/// <summary>
/// Processess an incoming activity and if it is for MsTeams attaches <see cref="ITeamsContext"/> instances along with the context.
/// </summary>
/// <param name="context">The context object for this turn.</param>
/// <param name="nextDelegate">The delegate to call to continue the bot middleware pipeline.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>
/// Task tracking operation.
/// </returns>
/// <remarks>
/// Middleware calls the <paramref name="nextDelegate" /> delegate to pass control to
/// the next middleware in the pipeline. If middleware doesn’t call the next delegate,
/// the adapter does not call any of the subsequent middleware’s request handlers or the
/// bot’s receive handler, and the pipeline short circuits.
/// <para>The <paramref name="context" /> provides information about the
/// incoming activity, and other data needed to process the activity.</para>
/// </remarks>
/// <seealso cref="ITurnContext" />
/// <seealso cref="Schema.IActivity" />
public async Task OnTurnAsync(ITurnContext context, NextDelegate nextDelegate, CancellationToken cancellationToken = default(CancellationToken))
{
BotAssert.ContextNotNull(context);
if (context.Activity.ChannelId.Equals(Channels.Msteams, StringComparison.OrdinalIgnoreCase))
{
// BotFrameworkAdapter when processing activity, post Auth adds BotIdentity into the context.
ClaimsIdentity claimsIdentity = context.TurnState.Get <ClaimsIdentity>("BotIdentity");
// If we failed to find ClaimsIdentity, create a new AnonymousIdentity. This tells us that Auth is off.
if (claimsIdentity == null)
{
claimsIdentity = new ClaimsIdentity(new List <Claim>(), "anonymous");
}
ITeamsConnectorClient teamsConnectorClient = await this.CreateTeamsConnectorClientAsync(context.Activity.ServiceUrl, claimsIdentity).ConfigureAwait(false);
context.TurnState.Add((ITeamsContext) new TeamsContext(context, teamsConnectorClient));
}
await nextDelegate(cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Initializes a new instance of the <see cref="TeamsContext"/> class.
/// </summary>
/// <param name="turnContext">Turn context created by adapter and sent over through middlewares.</param>
/// <param name="teamsConnectorClient">Teams connector client instance.</param>
internal TeamsContext(ITurnContext turnContext, ITeamsConnectorClient teamsConnectorClient)
{
this.turnContext = turnContext;
this.teamsConnectorClient = teamsConnectorClient;
}