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Fixed #12978 -- Added support for RSS feed stylesheets.
This commit is contained in:
Baptiste Mispelon
Sarah Boyce
parent
ce1ad98565
commit
62300b81cf
@ -160,6 +160,7 @@ class Feed:
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feed_copyright=self._get_dynamic_attr("feed_copyright", obj),
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feed_guid=self._get_dynamic_attr("feed_guid", obj),
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ttl=self._get_dynamic_attr("ttl", obj),
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stylesheets=self._get_dynamic_attr("stylesheets", obj),
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**self.feed_extra_kwargs(obj),
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)
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@ -24,6 +24,7 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
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import datetime
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import email
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import mimetypes
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from io import StringIO
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from urllib.parse import urlparse
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@ -57,6 +58,53 @@ def get_tag_uri(url, date):
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return "tag:%s%s:%s/%s" % (bits.hostname, d, bits.path, bits.fragment)
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def _guess_stylesheet_mimetype(url):
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"""
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Return the given stylesheet's mimetype tuple, using a slightly custom
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version of Python's mimetypes.guess_type().
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"""
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mimetypedb = mimetypes.MimeTypes()
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# The official mimetype for XSLT files is technically `application/xslt+xml`
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# but as of 2024 almost no browser supports that (they all expect text/xsl).
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# On top of that, windows seems to assume that the type for xsl is text/xml.
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mimetypedb.readfp(StringIO("text/xsl\txsl\ntext/xsl\txslt"))
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return mimetypedb.guess_type(url)
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class Stylesheet:
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"""An RSS stylesheet"""
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def __init__(self, url, mimetype="", media="screen"):
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self._url = url
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self._mimetype = mimetype
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self.media = media
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# Using a property to delay the evaluation of self._url as late as possible
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# in case of a lazy object (like reverse_lazy(...) for example).
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@property
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def url(self):
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return iri_to_uri(self._url)
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@property
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def mimetype(self):
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if self._mimetype == "":
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return _guess_stylesheet_mimetype(self.url)[0]
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return self._mimetype
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def __str__(self):
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data = [f'href="{self.url}"']
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if self.mimetype is not None:
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data.append(f'type="{self.mimetype}"')
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if self.media is not None:
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data.append(f'media="{self.media}"')
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return " ".join(data)
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def __repr__(self):
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return repr((self.url, self.mimetype, self.media))
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class SyndicationFeed:
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"Base class for all syndication feeds. Subclasses should provide write()"
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@ -75,12 +123,24 @@ class SyndicationFeed:
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feed_copyright=None,
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feed_guid=None,
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ttl=None,
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stylesheets=None,
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**kwargs,
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):
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def to_str(s):
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return str(s) if s is not None else s
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def to_stylesheet(s):
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return s if isinstance(s, Stylesheet) else Stylesheet(s)
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categories = categories and [str(c) for c in categories]
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if stylesheets is not None:
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if isinstance(stylesheets, (Stylesheet, str)):
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raise TypeError(
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f"stylesheets should be a list, not {stylesheets.__class__}"
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)
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stylesheets = [to_stylesheet(s) for s in stylesheets]
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self.feed = {
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"title": to_str(title),
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"link": iri_to_uri(link),
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@ -95,6 +155,7 @@ class SyndicationFeed:
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"feed_copyright": to_str(feed_copyright),
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"id": feed_guid or link,
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"ttl": to_str(ttl),
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"stylesheets": stylesheets,
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**kwargs,
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}
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self.items = []
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@ -166,6 +227,12 @@ class SyndicationFeed:
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"""
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pass
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def add_stylesheets(self, handler):
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"""
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Add stylesheet(s) to the feed. Called from write().
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"""
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pass
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def item_attributes(self, item):
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"""
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Return extra attributes to place on each item (i.e. item/entry) element.
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@ -228,6 +295,9 @@ class RssFeed(SyndicationFeed):
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def write(self, outfile, encoding):
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handler = SimplerXMLGenerator(outfile, encoding, short_empty_elements=True)
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handler.startDocument()
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# Any stylesheet must come after the start of the document but before any tag.
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# https://www.w3.org/Style/styling-XML.en.html
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self.add_stylesheets(handler)
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handler.startElement("rss", self.rss_attributes())
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handler.startElement("channel", self.root_attributes())
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self.add_root_elements(handler)
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@ -247,6 +317,10 @@ class RssFeed(SyndicationFeed):
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self.add_item_elements(handler, item)
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handler.endElement("item")
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def add_stylesheets(self, handler):
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for stylesheet in self.feed["stylesheets"] or []:
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handler.processingInstruction("xml-stylesheet", stylesheet)
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def add_root_elements(self, handler):
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handler.addQuickElement("title", self.feed["title"])
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handler.addQuickElement("link", self.feed["link"])
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@ -596,6 +596,24 @@ This example illustrates all possible attributes and methods for a
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ttl = 600 # Hard-coded Time To Live.
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# STYLESHEETS -- Optional. To set, provide one of the following three.
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# The framework looks for them in this order.
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def stylesheets(self, obj):
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"""
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Takes the object returned by get_object() and returns the feed's
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stylesheets (as URL strings or as Stylesheet instances).
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"""
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def stylesheets(self):
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"""
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Returns the feed's stylesheets (as URL strings or Stylesheet
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instances).
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"""
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# Hardcoded stylesheets.
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stylesheets = ["/stylesheet1.xsl", "stylesheet2.xsl"]
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# ITEMS -- One of the following three is required. The framework looks
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# for them in this order.
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@ -961,16 +979,26 @@ They share this interface:
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* ``feed_copyright``
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* ``feed_guid``
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* ``ttl``
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* ``stylesheets``
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Any extra keyword arguments you pass to ``__init__`` will be stored in
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``self.feed`` for use with `custom feed generators`_.
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All parameters should be strings, except ``categories``, which should be a
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sequence of strings. Beware that some control characters
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are `not allowed <https://www.w3.org/International/questions/qa-controls>`_
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in XML documents. If your content has some of them, you might encounter a
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All parameters should be strings, except for two:
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* ``categories`` should be a sequence of strings.
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* ``stylesheets`` should be a sequence of either strings or
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:class:`~django.utils.feedgenerator.Stylesheet` instances.
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Beware that some control characters are
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`not allowed <https://www.w3.org/International/questions/qa-controls>`_ in
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XML documents. If your content has some of them, you might encounter a
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:exc:`ValueError` when producing the feed.
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.. versionchanged:: 5.2
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The ``stylesheets`` argument was added.
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:meth:`.SyndicationFeed.add_item`
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Add an item to the feed with the given parameters.
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@ -1095,3 +1123,90 @@ For example, you might start implementing an iTunes RSS feed generator like so::
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There's a lot more work to be done for a complete custom feed class, but the
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above example should demonstrate the basic idea.
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.. _feed-stylesheets:
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Feed stylesheets
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----------------
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.. versionadded:: 5.2
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If you wish to have your RSS feed render nicely in a browser, you will need to
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provide styling information for the XML file, typically in XSLT_ or CSS
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formats.
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You can add this to your RSS feed by setting the ``stylesheets`` attribute on
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the feed class.
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This can be a hardcoded URL::
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from django.contrib.syndication.views import Feed
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class FeedWithHardcodedStylesheet(Feed):
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stylesheets = [
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"https://example.com/rss_stylesheet.xslt",
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]
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You can also use Django's static files system::
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from django.contrib.syndication.views import Feed
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from django.templatetags.static import static
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class FeedWithStaticFileStylesheet(Feed):
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stylesheets = [
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static("rss_styles.xslt"),
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]
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Another option is to have a view in your project that renders the XSLT
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document. You can then link it like so::
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from django.contrib.syndication.views import Feed
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from django.urls import reverse_lazy
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class FeedWithStylesheetView(Feed):
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stylesheets = [
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reverse_lazy("your-custom-view-name"),
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]
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Django will normally try to guess the MIME type of the given URL based on its
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extension, but if that fails you can specify it using the
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:class:`~django.utils.feedgenerator.Stylesheet` class::
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from django.contrib.syndication.views import Feed
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from django.utils.feedgenerator import Stylesheet
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class FeedWithHardcodedStylesheet(Feed):
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stylesheets = [
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Stylesheet("https://example.com/rss_stylesheet", mimetype="text/xsl"),
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]
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Similarly, if you'd like to use a different ``media`` attribute than ``screen``
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(Django's default), you can use the
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:class:`~django.utils.feedgenerator.Stylesheet` class again::
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from django.contrib.syndication.views import Feed
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from django.utils.feedgenerator import Stylesheet
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class FeedWithHardcodedStylesheet(Feed):
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stylesheets = [
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Stylesheet("https://example.com/rss_stylesheet.xslt", media="print"),
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]
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Any of these options can be combined when using multiple stylesheets::
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from django.contrib.syndication.views import Feed
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from django.utils.feedgenerator import Stylesheet
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class MultiStylesheetFeed(Feed):
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stylesheets = [
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"/stylesheet1.xsl",
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Stylesheet("/stylesheet2.xsl"),
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]
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.. _xslt: https://developer.mozilla.org/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT
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@ -331,6 +331,32 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
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See https://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id
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``Stylesheet``
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--------------
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.. versionadded:: 5.2
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.. class:: Stylesheet(url, mimetype="", media="screen")
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Represents an RSS stylesheet.
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.. attribute:: url
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Required argument. The URL where the stylesheet is located.
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.. attribute:: mimetype
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An optional string containing the MIME type of the stylesheet. If not
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specified, Django will attempt to guess it by using Python's
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:py:func:`mimetypes.guess_type()`. Use ``mimetype=None`` if you don't
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want your stylesheet to have a MIME type specified.
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.. attribute:: media
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An optional string which will be used as the ``media`` attribute of
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the stylesheet. Defaults to ``"screen"``. Use ``media=None`` if you
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don't want your stylesheet to have a ``media`` attribute.
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``SyndicationFeed``
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-------------------
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@ -339,7 +365,7 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
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Base class for all syndication feeds. Subclasses should provide
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``write()``.
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.. method:: __init__(title, link, description, language=None, author_email=None, author_name=None, author_link=None, subtitle=None, categories=None, feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs)
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.. method:: __init__(title, link, description, language=None, author_email=None, author_name=None, author_link=None, subtitle=None, categories=None, feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, stylesheets=None, **kwargs)
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Initialize the feed with the given dictionary of metadata, which applies
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to the entire feed.
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@ -347,8 +373,15 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
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Any extra keyword arguments you pass to ``__init__`` will be stored in
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``self.feed``.
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All parameters should be strings, except ``categories``, which should
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be a sequence of strings.
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All parameters should be strings, except for two:
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* ``categories`` should be a sequence of strings.
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* ``stylesheets`` should be a sequence of either strings or
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:class:`Stylesheet` instances.
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.. versionchanged:: 5.2
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The ``stylesheets`` argument was added.
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.. method:: add_item(title, link, description, author_email=None, author_name=None, author_link=None, pubdate=None, comments=None, unique_id=None, categories=(), item_copyright=None, ttl=None, updateddate=None, enclosures=None, **kwargs)
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@ -368,6 +401,13 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
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Add elements in the root (i.e. feed/channel) element.
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Called from ``write()``.
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.. method:: add_stylesheets(self, handler)
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.. versionadded:: 5.2
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Add stylesheet information to the document.
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Called from ``write()``.
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.. method:: item_attributes(item)
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Return extra attributes to place on each item (i.e. item/entry)
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@ -100,7 +100,10 @@ Minor features
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:mod:`django.contrib.syndication`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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* All :class:`~django.utils.feedgenerator.SyndicationFeed` classes now support
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a ``stylesheets`` attribute. If specified, an ``<? xml-stylesheet ?>``
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processing instruction will be added to the top of the document for each
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stylesheet in the given list. See :ref:`feed-stylesheets` for more details.
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Asynchronous views
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~~~~~~~~~~~~~~~~~~
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@ -236,6 +236,13 @@ class TestGetObjectFeed(TestRss2Feed):
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return "Title: %s" % item.title
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class TestFeedWithStylesheets(TestRss2Feed):
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stylesheets = [
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"/stylesheet1.xsl",
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feedgenerator.Stylesheet("/stylesheet2.xsl"),
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]
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class NaiveDatesFeed(TestAtomFeed):
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"""
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A feed with naive (non-timezone-aware) dates.
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@ -4,12 +4,16 @@ from xml.dom import minidom
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from django.contrib.sites.models import Site
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from django.contrib.syndication import views
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from django.core.exceptions import ImproperlyConfigured
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from django.templatetags.static import static
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from django.test import TestCase, override_settings
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from django.test.utils import requires_tz_support
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from django.urls import reverse, reverse_lazy
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from django.utils import timezone
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from django.utils.feedgenerator import (
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Atom1Feed,
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Rss201rev2Feed,
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Stylesheet,
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SyndicationFeed,
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rfc2822_date,
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rfc3339_date,
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)
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@ -561,6 +565,125 @@ class SyndicationFeedTest(FeedTestCase):
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doc = feed.writeString("utf-8")
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self.assertIn(f'<{tag} href="https://feed.url.com" rel="self"/>', doc)
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def test_stylesheets_none(self):
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feed = Rss201rev2Feed(
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title="test",
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link="https://example.com",
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description="test",
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stylesheets=None,
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)
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self.assertNotIn("xml-stylesheet", feed.writeString("utf-8"))
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def test_stylesheets(self):
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testdata = [
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# Plain strings.
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("/test.xsl", 'href="/test.xsl" type="text/xsl" media="screen"'),
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("/test.xslt", 'href="/test.xslt" type="text/xsl" media="screen"'),
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("/test.css", 'href="/test.css" type="text/css" media="screen"'),
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("/test", 'href="/test" media="screen"'),
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(
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"https://example.com/test.xsl",
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'href="https://example.com/test.xsl" type="text/xsl" media="screen"',
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),
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(
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"https://example.com/test.css",
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'href="https://example.com/test.css" type="text/css" media="screen"',
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),
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(
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"https://example.com/test",
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'href="https://example.com/test" media="screen"',
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),
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("/♥.xsl", 'href="/%E2%99%A5.xsl" type="text/xsl" media="screen"'),
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(
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static("stylesheet.xsl"),
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'href="/static/stylesheet.xsl" type="text/xsl" media="screen"',
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),
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(
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static("stylesheet.css"),
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'href="/static/stylesheet.css" type="text/css" media="screen"',
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),
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(static("stylesheet"), 'href="/static/stylesheet" media="screen"'),
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(
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reverse("syndication-xsl-stylesheet"),
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'href="/syndication/stylesheet.xsl" type="text/xsl" media="screen"',
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),
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(
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reverse_lazy("syndication-xsl-stylesheet"),
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'href="/syndication/stylesheet.xsl" type="text/xsl" media="screen"',
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),
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# Stylesheet objects.
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(
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Stylesheet("/test.xsl"),
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'href="/test.xsl" type="text/xsl" media="screen"',
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),
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(Stylesheet("/test.xsl", mimetype=None), 'href="/test.xsl" media="screen"'),
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(Stylesheet("/test.xsl", media=None), 'href="/test.xsl" type="text/xsl"'),
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(Stylesheet("/test.xsl", mimetype=None, media=None), 'href="/test.xsl"'),
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(
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Stylesheet("/test.xsl", mimetype="text/xml"),
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'href="/test.xsl" type="text/xml" media="screen"',
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),
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]
|
||||
for stylesheet, expected in testdata:
|
||||
feed = Rss201rev2Feed(
|
||||
title="test",
|
||||
link="https://example.com",
|
||||
description="test",
|
||||
stylesheets=[stylesheet],
|
||||
)
|
||||
doc = feed.writeString("utf-8")
|
||||
with self.subTest(expected=expected):
|
||||
self.assertIn(f"<?xml-stylesheet {expected}?>", doc)
|
||||
|
||||
def test_stylesheets_instructions_are_at_the_top(self):
|
||||
response = self.client.get("/syndication/stylesheet/")
|
||||
doc = minidom.parseString(response.content)
|
||||
self.assertEqual(doc.childNodes[0].nodeName, "xml-stylesheet")
|
||||
self.assertEqual(
|
||||
doc.childNodes[0].data,
|
||||
'href="/stylesheet1.xsl" type="text/xsl" media="screen"',
|
||||
)
|
||||
self.assertEqual(doc.childNodes[1].nodeName, "xml-stylesheet")
|
||||
self.assertEqual(
|
||||
doc.childNodes[1].data,
|
||||
'href="/stylesheet2.xsl" type="text/xsl" media="screen"',
|
||||
)
|
||||
|
||||
def test_stylesheets_typeerror_if_str_or_stylesheet(self):
|
||||
for stylesheet, error_message in [
|
||||
("/stylesheet.xsl", "stylesheets should be a list, not <class 'str'>"),
|
||||
(
|
||||
Stylesheet("/stylesheet.xsl"),
|
||||
"stylesheets should be a list, "
|
||||
"not <class 'django.utils.feedgenerator.Stylesheet'>",
|
||||
),
|
||||
]:
|
||||
args = ("title", "/link", "description")
|
||||
with self.subTest(stylesheets=stylesheet):
|
||||
self.assertRaisesMessage(
|
||||
TypeError,
|
||||
error_message,
|
||||
SyndicationFeed,
|
||||
*args,
|
||||
stylesheets=stylesheet,
|
||||
)
|
||||
|
||||
def test_stylesheets_repr(self):
|
||||
testdata = [
|
||||
(Stylesheet("/test.xsl", mimetype=None), "('/test.xsl', None, 'screen')"),
|
||||
(Stylesheet("/test.xsl", media=None), "('/test.xsl', 'text/xsl', None)"),
|
||||
(
|
||||
Stylesheet("/test.xsl", mimetype=None, media=None),
|
||||
"('/test.xsl', None, None)",
|
||||
),
|
||||
(
|
||||
Stylesheet("/test.xsl", mimetype="text/xml"),
|
||||
"('/test.xsl', 'text/xml', 'screen')",
|
||||
),
|
||||
]
|
||||
for stylesheet, expected in testdata:
|
||||
self.assertEqual(repr(stylesheet), expected)
|
||||
|
||||
@requires_tz_support
|
||||
def test_feed_last_modified_time_naive_date(self):
|
||||
"""
|
||||
|
||||
@ -36,8 +36,14 @@ urlpatterns = [
|
||||
path("syndication/articles/", feeds.ArticlesFeed()),
|
||||
path("syndication/template/", feeds.TemplateFeed()),
|
||||
path("syndication/template_context/", feeds.TemplateContextFeed()),
|
||||
path("syndication/stylesheet/", feeds.TestFeedWithStylesheets()),
|
||||
path("syndication/rss2/single-enclosure/", feeds.TestSingleEnclosureRSSFeed()),
|
||||
path("syndication/rss2/multiple-enclosure/", feeds.TestMultipleEnclosureRSSFeed()),
|
||||
path("syndication/atom/single-enclosure/", feeds.TestSingleEnclosureAtomFeed()),
|
||||
path("syndication/atom/multiple-enclosure/", feeds.TestMultipleEnclosureAtomFeed()),
|
||||
path(
|
||||
"syndication/stylesheet.xsl",
|
||||
lambda request: None,
|
||||
name="syndication-xsl-stylesheet",
|
||||
),
|
||||
]
|
||||
|
||||
@ -1,7 +1,9 @@
|
||||
import datetime
|
||||
from unittest import mock
|
||||
|
||||
from django.test import SimpleTestCase
|
||||
from django.utils import feedgenerator
|
||||
from django.utils.functional import SimpleLazyObject
|
||||
from django.utils.timezone import get_fixed_timezone
|
||||
|
||||
|
||||
@ -148,3 +150,12 @@ class FeedgeneratorTests(SimpleTestCase):
|
||||
rss_feed.latest_post_date().tzinfo,
|
||||
datetime.timezone.utc,
|
||||
)
|
||||
|
||||
def test_stylesheet_keeps_lazy_urls(self):
|
||||
m = mock.Mock(return_value="test.css")
|
||||
stylesheet = feedgenerator.Stylesheet(SimpleLazyObject(m))
|
||||
m.assert_not_called()
|
||||
self.assertEqual(
|
||||
str(stylesheet), 'href="test.css" type="text/css" media="screen"'
|
||||
)
|
||||
m.assert_called_once()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user