I'm trying to create a bot that can book meetings. In order to do that i need to access the calendar of an employee to get FreeBusy info to ultimately book a meeting. I'm trying to avoid hardcoding the email and password and for that I want to use an access token from Azure AD to call EWS. I set the properties for
public static ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
using this method:
public static async System.Threading.Tasks.Task UseExchangeService(IDialogContext context, string userEmailAddress, SecureString userPassword)
{
string authority = ConfigurationManager.AppSettings["authority"];
string clientID = ConfigurationManager.AppSettings["clientID"];
string resource = ConfigurationManager.AppSettings["resource"];
string appKey = ConfigurationManager.AppSettings["appkey"];
AuthenticationContext authenticationContext = new AuthenticationContext(authority, false);
ClientCredential clientCred = new ClientCredential(clientID, appKey);
AuthenticationResult authenticationResult = await authenticationContext.AcquireTokenAsync(resource, clientCred);
service.Url = new Uri(ConfigurationManager.AppSettings["serverName"] + "/ews/exchange.asmx");
service.TraceEnabled = true;
service.TraceFlags = TraceFlags.All;
service.Credentials = new OAuthCredentials(authenticationResult.AccessToken);
// USING THIS LINE IT WORKS FINE!
// service.Credentials = new NetworkCredential(userEmailAddress, userPassword); // VIRKER
}
I do get the access token from Azure AD and I have granted the permission for the application in Azure AD.
I use this method to extract the freebusytimes, it contains other more code to display the times as buttons on a herocard, but this is the call to EWS:
List<AttendeeInfo> attendees = new List<AttendeeInfo>();
attendees.Add(new AttendeeInfo()
{
SmtpAddress = "MyEMAIL",
AttendeeType = MeetingAttendeeType.Organizer
});
attendees.Add(new AttendeeInfo()
{
SmtpAddress = BookersEmail,
AttendeeType = MeetingAttendeeType.Required
});
//DateTime date1 = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day.Ad, 7, 0, 0)
// Specify options to request free/busy information and suggested meeting times.
AvailabilityOptions availabilityOptions = new AvailabilityOptions();
availabilityOptions.GoodSuggestionThreshold = 49;
availabilityOptions.MaximumNonWorkHoursSuggestionsPerDay = 0;
availabilityOptions.MaximumSuggestionsPerDay = 20;
// Note that 60 minutes is the default value for MeetingDuration, but setting it explicitly for demonstration purposes.
availabilityOptions.MeetingDuration = 60;
availabilityOptions.MinimumSuggestionQuality = SuggestionQuality.Excellent;
//TimeWindow hej = new TimeWindow();
DateTime StartDay = DateTime.Now.AddDays(1);
TimeSpan ts = new TimeSpan(9, 0, 0);
DateTime StartTime = StartDay.Date + ts;
availabilityOptions.DetailedSuggestionsWindow = new TimeWindow(StartTime, DateTime.Now.AddDays(4));
availabilityOptions.RequestedFreeBusyView = FreeBusyViewType.FreeBusy;
// Return free/busy information and a set of suggested meeting times.
// This method results in a GetUserAvailabilityRequest call to EWS.
GetUserAvailabilityResults results = service.GetUserAvailability(attendees,
availabilityOptions.DetailedSuggestionsWindow,
AvailabilityData.FreeBusyAndSuggestions,
availabilityOptions);
I have created the application in Azure AD and I have granted the following permissions: Office 365 Exchange Online:
Use Exchange Web Services with full access to all mailboxes
Read and write calendars in all mailboxes
Read and write user and shared calendars
Access mailboxes as the signed-in user via Exchange Web Services
I've tried other answers i found on stackoverflow, however they do not do the trick for me. Hope You can help
