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server.rb
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server.rb
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require 'bundler/setup'
require 'json'
require 'jwt'
require 'net/http'
require 'rack/contrib'
require 'redis'
require 'sinatra'
require 'honeybadger'
if development?
# Load environment variables from .env and .env.local
require 'dotenv'
Dotenv.load '.env.local', '.env'
end
PLIRO_SITE_URL = URI(ENV.fetch('PLIRO_SITE_URL'))
PLIRO_ISSUER = ENV['PLIRO_ISSUER'] || ENV.fetch('PLIRO_SITE_URL')
PLIRO_SIGNING_KEY = OpenSSL::PKey.read(ENV.fetch('PLIRO_SIGNING_KEY'))
PLIRO_CLIENT_ID = ENV.fetch('PLIRO_CLIENT_ID')
PLIRO_CLIENT_SECRET = ENV.fetch('PLIRO_CLIENT_SECRET')
# Redis is used to store active Pliro session IDs:
$redis = Redis.new(url: ENV['REDIS_URL'], ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE })
# Sessions expire automatically after 7 days of inactivity:
SESSION_EXPIRATION_TIME = 7 * 24 * 60 * 60 # seconds
enable :sessions
set :session_secret, ENV.fetch('SESSION_SECRET')
set :sessions, expire_after: SESSION_EXPIRATION_TIME
# This block runs before each request to destroy expired sessions:
before do
break if session[:pliro_session_id].nil?
# If the key exists, GETEX will update exipration time and return its value.
# If the key doesn't exist (i.e. it has expired), GETEX just returns nil.
session.destroy if $redis.getex(session[:pliro_session_id], ex: SESSION_EXPIRATION_TIME).nil?
end
# This block runs before each request to trigger a silent login flow if the
# reauth param is set to true. This is used in continue URLs provided to the
# Pliro checkout flow to make sure customers are signed in after completing the
# checkout.
before do
if request.request_method == 'GET' && params[:reauth] == 'true'
uri = URI(request.fullpath)
query_params = parse_query(uri.query)
query_params.delete 'reauth'
uri.query = query_params.empty? ? nil : build_query(query_params)
request_authentication return_to: uri.to_s, prompt: 'none'
end
end
# Block search indexing
use Rack::ResponseHeaders do |headers|
headers['X-Robots-Tag'] = 'none'
end
# Article data is stored in a JSON file in the project root:
ARTICLES = JSON.parse(File.read(File.join(__dir__, 'articles.json')), object_class: OpenStruct)
# The home page:
get '/' do
@articles = ARTICLES
# This renders views/home.erb within views/layout.erb:
erb :home
end
# The article show page:
get '/articles/:slug' do
@article = ARTICLES.find { |article| article.slug == params[:slug] }
raise Sinatra::NotFound unless @article
# Refresh customer access info in case they have upgraded to premium after they last signed in:
if @article.premium && signed_in? && !premium_access?
response = Net::HTTP.get_response(
PLIRO_SITE_URL + '/oauth/userinfo',
'Authorization' => "Bearer #{session[:access_token]}",
)
if response.is_a?(Net::HTTPSuccess)
response_json = JSON.parse(response.body)
session[:name] = response_json['name'] || response_json['email']
session[:premium] = response_json['plan'] == 'premium'
elsif response.is_a?(Net::HTTPUnauthorized)
# If the customer's access token has expired, we trigger a silent login flow:
request_authentication return_to: request.fullpath, prompt: 'none'
end
end
@page_title = @article.headline
@meta_description = @article.meta_description
@og_image = url(@article.image)
# This renders views/article.erb within views/layout.erb:
erb :article
end
# Sign in endpoint:
get '/sign_in' do
request_authentication return_to: params[:return_to]
end
# OAuth callback endpoint:
get '/callback' do
# Avoid open redirect exploits:
return_to_url = if !params[:return_to].nil?
"#{request.scheme}://#{request.host_with_port}/#{params[:return_to].delete_prefix('/')}"
else
'/'
end
if params[:error] == 'login_required'
# The silent login flow failed and the user needs to sign in again.
session.destroy
redirect return_to_url
elsif params.key?(:error)
raise "OIDC error: error=#{params[:error].inspect} description=#{params[:error_description].inspect}"
end
if params[:state] != session[:state]
raise "CSRF error: state=#{params[:state].inspect} stored_state=#{session[:state].inspect}"
end
# Use the provided authorization code to request acess and ID tokens for the customer:
token_uri = PLIRO_SITE_URL + '/oauth/token'
token_request = Net::HTTP::Post.new(token_uri)
token_request.form_data = {
grant_type: 'authorization_code',
code: params[:code],
redirect_uri: build_redirect_uri(return_to: params[:return_to]),
}
token_request.basic_auth PLIRO_CLIENT_ID, PLIRO_CLIENT_SECRET
token_response = Net::HTTP.start(token_uri.hostname, token_uri.port, use_ssl: token_uri.scheme == 'https') do |http|
http.request token_request
end
response_json = JSON.parse(token_response.body)
id_token = response_json.fetch('id_token')
id_token_payload = decode_jwt(id_token).first
session.destroy
session[:access_token] = response_json.fetch('access_token')
session[:id_token] = id_token
session[:name] = id_token_payload['name'] || id_token_payload['email']
session[:pliro_session_id] = id_token_payload.fetch('sid')
session[:premium] = id_token_payload['plan'] == 'premium'
$redis.set session[:pliro_session_id], "", ex: SESSION_EXPIRATION_TIME
redirect return_to_url
end
# Sign out endpoint:
post '/sign_out' do
# Redirecting to this URL signs the customer out of Pliro too:
end_session_uri = PLIRO_SITE_URL + '/oauth/end_session'
end_session_uri.query = build_query(
client_id: PLIRO_CLIENT_ID,
id_token_hint: session[:id_token],
post_logout_redirect_uri: url('/'),
)
session.destroy
redirect end_session_uri
end
# OpenID Connect back-channel logout endpoint. If registered, Pliro makes a
# request to this endpoint when a customer signs out of Pliro:
post '/backchannel_logout' do
logout_token_payload, logout_token_header = decode_jwt(params[:logout_token])
if logout_token_payload['iss'] == PLIRO_ISSUER &&
logout_token_payload['aud'] == PLIRO_CLIENT_ID &&
logout_token_payload['iat'] <= Time.now.utc.to_i &&
logout_token_payload['iat'] >= Time.now.utc.to_i - 5 * 60 &&
!logout_token_payload['sub'].nil? &&
!logout_token_payload['sid'].nil? &&
logout_token_payload['events']&.key?('http://schemas.openid.net/event/backchannel-logout') &&
!logout_token_payload.key?('nonce') &&
logout_token_header['typ'] == 'logout+jwt'
$redis.del logout_token_payload['sid']
status 204
else
status 400
content_type :json
JSON.generate(error: 'invalid_request')
end
end
helpers do
def signed_in?
!session[:id_token].nil?
end
def customer_name
session[:name]
end
def premium_access?
!!session[:premium]
end
def simple_format(text)
text.split(/\n\n+/).map { |paragraph| "<p>#{paragraph}</p>" }.join("\n")
end
def request_authentication(return_to:, prompt: nil)
session[:state] = SecureRandom.hex
authorization_uri = PLIRO_SITE_URL + '/oauth/authorize'
authorization_uri.query = build_query({
client_id: PLIRO_CLIENT_ID,
response_type: 'code',
scope: 'openid email profile',
redirect_uri: build_redirect_uri(return_to:),
state: session[:state],
prompt:,
}.compact)
redirect authorization_uri
end
def build_redirect_uri(return_to:)
url '/callback' + (return_to.nil? ? '' : "?return_to=#{escape(return_to)}")
end
def build_continue_url
uri = URI(request.url)
query_params = parse_query(uri.query)
uri.query = build_query(query_params.merge(reauth: true))
uri.to_s
end
def decode_jwt(token)
JWT.decode(token, PLIRO_SIGNING_KEY, true, algorithm: 'ES256')
end
end