Add iCalendar public access for projects

app/Controller/Ical.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Controller;
+
+use Model\Task as TaskModel;
+
+/**
+ * iCalendar controller
+ *
+ * @package  controller
+ * @author   Frederic Guillot
+ */
+class Ical extends Base
+{
+    /**
+     * Get project iCalendar
+     *
+     * @access public
+     */
+    public function project()
+    {
+        $token = $this->request->getStringParam('token');
+        $project = $this->project->getByToken($token);
+
+        // Token verification
+        if (empty($project)) {
+            $this->forbidden(true);
+        }
+
+        $start = $this->request->getStringParam('start', strtotime('-1 month'));
+        $end = $this->request->getStringParam('end', strtotime('+2 months'));
+
+        // Common filter
+        $filter = $this->taskFilter
+            ->create()
+            ->filterByProject($project['id']);
+
+        // Tasks
+        if ($this->config->get('calendar_project_tasks', 'date_started') === 'date_creation') {
+            $calendar = $filter->copy()->filterByCreationDateRange($start, $end)->addDateTimeIcalEvents('date_creation', 'date_completed');
+        }
+        else {
+            $calendar = $filter->copy()->filterByStartDateRange($start, $end)->addDateTimeIcalEvents('date_started', 'date_completed');
+        }
+
+        // Tasks with due date
+        $calendar = $filter->copy()->filterByDueDateRange($start, $end)->addAllDayIcalEvents('date_due', $calendar);
+
+        $this->response->contentType('text/calendar; charset=utf-8');
+        echo $calendar->render();
+    }
+}