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from __future__ import unicode_literals
from django.conf.urls import url, include
from django.core.urlresolvers import RegexURLResolver
from rest_framework.settings import api_settings
def apply_suffix_patterns(urlpatterns, suffix_pattern, suffix_required):
ret = []
for urlpattern in urlpatterns:
if isinstance(urlpattern, RegexURLResolver):
# Set of included URL patterns
regex = urlpattern.regex.pattern
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)
ret.append(url(regex, include(patterns, namespace, app_name), kwargs))
else:
# Regular URL pattern
regex = urlpattern.regex.pattern.rstrip('$') + suffix_pattern
view = urlpattern._callback or urlpattern._callback_str
kwargs = urlpattern.default_args
name = urlpattern.name
# Add in both the existing and the new urlpattern
if not suffix_required:
ret.append(urlpattern)
ret.append(url(regex, view, kwargs, name))
return ret
def format_suffix_patterns(urlpatterns, suffix_required=False, allowed=None):
"""
Supplement existing urlpatterns with corresponding patterns that also
include a '.format' suffix. Retains urlpattern ordering.
urlpatterns:
A list of URL patterns.
suffix_required:
If `True`, only suffixed URLs will be generated, and non-suffixed
URLs will not be used. Defaults to `False`.
allowed:
An optional tuple/list of allowed suffixes. eg ['json', 'api']
Defaults to `None`, which allows any suffix.
"""
suffix_kwarg = api_settings.FORMAT_SUFFIX_KWARG
if allowed:
if len(allowed) == 1:
allowed_pattern = allowed[0]
else:
allowed_pattern = '(%s)' % '|'.join(allowed)
suffix_pattern = r'\.(?P<%s>%s)$' % (suffix_kwarg, allowed_pattern)
else:
suffix_pattern = r'\.(?P<%s>[a-z0-9]+)$' % suffix_kwarg
return apply_suffix_patterns(urlpatterns, suffix_pattern, suffix_required)
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