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require 'rubygems'
require 'sinatra'
gem 'oauth2', '=0.4.1'
require 'oauth2'
require 'json'
require 'net/https'
# as found on https://foursquare.com/oauth/
CLIENT_ID = your_client_id
CLIENT_SECRET = your_client_secret
CALLBACK_PATH = '/auth/foursquare/callback'
def client
OAuth2::Client.new(CLIENT_ID, CLIENT_SECRET,
:site => 'http://foursquare.com/v2/',
:request_token_path => "/oauth2/request_token",
:access_token_path => "/oauth2/access_token",
:authorize_path => "/oauth2/authenticate?response_type=code",
:parse_json => true
)
end
get '/auth/foursquare/callback' do
# access_token = client.web_server.get_access_token(params[:code], :redirect_uri => redirect_uri)
# It would be better to use the line above but it returns a 301 error, so I use the hack below instead.
# start hack
uri = URI.parse("https://foursquare.com/oauth2/access_token?client_id=#{CLIENT_ID}&client_secret=#{CLIENT_SECRET}&grant_type=authorization_code&redirect_uri=#{redirect_uri}&code=" + params[:code])
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
request = Net::HTTP::Get.new(uri.request_uri)
response = JSON.parse(http.request(request).body)
access_token = OAuth2::AccessToken.new(client, response["access_token"])
# end hack
# some user data as an example
user = access_token.get('https://api.foursquare.com/v2/users/self')
user.inspect
end
def redirect_uri()
uri = URI.parse(request.url)
uri.path = CALLBACK_PATH
uri.query = nil
uri.to_s
end
get '/' do
redirect client.web_server.authorize_url(:redirect_uri => redirect_uri)
end