application.rb

require "json"
require "date"
require "mongo"
require "bson"
require "sinatra"
require "sinatra/reloader" if development?
require "oauth2"
require "rest_client"



set :raise_errors, true
set :show_exceptions, false

#set mongo connection
mongoclient = Mongo::MongoClient.new
db = mongoclient.db( "social_nethub" )

oauth2 = OAuth2::Client.new(
  'BesuYeR65yfNWqPLwcyK',
  '138448238410115309201377100117',
  {
    :site => 'https://api.nethub.co',
    :token_url => '/oauth2/token/',
    :oauth_version => 2
  }
)


get '/' do
  redirect "http://nethub.co"
end

get '/:id' do
  token = oauth2.client_credentials.get_token({}, {"auth_scheme" => "request_body"})
  begin 
    response = token.get '/app/26d06213-04d6-4ab1-b9b6-e27bf8be738f/' + params[:id]
    data = response.parsed
    unless !data[ "data" ].empty?
      halt 404
    else
      client_id = data[ "data" ][ 0 ][ "client_id" ]
      redirect_uri = "http://localhost:3000/" + params[ :id ] + "/callback"
      redirect "https://www.facebook.com/dialog/oauth?client_id=" + client_id + "&redirect_uri=" + redirect_uri + "&scope=email,user_birthday,user_likes,user_location"
    end

  rescue Exception => e
    puts e
    halt 400
  end
 #raise "error!"
end


get "/:id/callback" do
  unless !params.has_key?( "error" )
    halt 401
  end

  token = oauth2.client_credentials.get_token({}, {"auth_scheme" => "request_body"})
  begin
    response = token.get '/app/26d06213-04d6-4ab1-b9b6-e27bf8be738f/' + params[:id]
    data = response.parsed
    unless !data[ "data" ].empty?
      halt 404
    end
    

    begin
      #set app data
      app_data = data[ "data" ][ 0 ]
      

      #Getting the FB token
      client_id = app_data[ "client_id" ]
      client_secret =  app_data[ "secret_id" ]
      redirect_uri = "http://localhost:3000/" + params[ :id ] + "/callback"
      code = params[ :code ]

      fb_response = RestClient.get "https://graph.facebook.com/oauth/access_token", :params => { :client_id => client_id, :redirect_uri => redirect_uri, :client_secret => client_secret, :code => code }
      fb_response =  CGI::parse( fb_response )
      
      fb_token = fb_response[ "access_token" ][0]
      fb_token_expires = fb_response[ "expires" ][0]
      #fb_token = 'CAAFLyNxrkcMBAM0dTfTD2TTiPT1XlJ7bXOZAbpNdZBNnVC96ymXZCfvqkfstjdXB496lhSUyfr89P7pNVe9PpMZCj82C1loDqhLDaJUZCoHj93MzFcIWd94xE4uV3mZBnnKzYFOqA89QXXZBYfZBGBQrQZACMD8JQsThpp49FHHK5faZC9HRxXPLkQAgxuZC5jlQMUZD'
      #fb_token_expires = '5176869'

      #get user information
      response = RestClient.get 'https://graph.facebook.com/me', :params => { :access_token => fb_token }, :content_type => :json, :accept => :json
      user_info = JSON.parse( response )
      
      # checking if the user exists in nethub
      response = token.get '/person/identifier/email/' + user_info[ "email" ]
      data = response.parsed
      unless !data[ "data" ].empty?

        #Create the user in nethub
        birthday = Date.strptime( user_info[ 'birthday' ], '%m/%d/%Y' )
        person = {
          :first_name => user_info[ "first_name" ],
          :last_name => user_info[ "last_name" ],
          :gender => user_info[ "gender" ],
          :birthday => birthday.strftime( '%m-%d-%Y' ),
          :identifiers => [{
            :email => user_info[ "email" ]
          }]
        }
        response = token.post '/person', { body: person.to_json }
        data = response.parsed
        unless data[ "success" ]
          halt 400
        end

        #create the user in social
        users = db.collection( "users" )
        user = users.find( :fid => user_info[ "id" ]).to_a
        unless !user.empty?
          users.insert( :nethub_id => data["id"], :fid => user_info[ "id" ], :token => fb_token, :expires => fb_token_expires , :read => false )
        end

      else
        #create the user in nethub if the user doesn't exits
        data = response.parsed
        users = db.collection( "users" )
        user = users.find( :nethub_id => data[ "data" ][0]["id"]).to_a
        unless !user.empty?
          users.insert( :nethub_id => data["data"][0]["id"], :fid => user_info[ "id" ], :token => fb_token, :expires => fb_token_expires , :read => false )
        end
       end      

      redirect [ app_data[ "domain" ], "/", app_data[ "callback" ] ].join 
    rescue Exception => e
      halt 500
    end

  rescue Exception => e
    #puts e
    halt 400

  end
end