Unable to upload a file in a direct message using files.completeUploadExternal about bolt-js HOT 7 CLOSED

@theshdb totally understand, and I mirror your sentiment and I have raised it internally. However, I am only one voice internally and many considerations go into what we do or do not do with the APIs. Priority and product decisions are made by leadership above my paygrade, unfortunately, however, leadership does pay attention to customer feedback that comes in via emails to [email protected]. Please consider emailing there and telling them you have a feature request / complaint about the deprecated API and what you'd like to see as a customer with regards to the new API.

As for retrieving the DM ID, you can use the conversations.open API and provide the U.... encoded user ID as part of the users argument. That should return a payload that looks like:

{
    "ok": true,
    "no_op": true,
    "already_open": true,
    "channel": {
        "id": "D05TKNSGFL3"
    }
}

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Thanks for the clarification @filmaj. I'm aware of this functionality. However, my concern is that the deprecated method files.upload allowed us to use Slack userId to post a file in a direct message. So, why are we no longer supporting it in the new API? Can we not update the regex to include U?

If no, then is it possible to retrieve a direct message ID using the Slack user ID via an API?

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Got it @filmaj. Thanks for providing the solution on how to get the direct message ID.

This is what I'm using now as an alternate solution to post a file to a DM using a Slack user ID.

if (channelId.startsWith("U")) {
          const conversationsResponse = await web.conversations.open({
            users: channelId,
          });
          channelId = conversationsResponse.channel.id;
        }

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Great, glad you got it working. I will close this issue now but if there are any more questions here feel free to re-open or file a new issue.

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Have you tried using the encoded D1234ABCD direct message ID instead of the U1234ABCD user ID to the channels list? As the error states, it does not allow passing user IDs into channel_id; this parameter only accepts encoded IDs for public channels , group and direct msgs (IDs that start with C, G, D and Z).

In the Slack client, if you click on a direct message header's user name and scroll all the way down, you should be able to find the D... encoded ID for a direct message that this API accepts:

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@filmaj I got some problems I have upload the file to the server succeed,but I can not see the files in my channel. I have added the channel ID in my UploadPayload but it still didn't work

    // Step 2: Upload file
    using (var fileStream = new FileStream(screenshotPath, FileMode.Open, FileAccess.Read))
    {
        var fileContent = new StreamContent(fileStream);
        fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

        var uploadFileContent = new MultipartFormDataContent();
        uploadFileContent.Add(fileContent, "file", fileName);

        LogToFile($"上傳檔案的請求 URL: {uploadUrl}");

        var uploadResponse = await client.PutAsync(uploadUrl, uploadFileContent);
        var uploadResponseContent = await uploadResponse.Content.ReadAsStringAsync();
        if (!uploadResponse.IsSuccessStatusCode)
        {
            return;
        }
    }

    // Step 3: Complete Upload
    var completeUploadPayload = new
    {
        files = new[]
        {
    new
    {
        id = fileId,
        title = fileName
    }
},
        channel_id = "C076Q68GWTY"
    };

    var completeUploadPayloadJson = JsonConvert.SerializeObject(completeUploadPayload);
    var completeUploadContent = new StringContent(completeUploadPayloadJson, Encoding.UTF8, "application/json");

    var completeUploadResponse = await client.PostAsync("https://slack.com/api/files.completeUploadExternal", completeUploadContent);
    var completeUploadResponseContent = await completeUploadResponse.Content.ReadAsStringAsync();
    dynamic completeUploadResult = JsonConvert.DeserializeObject(completeUploadResponseContent);

    if (completeUploadResult.ok == false)
    {
        return;
    }

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@william84531 The files should be shared in the channel members by the API call, but it's not visible because you haven't posted a message with them. You can add "initial_comment" parameter in addition to "channel_id" for posting a message with files.

If that's not the case, a different factor might be causing the issue. If so, I'd suggest trying any of the official Node/Python/Java SDKs first and then checking the difference in your C# code.

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