324 lines
10 KiB
Python
324 lines
10 KiB
Python
import importlib
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import itertools
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import json
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import os
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from django import http
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from django.apps import apps
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from django.conf import settings
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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 import six
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from django.utils._os import upath
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from django.utils.encoding import smart_text
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from django.utils.formats import get_format, get_format_modules
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from django.utils.http import is_safe_url
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from django.utils.translation import (
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LANGUAGE_SESSION_KEY, check_for_language, get_language, to_locale,
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)
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from django.utils.translation.trans_real import DjangoTranslation
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DEFAULT_PACKAGES = ['django.conf']
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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
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session or 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 = request.POST.get('next', request.GET.get('next'))
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if (next or not request.is_ajax()) and not is_safe_url(url=next, host=request.get_host()):
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next = request.META.get('HTTP_REFERER')
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if not is_safe_url(url=next, host=request.get_host()):
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next = '/'
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response = http.HttpResponseRedirect(next) if next else http.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:
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next_trans = translate_url(next, lang_code)
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if next_trans != next:
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response = http.HttpResponseRedirect(next_trans)
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if hasattr(request, 'session'):
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request.session[LANGUAGE_SESSION_KEY] = lang_code
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else:
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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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)
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return response
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def get_formats():
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"""
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Returns all formats strings required for i18n to work
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"""
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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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result = {}
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for module in [settings] + get_format_modules(reverse=True):
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for attr in FORMAT_SETTINGS:
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result[attr] = get_format(attr)
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formats = {}
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for k, v in result.items():
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if isinstance(v, (six.string_types, int)):
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formats[k] = smart_text(v)
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elif isinstance(v, (tuple, list)):
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formats[k] = [smart_text(value) for value in v]
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return formats
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js_catalog_template = r"""
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{% autoescape off %}
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(function(globals) {
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var django = globals.django || (globals.django = {});
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{% if plural %}
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django.pluralidx = function(n) {
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var 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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var newcatalog = {{ catalog_str }};
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for (var 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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var 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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var 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[django.pluralidx(count)];
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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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var value = django.gettext(context + '\x04' + msgid);
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if (value.indexOf('\x04') != -1) {
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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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var value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
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if (value.indexOf('\x04') != -1) {
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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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var 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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}(this));
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{% endautoescape %}
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"""
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def render_javascript_catalog(catalog=None, plural=None):
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template = Engine().from_string(js_catalog_template)
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def indent(s):
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return s.replace('\n', '\n ')
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context = Context({
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'catalog_str': indent(json.dumps(
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catalog, sort_keys=True, indent=2)) if catalog else None,
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'formats_str': indent(json.dumps(
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get_formats(), sort_keys=True, indent=2)),
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'plural': plural,
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})
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return http.HttpResponse(template.render(context), 'text/javascript')
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def get_javascript_catalog(locale, domain, packages):
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app_configs = apps.get_app_configs()
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allowable_packages = set(app_config.name for app_config in app_configs)
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allowable_packages.update(DEFAULT_PACKAGES)
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packages = [p for p in packages if p in allowable_packages]
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paths = []
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# paths of requested packages
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for package in packages:
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p = importlib.import_module(package)
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path = os.path.join(os.path.dirname(upath(p.__file__)), 'locale')
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paths.append(path)
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trans = DjangoTranslation(locale, domain=domain, localedirs=paths)
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trans_cat = trans._catalog
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plural = None
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if '' in trans_cat:
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for line in trans_cat[''].split('\n'):
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if line.startswith('Plural-Forms:'):
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plural = line.split(':', 1)[1].strip()
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if plural is not None:
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# this should actually 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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pdict = {}
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maxcnts = {}
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catalog = {}
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trans_fallback_cat = trans._fallback._catalog if trans._fallback else {}
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for key, value in itertools.chain(six.iteritems(trans_cat), six.iteritems(trans_fallback_cat)):
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if key == '' or key in catalog:
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continue
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if isinstance(key, six.string_types):
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catalog[key] = value
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elif isinstance(key, tuple):
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msgid = key[0]
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cnt = key[1]
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maxcnts[msgid] = max(cnt, maxcnts.get(msgid, 0))
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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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for k, v in pdict.items():
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catalog[k] = [v.get(i, '') for i in range(maxcnts[msgid] + 1)]
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return catalog, plural
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def _get_locale(request):
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language = request.GET.get(LANGUAGE_QUERY_PARAMETER)
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if not (language and check_for_language(language)):
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language = get_language()
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return to_locale(language)
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def _parse_packages(packages):
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if packages is None:
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packages = list(DEFAULT_PACKAGES)
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elif isinstance(packages, six.string_types):
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packages = packages.split('+')
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return packages
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def null_javascript_catalog(request, domain=None, packages=None):
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"""
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Returns "identity" versions of the JavaScript i18n functions -- i.e.,
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versions that don't actually do anything.
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"""
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return render_javascript_catalog()
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def javascript_catalog(request, domain='djangojs', packages=None):
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"""
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Returns the selected language catalog as a javascript library.
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Receives the list of packages to check for translations in the
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packages parameter either from an infodict or as a +-delimited
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string from the request. Default is 'django.conf'.
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Additionally you can override the gettext domain for this view,
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but usually you don't want to do that, as JavaScript messages
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go to the djangojs domain. But this might be needed if you
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deliver your JavaScript source from Django templates.
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"""
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locale = _get_locale(request)
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packages = _parse_packages(packages)
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catalog, plural = get_javascript_catalog(locale, domain, packages)
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return render_javascript_catalog(catalog, plural)
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def json_catalog(request, domain='djangojs', packages=None):
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"""
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Return the selected language catalog as a JSON object.
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Receives the same parameters as javascript_catalog(), but returns
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a response 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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locale = _get_locale(request)
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packages = _parse_packages(packages)
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catalog, plural = get_javascript_catalog(locale, domain, packages)
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data = {
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'catalog': catalog,
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'formats': get_formats(),
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'plural': plural,
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}
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return http.JsonResponse(data)
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