file uploader because i'm too lazy to figure out how to make my phone talk to my computer

sinatra_app.rb

require 'sinatra'
require 'base64'

set :environment, :production

get '/' do
  html = '
    <form action="run" method="POST" enctype="multipart/form-data">
      <input type="file" name="file" accept="image/*" capture="camera">
      <input type="submit" value="Upload image">
    </form>
  '
end

post '/run' do
  filename = params[:file][:filename]
  file = params[:file][:tempfile]

  File.open(filename, 'wb') do |f|
    f.write(file.read)
  end
  
  redirect to('/')
end