import itertools import json import os import re from urllib.parse import unquote 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 is_safe_url from django.utils.translation import ( LANGUAGE_SESSION_KEY, check_for_language, get_language, ) from django.utils.translation.trans_real import DjangoTranslation from django.views.generic import View LANGUAGE_QUERY_PARAMETER = 'language' 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 = request.POST.get('next', request.GET.get('next')) if ((next or not request.is_ajax()) and not is_safe_url(url=next, allowed_hosts={request.get_host()}, require_https=request.is_secure())): next = request.META.get('HTTP_REFERER') next = next and unquote(next) # HTTP_REFERER may be encoded. if not is_safe_url(url=next, allowed_hosts={request.get_host()}, require_https=request.is_secure()): next = '/' response = HttpResponseRedirect(next) if next 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: next_trans = translate_url(next, lang_code) if next_trans != next: response = HttpResponseRedirect(next_trans) if hasattr(request, 'session'): request.session[LANGUAGE_SESSION_KEY] = lang_code 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, ) 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 %} (function(globals) { var django = globals.django || (globals.django = {}); {% if plural %} django.pluralidx = function(n) { var 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 %} var newcatalog = {{ catalog_str }}; for (var key in newcatalog) { django.catalog[key] = newcatalog[key]; } {% endif %} if (!django.jsi18n_initialized) { django.gettext = function(msgid) { var value = django.catalog[msgid]; if (typeof(value) == 'undefined') { return msgid; } else { return (typeof(value) == 'string') ? value : value[0]; } }; django.ngettext = function(singular, plural, count) { var 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) { var value = django.gettext(context + '\x04' + msgid); if (value.indexOf('\x04') != -1) { value = msgid; } return value; }; django.npgettext = function(context, singular, plural, count) { var value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count); if (value.indexOf('\x04') != -1) { 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) { var 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; } }(this)); {% endautoescape %} """ 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 url() 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.groups()[0]) 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 = {} num_plurals = self._num_plurals catalog = {} trans_cat = self.translation._catalog trans_fallback_cat = self.translation._fallback._catalog if self.translation._fallback else {} seen_keys = set() for key, value in itertools.chain(trans_cat.items(), trans_fallback_cat.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) 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"') 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)