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"""Availability / free-time tools for the OWA MCP server.
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Ports find-free-time.py and find-meeting-time.py logic into MCP tools
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using OWAClient.
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"""
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import json
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from datetime import datetime, timedelta
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from mcp.server.fastmcp import Context
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from owa_mcp.server import mcp, AppContext
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from owa_mcp.owa_client import OWAClient
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from owa_mcp.server_lifecycle import require_client
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def _get_client(ctx: Context) -> OWAClient:
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"""Extract the OWAClient from the MCP lifespan context."""
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app_ctx: AppContext = ctx.request_context.lifespan_context
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return require_client(app_ctx.client)
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# ------------------------------------------------------------------
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# Pure helper functions (preserved from find-meeting-time.py)
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# ------------------------------------------------------------------
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def _parse_freebusy_string(
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freebusy_str: str, start_time: datetime, interval_minutes: int = 30
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) -> list[tuple]:
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"""Parse the MergedFreeBusy string.
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Each character represents a time slot:
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0 = Free, 1 = Tentative, 2 = Busy, 3 = Out of Office, 4 = Working Elsewhere
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"""
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busy_periods = []
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current_time = start_time
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for char in freebusy_str:
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next_time = current_time + timedelta(minutes=interval_minutes)
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if char in ['1', '2', '3', '4']: # Not free
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busy_periods.append((current_time, next_time, char))
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current_time = next_time
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return busy_periods
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def _merge_busy_periods(all_busy: list) -> list[tuple]:
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"""Merge overlapping busy periods."""
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if not all_busy:
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return []
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# Sort by start time
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sorted_busy = sorted(all_busy, key=lambda x: x[0])
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merged = [(sorted_busy[0][0], sorted_busy[0][1])]
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for start, end, *_ in sorted_busy[1:]:
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if start <= merged[-1][1]:
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merged[-1] = (merged[-1][0], max(merged[-1][1], end))
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else:
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merged.append((start, end))
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return merged
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def _find_free_slots(
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busy_periods: list, date, start_hour: int, end_hour: int, duration_minutes: int
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) -> list[tuple]:
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"""Find free slots on a given date within working hours."""
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day_start = datetime.combine(date, datetime.min.time().replace(hour=start_hour))
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day_end = datetime.combine(date, datetime.min.time().replace(hour=end_hour))
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# Filter busy periods to this day
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day_busy = []
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for period in busy_periods:
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start, end = period[0], period[1]
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if end.date() < date or start.date() > date:
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continue
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start = max(start, day_start)
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end = min(end, day_end)
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if start < end:
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day_busy.append((start, end))
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# Merge overlapping
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merged = _merge_busy_periods([(s, e) for s, e in day_busy])
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# Find gaps
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free_slots = []
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current = day_start
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for busy_start, busy_end in merged:
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if current < busy_start:
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gap_duration = (busy_start - current).total_seconds() / 60
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if gap_duration >= duration_minutes:
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free_slots.append((current, busy_start))
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current = max(current, busy_end)
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# Check for time after last meeting
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if current < day_end:
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gap_duration = (day_end - current).total_seconds() / 60
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if gap_duration >= duration_minutes:
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free_slots.append((current, day_end))
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return free_slots
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def _format_time(dt: datetime) -> str:
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"""Format datetime as HH:MM."""
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return dt.strftime('%H:%M')
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# ------------------------------------------------------------------
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# Helper: get busy events via GetUserAvailability (includes recurring)
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# ------------------------------------------------------------------
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def _get_availability_events(
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client: OWAClient, email: str, start_date, end_date
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) -> list[dict]:
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"""Get busy events via GetUserAvailability (expands recurring events)."""
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payload = {
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'__type': 'GetUserAvailabilityJsonRequest:#Exchange',
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'Header': {
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'__type': 'JsonRequestHeaders:#Exchange',
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'RequestServerVersion': 'Exchange2013',
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'TimeZoneContext': {
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'__type': 'TimeZoneContext:#Exchange',
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'TimeZoneDefinition': {
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'__type': 'TimeZoneDefinitionType:#Exchange',
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'Id': 'Russian Standard Time',
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},
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},
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},
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'Body': {
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'__type': 'GetUserAvailabilityRequest:#Exchange',
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'MailboxDataArray': [{
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'__type': 'MailboxData:#Exchange',
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'Email': {'__type': 'EmailAddress:#Exchange', 'Address': email},
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'AttendeeType': 'Required',
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}],
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'FreeBusyViewOptions': {
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'__type': 'FreeBusyViewOptions:#Exchange',
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'TimeWindow': {
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'__type': 'Duration:#Exchange',
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'StartTime': f'{start_date}T00:00:00',
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'EndTime': f'{end_date + timedelta(days=1)}T00:00:00',
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},
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'MergedFreeBusyIntervalInMinutes': 30,
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'RequestedView': 'DetailedMerged',
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},
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},
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}
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data = client.request('GetUserAvailability', payload)
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body = data.get('Body', {})
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events = []
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for fb_resp in body.get('FreeBusyResponseArray', []):
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fb_view = fb_resp.get('FreeBusyView', {})
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cal_events = fb_view.get('CalendarEventArray', {})
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items = (
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cal_events.get('Items', [])
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if isinstance(cal_events, dict)
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else (cal_events if isinstance(cal_events, list) else [])
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)
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for event in items:
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bt = event.get('BusyType', '')
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if bt in ('Free', 'NoData'):
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continue
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start_str = event.get('StartTime', '')
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end_str = event.get('EndTime', '')
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if not start_str or not end_str:
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continue
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try:
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start = datetime.fromisoformat(start_str.replace('Z', '+00:00')).replace(tzinfo=None)
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end = datetime.fromisoformat(end_str.replace('Z', '+00:00')).replace(tzinfo=None)
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events.append({'start': start, 'end': end, 'status': bt})
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except (ValueError, AttributeError):
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continue
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return events
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# ------------------------------------------------------------------
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# Helper: get calendar folder ID
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# ------------------------------------------------------------------
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def _get_calendar_folder_id(client: OWAClient) -> str | None:
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"""Get the calendar folder ID via GetFolder."""
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payload = {
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'__type': 'GetFolderJsonRequest:#Exchange',
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'Header': {
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'__type': 'JsonRequestHeaders:#Exchange',
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'RequestServerVersion': 'Exchange2013',
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},
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'Body': {
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'__type': 'GetFolderRequest:#Exchange',
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'FolderShape': {
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'__type': 'FolderResponseShape:#Exchange',
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'BaseShape': 'IdOnly',
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},
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'FolderIds': [
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{'__type': 'DistinguishedFolderId:#Exchange', 'Id': 'calendar'}
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],
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},
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}
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data = client.request("GetFolder", payload)
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for msg in client.extract_items(data):
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if "Folders" in msg:
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for f in msg["Folders"]:
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fid = f.get("FolderId", {}).get("Id")
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if fid:
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return fid
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return None
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# ------------------------------------------------------------------
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# Helper: get own calendar events (from find-free-time.py)
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# ------------------------------------------------------------------
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def _get_calendar_events(
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client: OWAClient, folder_id: str, start_date, end_date
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) -> list[dict]:
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"""Get calendar events within a date range. Returns list of busy period dicts."""
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events = []
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offset = 0
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batch_size = 100
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while True:
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payload = {
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'__type': 'FindItemJsonRequest:#Exchange',
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'Header': {
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'__type': 'JsonRequestHeaders:#Exchange',
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'RequestServerVersion': 'Exchange2013',
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},
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'Body': {
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'__type': 'FindItemRequest:#Exchange',
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'ItemShape': {
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'__type': 'ItemResponseShape:#Exchange',
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'BaseShape': 'AllProperties',
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},
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'ParentFolderIds': [
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{'__type': 'FolderId:#Exchange', 'Id': folder_id}
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],
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'Traversal': 'Shallow',
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'Paging': {
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'__type': 'IndexedPageView:#Exchange',
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'BasePoint': 'Beginning',
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'Offset': offset,
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'MaxEntriesReturned': batch_size,
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},
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'SortOrder': [
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{
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'__type': 'SortResults:#Exchange',
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'Order': 'Ascending',
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'Path': {
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'__type': 'PropertyUri:#Exchange',
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'FieldURI': 'Start',
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},
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}
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],
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},
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}
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data = client.request("FindItem", payload)
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items = client.extract_items(data)
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if not items:
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break
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folder_items = items[0].get('RootFolder', {}).get('Items', [])
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if not folder_items:
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break
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for item in folder_items:
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# Skip cancelled events
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if item.get('IsCancelled'):
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continue
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# Skip free/tentative slots
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fbt = item.get('FreeBusyType', 'Busy')
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if fbt in ['Free', 'NoData']:
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continue
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start_str = item.get('Start', '')
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end_str = item.get('End', '')
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if not start_str or not end_str:
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continue
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try:
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start = datetime.fromisoformat(start_str.replace('Z', '+00:00'))
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end = datetime.fromisoformat(end_str.replace('Z', '+00:00'))
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# Convert to naive datetime for comparison
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start = start.replace(tzinfo=None)
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end = end.replace(tzinfo=None)
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# Filter by date range
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if end.date() < start_date or start.date() > end_date:
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continue
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events.append({
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'start': start,
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'end': end,
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'subject': item.get('Subject', ''),
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'status': fbt,
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})
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except (ValueError, AttributeError):
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continue
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# Check if there are more items
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is_last = items[0].get('RootFolder', {}).get('IncludesLastItemInRange', True)
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if is_last:
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break
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offset += batch_size
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return events
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# ------------------------------------------------------------------
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# Tool: find_free_time
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# ------------------------------------------------------------------
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@mcp.tool()
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def find_free_time(
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start_date: str,
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end_date: str = "",
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duration_minutes: int = 30,
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start_hour: int = 9,
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end_hour: int = 18,
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ctx: Context = None,
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) -> str:
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"""Find free time slots in your own calendar.
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Analyzes your calendar events and returns available time slots
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within working hours for each weekday in the range.
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Args:
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start_date: Start date in YYYY-MM-DD format.
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end_date: End date in YYYY-MM-DD format. Defaults to start_date
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if not provided (single-day search).
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duration_minutes: Minimum slot duration in minutes. Default 30.
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start_hour: Working day start hour (0-23). Default 9.
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end_hour: Working day end hour (0-23). Default 18.
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Returns:
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JSON object with free_slots keyed by date, each containing an
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array of {start, end, duration_minutes} objects.
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"""
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client = _get_client(ctx)
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try:
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sd = datetime.strptime(start_date, '%Y-%m-%d').date()
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ed = datetime.strptime(end_date, '%Y-%m-%d').date() if end_date else sd
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except ValueError as e:
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return json.dumps({"error": f"Invalid date format: {e}"})
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try:
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# Use GetUserAvailability for accurate recurring event expansion
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if client.user_email:
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all_busy = _get_availability_events(client, client.user_email, sd, ed)
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else:
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# Fallback to FindItem (misses recurring event occurrences)
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folder_id = _get_calendar_folder_id(client)
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if not folder_id:
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return json.dumps({"error": "Could not find calendar folder. Session may have expired."})
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all_busy = _get_calendar_events(client, folder_id, sd, ed)
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except Exception as e:
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return json.dumps({"error": str(e)})
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# Convert event dicts to (start, end) tuples for _find_free_slots
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busy_periods = [(ev['start'], ev['end']) for ev in all_busy]
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result = {}
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current_date = sd
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while current_date <= ed:
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# Skip weekends
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if current_date.weekday() < 5:
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free = _find_free_slots(
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busy_periods, current_date,
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start_hour, end_hour, duration_minutes,
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)
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if free:
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result[str(current_date)] = [
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{
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"start": _format_time(s),
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"end": _format_time(e),
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"duration_minutes": int((e - s).total_seconds() / 60),
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}
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for s, e in free
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]
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current_date += timedelta(days=1)
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return json.dumps({"free_slots": result}, ensure_ascii=False)
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# ------------------------------------------------------------------
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# Tool: find_meeting_time
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# ------------------------------------------------------------------
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@mcp.tool()
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def find_meeting_time(
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emails: str,
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start_date: str,
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end_date: str = "",
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duration_minutes: int = 30,
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start_hour: int = 9,
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end_hour: int = 18,
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ctx: Context = None,
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) -> str:
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"""Find meeting times that work for multiple people.
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Uses the OWA GetUserAvailability API to check cross-mailbox
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availability and find common free slots for all attendees.
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Supports multi-day ranges — searches each weekday in the range.
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Args:
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emails: Comma-separated email addresses or names of attendees.
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start_date: Start date in YYYY-MM-DD format.
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end_date: End date in YYYY-MM-DD format. Defaults to start_date
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if not provided (single-day search).
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duration_minutes: Minimum slot duration in minutes. Default 30.
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start_hour: Working day start hour (0-23). Default 9.
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end_hour: Working day end hour (0-23). Default 18.
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|
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Returns:
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JSON object with attendee info and free_slots keyed by date,
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each containing an array of {start, end, duration_minutes}.
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"""
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client = _get_client(ctx)
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raw_list = [e.strip() for e in emails.split(',') if e.strip()]
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if not raw_list:
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return json.dumps({"error": "No email addresses provided."})
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try:
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sd = datetime.strptime(start_date, '%Y-%m-%d').date()
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ed = datetime.strptime(end_date, '%Y-%m-%d').date() if end_date else sd
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except ValueError as e:
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return json.dumps({"error": f"Invalid date format: {e}"})
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||||
# Resolve names to email addresses via ResolveNames
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email_list = []
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resolve_errors = []
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for entry in raw_list:
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if '@' in entry:
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email_list.append(entry)
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else:
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resolutions = client.resolve_names(entry, full_contact=False)
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if resolutions:
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addr = resolutions[0].get('Mailbox', {}).get('EmailAddress', '')
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if addr:
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email_list.append(addr)
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else:
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resolve_errors.append(entry)
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else:
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resolve_errors.append(entry)
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||||
if not email_list:
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return json.dumps({"error": f"Could not resolve any names to email addresses: {resolve_errors}"})
|
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# Build mailbox data (reused for each day chunk)
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mailbox_data = []
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for email in email_list:
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mailbox_data.append({
|
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'__type': 'MailboxData:#Exchange',
|
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'Email': {
|
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'__type': 'EmailAddress:#Exchange',
|
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'Address': email,
|
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},
|
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'AttendeeType': 'Required',
|
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})
|
||||
|
||||
# Query the full date range at once (API handles multi-day windows)
|
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payload = {
|
||||
'__type': 'GetUserAvailabilityJsonRequest:#Exchange',
|
||||
'Header': {
|
||||
'__type': 'JsonRequestHeaders:#Exchange',
|
||||
'RequestServerVersion': 'Exchange2013',
|
||||
'TimeZoneContext': {
|
||||
'__type': 'TimeZoneContext:#Exchange',
|
||||
'TimeZoneDefinition': {
|
||||
'__type': 'TimeZoneDefinitionType:#Exchange',
|
||||
'Id': 'Russian Standard Time',
|
||||
},
|
||||
},
|
||||
},
|
||||
'Body': {
|
||||
'__type': 'GetUserAvailabilityRequest:#Exchange',
|
||||
'MailboxDataArray': mailbox_data,
|
||||
'FreeBusyViewOptions': {
|
||||
'__type': 'FreeBusyViewOptions:#Exchange',
|
||||
'TimeWindow': {
|
||||
'__type': 'Duration:#Exchange',
|
||||
'StartTime': f'{sd}T00:00:00',
|
||||
'EndTime': f'{ed + timedelta(days=1)}T00:00:00',
|
||||
},
|
||||
'MergedFreeBusyIntervalInMinutes': 30,
|
||||
'RequestedView': 'DetailedMerged',
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
try:
|
||||
data = client.request("GetUserAvailability", payload)
|
||||
except Exception as e:
|
||||
return json.dumps({"error": str(e)})
|
||||
|
||||
body = data.get('Body', {})
|
||||
if 'ErrorCode' in body:
|
||||
return json.dumps({"error": body.get('FaultMessage', 'Unknown error')})
|
||||
|
||||
# Parse availability responses
|
||||
all_busy = []
|
||||
attendee_info = []
|
||||
freebusy_responses = body.get('FreeBusyResponseArray', [])
|
||||
|
||||
for i, fb_resp in enumerate(freebusy_responses):
|
||||
fb_view = fb_resp.get('FreeBusyView', {})
|
||||
merged_fb = fb_view.get('MergedFreeBusy', '')
|
||||
email = email_list[i] if i < len(email_list) else f"Person {i+1}"
|
||||
|
||||
if merged_fb:
|
||||
start_time = datetime.combine(sd, datetime.min.time())
|
||||
busy_periods = _parse_freebusy_string(merged_fb, start_time)
|
||||
|
||||
busy_count = sum(1 for c in merged_fb if c != '0')
|
||||
free_count = sum(1 for c in merged_fb if c == '0')
|
||||
attendee_info.append({
|
||||
"email": email,
|
||||
"busy_slots": busy_count,
|
||||
"free_slots": free_count,
|
||||
})
|
||||
|
||||
all_busy.extend(busy_periods)
|
||||
else:
|
||||
# Fallback: parse CalendarEventArray
|
||||
cal_events_raw = fb_view.get('CalendarEventArray', {})
|
||||
cal_events = cal_events_raw.get('Items', []) if isinstance(cal_events_raw, dict) else (cal_events_raw if isinstance(cal_events_raw, list) else [])
|
||||
if cal_events:
|
||||
attendee_info.append({
|
||||
"email": email,
|
||||
"calendar_events": len(cal_events),
|
||||
})
|
||||
for event in cal_events:
|
||||
start_str = event.get('StartTime', '')
|
||||
end_str = event.get('EndTime', '')
|
||||
if start_str and end_str:
|
||||
try:
|
||||
start = datetime.fromisoformat(start_str.replace('Z', '+00:00'))
|
||||
end = datetime.fromisoformat(end_str.replace('Z', '+00:00'))
|
||||
all_busy.append((start, end))
|
||||
except Exception:
|
||||
pass
|
||||
else:
|
||||
attendee_info.append({
|
||||
"email": email,
|
||||
"status": "no_data",
|
||||
})
|
||||
|
||||
merged_busy = _merge_busy_periods(all_busy)
|
||||
|
||||
# Find free slots for each weekday in range
|
||||
free_by_date = {}
|
||||
current_date = sd
|
||||
while current_date <= ed:
|
||||
if current_date.weekday() < 5: # Skip weekends
|
||||
free = _find_free_slots(
|
||||
merged_busy, current_date,
|
||||
start_hour, end_hour, duration_minutes,
|
||||
)
|
||||
if free:
|
||||
free_by_date[str(current_date)] = [
|
||||
{
|
||||
"start": _format_time(s),
|
||||
"end": _format_time(e),
|
||||
"duration_minutes": int((e - s).total_seconds() / 60),
|
||||
}
|
||||
for s, e in free
|
||||
]
|
||||
current_date += timedelta(days=1)
|
||||
|
||||
result = {
|
||||
"period": {"start": str(sd), "end": str(ed)},
|
||||
"attendees": attendee_info,
|
||||
"free_slots": free_by_date,
|
||||
}
|
||||
|
||||
if resolve_errors:
|
||||
result["unresolved"] = resolve_errors
|
||||
|
||||
return json.dumps(result, ensure_ascii=False)
|
||||
Reference in New Issue
Block a user