Add the ICS calendar generator #5
65
schedule/ics.php
Normal file
65
schedule/ics.php
Normal file
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@ -0,0 +1,65 @@
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<?php
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include 'apikey.php';
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if (empty($apikey)) {
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die("missing api key");
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}
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$context = stream_context_create([
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"http" => [
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"method" => "GET",
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"header" => "X-API-Key: $apikey\r\n"
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]
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]);
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$from = gmdate("Y-m-d\TH:i:s\Z", strtotime("now + 1 day"));
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$to = gmdate("Y-m-d\TH:i:s\Z", strtotime("now + 8 days"));
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$schedule = json_decode(
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file_get_contents(
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"https://radio.tildeverse.org/api/station/1/streamers/schedule?start=$from&end=$to",
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false,
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$context
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),
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true
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);
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usort($schedule, function ($a, $b) {
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return $a["start"] <=> $b["start"];
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});
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function formatdate($date) {
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return gmdate("Ymd\THis\Z", strtotime($date));
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}
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header("Content-Type: text/calendar");
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// ICS generation. Here be dragons.
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// I created the file using a Python script and reverse-engineered it to figure this out.
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// Header.
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echo "BEGIN:VCALENDAR".PHP_EOL;
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echo "VERSION:2.0".PHP_EOL;
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echo "PRODID:tilderadio schedule".PHP_EOL;
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foreach ($schedule as $event) {
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// The VEVENT structure's pretty easy to generate, especially since we're already in UTC.
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echo "BEGIN:VEVENT".PHP_EOL;
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// First, the event start and end.
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echo "DTEND:".formatdate($event["end"]).PHP_EOL;
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echo "DTSTART:".formatdate($event["start"]).PHP_EOL;
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// Next, the event title, or "summary" as the spec calls it.
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echo "SUMMARY:DJ ".$event["title"].PHP_EOL;
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// Finally, a unique ID for this event.
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// To make absolutely certain we don't repeat the same event ID, I decided to use a SHA256 hash of the event structure.
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echo "UID:";
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echo hash("sha256",json_encode($event));
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echo "@tilderadio.org".PHP_EOL;
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// Finally, close the VEVENT structure.
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echo "END:VEVENT".PHP_EOL;
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// Next event?
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}
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// Finally, close out the VCALENDAR structure.
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echo "END:VCALENDAR".PHP_EOL;
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?>
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