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Uploading Image Files to Slack Using Incoming Webhooks by Google Apps Script

Uploading Image Files to Slack Using Incoming Webhooks by Google Apps Script

This sample script is for uploading image files to Slack using Incoming Webhooks by Google Apps Script.

When users try to upload image files to Slack using Incoming Webhooks, it has been known that although the access token is required to directly upload them, Incoming Webhooks can upload them by using the tag of image_url. In this sample script, it uploads image files (BMP, GIF, JPEG and PNG) on Google Drive to Slack using Incoming Webhooks. The script is written by Google Apps Script.

In this sample, It supposes that there are image files on Google Drive.

Script :

var fileId = "#####"; // File ID of image file
var url = "https://hooks.slack.com/services/#####"; // Incoming Webhooks URL retrieved at Slack

var file = DriveApp.getFileById(fileId);
file.setSharing(DriveApp.Access.ANYONE_WITH_LINK, DriveApp.Permission.VIEW);
var res = UrlFetchApp.fetch(url, {
  method: "post",
  payload: JSON.stringify({
    "channel":"#####", // Channel name or channel ID
    "username":"Sample Image",
    "text":"Sample Text",
    "attachments":[{
      "image_url": "http://drive.google.com/uc?export=download&id=" + fileId
    }]
  }),
  muteHttpExceptions: true
});
Utilities.sleep(3000);
file.setSharing(DriveApp.Access.PRIVATE, DriveApp.Permission.NONE);

Note :

  1. Modify permission of the image file to Access.ANYONE_WITH_LINK and Permission.VIEW.
  2. Make Slack download the image file from Google Drive by post request.
  3. Wait for 3 seconds until the download is finished.
  4. Undo the permission of the image file to Access.PRIVATE and Permission.NONE.

About uploading image file to Slack, when the upload was finished, even if the image file on Google Drive is removed, the image file on Slack is not removed.

@Skynetpedro

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@Skynetpedro Skynetpedro commented Jul 15, 2020

Hi Kanshi. Thanks for sharing this. It is very useful for me. Am trying to get it to work.

The download of the image from Google Drive does not seem to work. I have tried longer waiting times to allow download to finish.

Has been a couple of years since this post. Not sure if anything has changed or if I don't understand concept fully.

Interesting, the preview image shows on the slack channel but when I click on the image I get the attached image.

Any guidance is much appreciated. Sorry to bother on this.

Thanks.
Pete

no image

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