52 lines
1.7 KiB
PHP
52 lines
1.7 KiB
PHP
<?php
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function calendar_next_events(int $n = 5): array {
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$url = 'https://alpinux.org/public-calendars/n5BWPYsxw7FCYozM';
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$cache = sys_get_temp_dir() . '/alpinux_calendar.ics';
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$ttl = 3600;
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if (!file_exists($cache) || (time() - filemtime($cache)) >= $ttl) {
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$data = @file_get_contents($url);
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if ($data !== false) file_put_contents($cache, $data);
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}
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if (!file_exists($cache)) return [];
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return _ical_upcoming(file_get_contents($cache), $n);
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}
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function _ical_upcoming(string $ical, int $n): array {
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$events = [];
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$now = time();
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preg_match_all('/BEGIN:VEVENT(.+?)END:VEVENT/s', $ical, $blocks);
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foreach ($blocks[1] as $b) {
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$e = [];
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if (preg_match('/^SUMMARY[^:]*:(.+)$/m', $b, $m))
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$e['title'] = trim($m[1]);
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if (preg_match('/^LOCATION[^:]*:(.+)$/m', $b, $m))
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$e['location'] = trim($m[1]);
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// Handles: DTSTART:YYYYMMDD, DTSTART:YYYYMMDDTHHmmss[Z], DTSTART;TZID=...:YYYYMMDDTHHmmss
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if (preg_match('/^DTSTART(?:;[^:]+)?:([\dTZ]+)/m', $b, $m)) {
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$raw = $m[1];
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if (strlen($raw) === 8) {
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$e['start'] = mktime(0, 0, 0, (int)substr($raw, 4, 2), (int)substr($raw, 6, 2), (int)substr($raw, 0, 4));
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} else {
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$dt = DateTime::createFromFormat('Ymd\THis\Z', $raw, new DateTimeZone('UTC'))
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?: DateTime::createFromFormat('Ymd\THis', $raw, new DateTimeZone('Europe/Paris'));
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if ($dt) $e['start'] = $dt->getTimestamp();
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}
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}
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if (isset($e['start'], $e['title']) && $e['start'] >= $now)
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$events[] = $e;
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}
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usort($events, fn($a, $b) => $a['start'] - $b['start']);
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return array_slice($events, 0, $n);
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}
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