A ruby script to upload any file on any slack channel.

slack-uploader.rb

require 'rest-client'
require 'json'
require 'byebug'

def upload
  options = {
    # Slack channel webhook integration token
    token: '123456789-xxxaaaddffggbbb',
    file: File.new("error_hotels.csv", 'rb'),
    filename: "error_hotels.csv",
    title: "Error Hotels",
    # Slack Channel access token
    channels: 'D4CJJRAH5'
  }

  res = RestClient.post 'https://slack.com/api/files.upload', options
  byebug
  # Return the uploaded file's ID
  JSON.parse(res.body)["file"]["id"]
end

upload()