Add ICS calendar support

README.md

@@ -86,12 +86,18 @@ SMTP_FROM_NAME=Your Name
 CALDAV_URL=https://caldav.example.com/dav
 CALDAV_USERNAME=you@example.com
 CALDAV_PASSWORD=your-password
+ICS_CALENDARS=Team|https://example.com/team.ics,Family|https://example.com/family.ics
+ICS_CALENDAR_TIMEOUT=20
+ICS_CALENDARS=Team|https://example.com/team.ics,Family|https://example.com/family.ics
+ICS_CALENDAR_TIMEOUT=20
 
 CARDDAV_URL=https://carddav.example.com/dav
 CARDDAV_USERNAME=you@example.com
 CARDDAV_PASSWORD=your-password
 ```
 
+ICS calendars are optional and read-only. Set `ICS_CALENDARS` to a comma-separated list of entries, each as `name|url` or just `url` if you want the name inferred.
+
 ### Email notifications (Poke webhook)
 
 Enable notifications to send new-email alerts to Poke. The server will use IMAP IDLE when available and fall back to polling.

src/config.py

@@ -33,6 +33,8 @@ class Settings(BaseSettings):
     caldav_url: Optional[str] = Field(default=None, alias="CALDAV_URL")
     caldav_username: Optional[str] = Field(default=None, alias="CALDAV_USERNAME")
     caldav_password: Optional[SecretStr] = Field(default=None, alias="CALDAV_PASSWORD")
+    ics_calendars: Optional[str] = Field(default=None, alias="ICS_CALENDARS")
+    ics_calendar_timeout: int = Field(default=20, alias="ICS_CALENDAR_TIMEOUT")
 
     # CardDAV Configuration
     carddav_url: Optional[str] = Field(default=None, alias="CARDDAV_URL")
@@ -107,7 +109,7 @@ class Settings(BaseSettings):
             self.smtp_from_email,
         ])
 
-    def is_calendar_configured(self) -> bool:
+    def is_caldav_configured(self) -> bool:
         return all([
             self.enable_calendar,
             self.caldav_url,
@@ -115,6 +117,33 @@ class Settings(BaseSettings):
             self.caldav_password,
         ])
 
+    def is_calendar_configured(self) -> bool:
+        return all([
+            self.enable_calendar,
+            (self.is_caldav_configured() or self.get_ics_calendars()),
+        ])
+
+    def get_ics_calendars(self) -> list[tuple[Optional[str], str]]:
+        if not self.ics_calendars:
+            return []
+
+        calendars: list[tuple[Optional[str], str]] = []
+        for entry in self.ics_calendars.split(","):
+            item = entry.strip()
+            if not item:
+                continue
+            if "|" in item:
+                name, url = item.split("|", 1)
+                name = name.strip() or None
+                url = url.strip()
+            else:
+                name = None
+                url = item
+            if url:
+                calendars.append((name, url))
+
+        return calendars
+
     def is_contacts_configured(self) -> bool:
         return all([
             self.enable_contacts,

src/server.py

@@ -53,7 +53,10 @@ def setup_services():
     if settings.is_calendar_configured():
         from services.calendar_service import CalendarService
         calendar_service = CalendarService(settings)
+        if settings.is_caldav_configured():
             print(f"  Calendar service: enabled (CalDAV: {settings.caldav_url})")
+        else:
+            print("  Calendar service: enabled (ICS calendars only)")
     else:
         print("  Calendar service: disabled (not configured)")
 
@@ -116,6 +119,7 @@ def get_server_info() -> dict:
             "calendar": {
                 "enabled": calendar_service is not None,
                 "caldav_url": settings.caldav_url if calendar_service else None,
+                "ics_calendars": [c[1] for c in settings.get_ics_calendars()] if calendar_service else [],
             },
             "contacts": {
                 "enabled": contacts_service is not None,

src/services/calendar_service.py

@@ -1,8 +1,10 @@
 from datetime import datetime, timedelta
 from typing import Optional
 import uuid
+from urllib.parse import urlparse
 
 import caldav
+import httpx
 from icalendar import Calendar as iCalendar, Event as iEvent, vText
 from dateutil.parser import parse as parse_date
 from dateutil.rrule import rrulestr
@@ -24,8 +26,39 @@ class CalendarService:
         self.settings = settings
         self._client: Optional[caldav.DAVClient] = None
         self._principal = None
+        self._ics_calendars = self._load_ics_calendars()
+
+    def _load_ics_calendars(self) -> list[dict]:
+        calendars = []
+        for idx, (name, url) in enumerate(self.settings.get_ics_calendars()):
+            cal_id = f"ics:{url}"
+            calendars.append(
+                {
+                    "id": cal_id,
+                    "name": name or self._derive_ics_name(url, idx),
+                    "url": url,
+                }
+            )
+        return calendars
+
+    def _derive_ics_name(self, url: str, fallback_index: int) -> str:
+        parsed = urlparse(url)
+        if parsed.path and parsed.path != "/":
+            return parsed.path.rstrip("/").split("/")[-1] or f"ICS Calendar {fallback_index + 1}"
+        return parsed.netloc or f"ICS Calendar {fallback_index + 1}"
+
+    def _is_ics_calendar(self, calendar_id: str) -> bool:
+        return calendar_id.startswith("ics:")
+
+    def _get_ics_calendar(self, calendar_id: str) -> Optional[dict]:
+        for cal in self._ics_calendars:
+            if cal["id"] == calendar_id:
+                return cal
+        return None
 
     def _get_client(self) -> caldav.DAVClient:
+        if not self.settings.is_caldav_configured():
+            raise ValueError("CalDAV is not configured")
         if self._client is None:
             self._client = caldav.DAVClient(
                 url=self.settings.caldav_url,
@@ -40,10 +73,11 @@ class CalendarService:
         return self._principal
 
     def list_calendars(self) -> list[Calendar]:
+        result = []
+        if self.settings.is_caldav_configured():
             principal = self._get_principal()
             calendars = principal.calendars()
 
-        result = []
             for cal in calendars:
                 props = cal.get_properties([caldav.dav.DisplayName()])
                 name = props.get("{DAV:}displayname", cal.name or "Unnamed")
@@ -58,6 +92,17 @@ class CalendarService:
                     )
                 )
 
+        for ics_cal in self._ics_calendars:
+            result.append(
+                Calendar(
+                    id=ics_cal["id"],
+                    name=ics_cal["name"],
+                    color=None,
+                    description=None,
+                    is_readonly=True,
+                )
+            )
+
         return result
 
     def _get_calendar_by_id(self, calendar_id: str) -> caldav.Calendar:
@@ -77,6 +122,9 @@ class CalendarService:
         end_date: str,
         include_recurring: bool = True,
     ) -> EventList:
+        if self._is_ics_calendar(calendar_id):
+            return self._list_ics_events(calendar_id, start_date, end_date, include_recurring)
+
         calendar = self._get_calendar_by_id(calendar_id)
 
         start = parse_date(start_date)
@@ -101,6 +149,9 @@ class CalendarService:
         )
 
     def get_event(self, calendar_id: str, event_id: str) -> Optional[Event]:
+        if self._is_ics_calendar(calendar_id):
+            return self._get_ics_event(calendar_id, event_id)
+
         calendar = self._get_calendar_by_id(calendar_id)
 
         try:
@@ -127,6 +178,9 @@ class CalendarService:
         reminders: Optional[list[int]] = None,
         recurrence: Optional[str] = None,
     ) -> Event:
+        if self._is_ics_calendar(calendar_id):
+            raise ValueError("ICS calendars are read-only")
+
         calendar = self._get_calendar_by_id(calendar_id)
 
         # Create iCalendar event
@@ -184,6 +238,9 @@ class CalendarService:
         location: Optional[str] = None,
         attendees: Optional[list[str]] = None,
     ) -> Optional[Event]:
+        if self._is_ics_calendar(calendar_id):
+            raise ValueError("ICS calendars are read-only")
+
         calendar = self._get_calendar_by_id(calendar_id)
 
         # Find the event
@@ -224,6 +281,13 @@ class CalendarService:
     def delete_event(
         self, calendar_id: str, event_id: str, notify_attendees: bool = True
     ) -> OperationResult:
+        if self._is_ics_calendar(calendar_id):
+            return OperationResult(
+                success=False,
+                message="ICS calendars are read-only",
+                id=event_id,
+            )
+
         try:
             calendar = self._get_calendar_by_id(calendar_id)
 
@@ -314,3 +378,186 @@ class CalendarService:
             return None
 
         return None
+
+    def _list_ics_events(
+        self,
+        calendar_id: str,
+        start_date: str,
+        end_date: str,
+        include_recurring: bool,
+    ) -> EventList:
+        ics_calendar = self._get_ics_calendar(calendar_id)
+        if not ics_calendar:
+            raise ValueError(f"Calendar not found: {calendar_id}")
+
+        start = parse_date(start_date)
+        end = parse_date(end_date)
+
+        ical = self._fetch_ics_calendar(ics_calendar["url"])
+        events: list[Event] = []
+
+        for component in ical.walk():
+            if component.name != "VEVENT":
+                continue
+
+            parsed_events = self._parse_ics_component(
+                component, calendar_id, start, end, include_recurring
+            )
+            events.extend(parsed_events)
+
+        events.sort(key=lambda e: e.start)
+
+        return EventList(
+            events=events,
+            calendar_id=calendar_id,
+            start_date=start_date,
+            end_date=end_date,
+            total=len(events),
+        )
+
+    def _get_ics_event(self, calendar_id: str, event_id: str) -> Optional[Event]:
+        ics_calendar = self._get_ics_calendar(calendar_id)
+        if not ics_calendar:
+            raise ValueError(f"Calendar not found: {calendar_id}")
+
+        ical = self._fetch_ics_calendar(ics_calendar["url"])
+        for component in ical.walk():
+            if component.name != "VEVENT":
+                continue
+            uid = str(component.get("uid", ""))
+            if uid == event_id:
+                events = self._parse_ics_component(
+                    component,
+                    calendar_id,
+                    datetime.min,
+                    datetime.max,
+                    include_recurring=False,
+                )
+                return events[0] if events else None
+
+        return None
+
+    def _fetch_ics_calendar(self, url: str) -> iCalendar:
+        response = httpx.get(url, timeout=self.settings.ics_calendar_timeout)
+        response.raise_for_status()
+        return iCalendar.from_ical(response.text)
+
+    def _parse_ics_component(
+        self,
+        component,
+        calendar_id: str,
+        range_start: datetime,
+        range_end: datetime,
+        include_recurring: bool,
+    ) -> list[Event]:
+        base_event = self._build_event_from_component(component, calendar_id)
+        if not base_event:
+            return []
+
+        range_start_cmp = range_start
+        range_end_cmp = range_end
+        if base_event.start.tzinfo and range_start.tzinfo is None:
+            range_start_cmp = range_start.replace(tzinfo=base_event.start.tzinfo)
+            range_end_cmp = range_end.replace(tzinfo=base_event.start.tzinfo)
+        elif base_event.start.tzinfo is None and range_start.tzinfo is not None:
+            range_start_cmp = range_start.replace(tzinfo=None)
+            range_end_cmp = range_end.replace(tzinfo=None)
+
+        if not include_recurring or not base_event.recurrence_rule:
+            if base_event.start <= range_end_cmp and base_event.end >= range_start_cmp:
+                return [base_event]
+            return []
+
+        dtstart = base_event.start
+        duration = base_event.end - base_event.start
+        if duration.total_seconds() <= 0:
+            duration = timedelta(hours=1)
+
+        rrule = rrulestr(base_event.recurrence_rule, dtstart=dtstart)
+        occurrences = rrule.between(range_start_cmp, range_end_cmp, inc=True)
+        excluded = self._extract_exdates(component)
+
+        events = []
+        for occ_start in occurrences:
+            if occ_start in excluded:
+                continue
+            occ_end = occ_start + duration
+            occurrence = base_event.model_copy()
+            occurrence.start = occ_start
+            occurrence.end = occ_end
+            events.append(occurrence)
+
+        return events
+
+    def _extract_exdates(self, component) -> set[datetime]:
+        exdates: set[datetime] = set()
+        exdate_prop = component.get("exdate")
+        if not exdate_prop:
+            return exdates
+
+        exdate_list = exdate_prop if isinstance(exdate_prop, list) else [exdate_prop]
+        for exdate in exdate_list:
+            dates = getattr(exdate, "dts", [])
+            for dt in dates:
+                if isinstance(dt.dt, datetime):
+                    exdates.add(dt.dt)
+                else:
+                    exdates.add(datetime.combine(dt.dt, datetime.min.time()))
+
+        return exdates
+
+    def _build_event_from_component(self, component, calendar_id: str) -> Optional[Event]:
+        try:
+            uid = str(component.get("uid", ""))
+            dtstart = component.get("dtstart")
+            dtend = component.get("dtend")
+
+            start = dtstart.dt if dtstart else datetime.now()
+            end = dtend.dt if dtend else start + timedelta(hours=1)
+
+            all_day = False
+            if not isinstance(start, datetime):
+                all_day = True
+                start = datetime.combine(start, datetime.min.time())
+            if not isinstance(end, datetime):
+                end = datetime.combine(end, datetime.min.time())
+
+            status_str = str(component.get("status", "CONFIRMED")).upper()
+            status = EventStatus.CONFIRMED
+            if status_str == "TENTATIVE":
+                status = EventStatus.TENTATIVE
+            elif status_str == "CANCELLED":
+                status = EventStatus.CANCELLED
+
+            attendees = []
+            for attendee in component.get("attendee", []):
+                if isinstance(attendee, list):
+                    for a in attendee:
+                        email = str(a).replace("mailto:", "")
+                        attendees.append(Attendee(email=email))
+                else:
+                    email = str(attendee).replace("mailto:", "")
+                    attendees.append(Attendee(email=email))
+
+            rrule = component.get("rrule")
+            recurrence_rule = None
+            if rrule:
+                recurrence_rule = rrule.to_ical().decode("utf-8")
+
+            return Event(
+                id=uid,
+                calendar_id=calendar_id,
+                title=str(component.get("summary", "Untitled")),
+                start=start,
+                end=end,
+                all_day=all_day,
+                description=str(component.get("description", "")) or None,
+                location=str(component.get("location", "")) or None,
+                status=status,
+                attendees=attendees,
+                recurrence_rule=recurrence_rule,
+                organizer=str(component.get("organizer", "")).replace("mailto:", "") or None,
+            )
+        except Exception as e:
+            print(f"Error parsing ICS event: {e}")
+            return None

src/tools/calendar_tools.py

@@ -7,7 +7,7 @@ from services.calendar_service import CalendarService
 def register_calendar_tools(mcp: FastMCP, service: CalendarService):
     """Register all calendar-related MCP tools."""
 
-    @mcp.tool(description="List all available calendars from the CalDAV server. Returns calendar ID, name, and properties.")
+    @mcp.tool(description="List all available calendars from CalDAV and configured ICS feeds. Returns calendar ID, name, and properties.")
     def list_calendars() -> list[dict]:
         """List all calendars."""
         calendars = service.list_calendars()
@@ -26,7 +26,7 @@ def register_calendar_tools(mcp: FastMCP, service: CalendarService):
         Args:
             start_date: Start of date range (ISO format: YYYY-MM-DD)
             end_date: End of date range (ISO format: YYYY-MM-DD)
-            calendar_id: The calendar ID (URL) to query. If not provided, lists from all calendars.
+            calendar_id: The calendar ID (CalDAV URL or ICS ID) to query. If not provided, lists from all calendars.
             include_recurring: Whether to expand recurring events (default: True)
         """
         if calendar_id:
@@ -67,7 +67,7 @@ def register_calendar_tools(mcp: FastMCP, service: CalendarService):
         Get a specific event.
 
         Args:
-            calendar_id: The calendar ID containing the event
+            calendar_id: The calendar ID (CalDAV URL or ICS ID) containing the event
             event_id: The unique ID (UID) of the event
         """
         result = service.get_event(calendar_id, event_id)
@@ -89,7 +89,7 @@ def register_calendar_tools(mcp: FastMCP, service: CalendarService):
         Create a new calendar event.
 
         Args:
-            calendar_id: The calendar ID to create the event in
+            calendar_id: The calendar ID to create the event in (CalDAV only)
             title: Event title/summary
             start: Start datetime (ISO format: YYYY-MM-DDTHH:MM:SS)
             end: End datetime (ISO format: YYYY-MM-DDTHH:MM:SS)
@@ -119,7 +119,7 @@ def register_calendar_tools(mcp: FastMCP, service: CalendarService):
         Update an existing event.
 
         Args:
-            calendar_id: The calendar ID containing the event
+            calendar_id: The calendar ID containing the event (CalDAV only)
             event_id: The unique ID of the event to update
             title: New event title (optional)
             start: New start datetime (optional)
@@ -143,7 +143,7 @@ def register_calendar_tools(mcp: FastMCP, service: CalendarService):
         Delete a calendar event.
 
         Args:
-            calendar_id: The calendar ID containing the event
+            calendar_id: The calendar ID containing the event (CalDAV only)
             event_id: The unique ID of the event to delete
             notify_attendees: Whether to notify attendees of cancellation (default: True)
         """