Curl `-T/--upload-file` in Faraday

I had a bit of trouble trying to find docs on how to do a curl --upload-file request with ruby. This flag is a special flag that tells curl to generate a PUT request with the body being the file(s) to upload to the remote server.

In my case, I wanted to upload a single file, and I accomplished this with the faraday and faraday-multipart gem:

require 'faraday'
require 'faraday-multipart'

conn = Faraday.new("https://example.com") do |f|
  f.request :multipart
end

upload_file = File.open("./path/to/image.jpg")

conn.put("/file-upload") do |req|
  req['Content-Type'] = 'image/jpeg'
  req['Content-Length'] = upload_file.size.to_s
  req.body = Faraday::Multipart::FilePart.new(
    upload_file,
    'image/jpeg'
  )
end

Part of the magic here is that you need to explicitly set the Content-Type and the Content-Length header.

https://github.com/lostisland/faraday-multipart