class RailsAssetsForUpyun

# File lib/rails-assets-for-upyun.rb, line 4
def self.publish(bucket, username, password, bucket_path="/", localpath='public', upyun_ap="http://v0.api.upyun.com")
  # http://stackoverflow.com/questions/357754/can-i-traverse-symlinked-directories-in-ruby-with-a-glob
  Dir[File.join localpath, "**{,/*/**}/*"].select{|f| File.file? f}.each do |file|
    
    url = URI.encode "/#{bucket}#{bucket_path}#{file[localpath.to_s.size + 1 .. -1]}"
    date = Time.now.httpdate
    size = RestClient.head("#{upyun_ap}#{url}", {\
        Authorization: "UpYun #{username}:#{signature 'HEAD', url, date, 0, password}", 
        Date: date}) do |response, request, result, &block|
      case response.code 
      when 200
        response.headers[:x_upyun_file_size].to_i
      when 404
        "non-exists"
      else
        response.return!(request, result, &block)
      end
    end
    if size == (file_size = File.size file)
      puts "skipping #{file}.."
    else
      file_content = File.read(file)
      puts "uploading #{size} => #{file_size} #{file}.."
      RestClient.put("#{upyun_ap}#{url}",  file_content,{\
        Authorization: "UpYun #{username}:#{signature 'PUT', url, date, file_size, password}", 
        Date: date,
        mkdir: 'true',
        Content_MD5: Digest::MD5.hexdigest(file_content),
        })
    end
  end
end

# File lib/rails-assets-for-upyun.rb, line 36
def self.signature(method, uri, date, content_length, password)
  Digest::MD5.hexdigest "#{method}&#{uri}&#{date}&#{content_length}&#{Digest::MD5.hexdigest password}"
end