Office365 slack bot

Currently it only updates peoples slack statuses when they are in a meeting (via Outlook Calendar). But many features can be added in the future.

Requirements

The settings class must be set with various these parameters:

public class Options
{
    public string SlackAppToken { get; set; }
    public string SlackAuthToken { get; set; }

    public string MsGraphScopes { get; set; }
    public string MsGraphClientId { get; set; }
    public string MsGraphRedirectUri { get; set; }
    public string MsGraphClientSecret { get; set; }

    public bool UseCalendarSubject { get; set; }
}

How it works

Registration

1. User registers via slack command /register me within any Slack channel.
2. Server responds with an OAuth2 authentcation flow URL (only valid for 2 min)
3. User is asked to consent to permissions needed by the bot (user.read calendars.read)
4. Then the user is redirected to the server, and the server stores a correlation between the Slack id and Office365 id (token).
5. A message is then sent back to the Slack channel the user started within, with information about success/failure etc.

A user can unregister at any time by using /unregister me from any slack channel

Slack status

1. The CalendarService continously checks all upcoming calendar events for registered users

   • It automatically checks if a token is expired and re-authenticates that user.
   • Queues up a new Slack status update in the database for calendar events where the user is either an organizer or is attending.

2. The SlackService continously checks for queued tasks (with a given interval)

   • Invalidates all tasks that are old and deletes them (based on time)
   • If a meeting is starting in one minute or is started it queues up the Status update

Limitations

The current code only supports one Slack org per instance as of now.

TODOS

• Dequeue all pending tasks if user unregisters
• Ability to specify which DB to store data in
• Support multiple Slack Orgs (so that Mikael can sell it)
• Subscribe to MsGraph change notifications (some people create meetings right before a meeting).