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