initial commit

.gitignore

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+.*.sw*

calendar_ror.info.yml

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+name: Calendario ROR
+type: module
+description: 'Calendario ICS delle iniziative di ROR'
+core: 8.x
+version: 0.1
+package: Ondarossa
+dependencies:
+        - field
+        - link

calendar_ror.routing.yml

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+calendar_ror.ics:
+    path: '/calendar/calendar.ics'
+    defaults:
+        _controller: '\Drupal\calendar_ror\Controller\CalendarRorController::ics'
+        _title: 'Global calendar'
+    requirements:
+        _access: 'TRUE'
+    options:
+        no_cache: 'TRUE'

src/Controller/CalendarRorController.php

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+<?php
+namespace Drupal\calendar_ror\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Template\TwigEnvironment;
+use Drupal\node\NodeInterface;
+
+class CalendarRorController 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() {
+        $query = \Drupal::entityQuery('node');
+        $query
+            ->condition('status', '1')
+            ->condition('type', 'eventi')
+            ->sort('nid', 'DESC')
+            ->range(0, 20);
+        $nids = $query->execute();
+        $data = array();
+        $nodes_e = \Drupal\node\Entity\Node::loadMultiple($nids);
+        $data['nodes'] =  array();
+        foreach($nodes_e as $nid => $node) {
+            $data['nodes'][$nid] = $node->toArray();
+            $data['nodes'][$nid]['summary'] = htmlspecialchars(substr(
+                html_entity_decode(strip_tags($data['nodes'][$nid]['body'][0]['value'])),
+                0, 3500), ENT_XML1, 'UTF-8');
+        }
+
+        return $data;
+    }
+    public function ics() {
+        // TODO: use $path
+        $template = $this->twig->loadTemplate(drupal_get_path('module', 'calendar_ror') . '/templates/calendar.ics.twig');
+        $tmpl_data = [ 'ror' => array('calendar' => $this->query(),
+            'url' => \Drupal::service('path.current')->getPath(),
+        )];
+        //$variables['ror']['url'] = 
+        $xml = $template->render($tmpl_data);
+        $resp = new Response($xml, 200, array( 'Content-Type' => 'application/rss+xml'));
+        return $resp;
+    }
+}

templates/calendar.ics.twig

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+BEGIN:VCALENDAR
+PRODID:drupal-calendar-ror
+VERSION:2.0
+{% for nid, node in ror.calendar.nodes %}
+
+BEGIN:VEVENT
+SUMMARY: {{node.title.0.value}}
+UID: node-{{node.nid.0.value}}@www.ondarossa.info
+DTSTAMP: {{node.created.0.value}}
+DTSTART: {{node.field_data_evento.0.value|date("Ymd\\THis")}}Z
+DURATION: PT1H
+URL: http://www.ondarossa.info{{node.path.0.alias}}
+END:VEVENT
+{% endfor %}
+END:VCALENDAR