public override bool Equals(object?obj)
{
if (obj is TeamsParticipant participant)
{
var result = Mri?.Equals(participant.Mri, StringComparison.InvariantCultureIgnoreCase) ?? false;
if (!result)
{
// check IDs but only if they are GUIDs
result = (Id?.Equals(participant.Id, StringComparison.InvariantCultureIgnoreCase) ?? false) && IdIsGuid && participant.IdIsGuid;
}
return(result);
}
return(base.Equals(obj));
}
public TeamsParticipant(string?mri)
{
IsValid = false;
if (mri != null)
{
// remove contact url part (e.g. "https://emea.ng.msg.teams.microsoft.com/v1/users/ME/contacts/")
Mri = Regex.Replace(mri.Trim(), ContactUrlPattern, "");
}
else
{
Mri = null;
}
// sample for skypeId contained: 8:orgid:00000000-0000-beef-0000-000000000000;skypeid=orgid:00000000-0000-beef-0000-000000000000
if ((Mri?.ToLowerInvariant().Contains(";skype") ?? false) && ((!Mri?.ToLowerInvariant().EndsWith("skype")) ?? false))
{
//Debugger.Break(); <-- enable to discover potentially unknown ID formats
}
Prefix = "";
IdIsGuid = false;
Kind = ParticipantKind.Unknown;
Id = Mri;
if (!string.IsNullOrEmpty(Id))
{
var mriMatches = Regex.Matches(Id, MriPatternClosed); // use closed pattern, otherwise chat IDs would match partially
if (mriMatches.Count > 0)
{
// type is 8, 28 etc.; can be missing
var participantType = mriMatches[0].Groups["type"].ToString();
// subtype is "orgid", "teamsvisitor" etc.; can be empty
// var participantSubType = mriMatches[0].Groups["subtype"].ToString();
Id = mriMatches[0].Groups["id"].ToString();
Prefix = mriMatches[0].Groups["prefix"].ToString();
// without prefix we only accept GUIds, no arbitrary strings; WITH prefix the id can be an arbitrary string
IdIsGuid = Regex.Match(Id, GuidPattern).Success;
if (!string.IsNullOrWhiteSpace(participantType) || IdIsGuid)
{
IsValid = true;
}
switch (participantType)
{
case "4": // phone
case "8":
Kind = ParticipantKind.User;
break;
case "19":
Kind = ParticipantKind.TeamsChat;
break;
case "28":
Kind = ParticipantKind.AppOrBot;
break;
case "48":
Kind = ParticipantKind.Notification;
break;
default:
Kind = ParticipantKind.Unknown;
break;
}
}
if (Kind == ParticipantKind.Unknown)
{
// still unknown? let's see
// something like "19:[email protected]"
if (Mri?.StartsWith("19:") ?? false)
{
Kind = ParticipantKind.TeamsChat;
IsValid = true;
}
else if ((mri?.StartsWith("48:") ?? false) || (mri?.Contains("contacts/28:") ?? false))
{
// something like "https://notifications.skype.net/v1/users/ME/conversations/48:notifications" - not sure if this is possible as sender, but it exists
Kind = ParticipantKind.Notification;
}
}
}
}
