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fix(calendar): strip HTML from ICS export and add line folding
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Browse Source 
ICS format requires plain text (not HTML) in DESCRIPTION field and
lines must not exceed 75 octets per RFC 5545. This fixes "preview
unavailable" when importing ICS into Outlook/macOS Calendar.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Maciej Pienczyn 2026-03-18 17:32:16 +01:00
parent 9bb2659ffd
commit 73c42f59a6
1 changed files with 22 additions and 3 deletions
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25
templates/calendar/event.html
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@ -649,6 +649,23 @@ async function toggleRSVP() {
}
/* --- Add to Calendar functions --- */
function stripHtml(html) {
const tmp = document.createElement('div');
tmp.innerHTML = html;
return tmp.textContent || tmp.innerText || '';
}
function foldIcsLine(line) {
// ICS spec: lines max 75 octets, continuation lines start with space
const parts = [];
while (line.length > 75) {
parts.push(line.substring(0, 75));
line = ' ' + line.substring(75);
}
parts.push(line);
return parts.join('\r\n');
}
const _evt = {
title: {{ event.title|tojson }},
date: '{{ event.event_date.strftime("%Y%m%d") }}',
@ -687,14 +704,15 @@ function downloadICS() {
const end = _evt.end ? (_evt.date + 'T' + _evt.end + '00') : (_evt.date + 'T' + _evt.start + '00');
const uid = 'nordabiz-event-{{ event.id }}@nordabiznes.pl';
const now = new Date().toISOString().replace(/[-:]/g,'').split('.')[0] + 'Z';
const plainDesc = stripHtml(_evt.description);
const descParts = [
_evt.speaker ? 'Prowadzący: ' + _evt.speaker : '',
_evt.description,
plainDesc,
'',
'Szczegóły: ' + _evt.url,
].filter(Boolean);
const desc = descParts.join('\\n');
const ics = [
const lines = [
'BEGIN:VCALENDAR',
'VERSION:2.0',
'PRODID:-//NordaBiznes//PL',
@ -715,7 +733,8 @@ function downloadICS() {
'END:VALARM',
'END:VEVENT',
'END:VCALENDAR',
].join('\r\n');
];
const ics = lines.map(foldIcsLine).join('\r\n');
const blob = new Blob([ics], { type: 'text/calendar;charset=utf-8' });
const a = document.createElement('a');
a.href = URL.createObjectURL(blob);