Add RSS and Atom feed for the blog

blog/feeds.py

@@ -0,0 +1,45 @@
+from datetime import datetime, time
+
+from django.contrib.syndication.views import Feed
+from django.http import Http404
+
+from .models import BlogPage, BlogIndexPage
+from django.utils.feedgenerator import Atom1Feed
+
+
+class RssBlogFeed(Feed):
+    title = "Konstantin's Blog Feed"
+    description = "A blog on independent software development, Swift, Elixir and more..."
+
+    def link(self):
+        root = BlogIndexPage.objects.live().public().first()
+        if not root:
+            raise Http404
+        return root.full_url
+
+    def items(self):
+        return BlogPage.objects.live().public().order_by("-first_published_at")
+
+    def item_title(self, item):
+        return item.title
+
+    def item_description(self, item):
+        return item.intro
+
+    def item_link(self, item):
+        return item.full_url
+
+    def item_pubdate(self, item):
+        return datetime.combine(item.date, time())
+
+    def item_author_name(self, item):
+        author = item.authors.first()
+        if not author:
+            return None
+
+        return author.name
+
+
+class AtomBlogFeed(RssBlogFeed):
+    feed_type = Atom1Feed
+    subtitle = RssBlogFeed.description