bgg_common_games.rb

# Find common games between users on BGG

require 'excon'
require 'awesome_print'
require 'oga'
require 'getopt/long'
require 'cgi'

# Looks like BGG redirects to non-www url's sometimes
Excon.defaults[:middlewares] << Excon::Middleware::RedirectFollower

# If this fails with a 302, try "https://boardgamegeek.com/xmlapi2/collection"
url = "https://www.boardgamegeek.com/xmlapi2/collection"

# e.g. ruby common_games.rb --user1 djberg96 --user2 jameycribbs
opts = Getopt::Long.getopts(
  ["--user1", "-u", Getopt::OPTIONAL],
  ["--user2", "-z", Getopt::REQUIRED],
  ["--debug", "-d", Getopt::BOOLEAN]
)

# Put real user id's here
user1 = opts['user1'] || "djberg96"
user2 = opts['user2']

if user2.nil? || user2.size.zero?
  $stderr.puts "Please specify a user to compare with using the -z option"
  exit
end

puts "Comparing #{user1} and #{user2}"

connection = Excon.new(url, :persistent => true)
response1 = connection.get(:query => {:username => user1, :own => 1})
response2 = connection.get(:query => {:username => user2, :own => 1, :persistent => false}) # close socket server-side

# Sleep 30 seconds and try one more time on a 202 (accepted) response.
# There's no time estimate provided in response, we have to guess.

if response1.status == 202
  puts "BGG is building the collection for #{user1}. Waiting 30 seconds to try again."
  sleep 30
  response1 = Excon.get(url, :query => {:username => user1, :own => 1})
end

if response1.status > 399
  $stderr.puts "Looks like something went wrong, got #{response.status} status from server"
  exit
end

if response2.status == 202
  puts "BGG is building the collection for #{user2}. Waiting 30 seconds to try again."
  sleep 30
  response2 = Excon.get(url, :query => {:username => user2, :own => 1})
end

if response2.status > 399
  $stderr.puts "Looks like something went wrong, got #{response.status} status from server"
  exit
end

document1 = Oga.parse_xml(response1.body)
document2 = Oga.parse_xml(response2.body)

collection1 = []
collection2 = []

# Collect both the name and original name in case a version is specified.

document1.xpath('items/item/name').each do |item|
  collection1 << item.text
end

document1.xpath('items/item/originalname').each do |item|
  collection1 << item.text
end

document2.xpath('items/item/name').each do |item|
  collection2 << item.text
end

document2.xpath('items/item/originalname').each do |item|
  collection2 << item.text
end

if opts['debug']
  ap collection1.map{ |e| CGI.unescape(e) }
  ap collection2.map{ |e| CGI.unescape(e) }
end

puts "The games that #{user1} and #{user2} have in common are:"
ap (collection1 & collection2).map{ |e| CGI.unescape(e) }.sort