JoinInfo.cs

// <copyright file="JoinInfo.cs" company="Microsoft Corporation">
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
// </copyright>

namespace Sample.Common.Meetings
{
    using System;
    using System.IO;
    using System.Net;
    using System.Runtime.Serialization;
    using System.Runtime.Serialization.Json;
    using System.Text;
    using System.Text.RegularExpressions;
    using Microsoft.Graph;

    /// <summary>
    /// Gets the join information.
    /// </summary>
    public class JoinInfo
    {
        /// <summary>
        /// Parse Join URL into its components.
        /// </summary>
        /// <param name="joinURL">Join URL from Team's meeting body.</param>
        /// <returns>Parsed data.</returns>
        public static (ChatInfo, MeetingInfo) ParseJoinURL(string joinURL)
        {
            var decodedURL = WebUtility.UrlDecode(joinURL);

            //// Long URL format:
            //// https://teams.microsoft.com/l/meetup-join/19:cd9ce3da56624fe69c9d7cd026f9126d@thread.skype/1509579179399?context={"Tid":"72f988bf-86f1-41af-91ab-2d7cd011db47","Oid":"550fae72-d251-43ec-868c-373732c2704f","MessageId":"1536978844957"}

            var regex = new Regex("https://teams\\.microsoft\\.com.*/(?<thread>[^/]+)/(?<message>[^/]+)\\?context=(?<context>{.*})");
            var match = regex.Match(decodedURL);
            if (match.Success)
            {
                using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(match.Groups["context"].Value)))
                {
                    var ctxt = (Context)new DataContractJsonSerializer(typeof(Context)).ReadObject(stream);
                    var chatInfo = new ChatInfo
                    {
                        ThreadId = match.Groups["thread"].Value,
                        MessageId = match.Groups["message"].Value,
                        ReplyChainMessageId = ctxt.MessageId,
                    };

                    var meetingInfo = new OrganizerMeetingInfo
                    {
                        Organizer = new IdentitySet
                        {
                            User = new Identity { Id = ctxt.Oid },
                        },
                    };
                    meetingInfo.Organizer.User.SetTenantId(ctxt.Tid);

                    return (chatInfo, meetingInfo);
                }
            }

            //// Short URL format:
            //// https://teams.microsoft.com/meet/2414128301281?p=NzhDLMLT8b07DrkwkE
            var shortUrlRegex = new Regex("https://teams\\.microsoft\\.com/meet/(?<meetingId>[^?]+)\\?p=(?<passcode>.+)");
            var shortUrlMatch = shortUrlRegex.Match(decodedURL);
            if (shortUrlMatch.Success)
            {
                var meetingInfo = new JoinMeetingIdMeetingInfo
                {
                    JoinMeetingId = shortUrlMatch.Groups["meetingId"].Value,
                    Passcode = shortUrlMatch.Groups["passcode"].Value,
                };

                return (new ChatInfo(), meetingInfo);
            }

            throw new ArgumentException($"Join URL cannot be parsed: {joinURL}.", nameof(joinURL));
        }

        /// <summary>
        /// Join URL context.
        /// </summary>
        [DataContract]
        private class Context
        {
            /// <summary>
            /// Gets or sets the Tenant Id.
            /// </summary>
            [DataMember]
            public string Tid { get; set; }

            /// <summary>
            /// Gets or sets the AAD object id of the user.
            /// </summary>
            [DataMember]
            public string Oid { get; set; }

            /// <summary>
            /// Gets or sets the chat message id.
            /// </summary>
            [DataMember]
            public string MessageId { get; set; }
        }
    }
}