First attempt

voc/webcal.py

@@ -0,0 +1,57 @@
+import re
+import ics
+import requests
+
+from voc import GenericConference
+from voc.event import Event, EventSourceInterface
+from voc.schedule import Schedule, ScheduleException
+from voc.tools import format_duration, gen_person_uuid
+
+
+class WebcalConference(GenericConference, EventSourceInterface):
+    def __init__(self, **args):
+        GenericConference.__init__(self, **args)
+
+    def schedule(self, template: Schedule):
+        if not self.schedule_url or self.schedule_url == 'TBD':
+            raise ScheduleException('  has no schedule url yet – ignoring')
+
+        url = re.sub(r'^webcal', 'http', self.schedule_url)
+        data = requests.get(url, timeout=10).text
+        cal = ics.Calendar(data)
+
+        schedule = template.copy(self['name']) or Schedule(conference=self)
+
+        for e in cal.events:
+            event = Event(convert_to_dict(e, self), origin=self)
+            schedule.add_event(event)
+
+        return schedule
+    
+
+def convert_to_dict(e: ics.Event, context: WebcalConference) -> dict:
+    title, subtitle, event_type = re.match(r"^(.+?)(?:( ?[:–] .+?))?(?: \((.+?)\))?$", e.name).groups()
+    track, = list(e.categories) or [None]
+    return {
+        "guid": e.uid,
+        "title": title,
+        "subtitle": subtitle,
+        "abstract": e.description,
+        "description": '',  # empty description for pretalx importer (temporary workaround)
+        "date": e.begin.isoformat(),
+        "start": e.begin.format("HH:mm"),
+        "duration": format_duration(e.duration),
+        "room": e.location or context['name'],
+        "persons": [{
+            "name": p.common_name,
+            "guid": gen_person_uuid(p.email.replace('mailto:', '')),
+            # TODO: add p.role?
+        } for p in e.attendees],
+        "track": track,
+        "type": event_type or 'Other',
+        "url": e.url or None,
+    }
+
+
+if __name__ == '__main__':
+    WebcalConference()