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Merge pull request 'Fix ICS generator' (#6) from khuxkm/tilderadio-site:master into master
continuous-integration/drone/push Build is passing Details 

Reviewed-on: #6
This commit is contained in:
Ben Harris 2020-07-02 22:45:49 -04:00
parent c78aea671c 1c1744092b
commit 3bd8e4ab04
2 changed files with 33 additions and 15 deletions
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41
schedule/ics.php
View File

@ -1,35 +1,50 @@
<?php
$from = gmdate("Y-m-d\T00:00:00\Z", strtotime(date("w") ? "last sunday" : "sunday"));
$to = gmdate("Y-m-d\T00:00:00\Z", strtotime(date("w") ? "sunday" : "next sunday"));
include 'schedule.php';
header("Content-Type: text/calendar");
// ICS generation. Here be dragons.
// I created the file using a Python script and reverse-engineered it to figure this out.
header("Content-Type: text/calendar");
// the iCalendar Validator throws a hissy fit if lines aren't CRLF terminated
define("ICS_EOL","\r\n");
// Header.
echo "BEGIN:VCALENDAR".PHP_EOL;
echo "VERSION:2.0".PHP_EOL;
echo "PRODID:tilderadio schedule".PHP_EOL;
echo "BEGIN:VCALENDAR".ICS_EOL;
echo "VERSION:2.0".ICS_EOL;
echo "PRODID:tilderadio schedule".ICS_EOL;
echo "DTSTAMP:".formatdate("now").ICS_EOL;
foreach ($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($event["start"]).PHP_EOL;
echo "BEGIN:VEVENT".ICS_EOL;
// First, we need a creation date.
// Just go with now.
echo "DTSTAMP:".formatdate("now").ICS_EOL;
// Next, the event start and end.
echo "DTEND:".formatdate($event["end"]).ICS_EOL;
echo "DTSTART:".formatdate($event["start"]).ICS_EOL;
// Next, the recurrence rule.
// We assume the format is weekly. (No DJs have requested any other frequency yet.)
echo "RRULE:FREQ=WEEKLY".ICS_EOL;
// Next, the event title, or "summary" as the spec calls it.
echo "SUMMARY:DJ ".$event["title"].PHP_EOL;
echo "SUMMARY:DJ ".$event["title"].ICS_EOL;
// Finally, a unique ID for this event.
// To make absolutely certain we don't repeat the same event ID, I decided to use a SHA256 hash of the event structure.
echo "UID:";
echo hash("sha256",json_encode($event));
echo "@tilderadio.org".PHP_EOL;
// to avoid the validator complaining about lines longer than 75 characters, split after the hash
echo ICS_EOL." ";
// Now finish the address UID
echo "@tilderadio.org".ICS_EOL;
// Finally, close the VEVENT structure.
echo "END:VEVENT".PHP_EOL;
echo "END:VEVENT".ICS_EOL;
// Next event?
}
// Finally, close out the VCALENDAR structure.
echo "END:VCALENDAR".PHP_EOL;
echo "END:VCALENDAR".ICS_EOL;
?>

7
schedule/schedule.php
View File

@ -12,8 +12,11 @@ $context = stream_context_create([
]
]);
$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"));
// allow ics.php to overwrite $from and $to
if (!isset($from,$to)) {
$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(