slackBot Poster Uploader

slackBot_PosterUploader.cs

private async void UploadPDF(byte[] pdfString, string channel_id, string user_name)
{
    using (var httpClient = new HttpClient())
    {
        HttpResponseMessage? response = null;
        var request = new HttpRequestMessage(new HttpMethod("POST"), "https://slack.com/api/files.upload");
        JsonElement JO = new JsonElement();

        request.Headers.TryAddWithoutValidation("Authorization", "Bearer XXXX");

        var multipartContent = new MultipartFormDataContent();
        multipartContent.Add(new ByteArrayContent(pdfString), "file", "XXXX.pdf");
        multipartContent.Add(new StringContent($"Hello, {user_name}. Here is your new tax information"), "initial_comment");
        multipartContent.Add(new StringContent(channel_id, System.Text.Encoding.UTF8), "channels");
        request.Content = multipartContent;

        try
        {
            var e = await httpClient.SendAsync(request);
            var content = e.Content.ReadAsStringAsync().Result;
            LambdaLogger.Log("PDF upload process result: " + content);
        }
        catch (Exception ex)
        {
            LambdaLogger.Log("PDF upload process failed, retrying: " + ex.Message);
            UploadPDF(pdfString, channel_id, user_name);
        }
    }
}