protected async Task <bool> Respond(SlackRequest request, SlackResponse response)
{
var httpResponse = await HttpClient.SendAsync(new HttpRequestMessage {
RequestUri = new Uri(request.ResponseUrl),
Method = HttpMethod.Post,
Content = new StringContent(SerializeJson(response))
});
return(httpResponse.StatusCode == HttpStatusCode.OK);
}
protected async Task <bool> Respond(SlackRequest request, SlackResponse response)
{
var httpResponse = await HttpClient.SendAsync(new HttpRequestMessage {
RequestUri = new Uri(request.ResponseUrl),
Method = HttpMethod.Post,
Content = new StringContent(JsonConvert.SerializeObject(response), Encoding.UTF8, "application/json")
});
return(httpResponse.StatusCode == HttpStatusCode.OK);
}
//--- Methods ---
public async Task FunctionHandler(SlackRequest request, ILambdaContext context)
{
LambdaLogger.Log($"*** INFO: request received\n{JsonConvert.SerializeObject(request)}\n");
using (var consoleOutWriter = new StringWriter())
using (var consoleErrorWriter = new StringWriter()) {
var consoleOutOriginal = Console.Out;
var consoleErrorOriginal = Console.Error;
try {
// redirect the console output and error streams so we can emit them later to slack
Console.SetOut(consoleOutWriter);
Console.SetError(consoleErrorWriter);
// validate the slack token (assuming one was configured)
if (!(_slackVerificationToken?.Equals(request.Token) ?? true))
{
throw new SlackVerificationTokenMismatchException();
}
// handle slack request
await HandleMessageAsync(request);
} catch (Exception e) {
LambdaLogger.Log($"*** EXCEPTION: {e.ToString()}\n");
Console.Error.WriteLine(e);
} finally {
Console.SetOut(consoleOutOriginal);
Console.SetError(consoleErrorOriginal);
}
// send console output to slack as an in_channel response
var output = consoleOutWriter.ToString();
if (output.Length > 0)
{
await RespondInChannel(request, output);
}
// send console error to slack as an ephemeral response (only visible to the requesting user)
var error = consoleErrorWriter.ToString();
if (error.Length > 0)
{
await RespondEphemeral(request, error);
}
}
}
//--- Abstract Methods --- protected abstract Task ProcessSlackRequestAsync(SlackRequest request);
protected Task <bool> RespondEphemeral(SlackRequest request, string text, params SlackResponseAttachment[] attachments) => Respond(request, SlackResponse.Ephemeral(text, attachments));
protected Task <bool> RespondInChannel(SlackRequest request, string text, params SlackResponseAttachment[] attachments) => Respond(request, SlackResponse.InChannel(text, attachments));
//--- Abstract Methods --- protected abstract Task HandleMessageAsync(SlackRequest request);