Auto podcaster

bridges/AutoPodcasterBridge.php

@@ -0,0 +1,152 @@
+<?php
+
+class AutoPodcasterBridge extends FeedExpander
+{
+    const MAINTAINER = 'boyska';
+    const NAME = 'Auto Podcaster';
+    const URI = 'https://github.com/RSS-Bridge/rss-bridge/pull/4016';
+    const CACHE_TIMEOUT = 300; // 5m
+    const DESCRIPTION = 'Make a "multimedia" podcast out of a normal feed';
+    const PARAMETERS = [
+        'url' => [
+            'url' => [
+                'name'          => 'URL',
+                'exampleValue'  => 'https://lorem-rss.herokuapp.com/feed?unit=day',
+                'required'      => true,
+            ],
+            'feed_only' => [
+                'name'          => 'Only look at the content of the feed, don\'t check on the website',
+                'type'          => 'checkbox',
+                'defaultValue'  => 'checked',
+                'required'      => false,
+            ],
+        ],
+    ];
+
+    public function collectData()
+    {
+        if (
+            $this->getInput('url')
+            && substr($this->getInput('url'), 0, strlen('http')) !== 'http'
+        ) {
+            // just in case someone find a way to access local files by playing with the url
+            throw new \Exception('The url parameter must either refer to http or https protocol.');
+        }
+        $this->collectExpandableDatas($this->getURI());
+    }
+
+    protected function parseItem($item)
+    {
+        $dom = false;
+        if (!$this->getInput('feed_only')) {
+            $dom = getSimpleHTMLDOMCached($item['uri'], 86400 * 10); // 10d
+            // $dom will be false in case of errors
+        }
+        $audios = [];
+        if ($dom) {
+            /* 1st extraction method: by "audio" tag */
+            $audios = array_merge($audios, $this->extractAudio($dom));
+
+            /* 2nd extraction method: by "iframe" tag */
+            $audios = array_merge($audios, $this->extractIframeArchive($dom));
+        } elseif ($item['content'] !== null) {
+            $item_dom = str_get_html($item['content']);
+            /* 1st extraction method: by "audio" tag */
+            $audios = array_merge($audios, $this->extractAudio($item_dom));
+
+            /* 2nd extraction method: by "iframe" tag */
+            $audios = array_merge($audios, $this->extractIframeArchive($item_dom));
+        }
+
+        if ($audios === []) {
+            return null;
+        }
+
+        // This will actually overwrite any exiting enclosures
+        $item['enclosures'] = [];
+
+        foreach ($audios as $audio) {
+            $item['enclosures'][] = $audio['sources'][0];
+        }
+
+        return $item;
+    }
+
+    private function extractAudio($dom)
+    {
+        $audios = [];
+        foreach ($dom->find('audio') as $audioEl) {
+            $sources = [];
+            if ($audioEl->src !== false) {
+                $sources[] = $audioEl->src;
+            }
+            foreach ($audioEl->find('source') as $sourceEl) {
+                $sources[] = $sourceEl->src;
+            }
+            if ($sources) {
+                $audios[$sources[0]] = ['sources' => $sources];
+            }
+        }
+        return $audios;
+    }
+
+    /**
+     * Detects iframes pointing to https://archive.org/embed
+     */
+    private function extractIframeArchive($dom)
+    {
+        $audios = [];
+
+        foreach ($dom->find('iframe') as $iframeEl) {
+            if (strpos($iframeEl->src, 'https://archive.org/embed/') === 0) {
+                $listURL = preg_replace('/\/embed\//', '/details/', $iframeEl->src, 1) . '?output=json';
+                $baseURL = preg_replace('/\/embed\//', '/download/', $iframeEl->src, 1);
+
+                $json = getContents($listURL);
+
+                $list = Json::decode($json, false);
+                $audios = [];
+                foreach ($list->files as $name => $data) {
+                    if (
+                        $data->source === 'original'
+                        && $this->isAudioFormat($data->format)
+                    ) {
+                        $audios[$baseURL . $name] = ['sources' => [$baseURL . $name]];
+                    }
+                }
+                foreach ($list->files as $name => $data) {
+                    if (
+                        $data->source === 'derivative'
+                        && $this->isAudioFormat($data->format)
+                        && isset($audios[$baseURL . '/' . $data->original])
+                    ) {
+                        $audios[$baseURL . '/' . $data->original]['sources'][] = $baseURL . $name;
+                    }
+                }
+            }
+        }
+
+        return $audios;
+    }
+
+    private function isAudioFormat($formatString): bool
+    {
+        // TODO: str_contains and str_starts_with
+        return strpos($formatString, 'MP3') !== false || strpos($formatString, 'Ogg') === 0;
+    }
+
+    public function getName()
+    {
+        if (!is_null($this->getInput('url'))) {
+            return self::NAME . ' : ' . $this->getInput('url');
+        }
+
+        return parent::getName();
+    }
+
+    public function getURI()
+    {
+        return $this->getInput('url') ?? parent::getURI();
+    }
+}
+