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Lib/site-packages/django/contrib/sitemaps/__init__.py

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+from urllib.parse import urlencode
+from urllib.request import urlopen
+
+from django.apps import apps as django_apps
+from django.conf import settings
+from django.core import paginator
+from django.core.exceptions import ImproperlyConfigured
+from django.urls import NoReverseMatch, reverse
+from django.utils import translation
+
+PING_URL = "https://www.google.com/webmasters/tools/ping"
+
+
+class SitemapNotFound(Exception):
+    pass
+
+
+def ping_google(sitemap_url=None, ping_url=PING_URL, sitemap_uses_https=True):
+    """
+    Alert Google that the sitemap for the current site has been updated.
+    If sitemap_url is provided, it should be an absolute path to the sitemap
+    for this site -- e.g., '/sitemap.xml'. If sitemap_url is not provided, this
+    function will attempt to deduce it by using urls.reverse().
+    """
+    sitemap_full_url = _get_sitemap_full_url(sitemap_url, sitemap_uses_https)
+    params = urlencode({'sitemap': sitemap_full_url})
+    urlopen('%s?%s' % (ping_url, params))
+
+
+def _get_sitemap_full_url(sitemap_url, sitemap_uses_https=True):
+    if not django_apps.is_installed('django.contrib.sites'):
+        raise ImproperlyConfigured("ping_google requires django.contrib.sites, which isn't installed.")
+
+    if sitemap_url is None:
+        try:
+            # First, try to get the "index" sitemap URL.
+            sitemap_url = reverse('django.contrib.sitemaps.views.index')
+        except NoReverseMatch:
+            try:
+                # Next, try for the "global" sitemap URL.
+                sitemap_url = reverse('django.contrib.sitemaps.views.sitemap')
+            except NoReverseMatch:
+                pass
+
+    if sitemap_url is None:
+        raise SitemapNotFound("You didn't provide a sitemap_url, and the sitemap URL couldn't be auto-detected.")
+
+    Site = django_apps.get_model('sites.Site')
+    current_site = Site.objects.get_current()
+    scheme = 'https' if sitemap_uses_https else 'http'
+    return '%s://%s%s' % (scheme, current_site.domain, sitemap_url)
+
+
+class Sitemap:
+    # This limit is defined by Google. See the index documentation at
+    # https://www.sitemaps.org/protocol.html#index.
+    limit = 50000
+
+    # If protocol is None, the URLs in the sitemap will use the protocol
+    # with which the sitemap was requested.
+    protocol = None
+
+    def __get(self, name, obj, default=None):
+        try:
+            attr = getattr(self, name)
+        except AttributeError:
+            return default
+        if callable(attr):
+            return attr(obj)
+        return attr
+
+    def items(self):
+        return []
+
+    def location(self, obj):
+        return obj.get_absolute_url()
+
+    @property
+    def paginator(self):
+        return paginator.Paginator(self.items(), self.limit)
+
+    def get_urls(self, page=1, site=None, protocol=None):
+        # Determine protocol
+        if self.protocol is not None:
+            protocol = self.protocol
+        if protocol is None:
+            protocol = 'http'
+
+        # Determine domain
+        if site is None:
+            if django_apps.is_installed('django.contrib.sites'):
+                Site = django_apps.get_model('sites.Site')
+                try:
+                    site = Site.objects.get_current()
+                except Site.DoesNotExist:
+                    pass
+            if site is None:
+                raise ImproperlyConfigured(
+                    "To use sitemaps, either enable the sites framework or pass "
+                    "a Site/RequestSite object in your view."
+                )
+        domain = site.domain
+
+        if getattr(self, 'i18n', False):
+            urls = []
+            current_lang_code = translation.get_language()
+            for lang_code, lang_name in settings.LANGUAGES:
+                translation.activate(lang_code)
+                urls += self._urls(page, protocol, domain)
+            translation.activate(current_lang_code)
+        else:
+            urls = self._urls(page, protocol, domain)
+
+        return urls
+
+    def _urls(self, page, protocol, domain):
+        urls = []
+        latest_lastmod = None
+        all_items_lastmod = True  # track if all items have a lastmod
+        for item in self.paginator.page(page).object_list:
+            loc = "%s://%s%s" % (protocol, domain, self.__get('location', item))
+            priority = self.__get('priority', item)
+            lastmod = self.__get('lastmod', item)
+            if all_items_lastmod:
+                all_items_lastmod = lastmod is not None
+                if (all_items_lastmod and
+                        (latest_lastmod is None or lastmod > latest_lastmod)):
+                    latest_lastmod = lastmod
+            url_info = {
+                'item': item,
+                'location': loc,
+                'lastmod': lastmod,
+                'changefreq': self.__get('changefreq', item),
+                'priority': str(priority if priority is not None else ''),
+            }
+            urls.append(url_info)
+        if all_items_lastmod and latest_lastmod:
+            self.latest_lastmod = latest_lastmod
+        return urls
+
+
+class GenericSitemap(Sitemap):
+    priority = None
+    changefreq = None
+
+    def __init__(self, info_dict, priority=None, changefreq=None, protocol=None):
+        self.queryset = info_dict['queryset']
+        self.date_field = info_dict.get('date_field')
+        self.priority = priority
+        self.changefreq = changefreq
+        self.protocol = protocol
+
+    def items(self):
+        # Make sure to return a clone; we don't want premature evaluation.
+        return self.queryset.filter()
+
+    def lastmod(self, item):
+        if self.date_field is not None:
+            return getattr(item, self.date_field)
+        return None
+
+
+default_app_config = 'django.contrib.sitemaps.apps.SiteMapsConfig'