Upload file in Sinatra

trivial_file_upload_service.rb

require 'rubygems'
require 'sinatra'

require 'fileutils'

# upload with:
# curl -v -F "data=@/path/to/filename"  http://localhost:4567/user/filename
# or just go to http://localhost:4567/user/filename with a browser

get '/:name/:filename' do
  erb :form
end

post '/:name/:filename' do
  userdir = File.join("files", params[:name])
  FileUtils.mkdir_p(userdir)
  filename = File.join(userdir, params[:filename])
  datafile = params[:data]
#  "#{datafile[:tempfile].inspect}\n"
  File.copy(datafile[:tempfile], filename)
  #File.open(filename, 'wb') do |file|
  #  file.write(datafile[:tempfile].read)
  #end
  "wrote to #{filename}\n"
end


use_in_file_templates!

__END__

@@ form
<form action="" method="post" enctype="multipart/form-data">
  <p>
    <label for="file">File:</label>
    <input type="file" name="file">
  </p>

  <p>
    <input name="commit" type="submit" value="Upload" />
  </p>
</form>

It's a little different between Sinatra and Rails. In Ruby On Rails, we would access the tempfile by datafile.tempfile; on the other hand, we should use a hash to access it in Sinatra.

There's a naming inconsistency - the file is in params[:file] with the markup you have