2 files changed, 125 insertions, 0 deletions
diff --git a/includes/composer/ical/ical.php b/includes/composer/ical/ical.php
new file mode 100644
index 0000000..84d637c
--- /dev/null
+++ b/includes/composer/ical/ical.php
@@ -0,0 +1,69 @@
+<?php declare(strict_types=1);
+
+require_once('icalEvent.php');
+
+class iCal
+{
+    public $Events = array();
+
+    public function __construct(string $content)
+    {
+        $isUrl = strpos($content, 'http') === 0 && filter_var($content, FILTER_VALIDATE_URL);
+        $isFile = strpos($content, "\n") === false && file_exists($content);
+
+        if ($isUrl || $isFile)
+        {
+            $this->parse(file_get_contents($content));
+        }
+    }
+
+    protected function parse(string $content) : iCal
+    {
+        $content = str_replace("\r\n ", '', $content);
+
+        preg_match_all('`BEGIN:VEVENT(.+)END:VEVENT`Us', $content, $matches);
+        foreach($matches[0] as $eventContent)
+        {
+            $this->Events[] = new iCalEvent($eventContent);
+        }
+
+        return $this;
+    }
+
+    public function getEventsAfterDate(string $date) : array
+    {
+        $output = array();
+
+        $date = strtotime($date);
+        foreach ($this->Events as $event)
+        {
+            $eventTimestamp = strtotime($event->startDateTime);
+            if ($eventTimestamp >= $date)
+            {
+                $output[] = $event;
+            }
+        }
+
+        asort($output);
+        return $output;
+    }
+
+    public function getActiveEvents() : array
+    {
+        $output = array();
+
+        $currentDate = strtotime(date('Y-m-d'));
+        foreach ($this->Events as $event)
+        {
+            $eventStartTimestamp = strtotime($event->startDateTime);
+            $eventEndTimestamp = strtotime($event->endDateTime);
+            if ($currentDate >= $eventStartTimestamp && $currentDate <= $eventEndTimestamp)
+            {
+                $output[] = $event;
+            }
+        }
+
+        asort($output);
+        return $output;
+    }
+}
+\ No newline at end of file
diff --git a/includes/composer/ical/icalEvent.php b/includes/composer/ical/icalEvent.php
new file mode 100644
index 0000000..a2791c2
--- /dev/null
+++ b/includes/composer/ical/icalEvent.php
@@ -0,0 +1,56 @@
+<?php declare(strict_types=1);
+
+class iCalEvent
+{
+    public $title;
+    public $description;
+    public $startDateTime;
+    public $endDateTime;
+    public $location;
+    public $created;
+    public $lastModified;
+
+    public function __construct(string $eventContent)
+    {
+        $this->parseEvent($eventContent);
+    }
+
+    protected function parseEvent(string $eventContent) : iCalEvent
+    {
+        $content = str_replace("\r\n ", '', $eventContent);
+
+        $this->title = $this->getEventDetail($content, "SUMMARY:");
+        $this->description = $this->getEventDetail($content, "DESCRIPTION:");
+        $this->startDateTime = $this->getEventDateTime($content, "DTSTART");
+        $this->endDateTime = $this->getEventDateTime($content, "DTEND");
+        $this->location = $this->getEventDetail($content, "LOCATION:");
+        $this->created = date('d.m.Y H:i', strtotime($this->getEventDetail($content, "CREATED:")));
+        $this->lastModified = date('d.m.Y H:i', strtotime($this->getEventDetail($content, "LAST-MODIFIED:")));
+
+        return $this;
+    }
+
+    protected function getEventDetail(string $eventContent, string $eventDetailKey) : string
+    {
+        $output = "";
+
+        if (preg_match('`^' . $eventDetailKey . '(.*)$`m', $eventContent, $match))
+        {
+            $output = trim($match[1]);
+        }
+
+        return $output;
+    }
+
+    protected function getEventDateTime(string $eventContent, string $eventDetailKey) : string
+    {
+        $output = "";
+
+        if (preg_match('`^' . $eventDetailKey . '(?:;.+)?:([0-9]+(T[0-9]+Z?)?)`m', $eventContent, $match))
+        {
+            $output = date('d.m.Y H:i', strtotime($match[1]));
+        }
+
+        return $output;
+    }
+}
+\ No newline at end of file