new bridge: AutoPodcasterBridge

if you have a feed of a radio show which does not seem to be a valid
podcast, this bridge will transformt it into a valid podcast

bridges/AutoPodcasterBridge.php

@@ -0,0 +1,93 @@
+<?php
+class AutoPodcasterBridge extends FeedExpander {
+    const MAINTAINER='boyska';
+    const NAME='Auto Podcaster';
+    const URI = '';
+    const CACHE_TIMEOUT = 0;
+    const DESCRIPTION='Crea un podcast multimediale a partire da un feed normale';
+    const PARAMETERS = array('url' => array(
+        'url' => array(
+            'name' => 'URL',
+            'required' => true
+    )));
+
+    private function archiveIsAudioFormat($formatString) {
+        return strpos($formatString, 'MP3') !== false ||
+            strpos($formatString, 'Ogg') === 0;
+    }
+
+	protected function parseItem($newItem){
+		$item = parent::parseItem($newItem);
+
+		$dom = getSimpleHTMLDOMCached($item['uri']);
+        $audios = [];
+
+        /* 1st extraction method: by "audio" tag */
+        foreach($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' => [$sources]];
+            }
+        }
+
+        /* 2nd extraction method: by "iframe" tag */
+        foreach($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);
+                $list = json_decode(file_get_contents($listURL));
+                $audios = [];
+                foreach($list->files as $name =>$data) {
+                    if($data->source === 'original' &&
+                        $this->archiveIsAudioFormat($data->format)) {
+                        $audios[$baseURL . $name] = ['sources' => [$baseURL . $name]];
+                    }
+                }
+                foreach($list->files as $name =>$data) {
+                    if($data->source === 'derivative' &&
+                        $this->archiveIsAudioFormat($data->format) &&
+                        isset($audios[$baseURL . "/" . $data->original])) {
+                        $audios[$baseURL . "/" . $data->original]['sources'][] = $baseURL . $name;
+                    }
+                }
+            }
+        }
+
+
+
+        if(count($audios) === 0) {
+            return null;
+        }
+        $item['enclosures'] = array_values($audios);
+        $item['enclosures'] = [];
+        foreach(array_values($audios) as $audio) {
+            $item['enclosures'][] = $audio['sources'][0];
+        }
+        return $item;
+	}
+	public function collectData(){
+		if($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
+			returnClientError('The url parameter must either refer to http or https protocol.');
+		}
+        $this->collectExpandableDatas($this->getURI());
+	}
+	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');
+    }
+
+}
+