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"""
Provide urlresolver functions that return fully qualified URLs or view names
"""
from django.urls import NoReverseMatch
from django.urls import reverse as django_reverse
from django.utils.functional import lazy
from rest_framework.settings import api_settings
from rest_framework.utils.urls import replace_query_param
def preserve_builtin_query_params(url, request=None):
"""
Given an incoming request, and an outgoing URL representation,
append the value of any built-in query parameters.
"""
if request is None:
return url
overrides = [
api_settings.URL_FORMAT_OVERRIDE,
]
for param in overrides:
if param and (param in request.GET):
value = request.GET[param]
url = replace_query_param(url, param, value)
return url
def reverse(viewname, args=None, kwargs=None, request=None, format=None, **extra):
"""
If versioning is being used then we pass any `reverse` calls through
to the versioning scheme instance, so that the resulting URL
can be modified if needed.
"""
scheme = getattr(request, 'versioning_scheme', None)
if scheme is not None:
try:
url = scheme.reverse(viewname, args, kwargs, request, format, **extra)
except NoReverseMatch:
# In case the versioning scheme reversal fails, fallback to the
# default implementation
url = _reverse(viewname, args, kwargs, request, format, **extra)
else:
url = _reverse(viewname, args, kwargs, request, format, **extra)
return preserve_builtin_query_params(url, request)
def _reverse(viewname, args=None, kwargs=None, request=None, format=None, **extra):
"""
Same as `django.urls.reverse`, but optionally takes a request
and returns a fully qualified URL, using the request to get the base URL.
"""
if format is not None:
kwargs = kwargs or {}
kwargs['format'] = format
url = django_reverse(viewname, args=args, kwargs=kwargs, **extra)
if request:
return request.build_absolute_uri(url)
return url
reverse_lazy = lazy(reverse, str)
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