"""Services for CalDAV integration.""" import logging from datetime import date, datetime, timedelta from typing import Optional from uuid import uuid4 from django.conf import settings from django.utils import timezone from caldav import DAVClient from caldav.lib.error import NotFoundError from core.models import Calendar logger = logging.getLogger(__name__) class CalDAVClient: """ Client for communicating with CalDAV server using the caldav library. """ def __init__(self): self.base_url = settings.CALDAV_URL # Set the base URI path as expected by the CalDAV server self.base_uri_path = "/api/v1.0/caldav/" self.timeout = 30 def _get_client(self, user) -> DAVClient: """ Get a CalDAV client for the given user. The CalDAV server requires API key authentication via Authorization header and X-Forwarded-User header for user identification. """ # CalDAV server base URL - include the base URI path that sabre/dav expects # Remove trailing slash from base_url and base_uri_path to avoid double slashes base_url_clean = self.base_url.rstrip("/") base_uri_clean = self.base_uri_path.rstrip("/") caldav_url = f"{base_url_clean}{base_uri_clean}/" # Prepare headers # API key is required for authentication headers = { "X-Forwarded-User": user.email, } outbound_api_key = settings.CALDAV_OUTBOUND_API_KEY if not outbound_api_key: raise ValueError("CALDAV_OUTBOUND_API_KEY is not configured") headers["X-Api-Key"] = outbound_api_key # No username/password needed - authentication is via API key and X-Forwarded-User header # Pass None to prevent the caldav library from trying Basic auth return DAVClient( url=caldav_url, username=None, password=None, timeout=self.timeout, headers=headers, ) def create_calendar(self, user, calendar_name: str, calendar_id: str) -> str: """ Create a new calendar in CalDAV server for the given user. Returns the CalDAV server path for the calendar. """ client = self._get_client(user) principal = client.principal() try: # Create calendar using caldav library calendar = principal.make_calendar(name=calendar_name) # CalDAV server calendar path format: /calendars/{username}/{calendar_id}/ # The caldav library returns a URL object, convert to string and extract path calendar_url = str(calendar.url) # Extract path from full URL if calendar_url.startswith(self.base_url): path = calendar_url[len(self.base_url) :] else: # Fallback: construct path manually based on standard CalDAV structure # CalDAV servers typically create calendars under /calendars/{principal}/ path = f"/calendars/{user.email}/{calendar_id}/" logger.info( "Created calendar in CalDAV server: %s at %s", calendar_name, path ) return path except Exception as e: logger.error("Failed to create calendar in CalDAV server: %s", str(e)) raise def get_events( self, user, calendar_path: str, start: Optional[datetime] = None, end: Optional[datetime] = None, ) -> list: """ Get events from a calendar within a time range. Returns list of event dictionaries with parsed data. """ # Default to current month if no range specified if start is None: start = timezone.now().replace(day=1, hour=0, minute=0, second=0) if end is None: end = start + timedelta(days=31) client = self._get_client(user) # Get calendar by URL calendar_url = f"{self.base_url}{calendar_path}" calendar = client.calendar(url=calendar_url) try: # Search for events in the date range # Convert datetime to date for search if needed start_date = start.date() if isinstance(start, datetime) else start end_date = end.date() if isinstance(end, datetime) else end events = calendar.search( event=True, start=start_date, end=end_date, expand=True, # Expand recurring events ) # Parse events into dictionaries parsed_events = [] for event in events: event_data = self._parse_event(event) if event_data: parsed_events.append(event_data) return parsed_events except NotFoundError: logger.warning("Calendar not found at path: %s", calendar_path) return [] except Exception as e: logger.error("Failed to get events from CalDAV server: %s", str(e)) raise def create_event(self, user, calendar_path: str, event_data: dict) -> str: """ Create a new event in CalDAV server. Returns the event UID. """ client = self._get_client(user) calendar_url = f"{self.base_url}{calendar_path}" calendar = client.calendar(url=calendar_url) # Extract event data dtstart = event_data.get("start", timezone.now()) dtend = event_data.get("end", dtstart + timedelta(hours=1)) summary = event_data.get("title", "New Event") description = event_data.get("description", "") location = event_data.get("location", "") # Generate UID if not provided event_uid = event_data.get("uid", str(uuid4())) try: # Create event using caldav library event = calendar.save_event( dtstart=dtstart, dtend=dtend, uid=event_uid, summary=summary, description=description, location=location, ) # Extract UID from created event # The caldav library returns an Event object if hasattr(event, "icalendar_component"): event_uid = str(event.icalendar_component.get("uid", event_uid)) elif hasattr(event, "vobject_instance"): event_uid = event.vobject_instance.vevent.uid.value logger.info("Created event in CalDAV server: %s", event_uid) return event_uid except Exception as e: logger.error("Failed to create event in CalDAV server: %s", str(e)) raise def update_event( self, user, calendar_path: str, event_uid: str, event_data: dict ) -> None: """Update an existing event in CalDAV server.""" client = self._get_client(user) calendar_url = f"{self.base_url}{calendar_path}" calendar = client.calendar(url=calendar_url) try: # Search for the event by UID events = calendar.search(event=True) target_event = None for event in events: event_uid_value = None if hasattr(event, "icalendar_component"): event_uid_value = str(event.icalendar_component.get("uid", "")) elif hasattr(event, "vobject_instance"): event_uid_value = event.vobject_instance.vevent.uid.value if event_uid_value == event_uid: target_event = event break if not target_event: raise ValueError(f"Event with UID {event_uid} not found") # Update event properties dtstart = event_data.get("start") dtend = event_data.get("end") summary = event_data.get("title") description = event_data.get("description") location = event_data.get("location") # Update using icalendar component component = target_event.icalendar_component if dtstart: component["dtstart"] = dtstart if dtend: component["dtend"] = dtend if summary: component["summary"] = summary if description is not None: component["description"] = description if location is not None: component["location"] = location # Save the updated event target_event.save() logger.info("Updated event in CalDAV server: %s", event_uid) except Exception as e: logger.error("Failed to update event in CalDAV server: %s", str(e)) raise def delete_event(self, user, calendar_path: str, event_uid: str) -> None: """Delete an event from CalDAV server.""" client = self._get_client(user) calendar_url = f"{self.base_url}{calendar_path}" calendar = client.calendar(url=calendar_url) try: # Search for the event by UID events = calendar.search(event=True) target_event = None for event in events: event_uid_value = None if hasattr(event, "icalendar_component"): event_uid_value = str(event.icalendar_component.get("uid", "")) elif hasattr(event, "vobject_instance"): event_uid_value = event.vobject_instance.vevent.uid.value if event_uid_value == event_uid: target_event = event break if not target_event: raise ValueError(f"Event with UID {event_uid} not found") # Delete the event target_event.delete() logger.info("Deleted event from CalDAV server: %s", event_uid) except Exception as e: logger.error("Failed to delete event from CalDAV server: %s", str(e)) raise def _parse_event(self, event) -> Optional[dict]: """ Parse a caldav Event object and return event data as dictionary. """ try: component = event.icalendar_component event_data = { "uid": str(component.get("uid", "")), "title": str(component.get("summary", "")), "start": component.get("dtstart").dt if component.get("dtstart") else None, "end": component.get("dtend").dt if component.get("dtend") else None, "description": str(component.get("description", "")), "location": str(component.get("location", "")), } # Convert datetime to string format for consistency if event_data["start"]: if isinstance(event_data["start"], datetime): event_data["start"] = event_data["start"].strftime("%Y%m%dT%H%M%SZ") elif isinstance(event_data["start"], date): event_data["start"] = event_data["start"].strftime("%Y%m%d") if event_data["end"]: if isinstance(event_data["end"], datetime): event_data["end"] = event_data["end"].strftime("%Y%m%dT%H%M%SZ") elif isinstance(event_data["end"], date): event_data["end"] = event_data["end"].strftime("%Y%m%d") return event_data if event_data.get("uid") else None except Exception as e: logger.warning("Failed to parse event: %s", str(e)) return None class CalendarService: """ High-level service for managing calendars and events. """ def __init__(self): self.caldav = CalDAVClient() def create_default_calendar(self, user) -> Calendar: """ Create a default calendar for a user. """ calendar_id = str(uuid4()) calendar_name = "Mon calendrier" # Create calendar in CalDAV server caldav_path = self.caldav.create_calendar(user, calendar_name, calendar_id) # Create local Calendar record calendar = Calendar.objects.create( owner=user, name=calendar_name, caldav_path=caldav_path, is_default=True, color="#3174ad", ) return calendar def create_calendar(self, user, name: str, color: str = "#3174ad") -> Calendar: """ Create a new calendar for a user. """ calendar_id = str(uuid4()) # Create calendar in CalDAV server caldav_path = self.caldav.create_calendar(user, name, calendar_id) # Create local Calendar record calendar = Calendar.objects.create( owner=user, name=name, caldav_path=caldav_path, is_default=False, color=color, ) return calendar def get_user_calendars(self, user): """ Get all calendars accessible by a user (owned + shared). """ owned = Calendar.objects.filter(owner=user) shared = Calendar.objects.filter(shares__shared_with=user) return owned.union(shared) def get_events(self, user, calendar: Calendar, start=None, end=None) -> list: """ Get events from a calendar. Returns parsed event data. """ return self.caldav.get_events(user, calendar.caldav_path, start, end) def create_event(self, user, calendar: Calendar, event_data: dict) -> str: """Create a new event.""" return self.caldav.create_event(user, calendar.caldav_path, event_data) def update_event( self, user, calendar: Calendar, event_uid: str, event_data: dict ) -> None: """Update an existing event.""" self.caldav.update_event(user, calendar.caldav_path, event_uid, event_data) def delete_event(self, user, calendar: Calendar, event_uid: str) -> None: """Delete an event.""" self.caldav.delete_event(user, calendar.caldav_path, event_uid)