Public Access
Implement meeting assistant v1
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@@ -0,0 +1,289 @@
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using System.Runtime.InteropServices;
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namespace MeetingAssistant.MeetingNotes;
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public sealed class OutlookClassicMeetingMetadataProvider : IMeetingMetadataProvider
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{
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private const int OutlookCalendarFolder = 9;
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private readonly ILogger<OutlookClassicMeetingMetadataProvider> logger;
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public OutlookClassicMeetingMetadataProvider(ILogger<OutlookClassicMeetingMetadataProvider> logger)
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{
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this.logger = logger;
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}
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public Task<MeetingMetadata?> GetCurrentMeetingAsync(
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DateTimeOffset startedAt,
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CancellationToken cancellationToken)
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{
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cancellationToken.ThrowIfCancellationRequested();
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try
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{
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return Task.FromResult(GetCurrentMeeting(startedAt));
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}
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catch (Exception exception) when (exception is not OperationCanceledException)
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{
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logger.LogDebug(exception, "Outlook Classic meeting metadata was not available");
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return Task.FromResult<MeetingMetadata?>(null);
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}
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}
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private MeetingMetadata? GetCurrentMeeting(DateTimeOffset startedAt)
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{
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object? application = null;
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object? session = null;
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object? calendar = null;
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object? items = null;
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object? restrictedItems = null;
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try
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{
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var applicationType = Type.GetTypeFromProgID("Outlook.Application");
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if (applicationType is null)
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{
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return null;
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}
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application = Activator.CreateInstance(applicationType);
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if (application is null)
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{
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return null;
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}
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session = GetProperty(application, "Session");
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calendar = Invoke(session!, "GetDefaultFolder", OutlookCalendarFolder);
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items = GetProperty(calendar!, "Items");
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SetProperty(items!, "IncludeRecurrences", true);
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Invoke(items!, "Sort", "[Start]");
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var startedLocal = startedAt.LocalDateTime;
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var windowStart = startedLocal.AddMinutes(-1);
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var windowEnd = startedLocal.AddMinutes(5);
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var filter =
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$"[Start] <= '{windowEnd:g}' AND [End] >= '{windowStart:g}'";
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restrictedItems = Invoke(items!, "Restrict", filter);
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var candidates = new List<OutlookAppointmentCandidate>();
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var count = Convert.ToInt32(GetProperty(restrictedItems!, "Count"));
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for (var index = 1; index <= count; index++)
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{
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var appointment = Invoke(restrictedItems!, "Item", index);
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if (appointment is not null && IsTeamsAppointment(appointment))
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{
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candidates.Add(new OutlookAppointmentCandidate(
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appointment,
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Convert.ToDateTime(GetProperty(appointment, "Start")),
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Convert.ToDateTime(GetProperty(appointment, "End"))));
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}
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else
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{
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ReleaseComObject(appointment);
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}
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}
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var selected = OutlookMeetingCandidateSelector.Select(
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candidates,
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startedLocal,
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candidate => candidate.Start,
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candidate => candidate.End);
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if (selected is null)
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{
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foreach (var candidate in candidates)
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{
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ReleaseComObject(candidate.Appointment);
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}
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return null;
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}
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try
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{
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var appointment = selected.Appointment;
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var title = Convert.ToString(GetProperty(appointment, "Subject")) ?? "";
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var attendees = ReadAttendees(appointment);
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var body = Convert.ToString(GetProperty(appointment, "Body")) ?? "";
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return new MeetingMetadata(
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title.Trim(),
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attendees,
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ExtractAgenda(body),
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ToLocalOffset(selected.End));
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}
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finally
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{
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foreach (var candidate in candidates)
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{
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ReleaseComObject(candidate.Appointment);
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}
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}
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}
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finally
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{
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ReleaseComObject(restrictedItems);
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ReleaseComObject(items);
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ReleaseComObject(calendar);
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ReleaseComObject(session);
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ReleaseComObject(application);
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}
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}
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internal static string ExtractAgenda(string body)
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{
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if (string.IsNullOrWhiteSpace(body))
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{
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return "";
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}
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var lines = body.Replace("\r\n", "\n", StringComparison.Ordinal).Replace('\r', '\n').Split('\n');
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var agendaLines = new List<string>();
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foreach (var line in lines)
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{
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if (IsTeamsSeparator(line) || IsTeamsJoinLine(line))
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{
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break;
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}
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agendaLines.Add(line);
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}
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return string.Join(Environment.NewLine, agendaLines).Trim();
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}
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private static bool IsTeamsAppointment(object appointment)
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{
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var subject = Convert.ToString(GetProperty(appointment, "Subject")) ?? "";
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var location = Convert.ToString(GetProperty(appointment, "Location")) ?? "";
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var body = Convert.ToString(GetProperty(appointment, "Body")) ?? "";
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return ContainsTeamsMarker(subject) ||
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ContainsTeamsMarker(location) ||
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ContainsTeamsMarker(body);
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}
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private static bool ContainsTeamsMarker(string value)
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{
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return value.Contains("teams.microsoft.com", StringComparison.OrdinalIgnoreCase) ||
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value.Contains("Microsoft Teams", StringComparison.OrdinalIgnoreCase) ||
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value.Contains("Join the meeting now", StringComparison.OrdinalIgnoreCase) ||
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value.Contains("Join Microsoft Teams Meeting", StringComparison.OrdinalIgnoreCase);
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}
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private static bool IsTeamsSeparator(string line)
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{
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var trimmed = line.Trim();
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return trimmed.Length >= 8 &&
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trimmed.All(character => character is '_' or '-' or '*' or ' ');
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}
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private static bool IsTeamsJoinLine(string line)
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{
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return ContainsTeamsMarker(line);
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}
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private static IReadOnlyList<string> ReadAttendees(object appointment)
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{
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var attendees = new List<string>();
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var organizer = Convert.ToString(GetProperty(appointment, "Organizer"));
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if (!string.IsNullOrWhiteSpace(organizer))
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{
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attendees.Add(organizer.Trim());
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}
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object? recipients = null;
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try
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{
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recipients = GetProperty(appointment, "Recipients");
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var count = Convert.ToInt32(GetProperty(recipients!, "Count"));
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for (var index = 1; index <= count; index++)
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{
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object? recipient = null;
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try
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{
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recipient = Invoke(recipients!, "Item", index);
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var formatted = FormatRecipient(recipient!);
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if (!string.IsNullOrWhiteSpace(formatted))
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{
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attendees.Add(formatted);
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}
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}
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finally
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{
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ReleaseComObject(recipient);
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}
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}
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}
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finally
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{
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ReleaseComObject(recipients);
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}
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return attendees
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.Where(attendee => !string.IsNullOrWhiteSpace(attendee))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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}
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private static DateTimeOffset ToLocalOffset(DateTime value)
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{
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return new DateTimeOffset(DateTime.SpecifyKind(value, DateTimeKind.Local));
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}
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private static string FormatRecipient(object recipient)
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{
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var name = Convert.ToString(GetProperty(recipient, "Name"))?.Trim() ?? "";
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var email = Convert.ToString(GetProperty(recipient, "Address"))?.Trim() ?? "";
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if (string.IsNullOrWhiteSpace(name))
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{
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return email;
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}
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if (string.IsNullOrWhiteSpace(email) ||
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email.Contains('/'))
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{
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return name;
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}
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return $"{name} <{email}>";
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}
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private static object? GetProperty(object target, string name)
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{
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return target.GetType().InvokeMember(
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name,
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System.Reflection.BindingFlags.GetProperty,
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null,
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target,
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null);
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}
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private static void SetProperty(object target, string name, object value)
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{
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target.GetType().InvokeMember(
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name,
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System.Reflection.BindingFlags.SetProperty,
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null,
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target,
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[value]);
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}
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private static object? Invoke(object target, string name, params object[] arguments)
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{
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return target.GetType().InvokeMember(
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name,
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System.Reflection.BindingFlags.InvokeMethod,
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null,
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target,
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arguments);
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}
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private static void ReleaseComObject(object? value)
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{
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if (value is not null && Marshal.IsComObject(value))
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{
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Marshal.FinalReleaseComObject(value);
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}
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}
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private sealed record OutlookAppointmentCandidate(
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object Appointment,
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DateTime Start,
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DateTime End);
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}
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