Add an RSS feed to the app but don't expose it yet in the html

app/classes/ReleaseInsights/Model.php

@@ -35,6 +35,7 @@ public function __construct(public string $model) {
             'owners'                => 'release_owners.php',
             'pre_firefox4_release'  => 'pre4_release.php',
             'past_release'          => 'past_release.php',
+            'rss'                   => 'rss.php',
         ];
     }
 

app/classes/ReleaseInsights/Request.php

@@ -79,6 +79,7 @@ public function getController(): string
             '/calendar/monthly/'          => 'calendar_monthly',
             '/calendar/release/schedule/' => 'ics_release_schedule',
             '/release/owners/'            => 'release_owners',
+            '/rss/'                       => 'rss',
             '/sitemap/'                   => 'sitemap',
             default                       => '404',
         };

app/controllers/rss.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+use ReleaseInsights\{Model, Template};
+
+[$latest_release_date, $releases] = (new Model('rss'))->get();
+
+header("Content-Type: application/xml; charset=UTF-8");
+
+(new Template(
+    'releases.rss.twig',
+    [
+        'title'                  => 'Firefox Desktop and Android releases',
+        'description'            => 'Release dates for Firefox Desktop and Android. Includes major and minor releases.',
+        'site_link'              => 'https://whattrainisitnow.com',
+        'latest_release_date'    => $latest_release_date,
+        'releases'               => $releases,
+       ]
+))->render();

app/models/rss.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+use ReleaseInsights\Data;
+
+$data = new Data();
+
+// We reformat the data to the same format as getDotReleases() before merging them
+$major_releases = [];
+foreach ($data->getMajorPastReleases() as $version => $date) {
+    $major_releases[$version] = [
+        'date' => $date,
+        'platform' => 'both',
+    ];
+}
+
+// We merge and reorder the releases to have the latest first
+$releases = array_merge($major_releases, $data->getDotReleases());
+krsort($releases, SORT_NATURAL);
+
+// Limit our RSS feed to 30 items, roughly a year of releases
+$releases = array_slice($releases, 0, 30);
+
+$rss = [];
+foreach ($releases as $key => $values) {
+    $rss[] = [
+        'date'     => (new DateTime($values['date']))->setTime(13, 0)->format(DateTime::RFC822),
+        'version'  => $key,
+        'platform' => $values['platform'],
+        'relnotes' => 'https://www.mozilla.org/en-US/firefox/' . $key . '/releasenotes/',
+    ];
+}
+
+// We take the last update to the feed as the first item (latest release) in the sorted array
+$latest_release_date = (new DateTime(reset($releases)['date']))->setTime(13,0)->format(DateTime::RFC822);
+
+return [$latest_release_date, $rss];

app/views/templates/releases.rss.twig

@@ -0,0 +1,26 @@
+<rss version="2.0">
+   <channel>
+      <title>{{ title }}</title>
+      <description>{{ description }}</description>
+      <link>{{ site_link }}</link>
+      <language>en-US</language>
+      <lastBuildDate>{{ latest_release_date }}</lastBuildDate>
+      <ttl>1440</ttl>
+      {% for release in releases %}
+      <item>
+         <title>Firefox {{ release.version }}</title>
+         <description>
+         Firefox release {{ release.version }} shipped on {{ release.date|format_date(pattern='MMMM d, YYYY', locale='en') }}
+         {% if release.platform == 'android' %}&lt;br&gt;This is an Android-only release{% endif %}
+         {% if release.platform == 'desktop' %}&lt;br&gt;This is a desktop-only release{% endif %}
+         </description>
+         {% if release.platform == 'android' %}
+         <link>https://www.mozilla.org/en-US/firefox/android/{{ release.version }}/releasenotes/</link>
+         {% else %}
+         <link>{{ release.relnotes }}</link>
+        {% endif %}
+         <pubDate>{{ release.date }}</pubDate>
+      </item>
+      {% endfor %}
+   </channel>
+</rss>

tests/Functional/pages.php

@@ -22,6 +22,7 @@
     ['calendar/release/schedule/?version=beta', 200, 'BEGIN:VCALENDAR', 'END:VCALENDAR'],
     ['sitemap/', 301, '', ''],
     ['sitemap.txt', 200, '', ''],
+    ['rss/', 200, '<rss version="2.0">', '</item>'],
 ];
 
 $obj = new \pchevrel\Verif('Check public pages HTTP responses and content');

tests/Unit/ReleaseInsights/RequestTest.php

@@ -30,6 +30,7 @@
     ['/calendar/release/schedule',  'ics_release_schedule'],
     ['/release/owners',             'release_owners'],
     ['/release/owners',             'release_owners'],
+    ['/rss',                        'rss'],
     ['/sitemap/',                   'sitemap'],
     ['not a good path',             '404'],
     ['not/a/goodpath',              '404'],