79 lines
2.3 KiB
PHP
79 lines
2.3 KiB
PHP
<?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\T00:00:00\Z", strtotime(date("w") ? "last sunday" : "sunday"));
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$to = gmdate("Y-m-d\T00:00:00\Z", strtotime(date("w") ? "sunday" : "next sunday"));
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$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($date));
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}
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// ICS generation. Here be dragons.
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// I created the file using a Python script and reverse-engineered it to figure this out.
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header("Content-Type: text/calendar");
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// the iCalendar Validator throws a hissy fit if lines aren't CRLF terminated
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define("ICS_EOL","\r\n");
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// Header.
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echo "BEGIN:VCALENDAR".ICS_EOL;
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echo "VERSION:2.0".ICS_EOL;
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echo "PRODID:tilderadio schedule".ICS_EOL;
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echo "DTSTAMP:".formatdate("now").ICS_EOL;
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foreach ($schedule as $event) {
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// The VEVENT structure's pretty easy to generate, especially since we're already in UTC.
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echo "BEGIN:VEVENT".ICS_EOL;
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// First, we need a creation date.
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// Just go with now.
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echo "DTSTAMP:".formatdate("now").ICS_EOL;
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// Next, the event start and end.
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echo "DTEND:".formatdate($event["end"]).ICS_EOL;
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echo "DTSTART:".formatdate($event["start"]).ICS_EOL;
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// Next, the recurrence rule.
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// We assume the format is weekly. (No DJs have requested any other frequency yet.)
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echo "RRULE:FREQ=WEEKLY".ICS_EOL;
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// Next, the event title, or "summary" as the spec calls it.
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echo "SUMMARY:DJ ".$event["title"].ICS_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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// to avoid the validator complaining about lines longer than 75 characters, split after the hash
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echo ICS_EOL." ";
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// Now finish the address UID
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echo "@tilderadio.org".ICS_EOL;
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// Finally, close the VEVENT structure.
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echo "END:VEVENT".ICS_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".ICS_EOL;
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?>
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