Initial commit.

.htaccess

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+RewriteEngine on
+#RewriteBase /BassDriveRSS
+
+RewriteRule index.rss2$ genfeed.php?type=rss2

README.md

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+This is a script that fetches a directory listing from
+[The BassDrive archives](http://archives.bassdrivearchive.com/)
+and generates an RSS feed from the files located there.
+
+It uses rsslogo.jpg for the RSS2 logo (max. 144x400px) and
+biglogo.jpg for the iTunes logo (min. 1400x1400px). Also
+intro.txt for the feed description.
+
+Files' sizes are fetched via a HEAD request and cached. The
+show length is calculated based upon assumed 128 kbps.

genfeed.php

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+<?php
+
+$baseUrl   = 'https://rpi4.mbirth.de/electronicwarfare/';
+$sourceUrl = 'http://archives.bassdrivearchive.com/6%20-%20Saturday/Electronic%20Warfare%20-%20The%20Overfiend/';
+
+$src_data = file_get_contents($sourceUrl);
+
+define('RFC_822', 'D, d M Y H:i:s T');
+
+$dom = new DOMDocument();
+$dom->loadHTML($src_data);
+
+$anchors = $dom->getElementsByTagName('a');
+
+$file_list = array();
+foreach ($anchors as $anchor) {
+    $title = $anchor->nodeValue;
+    $href = $anchor->attributes->getNamedItem('href')->nodeValue;
+
+    if (substr($href, -4) !== '.mp3') {
+        continue;
+    }
+
+    $title = urldecode(substr($href, 0, -4));   // strip off ".mp3" file extension
+    $url = $sourceUrl . $href;
+
+    $file_list[$url] = trim($title);
+}
+
+unset($dom);
+
+$namespaceURIs = [
+    'xmlns' => 'http://www.w3.org/2000/xmlns/',
+    'atom' => 'http://www.w3.org/2005/Atom',
+    'content' => 'http://purl.org/rss/1.0/modules/content/',
+    'itunes' => 'http://www.itunes.com/DTDs/Podcast-1.0.dtd',
+    'spotify' => 'http://www.spotify.com/ns/rss',
+    'psc' => 'https://podlove.org/simple-chapters/',   // for chapter marks
+    'dcterms' => 'https://purl.org/dc/terms',   // for validity periods
+];
+
+date_default_timezone_set('America/New_York');
+
+$dom = new DOMDocument('1.0', 'utf-8');
+$dom->formatOutput = true;
+$root = $dom->createElement('rss');
+$root->appendChild(new DOMAttr('version', '2.0'));
+$root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:atom', $namespaceURIs['atom']);
+$root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:content', $namespaceURIs['content']);
+$root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:itunes', $namespaceURIs['itunes']);
+$root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:spotify', $namespaceURIs['spotify']);
+// $root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:dcterms', $namespaceURIs['dcterms']);
+$root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:psc', $namespaceURIs['psc']);
+$dom->appendChild($root);
+
+$channel = $dom->createElement('channel');
+$channel->appendChild($dom->createElement('title', 'Electronic Warfare'));
+$channel->appendChild($dom->createElement('link', 'https://www.facebook.com/louis.overfiend'));
+$channel->appendChild($dom->createElement('copyright', 'BassDrive.com / Louis Overfiend'));
+$channel->appendChild($dom->createElement('itunes:author', 'BassDrive.com / Louis Overfiend'));
+
+$atom_link = $dom->createElement('atom:link');
+$atom_link->appendChild(new DOMAttr('href', $baseUrl . 'index.rss2'));
+$atom_link->appendChild(new DOMAttr('rel', 'self'));
+$atom_link->appendChild(new DOMAttr('type', 'application/rss+xml'));
+$channel->appendChild($atom_link);
+
+$channel->appendChild($dom->createElement('description', trim(str_replace('&', '&amp;', file_get_contents('intro.txt')))));
+$channel->appendChild($dom->createElement('language', 'en-us'));
+
+$image = $dom->createElement('image');
+$image->appendChild($dom->createElement('url', $baseUrl . 'rsslogo.jpg'));   // RSS spec says max. dimensions are 144x400
+$image->appendChild($dom->createElement('title', 'Electronic Warfare'));
+$image->appendChild($dom->createElement('link', 'https://www.facebook.com/louis.overfiend'));
+$image->appendChild($dom->createElement('width', '144'));
+$image->appendChild($dom->createElement('height', '144'));
+$channel->appendChild($image);
+$i_image = $dom->createElement('itunes:image');
+$i_image->appendChild(new DOMAttr('href', $baseUrl . 'biglogo.jpg'));   // Apple requires min.(!) size of 1400x1400, 1:1 aspect
+$channel->appendChild($i_image);
+
+$channel->appendChild($dom->createElement('lastBuildDate', date(RFC_822)));
+$channel->appendChild($dom->createElement('docs', 'http://blogs.law.harvard.edu/tech/rss'));
+$channel->appendChild($dom->createElement('generator', 'Handcrafted with love'));
+$channel->appendChild($dom->createElement('managingEditor', 'markus@birth-online.de (Markus Birth)'));
+$channel->appendChild($dom->createElement('webMaster', 'markus@birth-online.de (Markus Birth)'));
+$channel->appendChild($dom->createElement('ttl', '60'));
+
+$skipDays = $dom->createElement('skipDays');
+$skipDays->appendChild($dom->createElement('day', 'Monday'));
+$skipDays->appendChild($dom->createElement('day', 'Tuesday'));
+$skipDays->appendChild($dom->createElement('day', 'Wednesday'));
+$skipDays->appendChild($dom->createElement('day', 'Thursday'));
+$skipDays->appendChild($dom->createElement('day', 'Friday'));
+$skipDays->appendChild($dom->createElement('day', 'Sunday'));
+$channel->appendChild($skipDays);
+
+$i_cat = $dom->createElement('itunes:category');
+$i_cat->appendChild(new DOMAttr('text', 'Music'));
+$channel->appendChild($i_cat);
+$channel->appendChild($dom->createElement('itunes:explicit', 'clean'));
+$channel->appendChild($dom->createElement('itunes:complete', 'no'));      // "yes" = show has ended, no further episodes
+$channel->appendChild($dom->createElement('itunes:type', 'episodic'));    // "serial" = to be consumed oldest to newest; "episodic" = can be consumed randomly
+
+//$s_limit = $dom->createElement('spotify:limit');
+//$s_limit->appendChild(new DOMAttr('recentCount', '3'));   // At most this number of episodes appear in the client
+//$channel->appendChild($s_limit);
+
+//$channel->appendChild($dom->createElement('spotify:countryOfOrigin', 'us'));   // set target market/territory by country, omit for "global"
+
+$len_cache = array();
+$cache_dirty = false;
+if (file_exists('genfeed.cache')) {
+    $len_cache = json_decode(file_get_contents('genfeed.cache'), true);
+}
+
+function getSize($url)
+{
+    global $len_cache, $cache_dirty;
+    if (isset($len_cache[$url])) {
+        return $len_cache[$url];
+    }
+
+    $context = stream_context_set_default(array(
+        'http' => array(
+            'method' => 'HEAD',
+        ),
+    ));
+    $headers = get_headers($url, 1);
+    $length = intval($headers['Content-Length']);
+    $len_cache[$url] = $length;
+    $cache_dirty = true;
+    return $length;
+}
+
+function getDuration($size)
+{
+    //  70445111 Bytes = 01:13:22.80 =  73:22.80 = 4402.80 seconds (128 kb/s)
+    // 147530737 Bytes = 02:33:40.64 = 153:40.64 = 9220.64 seconds (128 kb/s)
+    $seconds = $size / (128000 / 8);
+
+    $hours = intdiv($seconds, 3600);
+    $seconds = $seconds % 3600;
+    $minutes = intdiv($seconds, 60);
+    $seconds = $seconds % 60;
+    return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);
+}
+
+$latest_date = -1;
+foreach ($file_list as $url => $title) {
+    $item = $dom->createElement('item');
+    $guid = $dom->createElement('guid', $url);
+    $guid->appendChild(new DOMAttr('isPermalink', 'true'));   // guid is a static URL
+    $item->appendChild($guid);
+    $item->appendChild($dom->createElement('title', $title));
+
+    $size = getSize($url);
+
+    $enclosure = $dom->createElement('enclosure');
+    $enclosure->appendChild(new DOMAttr('type', 'audio/mpeg'));
+    $enclosure->appendChild(new DOMAttr('length', $size));
+    $enclosure->appendChild(new DOMAttr('url', $url));
+    $item->appendChild($enclosure);
+
+    $item->appendChild($dom->createElement('itunes:duration', getDuration($size)));
+
+    $datestr = substr($title, 1, 10);
+    $pubDate = mktime(11, 00, 00, intval(substr($datestr, 5, 2)), intval(substr($datestr, 8, 2)), intval(substr($datestr, 0, 4)));
+    $item->appendChild($dom->createElement('pubDate', date(RFC_822, $pubDate)));
+
+    if ($pubDate > $latest_date) {
+        $latest_date = $pubDate;
+    }
+    
+    $channel->appendChild($item);
+}
+
+$channel->appendChild($dom->createElement('pubDate', date(RFC_822, $latest_date)));
+
+$root->appendChild($channel);
+
+$dom->save('podcast.rss2');
+
+if ($cache_dirty) {
+    file_put_contents('genfeed.cache', json_encode($len_cache, JSON_PRETTY_PRINT));
+}
+
+header('Content-Type: application/rss+xml');
+echo file_get_contents('podcast.rss2');

intro.txt

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+With a 19-year consecutive run on Bassdrive.com, Overfiend has earned his stripes in the
+Drum & Bass scene.  In addition to his show, which has featured the likes of Ed Oberon,
+The Insiders, Ant TC1, Gerra and Stone, Actraiser, and more, he has also held multiple
+residencies in New York City and Phildelphia throughout his DJ career.  2020 will be the start of
+his 20th year on Bassdrive, and it promises to offer a healthy supply of the newest in
+Drum & Bass music as well as a helping of the finest special guests that the scene has to offer.