Add iCal subscription feed for Norda Biznes events

New endpoint /kalendarz/ical returns .ics file with all upcoming events.
Compatible with Google Calendar, iOS Calendar, and Outlook subscription.
- Auto-refreshes every 6 hours (REFRESH-INTERVAL)
- Includes event time, location, description, organizer
- Handles all-day events (no time_start) and timed events
- "Subscribe" button on calendar page with copy-to-clipboard modal
- Instructions for iPhone, Google Calendar, and Outlook

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

blueprints/community/calendar/routes.py

@@ -3,11 +3,12 @@ Calendar Routes
 ===============
 
 Public calendar and event registration endpoints.
+Includes iCal subscription feed at /kalendarz/ical
 """
 
-from datetime import date
+from datetime import date, datetime, timedelta
 import calendar as cal_module
-from flask import render_template, request, redirect, url_for, flash, jsonify
+from flask import render_template, request, redirect, url_for, flash, jsonify, Response
 from flask_login import login_required, current_user
 
 from . import bp
@@ -361,3 +362,91 @@ def rsvp(event_id):
             })
     finally:
         db.close()
+
+
+@bp.route('/ical', endpoint='calendar_ical')
+def ical_feed():
+    """
+    iCal subscription feed — public endpoint (no login required).
+    Returns .ics file with all upcoming public/member events.
+    Subscribe once in Google Calendar / iOS Calendar and events sync automatically.
+    """
+    db = SessionLocal()
+    try:
+        events = db.query(NordaEvent).filter(
+            NordaEvent.event_date >= date.today() - timedelta(days=30),
+            NordaEvent.access_level.in_(['public', 'members_only'])
+        ).order_by(NordaEvent.event_date.asc()).all()
+
+        lines = [
+            'BEGIN:VCALENDAR',
+            'VERSION:2.0',
+            'PRODID:-//NordaBiznes//Kalendarz//PL',
+            'CALSCALE:GREGORIAN',
+            'METHOD:PUBLISH',
+            'X-WR-CALNAME:Norda Biznes - Wydarzenia',
+            'X-WR-TIMEZONE:Europe/Warsaw',
+            'REFRESH-INTERVAL;VALUE=DURATION:PT6H',
+            'X-PUBLISHED-TTL:PT6H',
+        ]
+
+        for event in events:
+            uid = f'event-{event.id}@nordabiznes.pl'
+
+            # Build DTSTART/DTEND
+            if event.time_start:
+                dt_start = datetime.combine(event.event_date, event.time_start)
+                dtstart = f'DTSTART;TZID=Europe/Warsaw:{dt_start.strftime("%Y%m%dT%H%M%S")}'
+                if event.time_end:
+                    dt_end = datetime.combine(event.event_date, event.time_end)
+                    dtend = f'DTEND;TZID=Europe/Warsaw:{dt_end.strftime("%Y%m%dT%H%M%S")}'
+                else:
+                    dt_end = dt_start + timedelta(hours=2)
+                    dtend = f'DTEND;TZID=Europe/Warsaw:{dt_end.strftime("%Y%m%dT%H%M%S")}'
+            else:
+                # All-day event
+                dtstart = f'DTSTART;VALUE=DATE:{event.event_date.strftime("%Y%m%d")}'
+                next_day = event.event_date + timedelta(days=1)
+                dtend = f'DTEND;VALUE=DATE:{next_day.strftime("%Y%m%d")}'
+
+            # Clean description (remove HTML, limit length)
+            desc = (event.description or '').replace('\r\n', '\\n').replace('\n', '\\n').replace(',', '\\,').replace(';', '\\;')
+            if len(desc) > 500:
+                desc = desc[:497] + '...'
+
+            summary = (event.title or '').replace(',', '\\,').replace(';', '\\;')
+            location = (event.location or '').replace(',', '\\,').replace(';', '\\;')
+
+            created = event.created_at.strftime('%Y%m%dT%H%M%SZ') if event.created_at else datetime.now().strftime('%Y%m%dT%H%M%SZ')
+
+            lines.append('BEGIN:VEVENT')
+            lines.append(f'UID:{uid}')
+            lines.append(dtstart)
+            lines.append(dtend)
+            lines.append(f'SUMMARY:{summary}')
+            if location:
+                lines.append(f'LOCATION:{location}')
+            if desc:
+                lines.append(f'DESCRIPTION:{desc}')
+            if event.external_url:
+                lines.append(f'URL:{event.external_url}')
+            else:
+                lines.append(f'URL:https://nordabiznes.pl/kalendarz/{event.id}')
+            lines.append(f'ORGANIZER;CN={event.organizer_name or "Norda Biznes"}:mailto:{event.organizer_email or "biuro@norda-biznes.info"}')
+            lines.append(f'DTSTAMP:{created}')
+            lines.append('END:VEVENT')
+
+        lines.append('END:VCALENDAR')
+
+        ical_content = '\r\n'.join(lines)
+
+        return Response(
+            ical_content,
+            mimetype='text/calendar; charset=utf-8',
+            headers={
+                'Content-Disposition': 'attachment; filename="norda-biznes.ics"',
+                'Cache-Control': 'no-cache, must-revalidate',
+            }
+        )
+    finally:
+        db.close()

templates/calendar/index.html

@@ -410,7 +410,35 @@
 {% block content %}
 <div class="calendar-header">
     <h1>Kalendarz wydarzeń</h1>
-    <p class="text-muted">Spotkania i wydarzenia Norda Biznes</p>
+    <div style="display: flex; align-items: center; gap: var(--spacing-md); flex-wrap: wrap;">
+        <p class="text-muted" style="margin: 0;">Spotkania i wydarzenia Norda Biznes</p>
+        <button onclick="showSubscribeModal()" style="display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; border-radius: var(--radius); font-size: 13px; cursor: pointer; font-weight: 500; white-space: nowrap;">
+            <svg width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><rect x="3" y="4" width="18" height="18" rx="2" ry="2"/><line x1="16" y1="2" x2="16" y2="6"/><line x1="8" y1="2" x2="8" y2="6"/><line x1="3" y1="10" x2="21" y2="10"/></svg>
+            Subskrybuj kalendarz
+        </button>
+    </div>
+</div>
+
+<!-- Subscribe modal -->
+<div id="subscribeModal" style="display:none; position:fixed; top:0; left:0; right:0; bottom:0; background:rgba(0,0,0,0.5); z-index:9999; align-items:center; justify-content:center;">
+    <div style="background:white; border-radius:var(--radius-xl); padding:24px; max-width:500px; width:90%; margin:auto; position:relative; top:50%; transform:translateY(-50%);">
+        <button onclick="document.getElementById('subscribeModal').style.display='none'" style="position:absolute; top:12px; right:16px; background:none; border:none; font-size:20px; cursor:pointer; color:#64748b;">&times;</button>
+        <h3 style="margin:0 0 8px 0; font-size:18px;">Dodaj wydarzenia do kalendarza</h3>
+        <p style="color:#64748b; font-size:13px; line-height:1.5; margin-bottom:16px;">
+            Skopiuj poniższy link i dodaj go jako subskrypcję w swoim kalendarzu.
+            Wydarzenia Izby będą się automatycznie synchronizować.
+        </p>
+        <div style="display:flex; gap:8px; margin-bottom:16px;">
+            <input id="icalUrl" readonly value="https://nordabiznes.pl/kalendarz/ical" style="flex:1; padding:8px 12px; border:1px solid #d1d5db; border-radius:var(--radius); font-size:13px; background:#f9fafb; font-family:monospace;">
+            <button onclick="copyIcalUrl()" id="copyBtn" style="padding:8px 16px; background:#1d4ed8; color:white; border:none; border-radius:var(--radius); font-size:13px; cursor:pointer; font-weight:500; white-space:nowrap;">Kopiuj</button>
+        </div>
+        <div style="font-size:12px; color:#64748b; line-height:1.6;">
+            <strong>Jak dodać:</strong><br>
+            <strong>iPhone/Mac:</strong> Ustawienia → Konta → Dodaj konto → Inne → Subskrypcja kalendarza → wklej link<br>
+            <strong>Google Calendar:</strong> Inne kalendarze (+) → Z adresu URL → wklej link<br>
+            <strong>Outlook:</strong> Dodaj kalendarz → Subskrybuj z internetu → wklej link
+        </div>
+    </div>
 </div>
 
 <!-- Toolbar z przyciskami widoku -->
@@ -664,4 +692,21 @@ async function toggleListRSVP(btn) {
     cb.addEventListener('change', applyFilter);
     applyFilter();
 })();
+
+function showSubscribeModal() {
+    document.getElementById('subscribeModal').style.display = 'flex';
+}
+
+function copyIcalUrl() {
+    var input = document.getElementById('icalUrl');
+    input.select();
+    document.execCommand('copy');
+    var btn = document.getElementById('copyBtn');
+    btn.textContent = 'Skopiowano!';
+    setTimeout(function() { btn.textContent = 'Kopiuj'; }, 2000);
+}
+
+document.getElementById('subscribeModal').addEventListener('click', function(e) {
+    if (e.target === this) this.style.display = 'none';
+});
 {% endblock %}