.conf.urls import include, url from rest_framework.compat import ( URLResolver, get_regex_pattern, is_route_pattern, path, register_converter ) from rest_framework.settings import api_settings def _get_format_path_converter(suffix_kwarg, allowed): if allowed: if len(allowed) == 1: allowed_pattern = allowed[0] else: allowed_pattern = '(?:%s)' % '|'.join(allowed) suffix_pattern = r"\.%s/?" % allowed_pattern else: suffix_pattern = r"\.[a-z0-9]+/?" class FormatSuffixConverter: regex = suffix_pattern def to_python(self, value): return value.strip('./') def to_url(self, value): return '.' + value + '/' converter_name = 'drf_format_suffix' if allowed: converter_name += '_' + '_'.join(allowed) return converter_name, FormatSuffixConverter def apply_suffix_patterns(urlpatterns, suffix_pattern, suffix_required, suffix_route=None): ret = [] for urlpattern in urlpatterns: if isinstance(urlpattern, URLResolver): # Set of included URL patterns regex = get_regex_pattern(urlpattern) namespace = urlpattern.namespace app_name = urlpattern.app_name kwargs = urlpattern.default_kwargs # Add in the included patterns, after applying the suffixes patterns = apply_suffix_patterns(urlpattern.url_patterns, suffix_pattern, suffix_required, suffix_route) # if the original pattern was a RoutePattern we need to preserve it if is_route_pattern(urlpattern): assert path is not None route = str(urlpattern.pattern) new_pattern = path(route, include((patterns, app_name), namespace), kwargs) else: new_pattern = url(regex, include((patterns, app_name), namespace), kwargs) ret.append(new_pattern) else: # Regular URL pattern regex = get_regex_pattern(urlpattern).rstrip('$').rstrip('/') + suffix_pattern view = urlpattern.callback kwargs = urlpattern.default_args name = urlpattern.name # Add in both the existing and the new urlpattern if not suffix_required: ret.append(urlpattern) # if the original pattern was a RoutePattern we need to preserve it if is_route_pattern(urlpattern): assert path is not None assert suffix_route is not None route = str(urlpattern.pattern).rstrip('$').rstrip('/') + suffix_route new_pattern = path(route, view, kwargs, name) else: new_pattern = url(regex, view, kwargs, name) ret.append(new_pattern) return ret def format_suffix_patterns(urlpatterns, suffix_required=False, allowed=None): """ Supplement existing urlpatterns with corresponding patterns that also include a '.format' suffix. Retains urlpattern ordering. urlpatterns: A list of URL patterns. suffix_required: If `True`, only suffixed URLs will be generated, and non-suffixed URLs will not be used. Defaults to `False`. allowed: An optional tuple/list of allowed suffixes. eg ['json', 'api'] Defaults to `None`, which allows any suffix. """ suffix_kwarg = api_settings.FORMAT_SUFFIX_KWARG if allowed: if len(allowed) == 1: allowed_pattern = allowed[0] else: allowed_pattern = '(%s)' % '|'.join(allowed) suffix_pattern = r'\.(?P<%s>%s)/?$' % (suffix_kwarg, allowed_pattern) else: suffix_pattern = r'\.(?P<%s>[a-z0-9]+)/?$' % suffix_kwarg if path and register_converter: converter_name, suffix_converter = _get_format_path_converter(suffix_kwarg, allowed) register_converter(suffix_converter, converter_name) suffix_route = '<%s:%s>' % (converter_name, suffix_kwarg) else: suffix_route = None return apply_suffix_patterns(urlpatterns, suffix_pattern, suffix_required, suffix_route)