ogs-sgf-downloader.js

require 'httparty'
require 'net/http'

player_id = 115095

folder_name = 'sgf-files'
Dir.mkdir(folder_name) unless Dir.exist?(folder_name)
Dir.chdir(folder_name)

class Player
  include HTTParty
  base_uri 'https://online-go.com/api/v1/players'

  def initialize player_id
    @player_id = player_id
  end

  def games page
    self.class.get("/#{@player_id}/games", query: {page: page, page_size: 200})
  end

  def game_ids page
    response = games(page)

    # relative links to all pages
    links = response['results'].map { |o| o['id'] }

    # next page number
    next_page = response['next'].nil? ? nil : (page+1)

    return links, next_page
  end
end

def save_game game_id, http
  file_name = "#{game_id}.sgf"
  if not File.exist? file_name
    File.open(file_name, 'wb') do |file|
      http.get("/api/v1/games/#{game_id}/sgf") do |str|
        file.write str
      end
    end

    # somewhat of a progress indicator
    print '.'
  else
    print '_'
  end
end

page = 1
player = Player.new(player_id)
Net::HTTP.start('online-go.com', 443, use_ssl: true) do |http|
  begin
    games, page = player.game_ids page

    # download SGF files
    games.each do |game_id|
      save_game game_id, http
    end
  end while page != nil
end