basic functionalities working

podcast_ror.info.yml

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+name: Podcast per ROR
+type: module
+description: 'Podcast specifici per radio ondarossa'
+core: 8.x
+version: 0.1
+package: Ondarossa
+dependencies:
+        - field
+        - link

podcast_ror.routing.yml

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+podcast_ror.all:
+    path: '/podcast/all.xml'
+    defaults:
+        _controller: '\Drupal\podcast_ror\Controller\PodcastRorController::podcastAll'
+        _title: 'Global podcast'
+    requirements:
+        _access: 'TRUE'
+    options:
+        no_cache: 'TRUE'

src/Controller/PodcastRorController.php

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+<?php
+namespace Drupal\podcast_ror\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Template\TwigEnvironment;
+
+class PodcastRorController extends ControllerBase {
+    protected $state;
+    protected $twig;
+    public function __construct($state, TwigEnvironment $twig) {
+        $this->state = $state;
+        $this->twig = $twig;
+    }
+
+    public static function create(ContainerInterface $container) {
+        return new static(
+            $container->get('state'),
+            $container->get('twig')
+        );
+    }
+
+    private function query() {
+        //TODO: estrai argomento dall'url
+        $arg = 'ror_news';
+        $query = \Drupal::entityQuery('node');
+        $query
+            ->condition('status', '1')
+            ->condition('type', $arg)
+            ->sort('nid', 'DESC')
+            ->range(0, 10);
+        $nids = $query->execute();
+        // TODO: load contenuti_audio referenced entities
+        $data = array();
+        $data['nodes'] = \Drupal\node\Entity\Node::loadMultiple($nids);
+        // TODO: metti anche qui toArray() ? sembra piu pratico...
+
+        $data['audio'] = array();
+        $first = true;
+        foreach($data['nodes'] as $nid => $node) {
+            $data['audio'][$nid] = array();
+            foreach( $node->get('field_contenuti_audio')->referencedEntities() as $ai => $audio)  {
+                // print_r(get_class_methods(get_class($audio)));
+                $data['audio'][$nid][$ai] = $audio->toArray();
+            }
+            if($first === true) {
+                $first = false;
+            }
+        }
+        return $data;
+    }
+    public function podcastAll() {
+        $template = $this->twig->loadTemplate(drupal_get_path('module', 'podcast_ror') . '/templates/podcast.html.twig');
+        $tmpl_data = [ 'ror' => array('podcast' => $this->query()) ];
+        $xml = $template->render($tmpl_data);
+        $resp = new Response($xml, 200, array(
+            'Content-Type' => 'application/rss+xml'));
+        return $resp;
+    }
+}

templates/podcast.html.twig

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+<?xml version="1.0" encoding="UTF-8"?>
+<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
+<channel>
+<title>Radio Onda Rossa</title>
+<language>it-it</language>
+<itunes:subtitle>La radio di chi se la sente</itunes:subtitle>
+<itunes:author>Ondarossa</itunes:author>
+<itunes:summary>Podcast completo</itunes:summary>
+<description>Tutti gli aggiornamenti, i redazionali, le trasmissioni della radio di chi se la sente</description>
+<itunes:owner>
+    <itunes:name>Ondarossa</itunes:name>
+        <itunes:email>ondarossa@ondarossa.info</itunes:email>
+</itunes:owner>
+<itunes:explicit>no</itunes:explicit>
+<itunes:image href="http://www.ondarossa.info/favicon.ico" />
+<itunes:category text="News &amp; Politics"/>
+
+{% for nid, node in ror.podcast.nodes %}
+<item>
+    {% for num, audio in ror.podcast.audio[nid] %}
+        {% set audiourl = audio.field_audio_link[0].uri %}
+        {% set ext = audiourl|split('.')|last %}
+        {% set durata = audio.field_durata[0].value %}
+        {% set duratamin = durata // 60 %}
+        {% set duratasec = durata % 60 %}
+        <title> {{node.getTitle()}} </title>
+        <itunes:summary>Description of podcast episode content</itunes:summary>
+        <description> {{ node.get('body').getValue().0.value }} </description>
+        <link>http://example.com/podcast-1</link> {# node.getLink#}
+
+        {# TODO: detect ogg/mp3 #}
+        <enclosure url="{{ audiourl }}" type="audio/{{ext}}" length="1024"></enclosure>
+        {# TODO: formatta pubDate #}
+        <pubDate>Thu, 21 Dec 2016 16:01:07 +0000</pubDate>
+        <itunes:author>Redazione Ondarossa</itunes:author>
+        <itunes:duration>00:{{"%02d" | format(duratamin)}}:{{"%02d" | format(duratasec)}}</itunes:duration>
+        <itunes:explicit>no</itunes:explicit>
+        <guid>{{ audiourl }}</guid>
+    {% endfor %}
+    {# [fields]
+	{% for field in node.getFields() %}
+	    [[ {{ field.getName() }} ]]
+	{% endfor %}
+    [/fields] #}
+</item>
+{% endfor %}
+
+</channel>
+</rss>