Google+ to Twitter

gplus2twitter.rb

#!/usr/bin/env ruby

require 'open-uri'
require 'time'
require 'tmpdir'
require 'rubygems'
require 'oauth'
require 'json/pure'

user_id = '(Your Google+ user ID)'
api_key = '(Your Google API key)'

consumer_key = '(Your OAuth consumer key)'
consumer_secret = '(Your OAuth consumer secret)'
consumer = OAuth::Consumer.new( consumer_key, consumer_secret, :site => "http://twitter.com")
access_token = '(Your OAuth access token)'
access_token_secret = '(Your OAuth access token secret)'
token = OAuth::AccessToken.new( consumer, access_token, access_token_secret )

tmpfile = Dir.tmpdir+'/gplus2twitter'

obj = open( "https://www.googleapis.com/plus/v1/people/#{user_id}/activities/public?key=#{api_key}" ){|f| JSON.parse( f.read )} rescue nil
exit unless obj

if File.exist?( tmpfile ) then
    prev = open( tmpfile ){|f| Time.parse( f.read )}
else
    prev = Time.now - 600 # 10 minutes if first time
end

r = []
obj['items'].each do |item|
    title = item['title']
    url = item['url']
    date = Time.parse( item['published'] )
    if date > prev then
        r << ["#{title} #{url}", date]
    end
end
r.sort_by{|i| i.last}.each do |item, date|
    res = token.post( 'http://twitter.com/statuses/update.json', 'status' => item )
    break if res.code != '200'
    open( tmpfile, "w" ){|f| f.print date.to_s}
end
exit