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zhdk-agw-auth-system.rb
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require 'active_support/all'
require 'cgi'
require 'jwt'
require 'optparse'
require 'ostruct'
require 'pathname'
require 'rest-client'
require 'sinatra/base'
require 'yaml'
require 'logger'
$logger = Logger.new(STDOUT)
$logger.level = Logger::DEBUG
$logger.formatter = proc do |severity, datetime, progname, msg|
"#{datetime.strftime('%Y-%m-%d %H:%M:%S')} - #{severity}: #{msg}\n\n"
end
# require 'pry'
# require 'rerun'
################################################################################
### options and config #########################################################
################################################################################
options = OpenStruct.new
# options.config_file = Pathname.new("dev/config.yml")
OptionParser.new do |opts|
opts.banner = "Usage: zhdk-agw-auth-system.rb [options]"
opts.on("-c", "--config-file [PATH]", String, "Configuration file") do |cf|
options.config_file = Pathname.new cf
end
end.parse!
$config = {
my_port: 3333
}.with_indifferent_access.deep_merge(
YAML.load_file(options.config_file).with_indifferent_access
).tap do |c|
c[:my_private_key] = OpenSSL::PKey.read(c[:my_private_key])
c[:my_public_key] = OpenSSL::PKey.read(c[:my_public_key])
c[:madek_public_key] = OpenSSL::PKey.read(c[:madek_public_key])
end
$logger.info($config)
################################################################################
### the web app ################################################################
################################################################################
class AuthenticatorApp < Sinatra::Base
set :environment, :development
get '/zhdk-agw/status' do
'OK'
end
### error handling and error messages ########################################
def expired_message sign_in_request_token
sign_in_request = JWT.decode sign_in_request_token,
$config[:madek_public_key], false, { algorithm: 'ES256' }
<<-HTML.strip_heredoc
<html>
<head></head>
<body>
<h1>Error: Token Expired </h1>
<p> Please <a href="#{sign_in_request[0]['server_base_url']}"> try again. </a></p>
</body>
</html>
HTML
end
def generic_error_message e
$logger.error "#{e} #{e.backtrace}"
<<-HTML.strip_heredoc
<html>
<head></head>
<body>
<h1> Unspecified Error in madek-AGW Authentication Service </h1>
<p> Please try again. </p>
<p> Contact your madek administrator if this problem occurs again. </p>
</body>
</html>
HTML
end
### sign-in ##################################################################
get '/zhdk-agw/sign-in' do
begin
sign_in_request_token = params[:token]
sign_in_request = JWT.decode sign_in_request_token,
$config[:madek_public_key], true, { algorithm: 'ES256' }
agw_username = sign_in_request.first["email-or-login"].presence
$logger.info({sign_in_request: sign_in_request})
token = JWT.encode({
sign_in_request_token: sign_in_request_token
# and more if we ever need it
}, $config[:my_private_key], 'ES256')
url = $config[:agw_base_url] + $config[:agw_app_id] \
+ (agw_username ? "&vusername=#{CGI::escape(agw_username)}" : "") \
+ '&url_postlogin=' \
+ CGI::escape("#{$config[:my_external_base_url]}/zhdk-agw/callback?" \
"token=#{token}" \
"&agw_session_id=%s")
redirect url
rescue JWT::ExpiredSignature => e
expired_message sign_in_request_token
rescue StandardError => e
generic_error_message e
end
end
### callback ##################################################################
get '/zhdk-agw/callback' do
begin
token_data = JWT.decode(params[:token],
$config[:my_public_key], true, { algorithm: 'ES256'}) \
.first.with_indifferent_access
sign_in_request_token = token_data[:sign_in_request_token]
sign_in_request = JWT.decode sign_in_request_token,
$config[:madek_public_key], true, { algorithm: 'ES256' }
sign_in_request = sign_in_request.first
$logger.debug sign_in_request: sign_in_request
agw_session_id = params[:agw_session_id]
url = $config[:agw_base_url] + $config[:agw_app_id] \
+ "/response" \
+ "&agw_sess_id=#{agw_session_id}" \
+ "&app_ident=#{$config[:agw_app_secret]}"
resp = RestClient.get(url)
$logger.debug({BODY: resp.body})
person = Hash.from_xml(resp.body).with_indifferent_access[:authresponse][:person]
$logger.debug({PERSON: person})
groups = person[:memberof][:group].map{|group|
$logger.debug({group: group}) && group
}.map{|g| g.gsub('zhdk/', '')
}.map{|g| {institutional_name: g}
}.each{|g| $logger.debug(g)}
groups << {id: 'efbfca9f-4191-5d27-8c94-618be5a125f5', type: 'AuthenticationGroup'}
token_payload = {
sign_in_request_token: sign_in_request_token,
'email-or-login': (person[:email].presence || person[:local_username].presence),
'account': {
'email': person[:email],
'first_name': person[:firstname],
'id': person[:id],
'last_name': person[:lastname],
'login': person[:local_username],
'groups': groups,},
success: true }
$logger.debug({TOKEN_PAYLOAD: token_payload})
token = JWT.encode(token_payload, $config[:my_private_key], 'ES256')
url = sign_in_request['sign-in-url'] + "?token=#{token}"
redirect url
rescue JWT::ExpiredSignature => e
expired_message sign_in_request_token
rescue StandardError => e
generic_error_message e
end
end
end
################################################################################
### start up ###################################################################
################################################################################
AuthenticatorApp.port = $config[:my_port]
AuthenticatorApp.run!