Python django.utils.translation 模块，check_for_language() 实例源码

def change_locale(request):
    """
    Redirect to a given url while changing the locale in the path
    The url and the locale code need to be specified in the
    request parameters.
    """
    next = request.REQUEST.get('next', None)
    if not next:
        referrer = request.META.get('HTTP_REFERER', None)
        if referrer:
            next = urlsplit(referrer)[2]
    if not next:
        next = '/'
    _, path = utils.strip_path(next)
    if request.method == 'POST':
        locale = request.POST.get('locale', None)
        if locale and check_for_language(locale):
            if localeurl_settings.USE_SESSION:
                request.session['django_language'] = locale
            path = utils.locale_path(path, locale)

    response = http.HttpResponseRedirect(path)
    return response

def setlang(request):
    """
    Sets a user's language preference and redirects to a given URL or, by default, back to the previous page.
    """
    next = request.REQUEST.get('next')
    if not is_safe_url(url=next, host=request.get_host()):
        next = request.META.get('HTTP_REFERER')
        if not is_safe_url(url=next, host=request.get_host()):
            next = '/'
    response = redirect(next)

    lang_code = request.REQUEST.get('language', None)
    if lang_code and check_for_language(lang_code):
        if hasattr(request, 'session'):
            request.session[LANGUAGE_SESSION_KEY] = lang_code
        else:
            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 handle(self, request, data):
        response = shortcuts.redirect(request.build_absolute_uri())
        # Language
        lang_code = data['language']
        if lang_code and translation.check_for_language(lang_code):
            if hasattr(request, 'session'):
                request.session['django_language'] = lang_code
            response.set_cookie(settings.LANGUAGE_COOKIE_NAME, lang_code,
                                expires=_one_year())

        # Timezone
        request.session['django_timezone'] = pytz.timezone(
            data['timezone']).zone
        response.set_cookie('django_timezone', data['timezone'],
                            expires=_one_year())

        request.session['horizon_pagesize'] = data['pagesize']
        response.set_cookie('horizon_pagesize', data['pagesize'],
                            expires=_one_year())

        request.session['instance_log_length'] = data['instance_log_length']
        response.set_cookie('instance_log_length',
                            data['instance_log_length'], expires=_one_year())

        with translation.override(lang_code):
            messages.success(request,
                             encoding.force_text(_("Settings saved.")))

        return response

def hijack_translation():
    """Sabotage Django's fascist linguistical regime."""
    # Override functions that check if language is known to Django
    translation.check_for_language = lambda lang_code: True
    trans_real.check_for_language = lambda lang_code: True
    translation.get_language_from_request = get_language_from_request

    # Override django's inadequate bidi detection
    translation.get_language_bidi = get_language_bidi

    # We hijack gettext functions to install the safe variable formatting
    # override
    override_gettext(gettext)

def set_language(request):
    """
    Redirect to a given url while setting the chosen language in the
    session or 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 not is_safe_url(url=next, host=request.get_host()):
        next = request.META.get('HTTP_REFERER')
        if not is_safe_url(url=next, host=request.get_host()):
            next = '/'
    response = http.HttpResponseRedirect(next)
    if request.method == 'POST':
        lang_code = request.POST.get(LANGUAGE_QUERY_PARAMETER)
        if lang_code and check_for_language(lang_code):
            next_trans = translate_url(next, lang_code)
            if next_trans != next:
                response = http.HttpResponseRedirect(next_trans)
            if hasattr(request, 'session'):
                request.session[LANGUAGE_SESSION_KEY] = lang_code
            # Always set cookie
            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 validate_language_id(self, language_id):
        """
        Check that the language_id is supported by Kolibri
        """
        if not check_for_language(language_id):
            raise serializers.ValidationError(_("Language is not supported by Kolibri"))
        return language_id