Source code for django.views.i18n
import json
import os
import re
from django.apps import apps
from django.conf import settings
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.template import Context, Engine
from django.urls import translate_url
from django.utils.formats import get_format
from django.utils.http import url_has_allowed_host_and_scheme
from django.utils.translation import check_for_language, get_language
from django.utils.translation.trans_real import DjangoTranslation
from django.views.generic import View
LANGUAGE_QUERY_PARAMETER = "language"
[docs]
def set_language(request):
"""
Redirect to a given URL while setting the chosen language in the session
(if enabled) and in a cookie. The URL and the language code need to be
specified in the request parameters.
Since this view changes how the user will see the rest of the site, it must
only be accessed as a POST request. If called as a GET request, it will
redirect to the page in the request (the 'next' parameter) without changing
any state.
"""
next_url = request.POST.get("next", request.GET.get("next"))
if (
next_url or request.accepts("text/html")
) and not url_has_allowed_host_and_scheme(
url=next_url,
allowed_hosts={request.get_host()},
require_https=request.is_secure(),
):
next_url = request.META.get("HTTP_REFERER")
if not url_has_allowed_host_and_scheme(
url=next_url,
allowed_hosts={request.get_host()},
require_https=request.is_secure(),
):
next_url = "/"
response = HttpResponseRedirect(next_url) if next_url else HttpResponse(status=204)
if request.method == "POST":
lang_code = request.POST.get(LANGUAGE_QUERY_PARAMETER)
if lang_code and check_for_language(lang_code):
if next_url:
next_trans = translate_url(next_url, lang_code)
if next_trans != next_url:
response = HttpResponseRedirect(next_trans)
response.set_cookie(
settings.LANGUAGE_COOKIE_NAME,
lang_code,
max_age=settings.LANGUAGE_COOKIE_AGE,
path=settings.LANGUAGE_COOKIE_PATH,
domain=settings.LANGUAGE_COOKIE_DOMAIN,
secure=settings.LANGUAGE_COOKIE_SECURE,
httponly=settings.LANGUAGE_COOKIE_HTTPONLY,
samesite=settings.LANGUAGE_COOKIE_SAMESITE,
)
return response
def get_formats():
"""Return all formats strings required for i18n to work."""
FORMAT_SETTINGS = (
"DATE_FORMAT",
"DATETIME_FORMAT",
"TIME_FORMAT",
"YEAR_MONTH_FORMAT",
"MONTH_DAY_FORMAT",
"SHORT_DATE_FORMAT",
"SHORT_DATETIME_FORMAT",
"FIRST_DAY_OF_WEEK",
"DECIMAL_SEPARATOR",
"THOUSAND_SEPARATOR",
"NUMBER_GROUPING",
"DATE_INPUT_FORMATS",
"TIME_INPUT_FORMATS",
"DATETIME_INPUT_FORMATS",
)
return {attr: get_format(attr) for attr in FORMAT_SETTINGS}
js_catalog_template = r"""
{% autoescape off %}
'use strict';
{
const globals = this;
const django = globals.django || (globals.django = {});
{% if plural %}
django.pluralidx = function(n) {
const v = {{ plural }};
if (typeof v === 'boolean') {
return v ? 1 : 0;
} else {
return v;
}
};
{% else %}
django.pluralidx = function(count) { return (count == 1) ? 0 : 1; };
{% endif %}
/* gettext library */
django.catalog = django.catalog || {};
{% if catalog_str %}
const newcatalog = {{ catalog_str }};
for (const key in newcatalog) {
django.catalog[key] = newcatalog[key];
}
{% endif %}
if (!django.jsi18n_initialized) {
django.gettext = function(msgid) {
const value = django.catalog[msgid];
if (typeof value === 'undefined') {
return msgid;
} else {
return (typeof value === 'string') ? value : value[0];
}
};
django.ngettext = function(singular, plural, count) {
const value = django.catalog[singular];
if (typeof value === 'undefined') {
return (count == 1) ? singular : plural;
} else {
return value.constructor === Array ? value[django.pluralidx(count)] : value;
}
};
django.gettext_noop = function(msgid) { return msgid; };
django.pgettext = function(context, msgid) {
let value = django.gettext(context + '\x04' + msgid);
if (value.includes('\x04')) {
value = msgid;
}
return value;
};
django.npgettext = function(context, singular, plural, count) {
let value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
if (value.includes('\x04')) {
value = django.ngettext(singular, plural, count);
}
return value;
};
django.interpolate = function(fmt, obj, named) {
if (named) {
return fmt.replace(/%\(\w+\)s/g, function(match){return String(obj[match.slice(2,-2)])});
} else {
return fmt.replace(/%s/g, function(match){return String(obj.shift())});
}
};
/* formatting library */
django.formats = {{ formats_str }};
django.get_format = function(format_type) {
const value = django.formats[format_type];
if (typeof value === 'undefined') {
return format_type;
} else {
return value;
}
};
/* add to global namespace */
globals.pluralidx = django.pluralidx;
globals.gettext = django.gettext;
globals.ngettext = django.ngettext;
globals.gettext_noop = django.gettext_noop;
globals.pgettext = django.pgettext;
globals.npgettext = django.npgettext;
globals.interpolate = django.interpolate;
globals.get_format = django.get_format;
django.jsi18n_initialized = true;
}
};
{% endautoescape %}
""" # NOQA
[docs]
class JavaScriptCatalog(View):
"""
Return the selected language catalog as a JavaScript library.
Receive the list of packages to check for translations in the `packages`
kwarg either from the extra dictionary passed to the path() function or as
a plus-sign delimited string from the request. Default is 'django.conf'.
You can override the gettext domain for this view, but usually you don't
want to do that as JavaScript messages go to the djangojs domain. This
might be needed if you deliver your JavaScript source from Django templates.
"""
domain = "djangojs"
packages = None
def get(self, request, *args, **kwargs):
locale = get_language()
domain = kwargs.get("domain", self.domain)
# If packages are not provided, default to all installed packages, as
# DjangoTranslation without localedirs harvests them all.
packages = kwargs.get("packages", "")
packages = packages.split("+") if packages else self.packages
paths = self.get_paths(packages) if packages else None
self.translation = DjangoTranslation(locale, domain=domain, localedirs=paths)
context = self.get_context_data(**kwargs)
return self.render_to_response(context)
def get_paths(self, packages):
allowable_packages = {
app_config.name: app_config for app_config in apps.get_app_configs()
}
app_configs = [
allowable_packages[p] for p in packages if p in allowable_packages
]
if len(app_configs) < len(packages):
excluded = [p for p in packages if p not in allowable_packages]
raise ValueError(
"Invalid package(s) provided to JavaScriptCatalog: %s"
% ",".join(excluded)
)
# paths of requested packages
return [os.path.join(app.path, "locale") for app in app_configs]
@property
def _num_plurals(self):
"""
Return the number of plurals for this catalog language, or 2 if no
plural string is available.
"""
match = re.search(r"nplurals=\s*(\d+)", self._plural_string or "")
if match:
return int(match[1])
return 2
@property
def _plural_string(self):
"""
Return the plural string (including nplurals) for this catalog language,
or None if no plural string is available.
"""
if "" in self.translation._catalog:
for line in self.translation._catalog[""].split("\n"):
if line.startswith("Plural-Forms:"):
return line.split(":", 1)[1].strip()
return None
def get_plural(self):
plural = self._plural_string
if plural is not None:
# This should be a compiled function of a typical plural-form:
# Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 :
# n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;
plural = [
el.strip()
for el in plural.split(";")
if el.strip().startswith("plural=")
][0].split("=", 1)[1]
return plural
def get_catalog(self):
pdict = {}
catalog = {}
translation = self.translation
seen_keys = set()
while True:
for key, value in translation._catalog.items():
if key == "" or key in seen_keys:
continue
if isinstance(key, str):
catalog[key] = value
elif isinstance(key, tuple):
msgid, cnt = key
pdict.setdefault(msgid, {})[cnt] = value
else:
raise TypeError(key)
seen_keys.add(key)
if translation._fallback:
translation = translation._fallback
else:
break
num_plurals = self._num_plurals
for k, v in pdict.items():
catalog[k] = [v.get(i, "") for i in range(num_plurals)]
return catalog
def get_context_data(self, **kwargs):
return {
"catalog": self.get_catalog(),
"formats": get_formats(),
"plural": self.get_plural(),
}
def render_to_response(self, context, **response_kwargs):
def indent(s):
return s.replace("\n", "\n ")
template = Engine().from_string(js_catalog_template)
context["catalog_str"] = (
indent(json.dumps(context["catalog"], sort_keys=True, indent=2))
if context["catalog"]
else None
)
context["formats_str"] = indent(
json.dumps(context["formats"], sort_keys=True, indent=2)
)
return HttpResponse(
template.render(Context(context)), 'text/javascript; charset="utf-8"'
)
[docs]
class JSONCatalog(JavaScriptCatalog):
"""
Return the selected language catalog as a JSON object.
Receive the same parameters as JavaScriptCatalog and return a response
with a JSON object of the following format:
{
"catalog": {
# Translations catalog
},
"formats": {
# Language formats for date, time, etc.
},
"plural": '...' # Expression for plural forms, or null.
}
"""
def render_to_response(self, context, **response_kwargs):
return JsonResponse(context)
