Restore the file creation and modification timestamps using the Dropbox API after the Dropbox client app throws them away

fix_mtime.rb

#!/usr/bin/env ruby
require 'yaml'
require 'time'

APP_KEY = "your app key"
APP_SECRET = "your app secret"
TOKEN_KEY = nil
TOKEN_SECRET = nil

lib = File.expand_path("../dropbox-sdk/lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'dropbox_sdk'

ACCESS_TYPE = :dropbox
session = DropboxSession.new(APP_KEY, APP_SECRET)

if TOKEN_KEY
  session.set_access_token(TOKEN_KEY, TOKEN_SECRET)
else
  session.get_request_token
  system "open", session.get_authorize_url
  puts "waiting for authorization..."
  until token = (session.get_access_token rescue nil)
    print "."; sleep 2
  end
  puts "here's your token info:"
  p token
  puts "copy the token key and secret into the script and run it"
end

client = DropboxClient.new(session, ACCESS_TYPE)
metadata = client.metadata('/Paperwork/Unsorted')
files = metadata["contents"]

files.each do |file|
  timestr = dbtime(file["client_mtime"])
  client_time = Time.strptime(timestr, "%a, %d %b %Y %H:%M:%S %z")
  path = File.expand_path(File.join("~/Dropbox", file["path"]))
  touchtime = client_time.strftime("%Y%m%d%H%M")
  cmd = %|touch -t #{touchtime} "#{path}"|
  p cmd
  system cmd
end