181 lines
5.5 KiB
Python
181 lines
5.5 KiB
Python
from urllib.parse import urlsplit, urlunsplit
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from asgiref.local import Local
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from django.utils.encoding import iri_to_uri
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from django.utils.functional import lazy
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from django.utils.translation import override
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from .exceptions import NoReverseMatch, Resolver404
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from .resolvers import _get_cached_resolver, get_ns_resolver, get_resolver
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from .utils import get_callable
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# SCRIPT_NAME prefixes for each thread are stored here. If there's no entry for
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# the current thread (which is the only one we ever access), it is assumed to
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# be empty.
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_prefixes = Local()
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# Overridden URLconfs for each thread are stored here.
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_urlconfs = Local()
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def resolve(path, urlconf=None):
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if urlconf is None:
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urlconf = get_urlconf()
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return get_resolver(urlconf).resolve(path)
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def reverse(viewname, urlconf=None, args=None, kwargs=None, current_app=None):
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if urlconf is None:
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urlconf = get_urlconf()
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resolver = get_resolver(urlconf)
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args = args or []
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kwargs = kwargs or {}
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prefix = get_script_prefix()
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if not isinstance(viewname, str):
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view = viewname
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else:
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*path, view = viewname.split(':')
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if current_app:
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current_path = current_app.split(':')
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current_path.reverse()
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else:
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current_path = None
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resolved_path = []
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ns_pattern = ''
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ns_converters = {}
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for ns in path:
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current_ns = current_path.pop() if current_path else None
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# Lookup the name to see if it could be an app identifier.
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try:
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app_list = resolver.app_dict[ns]
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# Yes! Path part matches an app in the current Resolver.
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if current_ns and current_ns in app_list:
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# If we are reversing for a particular app, use that
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# namespace.
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ns = current_ns
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elif ns not in app_list:
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# The name isn't shared by one of the instances (i.e.,
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# the default) so pick the first instance as the default.
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ns = app_list[0]
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except KeyError:
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pass
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if ns != current_ns:
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current_path = None
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try:
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extra, resolver = resolver.namespace_dict[ns]
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resolved_path.append(ns)
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ns_pattern = ns_pattern + extra
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ns_converters.update(resolver.pattern.converters)
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except KeyError as key:
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if resolved_path:
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raise NoReverseMatch(
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"%s is not a registered namespace inside '%s'" %
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(key, ':'.join(resolved_path))
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)
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else:
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raise NoReverseMatch("%s is not a registered namespace" % key)
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if ns_pattern:
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resolver = get_ns_resolver(ns_pattern, resolver, tuple(ns_converters.items()))
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return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
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reverse_lazy = lazy(reverse, str)
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def clear_url_caches():
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get_callable.cache_clear()
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_get_cached_resolver.cache_clear()
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get_ns_resolver.cache_clear()
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def set_script_prefix(prefix):
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"""
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Set the script prefix for the current thread.
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"""
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if not prefix.endswith('/'):
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prefix += '/'
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_prefixes.value = prefix
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def get_script_prefix():
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"""
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Return the currently active script prefix. Useful for client code that
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wishes to construct their own URLs manually (although accessing the request
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instance is normally going to be a lot cleaner).
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"""
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return getattr(_prefixes, "value", '/')
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def clear_script_prefix():
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"""
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Unset the script prefix for the current thread.
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"""
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try:
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del _prefixes.value
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except AttributeError:
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pass
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def set_urlconf(urlconf_name):
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"""
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Set the URLconf for the current thread (overriding the default one in
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settings). If urlconf_name is None, revert back to the default.
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"""
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if urlconf_name:
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_urlconfs.value = urlconf_name
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else:
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if hasattr(_urlconfs, "value"):
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del _urlconfs.value
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def get_urlconf(default=None):
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"""
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Return the root URLconf to use for the current thread if it has been
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changed from the default one.
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"""
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return getattr(_urlconfs, "value", default)
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def is_valid_path(path, urlconf=None):
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"""
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Return True if the given path resolves against the default URL resolver,
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False otherwise. This is a convenience method to make working with "is
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this a match?" cases easier, avoiding try...except blocks.
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"""
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try:
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resolve(path, urlconf)
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return True
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except Resolver404:
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return False
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def translate_url(url, lang_code):
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"""
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Given a URL (absolute or relative), try to get its translated version in
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the `lang_code` language (either by i18n_patterns or by translated regex).
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Return the original URL if no translated version is found.
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"""
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parsed = urlsplit(url)
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try:
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match = resolve(parsed.path)
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except Resolver404:
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pass
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else:
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to_be_reversed = "%s:%s" % (match.namespace, match.url_name) if match.namespace else match.url_name
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with override(lang_code):
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try:
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url = reverse(to_be_reversed, args=match.args, kwargs=match.kwargs)
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except NoReverseMatch:
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pass
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else:
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url = urlunsplit((parsed.scheme, parsed.netloc, url, parsed.query, parsed.fragment))
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return url
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