Add the ICS calendar generator #5

Merged
ben merged 1 commits from :master into master 1 year ago
  1. 65
      schedule/ics.php

65
schedule/ics.php

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