rss.php

<?php
declare(strict_types=1);

/**
 * FlatFile Blog - Enhanced RSS Feed
 * Generates RSS 2.0 feed with comprehensive metadata
 */

// Check if blog is installed
if (!file_exists('config.php')) {
    header('Location: install.php');
    exit;
}

// Define constant to allow access
define('ALLOW_DIRECT_ACCESS', true);

try {
    require_once 'functions.php';
} catch (Exception $e) {
    error_log('Error loading functions.php: ' . $e->getMessage());
    die('System error. Please try again later.');
}

// Load settings and interface mode
$settings = load_settings();
$interface_mode = defined('INTERFACE_MODE') ? (string) constant('INTERFACE_MODE') : ($settings['interface_mode'] ?? 'classic');

// Get latest published posts
$posts = get_posts(1, 20, 'published'); // Get first 20 published posts

if ($interface_mode === 'custom') {
    header('Content-Type: application/json; charset=utf-8');
    header('Cache-Control: public, max-age=300');
    $index_file = CONTENT_DIR . 'index.json';
    $last_modified_ts = file_exists($index_file) ? filemtime($index_file) : time();
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $last_modified_ts) . ' GMT');

    $json_posts = [];
    foreach ($posts as $post) {
        $json_posts[] = [
            'slug' => $post['slug'] ?? '',
            'title' => $post['title'] ?? '',
            'excerpt' => $post['excerpt'] ?? '',
            'content_html' => $post['content_html'] ?? $post['content'] ?? '',
            'content_markdown' => $post['content_markdown'] ?? '',
            'content_type' => $post['content_type'] ?? 'html',
            'author' => $post['author'] ?? 'admin',
            'status' => $post['status'] ?? 'published',
            'date' => $post['date'] ?? '',
            'updated' => $post['updated'] ?? '',
            'tags' => $post['tags'] ?? [],
            'categories' => $post['categories'] ?? [],
            'meta' => $post['meta'] ?? [],
            'seo' => $post['seo'] ?? [],
            'og' => array_merge($post['og'] ?? [], ['effective_image' => post_og_image($post)]),
            'schema' => $post['schema'] ?? [],
            'related_posts' => $post['related_posts'] ?? [],
            'word_count' => $post['word_count'] ?? post_word_count($post),
            'read_time' => $post['read_time'] ?? post_read_time_minutes($post),
            'sitemap_priority' => post_sitemap_priority($post),
            'url' => absolute_url(rawurlencode($post['slug'] ?? ''))
        ];
    }

    $payload = [
        'mode' => 'custom',
        'site' => [
            'title' => SITE_TITLE,
            'base_url' => get_site_base_url(),
            'description' => $settings['site_description'] ?? '',
            'favicon_url' => site_favicon_url()
        ],
        'generated_at' => date('c'),
        'count' => count($json_posts),
        'posts' => $json_posts
    ];

    echo json_encode($payload, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    exit;
}

// Set RSS headers with caching
header('Content-Type: application/rss+xml; charset=utf-8');
header('Cache-Control: public, max-age=3600'); // 1 hour cache
$index_file = CONTENT_DIR . 'index.json';
$last_modified_ts = file_exists($index_file) ? filemtime($index_file) : time();
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $last_modified_ts) . ' GMT');

// Generate RSS XML
echo '<?xml version="1.0" encoding="UTF-8"?>';
?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
    <channel>
        <title><?php echo htmlspecialchars(SITE_TITLE); ?></title>
        <link><?php echo htmlspecialchars(absolute_url('/'), ENT_QUOTES, 'UTF-8'); ?></link>
        <description>A fast, lightweight flat-file blog system built with PHP and Bootstrap</description>
        <language>en-us</language>
        <lastBuildDate><?php echo date('r'); ?></lastBuildDate>
        <generator>FlatFile Blog v1.0</generator>
        <managingEditor>
            <?php echo htmlspecialchars($posts[0]['author'] ?? 'admin'); ?>@<?php echo parse_url(get_site_base_url(), PHP_URL_HOST); ?>
        </managingEditor>
        <webMaster>
            <?php echo htmlspecialchars($posts[0]['author'] ?? 'admin'); ?>@<?php echo parse_url(get_site_base_url(), PHP_URL_HOST); ?>
        </webMaster>
        <ttl>60</ttl>
        <atom:link href="<?php echo htmlspecialchars(absolute_url('rss'), ENT_QUOTES, 'UTF-8'); ?>" rel="self" type="application/rss+xml" />

        <?php if (!empty($posts)): ?>
            <?php foreach ($posts as $post): ?>
                <item>
                    <title><?php echo htmlspecialchars($post['title']); ?></title>
                    <link><?php echo htmlspecialchars(absolute_url(rawurlencode($post['slug'])), ENT_QUOTES, 'UTF-8'); ?></link>
                    <description>
                        <![CDATA[<?php echo htmlspecialchars($post['excerpt'] ?: substr(strip_tags($post['content'] ?? ''), 0, 200) . '...'); ?>]]>
                    </description>
                    <pubDate><?php echo date('r', strtotime($post['date'])); ?></pubDate>
                    <guid isPermaLink="true"><?php echo htmlspecialchars(absolute_url(rawurlencode($post['slug'])), ENT_QUOTES, 'UTF-8'); ?></guid>
                    <author><?php echo htmlspecialchars($post['author']); ?>@<?php echo parse_url(get_site_base_url(), PHP_URL_HOST); ?>
                    </author>
                    <dc:creator><?php echo htmlspecialchars($post['author']); ?></dc:creator>
                    <?php if (!empty($post['tags'])): ?>
                        <?php foreach ($post['tags'] as $tag): ?>
                            <category><?php echo htmlspecialchars($tag); ?></category>
                        <?php endforeach; ?>
                    <?php endif; ?>
                    <?php if (!empty($post['meta']['image'])): ?>
                        <enclosure url="<?php echo htmlspecialchars(normalize_stored_media_url($post['meta']['image']), ENT_QUOTES, 'UTF-8'); ?>" type="image/jpeg" />
                    <?php endif; ?>
                </item>
            <?php endforeach; ?>
        <?php endif; ?>
    </channel>
</rss>