CODEWITHSUNDEEP
c#slack-api
JumpIntoTheWater
JumpIntoTheWater

Reputation: 1336

image attachment with chat.postMessage - Slack API

I'm trying to use chat.postMesage with Slack's API but can't send an attachment as part of the message. I thought I can use image_url as part of the attachment object in order to show an image as part of my message.

I'm not getting any error in the response but either don't see any attachment. The message is being posted but no attachments at all.

Here's what I'm trying to do 

public async Task<string>  PostMessage()
{
    var response = string.Empty;

    var slacAttributes = new stackAttributes
    {
        channel = "testapp",
        text = $" {DateTime.Now} > {Environment.NewLine} Good Morning all!!!{Environment.NewLine} new line",
        attachments = new slackAttachments { fallback = "exception", text = "image text",title="kuku", image_url = "https://i.imgur.com/jO9N3eJ.jpg" }
    };

    try
    {
        using (var client = new HttpClient())
    {
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "xoxp-927360717313-937536168112-927367533025-c1065234477a3de10257bc69f523f789");
            var atttrJson = slacAttributes;
        var json = new JavaScriptSerializer().Serialize(atttrJson);
        var buffer = System.Text.Encoding.UTF8.GetBytes(json);
        var byteContent = new ByteArrayContent(buffer);
        byteContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        HttpResponseMessage result =  await client.PostAsync("https://slack.com/api/chat.postMessage", byteContent);
        if(result.IsSuccessStatusCode)
        {
            var content = await result.Content?.ReadAsByteArrayAsync();
            response = Encoding.UTF8.GetString(content, 0, content.Length);
        }
    }
    }
    catch(Exception e)
    {
        throw new Exception($"An error occured while Posting to slack.{e}");
    }

    return response;  
}

Upvotes: 3

Views: 1821

Answers (1)

Erik Kalkoken
Erik Kalkoken

Reputation: 32757

The attachments property has to be an array of attachment objects. From your code it looks like you are only providing a single attachment object, but not an array.

Upvotes: 1

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