base64 to file in rails

base64_to_file.rb

module Base64ToFile
  extend ActiveSupport::Concern

  def base64_to_file(base64_data, filename=nil)
    return base64_data unless base64_data.is_a? String
    
    start_regex = /data:image\/[a-z]{3,4};base64,/
    filename ||= SecureRandom.hex

    regex_result = start_regex.match(base64_data)
    if base64_data && regex_result
      start = regex_result.to_s
      tempfile = Tempfile.new(filename)
      tempfile.binmode
      tempfile.write(Base64.decode64(base64_data[start.length..-1]))
      uploaded_file = ActionDispatch::Http::UploadedFile.new(
        :tempfile => tempfile,
        :filename => "#{filename}.jpg",
        :original_filename => "#{filename}.jpg"
      )

      uploaded_file
    else
      nil
    end
  end

end

  def base64_to_file(base64_data)
    return base64_data unless base64_data.is_a? String

    regex = /data:image\/([a-z]{3,4});base64,([a-zA-Z0-9=]*)/
    type, image = base64_data.scan(regex)[0]
    return unless type && image

    filename = "#{SecureRandom.hex}.#{type}"
    tempfile = Tempfile.new(filename)
    tempfile.binmode
    tempfile.write(Base64.decode64(image))

    ActionDispatch::Http::UploadedFile.new(
      tempfile: tempfile,
      filename: filename,
      original_filename: filename
    )
  end

not working

It worked for me this way:
My gist link

def base64_to_file(base64_data, filename = 'image')
  return base64_data unless base64_data.present? && base64_data.is_a?(String)

  regex = /data:image\/([a-z]{3,4});base64,/
  type_fetch_regex = /\/(.*?);/
  start_text = regex.match(base64_data)
  type = base64_data[type_fetch_regex, 1]
  if start_text && type
    file = File.new("#{filename}.#{type}", 'wb')
    file.write(Base64.decode64(base64_data[start_text.to_s.length..-1]))
  else
    nil
  end
end