CVE feed: add RSS feed format

Add tabs to display the various feeds thanks to sftim!

Author: mtardy

content/en/docs/reference/issues-security/official-cve-feed.md

@@ -1,9 +1,11 @@
 ---
 title: Official CVE Feed
+linkTitle: CVE feed
 weight: 25
 outputs:
   - json
-  - html 
+  - html
+  - rss
 layout: cve-feed
 ---
 
@@ -14,19 +16,25 @@ the Kubernetes Security Response Committee. See
 [Kubernetes Security and Disclosure Information](/docs/reference/issues-security/security/)
 for more details.
 
-The Kubernetes project publishes a programmatically accessible
-[JSON Feed](/docs/reference/issues-security/official-cve-feed/index.json) of 
-published security issues. You can access it by executing the following command:
-
-{{< comment >}}
-`replace` is used to bypass known issue with rendering ">"
-: https://github.com/gohugoio/hugo/issues/7229 in JSON layouts template
-`layouts/_default/cve-feed.json`
-{{< /comment >}}
+The Kubernetes project publishes a programmatically accessible feed of published
+security issues in [JSON feed](/docs/reference/issues-security/official-cve-feed/index.json)
+and [RSS feed](/docs/reference/issues-security/official-cve-feed/feed.xml)
+formats. You can access it by executing the following commands:
 
+{{< tabs name="CVE feeds" >}}
+{{% tab name="JSON feed" %}}
+[Link to JSON format](/docs/reference/issues-security/official-cve-feed/index.json)
+```shell
+curl -L https://k8s.io/docs/reference/issues-security/official-cve-feed/index.json
+```
+{{% /tab %}}
+{{% tab name="RSS feed" %}}
+[Link to RSS format](/docs/reference/issues-security/official-cve-feed/feed.xml)
 ```shell
-curl -Lv https://k8s.io/docs/reference/issues-security/official-cve-feed/index.json
+curl -L https://k8s.io/docs/reference/issues-security/official-cve-feed/feed.xml
 ```
+{{% /tab %}}
+{{< /tabs >}}
 
 {{< cve-feed >}}
 

layouts/_default/cve-feed.rss.xml

@@ -0,0 +1,25 @@
+{{ $feed := getJSON .Site.Params.cveFeedBucket -}}
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>{{ $feed.title }}</title>
+    <link>{{ .Site.BaseURL }}docs/reference/issues-security/official-cve-feed/</link>
+    <description>{{ $feed.description }}</description>
+    <generator>Hugo -- gohugo.io</generator>
+    <language>en-US</language>
+	<copyright>{{ .Site.Params.Copyright_k8s }}</copyright>
+    <lastBuildDate>{{ time.Format "Mon, 02 Jan 2006 15:04:05 -0700" $feed._kubernetes_io.updated_at | safeHTML }}</lastBuildDate>
+    {{ with .OutputFormats.Get "RSS" -}}
+	{{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
+    {{ end -}}
+    {{ range $feed.items -}}
+    <item>
+      <title>{{ .id }}</title>
+      <link>{{ .url }}</link>
+      <pubDate>{{ time.Format "Mon, 02 Jan 2006 15:04:05 -0700" .date_published | safeHTML }}</pubDate>
+      <guid>{{ .external_url }}</guid>
+      <description>{{ htmlEscape .summary }}</description>
+    </item>
+    {{ end -}}
+  </channel>
+</rss>
+