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classy_cas.rb
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classy_cas.rb
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require 'rubygems'
require "bundler/setup"
require 'sinatra'
require 'redis'
require 'haml'
require 'addressable/uri'
require 'nokogiri'
require 'lib/login_ticket'
require 'lib/proxy_ticket'
require 'lib/service_ticket'
require 'lib/ticket_granting_ticket'
require 'lib/user_store'
before do
@redis ||= Redis.new
end
get "/login" do
@service_url = Addressable::URI.parse(params[:service])
@renew = [true, "true", "1", 1].include?(params[:renew])
@gateway = [true, "true", "1", 1].include?(params[:gateway])
if @renew
@login_ticket = LoginTicket.create!(@redis)
haml :login
elsif @gateway
if @service_url
if sso_session
st = ServiceTicket.new(@service_url, sso_session.username)
redirect_url = @service_url.clone
redirect_url.query_values = @service_url.query_values.merge(:ticket => st.ticket)
redirect redirect_url.to_s, 303
else
redirect @service_url.to_s, 303
end
else
@login_ticket = LoginTicket.create!(@redis)
haml :login
end
else
if sso_session
if @service_url
st = ServiceTicket.new(@service_url, sso_session.username)
redirect_url = @service_url.clone
redirect_url.query_values = @service_url.query_values.merge(:ticket => st.ticket)
redirect redirect_url.to_s, 303
else
return haml :already_logged_in
end
else
@login_ticket = LoginTicket.create!(@redis)
haml :login
end
end
end
post "/login" do
username = params[:username]
password = params[:password]
service_url = params[:service]
warn = [true, "true", "1", 1].include? params[:warn]
# Spec is undefined about what to do without these params, so redirecting to credential requestor
redirect "/login", 303 unless username && password && login_ticket
if UserStore.authenticate(username, password)
if service_url && !warn
st = ServiceTicket.new(service_url, username)
st.save!(@redis)
redirect service_url + "?ticket=#{st.ticket}", 303
else
haml :logged_in
end
else
redirect "/login", 303
end
end
get %r{(proxy|service)Validate} do
service_url = params[:service]
ticket = params[:ticket]
# proxy_gateway = params[:pgtUrl]
# renew = params[:renew]
xml = if service_url && ticket
if service_ticket
if service_ticket.valid_for_service?(service_url)
render_validation_success service_ticket.username
else
render_validation_error(:invalid_service)
end
else
render_validation_error(:invalid_ticket)
end
else
render_validation_error(:invalid_request)
end
content_type :xml
xml
end
private
def sso_session
@sso_session ||= TicketGrantingTicket.validate!(request.cookies["tgt"], @redis)
end
def login_ticket
@login_ticket ||= LoginTicket.validate!(params[:lt], @redis)
end
def service_ticket
@service_ticket ||= ServiceTicket.find!(params[:ticket], @redis)
end
def render_validation_error(code)
xml = Nokogiri::XML::Builder.new do |xml|
xml.serviceResponse("xmlns:cas" => "http://www.yale.edu/tp/cas") {
xml['cas'].authenticationFailure(:code => code.to_s.upcase)
}
end
namespace_hack(xml)
end
def render_validation_success(username)
xml = Nokogiri::XML::Builder.new do |xml|
xml.serviceResponse("xmlns:cas" => "http://www.yale.edu/tp/cas") {
xml['cas'].authenticationSuccess {
xml['cas'].user username
}
}
end
namespace_hack(xml)
end
#Nokogiri will not allow a namespace to be used before
#It's declared, why this is I don't know.
def namespace_hack(xml)
result = xml.to_xml
result = result.gsub(/serviceResponse/, 'cas:serviceResponse')
result
end