Added RSS/Atom feeds to the news section.

assets/less/news/feed.less

@@ -0,0 +1,25 @@
+.news__feed {
+    display: flex;
+    color: inherit;
+    text-decoration: none;
+    font-size: 1.5em;
+    line-height: 32px;
+    height: 32px;
+    transition: background-color .2s;
+    border-radius: 4px;
+
+    &:hover,
+    &:focus {
+        background-color: fade(#fff, 20%);
+    }
+
+    &:active {
+        background-color: fade(#fff, 10%);
+    }
+
+    &__icon {
+        width: 32px;
+        height: 32px;
+        text-align: center;
+    }
+}

assets/less/news/feeds.less

@@ -0,0 +1,6 @@
+.news__feeds {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    grid-gap: 2px;
+    padding: 2px;
+}

assets/less/news/list.less

@@ -1,4 +1,5 @@
 .news__list {
+    margin: 2px 0;
 
     &__item {
         text-decoration: none;

assets/less/news/news.less

@@ -3,3 +3,5 @@
 @import "preview";
 @import "sidebar";
 @import "post";
+@import "feeds";
+@import "feed";

public/news.php

@@ -9,6 +9,7 @@ if (!empty($_GET['n']) && is_string($_GET['n'])) {
     return;
 }
 
+$feedMode = trim($_SERVER['PATH_INFO'] ?? '', '/');
 $categoryId = !empty($_GET['c']) && is_string($_GET['c']) ? (int)$_GET['c'] : 0;
 $postId = !empty($_GET['p']) && is_string($_GET['p']) ? (int)$_GET['p'] : 0;
 
@@ -67,8 +68,23 @@ if ($categoryId > 0) {
 
     $featured = news_posts_get(0, 10, $category['category_id'], true);
 
-    tpl_var('news_pagination', $categoryPagination);
-    echo tpl_render('news.category', compact('category', 'posts', 'featured'));
+    if ($feedMode === 'rss' || $feedMode === 'atom') {
+        header("Content-Type: application/{$feedMode}+xml; charset=utf-8");
+        echo news_feed($feedMode, $posts, [
+            'title' => config_get('Site', 'name') . ' » ' . $category['category_name'],
+            'subtitle' => $category['category_description'],
+            'html-url' => url('news-category', ['category' => $category['category_id']]),
+            'feed-url' => url("news-category-feed-{$feedMode}", ['category' => $category['category_id']]),
+        ]);
+        return;
+    }
+
+    echo tpl_render('news.category', [
+        'category' => $category,
+        'posts' => $posts,
+        'featured' => $featured,
+        'news_pagination' => $categoryPagination,
+    ]);
     return;
 }
 
@@ -94,5 +110,19 @@ if (!$posts) {
     return;
 }
 
-tpl_var('news_pagination', $newsPagination);
-echo tpl_render('news.index', compact('categories', 'posts'));
+if ($feedMode === 'rss' || $feedMode === 'atom') {
+    header("Content-Type: application/{$feedMode}+xml; charset=utf-8");
+    echo news_feed($feedMode, $posts, [
+        'title' => config_get('Site', 'name') . ' » Featured News',
+        'subtitle' => 'A live featured news feed.',
+        'html-url' => url('news-index'),
+        'feed-url' => url("news-feed-{$feedMode}"),
+    ]);
+    return;
+}
+
+echo tpl_render('news.index', [
+    'categories' => $categories,
+    'posts' => $posts,
+    'news_pagination' => $newsPagination,
+]);

src/news.php

@@ -297,3 +297,85 @@ function news_post_get(int $postId): array
     $getPost->bindValue(':post_id', $postId);
     return db_fetch($getPost);
 }
+
+function news_feed(string $type, array $posts, array $info): string
+{
+    $document = new DOMDocument('1.0', 'utf-8');
+    $urlPrefix = url_prefix(false);
+    $htmlUrl = $urlPrefix . $info['html-url'];
+    $feedUrl = $urlPrefix . $info['feed-url'];
+
+    if ($type === 'rss') {
+        $dateFormat = 'r';
+        $rss = $document->appendChild($document->createElement('rss'));
+        $rss->setAttribute('version', '2.0');
+        $rss->setAttribute('xmlns:atom', 'http://www.w3.org/2005/Atom');
+        $feed = $rss->appendChild($document->createElement('channel'));
+        $feed->appendChild($document->createElement('ttl', '900'));
+    } else {
+        $dateFormat = 'c';
+        $feed = $document->appendChild($document->createElement('feed'));
+        $feed->setAttribute('xmlns', 'http://www.w3.org/2005/Atom');
+        $link = $feed->appendChild($document->createElement('link'));
+        $link->setAttribute('href', $htmlUrl);
+    }
+
+    $feed->appendChild($document->createElement('title', $info['title']));
+    $feed->appendChild($document->createElement(
+        $type === 'rss' ? 'description' : 'subtitle', $info['subtitle']
+    ));
+    $feed->appendChild($document->createElement(
+        $type === 'rss' ? 'link' : 'id', $htmlUrl
+    ));
+    $feed->appendChild($document->createElement(
+        $type === 'rss' ? 'pubDate' : 'updated',
+        date($dateFormat, strtotime($posts[0]['post_created']))
+    ));
+    $link = $feed->appendChild($document->createElement($type === 'rss' ? 'atom:link' : 'link'));
+    $link->setAttribute('rel', 'self');
+    $link->setAttribute('href', $feedUrl);
+
+    foreach ($posts as $post) {
+        $entry = $feed->appendChild($document->createElement($type === 'rss' ? 'item' : 'entry'));
+        $entry->appendChild($document->createElement('title', $post['post_title']));
+        $entry->appendChild($document->createElement(
+            $type === 'rss' ? 'link' : 'id',
+            $urlPrefix . url('news-post', ['post' => $post['post_id']])
+        ));
+        $entry->appendChild($document->createElement(
+            $type === 'rss' ? 'pubDate' : 'updated',
+            date($dateFormat, strtotime($post['post_created']))
+        ));
+
+        $entry->appendChild($document->createElement(
+            $type === 'rss' ? 'description' : 'summary',
+            first_paragraph($post['post_text'])
+        ));
+
+        if ($type === 'rss') {
+            $entry->appendChild($document->createElement(
+                'comments',
+                $urlPrefix . url('news-post-comments', ['post' => $post['post_id']])
+            ));
+            $guid = $entry->appendChild($document->createElement(
+                'guid',
+                $urlPrefix . url('news-post', ['post' => $post['post_id']])
+            ));
+            $guid->setAttribute('isPermaLink', 'true');
+        } else {
+            $link = $entry->appendChild($document->createElement('link'));
+            $link->setAttribute('href', $urlPrefix . url('news-post', ['post' => $post['post_id']]));
+            $link->setAttribute('type', 'text/html');
+            $html = $entry->appendChild($document->createElement(
+                'content',
+                htmlentities(parse_text($post['post_text'], MSZ_PARSER_MARKDOWN))
+            ));
+            $html->setAttribute('type', 'html');
+            $author = $entry->appendChild($document->createElement('author'));
+            $author->appendChild($document->createElement('name', $post['username']));
+            $author->appendChild($document->createElement('uri', $urlPrefix . url('user-profile', ['user' => $post['user_id']])));
+        }
+    }
+
+    return $document->saveXML();
+}

src/url.php

@@ -30,6 +30,10 @@ define('MSZ_URLS', [
     'news-post'                         => ['/news.php',                ['p' => '<post>']],
     'news-post-comments'                => ['/news.php',                ['p' => '<post>'], 'comments'],
     'news-category'                     => ['/news.php',                ['c' => '<category>', 'page' => '<page>']],
+    'news-feed-rss'                     => ['/news.php/rss'],
+    'news-category-feed-rss'            => ['/news.php/rss',            ['c' => '<category>']],
+    'news-feed-atom'                    => ['/news.php/atom'],
+    'news-category-feed-atom'           => ['/news.php/atom',           ['c' => '<category>']],
 
     'forum-index'                       => ['/forum'],
     'forum-leaderboard'                 => ['/forum/leaderboard.php',   ['id' => '<id>', 'mode' => '<mode>']],

templates/_layout/meta.twig

@@ -56,4 +56,10 @@
             <link rel="og:url" href="{{ canonical_url }}">
         {% endif %}
     {% endif %}
+
+    {% if feeds is defined and feeds is iterable %}
+        {% for feed in feeds %}
+            <link rel="alternate" type="application/{{ feed.type }}+xml" title="{{ feed.title|default(feed.type) }}" href="{{ feed.url }}">
+        {% endfor %}
+    {% endif %}
 {% endspaceless %}

templates/news/category.twig

@@ -9,6 +9,19 @@
     'page': news_pagination.page > 2 ? news_pagination.page : 0,
 }) %}
 
+{% set feeds = [
+    {
+        'type': 'rss',
+        'title': '',
+        'url': url('news-category-feed-rss', {'category': category.category_id}),
+    },
+    {
+        'type': 'atom',
+        'title': '',
+        'url': url('news-category-feed-atom', {'category': category.category_id}),
+    },
+] %}
+
 {% block content %}
     <div class="news__container">
         <div class="news__preview__listing">
@@ -41,6 +54,29 @@
                     </div>
                 </div>
             {% endif %}
+
+            <div class="container">
+                {{ container_title('Feeds') }}
+
+                <div class="news__feeds">
+                    <a href="{{ url('news-category-feed-atom', {'category': category.category_id}) }}" class="news__feed">
+                        <div class="news__feed__icon">
+                            <i class="fas fa-rss"></i>
+                        </div>
+                        <div class="news__feed__type">
+                            Atom
+                        </div>
+                    </a>
+                    <a href="{{ url('news-category-feed-rss', {'category': category.category_id}) }}" class="news__feed">
+                        <div class="news__feed__icon">
+                            <i class="fas fa-rss"></i>
+                        </div>
+                        <div class="news__feed__type">
+                            RSS
+                        </div>
+                    </a>
+                </div>
+            </div>
         </div>
     </div>
 {% endblock %}

templates/news/index.twig

@@ -8,6 +8,19 @@
 }) %}
 {% set manage_link = '/manage/news.php?v=index' %}
 
+{% set feeds = [
+    {
+        'type': 'rss',
+        'title': '',
+        'url': url('news-feed-rss'),
+    },
+    {
+        'type': 'atom',
+        'title': '',
+        'url': url('news-feed-atom'),
+    },
+] %}
+
 {% block content %}
     <div class="news__container">
         <div class="news__preview__listing">
@@ -37,6 +50,29 @@
                     {% endfor %}
                 </div>
             </div>
+
+            <div class="container">
+                {{ container_title('Feeds') }}
+
+                <div class="news__feeds">
+                    <a href="{{ url('news-feed-atom') }}" class="news__feed">
+                        <div class="news__feed__icon">
+                            <i class="fas fa-rss"></i>
+                        </div>
+                        <div class="news__feed__type">
+                            Atom
+                        </div>
+                    </a>
+                    <a href="{{ url('news-feed-rss') }}" class="news__feed">
+                        <div class="news__feed__icon">
+                            <i class="fas fa-rss"></i>
+                        </div>
+                        <div class="news__feed__type">
+                            RSS
+                        </div>
+                    </a>
+                </div>
+            </div>
         </div>
     </div>
 {% endblock %}