refactor: remove anything unrelated to the authz daemon

1 files changed, 0 insertions, 895 deletions

diff --git a/bin/idp b/bin/idp
deleted file mode 100755
index 62462deb..00000000
--- a/bin/idp
+++ /dev/null
@@ -1,895 +0,0 @@
-#!/usr/bin/env ruby
-
-require "bundler/inline"
-
-gemfile do
-  source "https://rubygems.org"
-
-  gem "base64", "~> 0.1"
-  gem "bcrypt", "~> 3.0"
-  gem "csv", "~> 3.0"
-  gem "declarative_policy", "~> 1.0"
-  gem "erb", "~> 4.0"
-  gem "globalid", "~> 1.0"
-  gem "google-protobuf", "~> 3.0"
-  gem "rack", "~> 3.0"
-  gem "rack-session", "~> 2.0"
-  gem "rackup", "~> 2.0"
-  gem "saml-kit", "1.4.0"
-  gem "twirp", "~> 1.0"
-  gem "warden", "~> 1.0"
-  gem "webrick", "~> 1.0"
-end
-
-lib_path = Pathname.new(__FILE__).parent.parent.join('lib').realpath.to_s
-$LOAD_PATH.unshift(lib_path) unless $LOAD_PATH.include?(lib_path)
-
-require 'authx/rpc'
-
-$scheme = ENV.fetch("SCHEME", "http")
-$port = ENV.fetch("PORT", 8282).to_i
-$host = ENV.fetch("HOST", "localhost:#{$port}")
-
-DeclarativePolicy.configure do
-  name_transformation do |name|
-    "::Authz::#{name}Policy"
-  end
-end
-
-Warden::Manager.serialize_into_session do |user|
-  user.id
-end
-
-Warden::Manager.serialize_from_session do |id|
-  ::Authn::User.find(id)
-end
-
-Warden::Strategies.add(:password) do
-  def valid?
-    params['username'] && params['password']
-  end
-
-  def authenticate!
-    user = ::Authn::User.login(params.transform_keys(&:to_sym))
-    user.nil? ? fail!("Could not log in") : success!(user)
-  end
-end
-
-module HTTPHelpers
-  def current_user?(request)
-    request.env['warden'].authenticated?
-  end
-
-  def current_user(request)
-    request.env['warden'].user
-  end
-
-  def default_headers
-    {
-      'X-Powered-By' => 'IdP'
-    }
-  end
-
-  def http_not_found
-    [404, default_headers, []]
-  end
-
-  def http_ok(headers = {}, body = nil)
-    [200, default_headers.merge(headers), [body]]
-  end
-
-  def http_redirect_to(location)
-    [302, { 'Location' => "#{$scheme}://#{$host}#{location}" }, []]
-  end
-end
-
-module Authn
-  class User
-    include ::BCrypt
-
-    class << self
-      def all
-        @all ||= ::CSV.read(File.join(__dir__, "../db/idp/users.csv"), headers: true).map do |row|
-          new(row.to_h.transform_keys(&:to_sym))
-        end
-      end
-
-      def find(id)
-        all.find do |user|
-          user[:id] == id
-        end
-      end
-
-      def find_by
-        all.find do |user|
-          yield user
-        end
-      end
-
-      def find_by_email(email)
-        find_by do |user|
-          user[:email] == email
-        end
-      end
-
-      def find_by_username(username)
-        find_by do |user|
-          user[:username] == username
-        end
-      end
-
-      def login(params = {})
-        user = find_by_username(params[:username])
-        user&.valid_password?(params[:password]) ? user : nil
-      end
-    end
-
-    attr_reader :id
-
-    def initialize(attributes)
-      @attributes = attributes
-      @id = self[:id]
-    end
-
-    def [](attribute)
-      @attributes.fetch(attribute.to_sym)
-    end
-
-    def name_id_for(name_id_format)
-      if name_id_format == Saml::Kit::Namespaces::EMAIL_ADDRESS
-        self[:email]
-      else
-        self[:id]
-      end
-    end
-
-    def create_access_token
-      ::Authz::JWT.new(
-        sub: to_global_id.to_s,
-        auth_time: Time.now.to_i,
-        email: self[:email],
-        username: self[:username],
-      )
-    end
-
-    def create_id_token
-      ::Authz::JWT.new(sub: to_global_id.to_s)
-    end
-
-    def assertion_attributes_for(request)
-      {
-        email: self[:email],
-      }
-    end
-
-    def valid_password?(entered_password)
-      ::BCrypt::Password.new(self[:password_digest]) == entered_password
-    end
-
-    def to_global_id
-      ::GlobalID.new(
-        ::URI::GID.build(
-          app: "example",
-          model_name: "User",
-          model_id: id,
-          params: {}
-        )
-      ).to_s
-    end
-  end
-
-  class OnDemandRegistry < Saml::Kit::DefaultRegistry
-    def metadata_for(entity_id)
-      found = super(entity_id)
-      return found if found
-
-      register_url(entity_id, verify_ssl: false)
-      super(entity_id)
-    end
-  end
-
-  class SessionsController
-    include ::HTTPHelpers
-
-    def call(env)
-      request = Rack::Request.new(env)
-      case request.request_method
-      when Rack::GET
-        case request.path
-        when '/sessions/new'
-          return get_login(request)
-        end
-      when Rack::POST
-        case request.path
-        when '/sessions'
-          if (user = env['warden'].authenticate(:password))
-            path = request.params["redirect_back"] ? request.params["redirect_back"] : "/"
-            return http_redirect_to(path)
-          else
-            return http_redirect_to("/sessions/new")
-          end
-        when '/sessions/delete'
-          request.env['warden'].logout
-          return http_redirect_to('/')
-        end
-      end
-
-      http_not_found
-    end
-
-    private
-
-    def get_login(request)
-      template = <<~ERB
-      <!doctype html>
-      <html lang="en" data-theme="light">
-        <head>
-          <title>IdP</title>
-          <meta charset="utf-8">
-          <meta name="viewport" content="width=device-width, initial-scale=1">
-          <meta name="color-scheme" content="light dark">
-          <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
-        </head>
-        <body>
-          <main class="container">
-            <nav>
-              <ul>
-                <li><strong>IdP</strong></li>
-                <li><a href="http://ui.example.com:8080/">UI</a></li>
-              </ul>
-            </nav>
-
-            <form id="login-form" action="/sessions" method="post">
-              <fieldset>
-                <label>
-                  Username
-                  <input type="input" placeholder="Username" id="username" name="username" value="" />
-                </label>
-                <label>
-                  Password
-                  <input type="password" placeholder="Password" id="password" name="password" value="" />
-                </label>
-              </fieldset>
-
-              <input type="hidden" name="redirect_back" value="<%= request.params["redirect_back"] %>" />
-              <input type="submit" id="login-button" value="Login" />
-            </form>
-          </main>
-        </body>
-      </html>
-      ERB
-      html = ERB.new(template, trim_mode: '-').result(binding)
-      [200, { 'Content-Type' => "text/html" }, [html]]
-    end
-  end
-
-  class SAMLController
-    include ::HTTPHelpers
-
-    def initialize(scheme, host)
-      Saml::Kit.configure do |x|
-        x.entity_id = "#{$scheme}://#{$host}/saml/metadata.xml"
-        x.registry = OnDemandRegistry.new
-        x.logger = Logger.new("/dev/stderr")
-      end
-
-      @saml_metadata = Saml::Kit::Metadata.build do |builder|
-        builder.contact_email = 'hi@example.com'
-        builder.organization_name = "Acme, Inc"
-        builder.organization_url = "#{scheme}://#{host}"
-        builder.build_identity_provider do |x|
-          x.add_single_sign_on_service("#{scheme}://#{host}/saml/new", binding: :http_post)
-          x.name_id_formats = [Saml::Kit::Namespaces::PERSISTENT, Saml::Kit::Namespaces::EMAIL_ADDRESS]
-          x.attributes << :email
-        end
-      end
-    end
-
-    def call(env)
-      request = Rack::Request.new(env)
-      case request.request_method
-      when Rack::GET
-        case request.path
-        when "/saml/continue"
-          if current_user?(request)
-            saml_params = request.session[:saml_params]
-            return saml_post_back(request, current_user(request), saml_params)
-          else
-            return http_redirect_to("/sessions/new?redirect_back=/saml/continue")
-          end
-        when "/saml/metadata.xml"
-          return http_ok(
-            { 'Content-Type' => "application/samlmetadata+xml" },
-            saml_metadata.to_xml(pretty: true)
-          )
-        end
-      when Rack::POST
-        case request.path
-        when "/saml/new"
-          saml_params = saml_params_from(request)
-
-          if current_user?(request)
-            return saml_post_back(request, current_user(request), saml_params)
-          else
-            request.session[:saml_params] = saml_params
-            return http_redirect_to("/sessions/new?redirect_back=/saml/continue")
-          end
-        end
-      end
-
-      http_not_found
-    end
-
-    private
-
-    attr_reader :saml_metadata
-
-    def saml_post_back(request, user, saml_params)
-      saml_request = binding_for(request).deserialize(saml_params)
-
-      @builder = nil
-      url, saml_params = saml_request.response_for(
-        user,
-        binding: :http_post,
-        relay_state: saml_params[:RelayState]
-      ) { |builder| @builder = builder }
-      template = <<~ERB
-      <!doctype html>
-      <html lang="en" data-theme="light">
-        <head>
-          <title>IdP</title>
-          <meta charset="utf-8">
-          <meta name="viewport" content="width=device-width, initial-scale=1">
-          <meta name="color-scheme" content="light dark">
-          <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
-        </head>
-        <body>
-          <main class="container">
-            <nav>
-              <ul>
-                <li><strong>IdP</strong></li>
-                <li><a href="http://ui.example.com:8080/">UI</a></li>
-              </ul>
-            </nav>
-
-            <h2>Recieved SAML Request</h2>
-            <textarea readonly="readonly" disabled="disabled" cols=225 rows=8><%=- saml_request.to_xml(pretty: true) -%></textarea>
-
-            <h2>Sending SAML Response (IdP -> SP)</h2>
-            <textarea readonly="readonly" disabled="disabled" cols=225 rows=32><%=- @builder.build.to_xml(pretty: true) -%></textarea>
-            <form id="postback-form" action="<%= url %>" method="post">
-              <%- saml_params.each do |(key, value)| -%>
-                <input type="hidden" name="<%= key %>" value="<%= value %>" />
-              <%- end -%>
-              <input id="submit-button" type="submit" value="Continue" />
-            </form>
-          </main>
-        </body>
-      </html>
-      ERB
-      erb = ERB.new(template, trim_mode: '-')
-      html = erb.result(binding)
-      [200, { 'Content-Type' => "text/html" }, [html]]
-    end
-
-    def saml_params_from(request)
-      if request.post?
-        {
-          "SAMLRequest" => request.params["SAMLRequest"],
-          "RelayState" => request.params["RelayState"],
-        }
-      else
-        query_string = request.query_string
-        on = query_string.include?("&amp;") ? "&amp;" : "&"
-        Hash[query_string.split(on).map { |x| x.split("=", 2) }].symbolize_keys
-      end
-    end
-
-    def binding_for(request)
-      Saml::Kit::Bindings::HttpPost.new(location: "#{$scheme}://#{$host}/saml/new")
-    end
-  end
-end
-
-class Organization
-  class << self
-    def find(id)
-      new
-    end
-  end
-end
-
-module Authz
-  class OrganizationPolicy < DeclarativePolicy::Base
-    condition(:owner) { true }
-
-    rule { owner }.enable :read_project
-    rule { owner }.enable :read_group
-    rule { owner }.enable :create_project
-  end
-
-  class JWT
-    class << self
-      # TODO:: validate signature
-      def decode(encoded)
-        _header, body, _signature = encoded
-          .split('.', 3)
-          .map { |x| JSON.parse(Base64.strict_decode64(x), symbolize_names: true) rescue {} }
-        new(body)
-      end
-    end
-
-    attr_reader :claims
-
-    def initialize(claims)
-      now = Time.now.to_i
-      @claims = {
-        iss: "#{$scheme}://#{$host}",
-        iat: now,
-        aud: "",
-        nbf: now,
-        jti: SecureRandom.uuid,
-        exp: now + 3600,
-      }.merge(claims)
-    end
-
-    def [](claim)
-      claims.fetch(claim)
-    end
-
-    def active?
-      now = Time.now.to_i
-      self[:nbf] <= now && now < self[:exp]
-    end
-
-    def to_jwt
-      [
-        Base64.strict_encode64(JSON.generate(alg: "none")),
-        Base64.strict_encode64(JSON.generate(claims)),
-        ""
-      ].join(".")
-    end
-  end
-
-  module Rpc
-    class Ability
-      def allowed(request, env)
-        {
-          result: can?(request)
-        }
-      end
-
-      private
-
-      def can?(request)
-        subject = subject_of(request.subject)
-        resource = resource_from(request.resource)
-        permission = request.permission.to_sym
-
-        policy = DeclarativePolicy.policy_for(subject, resource)
-        policy.can?(permission)
-      rescue StandardError => error
-        puts error.inspect
-        false
-      end
-
-      def subject_of(encoded_token)
-        token = ::Authz::JWT.decode(encoded_token)
-        token&.claims[:sub]
-      end
-
-      def resource_from(global_id)
-        GlobalID::Locator.locate(global_id)
-      end
-    end
-  end
-
-  class AuthorizationGrant
-    class << self
-      def all
-        @all ||= []
-      end
-
-      def find_by(params)
-        case params[:grant_type]
-        when 'authorization_code'
-          authorization_code_grant(params[:code], params[:code_verifier])
-        when 'refresh_token'
-          refresh_grant(params[:refresh_token])
-        when 'client_credentials'
-          client_credentials_grant(params)
-        when 'password'
-          password_grant(params[:username], params[:password])
-        when "urn:ietf:params:oauth:grant-type:saml2-bearer" # RFC-7522
-          saml_assertion_grant(params[:assertion])
-        when 'urn:ietf:params:oauth:grant-type:jwt-bearer' # RFC7523
-          jwt_bearer_grant(params)
-        end
-      end
-
-      # TODO:: implement `code_verifier` param
-      def authorization_code_grant(code, code_verifier)
-        all.find do |grant|
-          grant.active? && grant.code == code
-        end
-      end
-
-      def refresh_grant(refresh_token)
-        raise NotImplementedError
-      end
-
-      def client_credential_grant(params)
-        raise NotImplementedError
-      end
-
-      def password_grant(username, password)
-        raise NotImplementedError
-      end
-
-      def saml_assertion_grant(encoded_saml_assertion)
-        xml = Base64.decode64(encoded_saml_assertion)
-        # TODO:: Validate signature and prevent assertion reuse
-        saml_assertion = Saml::Kit::Document.to_saml_document(xml)
-
-        user = ::Authn::User.find_by_email(saml_assertion.name_id) ||
-          ::Authn::User.find(saml_assertion.name_id)
-        new(user, saml_assertion: saml_assertion)
-      end
-
-      def jwt_bearer_grant(params)
-        raise NotImplementedError
-      end
-
-      def create!(user, params = {})
-        new(user, params).tap do |grant|
-          all << grant
-        end
-      end
-    end
-
-    attr_reader :code, :user, :params
-
-    def initialize(user, params = {})
-      @user = user
-      @params = params
-      @code = SecureRandom.uuid
-      @exchanged_at = nil
-    end
-
-    def active?
-      @exchanged_at.nil?
-    end
-
-    def inactive?
-      !active?
-    end
-
-    def create_access_token
-      raise "Invalid code" unless active?
-
-      user.create_access_token.tap do
-        @exchanged_at = Time.now
-      end
-    end
-
-    def exchange
-      {
-        access_token: create_access_token.to_jwt,
-        token_type: "Bearer",
-        issued_token_type: "urn:ietf:params:oauth:token-type:access_token",
-        expires_in: 3600,
-        refresh_token: SecureRandom.hex(32)
-      }.tap do |body|
-        if params["scope"]&.include?("openid")
-          body[:id_token] = user.create_id_token.to_jwt
-        end
-      end
-    rescue StandardError => error
-      {
-        error: error.message,
-        error_description: error.backtrace,
-      }
-    end
-  end
-
-  class OAuthController
-    include ::HTTPHelpers
-
-    def call(env)
-      request = Rack::Request.new(env)
-
-      case request.request_method
-      when Rack::GET
-        case request.path
-        when "/oauth/authorize/continue"
-          if current_user?(request)
-            return get_authorize(request.session[:oauth_params])
-          end
-        when "/oauth/authorize" # RFC-6749
-          oauth_params = request.params.slice('client_id', 'scope', 'redirect_uri', 'response_mode', 'response_type', 'state', 'code_challenge_method', 'code_challenge')
-          if current_user?(request)
-            return get_authorize(oauth_params)
-          else
-            request.session[:oauth_params] = oauth_params
-            return http_redirect_to("/sessions/new?redirect_back=/oauth/authorize/continue")
-          end
-        else
-          return http_not_found
-        end
-      when Rack::POST
-        case request.path
-        when "/oauth/authorize" # RFC-6749
-          return post_authorize(request)
-        when "/oauth/introspect" # RFC-7662
-          params = request.content_type == "application/json" ? JSON.parse(request.body.read, symbolize_names: true) : Hash[URI.decode_www_form(request.body.read)].transform_keys(&:to_sym)
-          return post_introspect(params.slice(:token, :token_type_hint))
-        when "/oauth/token" # RFC-6749
-          params = request.content_type == "application/json" ? JSON.parse(request.body.read, symbolize_names: true) : Hash[URI.decode_www_form(request.body.read)].transform_keys(&:to_sym)
-          grant = AuthorizationGrant.find_by(params)
-
-          return [404, { "Content-Type" => "application/json" }, [JSON.pretty_generate(error: 404, error_description: "Not Found")]] if grant.nil? || grant.inactive?
-          return [200, { "Content-Type" => "application/json" }, [JSON.pretty_generate(grant.exchange)]]
-        when "/oauth/revoke" # RFC-7009
-          # TODO:: Revoke the JWT token and make it ineligible for usage
-          return http_not_found
-        else
-          return http_not_found
-        end
-      end
-      http_not_found
-    end
-
-    private
-
-    def post_introspect(params)
-      token = ::Authz::JWT.decode(params[:token])
-      return [200, { "Content-Type" => "application/json" }, [JSON.pretty_generate(token.claims.merge(active: token.active?))]]
-    end
-
-    def get_authorize(oauth_params)
-      template = <<~ERB
-      <!doctype html>
-      <html lang="en" data-theme="light">
-        <head>
-          <title>IdP</title>
-          <meta charset="utf-8">
-          <meta name="viewport" content="width=device-width, initial-scale=1">
-          <meta name="color-scheme" content="light dark">
-          <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
-        </head>
-        <body>
-          <main class="container">
-            <nav>
-              <ul>
-                <li><strong>IdP</strong></li>
-                <li><a href="http://ui.example.com:8080/">UI</a></li>
-              </ul>
-            </nav>
-
-            <h1>Authorize?</h1>
-            <p>Client ID: <%= oauth_params['client_id'] %></p>
-            <form id="authorize-form" action="/oauth/authorize" method="post">
-              <input type="hidden" name="client_id" value="<%= oauth_params['client_id'] %>" />
-              <input type="hidden" name="scope" value="<%= oauth_params['scope'] %>" />
-              <input type="hidden" name="redirect_uri" value="<%= oauth_params['redirect_uri'] %>" />
-              <input type="hidden" name="response_mode" value="<%= oauth_params['response_mode'] %>" />
-              <input type="hidden" name="response_type" value="<%= oauth_params['response_type'] %>" />
-              <input type="hidden" name="state" value="<%= oauth_params['state'] %>" />
-              <input type="hidden" name="code_challenge_method" value="<%= oauth_params['code_challenge_method'] %>" />
-              <input type="hidden" name="code_challenge" value="<%= oauth_params['code_challenge'] %>" />
-              <input id="submit-button" type="submit" value="Authorize" />
-            </form>
-          </main>
-        </body>
-      </html>
-      ERB
-      html = ERB.new(template, trim_mode: '-').result(binding)
-      [200, { 'Content-Type' => "text/html" }, [html]]
-    end
-
-    def post_authorize(request)
-      params = request.params.slice('client_id', 'redirect_uri', 'response_type', 'response_mode', 'state', 'code_challenge_method', 'code_challenge', 'scope')
-      grant = AuthorizationGrant.create!(current_user(request), params)
-      case params['response_type']
-      when 'code'
-        case params['response_mode']
-        when 'fragment'
-          return [302, { 'Location' => "#{params['redirect_uri']}#code=#{grant.code}&state=#{params['state']}" }, []]
-        when 'query'
-          return [302, { 'Location' => "#{params['redirect_uri']}?code=#{grant.code}&state=#{params['state']}" }, []]
-        else
-          # TODO:: form post
-        end
-      when 'token'
-        return http_not_found
-      else
-        return http_not_found
-      end
-    end
-  end
-end
-
-class IdentityProvider
-  include ::HTTPHelpers
-
-  def call(env)
-    request = Rack::Request.new(env)
-
-    case request.request_method
-    when Rack::GET
-      case request.path
-      when '/'
-        if current_user?(request)
-          return get_dashboard(request)
-        else
-          return http_redirect_to("/sessions/new")
-        end
-      when '/.well-known/openid-configuration'
-        return openid_metadata
-      when '/.well-known/oauth-authorization-server'
-        return oauth_metadata
-      when '/.well-known/webfinger' # RFC-7033
-        return http_not_found
-      else
-        return http_not_found
-      end
-    end
-    http_not_found
-  end
-
-  private
-
-  def get_dashboard(request)
-    template = <<~ERB
-      <!doctype html>
-      <html lang="en" data-theme="light">
-        <head>
-          <title>IdP</title>
-          <meta charset="utf-8">
-          <meta name="viewport" content="width=device-width, initial-scale=1">
-          <meta name="color-scheme" content="light dark">
-          <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
-        </head>
-        <body>
-          <main class="container">
-            <nav>
-              <ul>
-                <li><strong>IdP</strong></li>
-                <li><a href="http://ui.example.com:8080/">UI</a></li>
-              </ul>
-              <ul>
-                <li><a href="/">Home</a></li>
-                <li><a href="http://ui.example.com:8080/groups.html">Groups</a></li>
-                <li>
-                  <form action="/sessions/delete" method="post">
-                    <input type="submit" value="logout" />
-                  </form>
-                </li>
-              </ul>
-            </nav>
-
-            <h1> Hello, <%= current_user(request)[:username] %></h1>
-          </main>
-        </body>
-      </html>
-    ERB
-    erb = ERB.new(template, trim_mode: '-')
-    html = erb.result(binding)
-    [200, { 'Content-Type' => "text/html" }, [html]]
-  end
-
-  # GET /.well-known/oauth-authorization-server
-  def oauth_metadata
-    [200, { 'Content-Type' => "application/json" }, [JSON.pretty_generate({
-      issuer: "#{$scheme}://#{$host}/.well-known/oauth-authorization-server",
-      authorization_endpoint: "#{$scheme}://#{$host}/oauth/authorize",
-      token_endpoint: "#{$scheme}://#{$host}/oauth/token",
-      jwks_uri: "", # RFC-7517
-      registration_endpoint: "", # RFC-7591
-      scopes_supported: ["openid", "profile", "email"],
-      response_types_supported: ["code", "code id_token", "id_token", "token id_token"],
-      response_modes_supported: ["query", "fragment", "form_post"],
-      grant_types_supported: ["authorization_code", "implicit"], # RFC-7591
-      token_endpoint_auth_methods_supported: ["client_secret_basic"], # RFC-7591
-      token_endpoint_auth_signing_alg_values_supported: ["RS256"],
-      service_documentation: "",
-      ui_locales_supported: ["en-US"],
-      op_policy_uri: "",
-      op_tos_uri: "",
-      revocation_endpoint: "#{$scheme}://#{$host}/oauth/revoke", # RFC-7009
-      revocation_endpoint_auth_methods_supported: ["client_secret_basic"],
-      revocation_endpoint_auth_signing_alg_values_supported: ["RS256"],
-      introspection_endpoint: "#{$scheme}://#{$host}/oauth/introspect", # RFC-7662
-      introspection_endpoint_auth_methods_supported: ["client_secret_basic"],
-      introspection_endpoint_auth_signing_alg_values_supported: ["RS256"],
-      code_challenge_methods_supported: [], # RFC-7636
-    })]]
-  end
-
-  # GET /.well-known/openid-configuration
-  def openid_metadata
-    [200, { 'Content-Type' => "application/json" }, [JSON.pretty_generate({
-      issuer: "#{$scheme}://#{$host}/.well-known/oauth-authorization-server",
-      authorization_endpoint: "#{$scheme}://#{$host}/oauth/authorize",
-      token_endpoint: "#{$scheme}://#{$host}/oauth/token",
-      userinfo_endpoint: "#{$scheme}://#{$host}/oidc/user/",
-      jwks_uri: "", # RFC-7517
-      registration_endpoint: nil,
-      scopes_supported: ["openid", "profile", "email"],
-      response_types_supported: ["code", "code id_token", "id_token", "token id_token"],
-      response_modes_supported: ["query", "fragment", "form_post"],
-      grant_types_supported: ["authorization_code", "implicit"], # RFC-7591
-      acr_values_supported: [],
-      subject_types_supported: ["pairwise", "public"],
-      id_token_signing_alg_values_supported: ["RS256"],
-      id_token_encryption_alg_values_supported: [],
-      id_token_encryption_enc_values_supported: [],
-      userinfo_signing_alg_values_supported: ["RS256"],
-      userinfo_encryption_alg_values_supported: [],
-      userinfo_encryption_enc_values_supported: [],
-      request_object_signing_alg_values_supported: ["none", "RS256"],
-      request_object_encryption_alg_values_supported: [],
-      request_object_encryption_enc_values_supported: [],
-      token_endpoint_auth_methods_supported: ["client_secret_post", "client_secret_basic", "client_secret_jwt", "private_key_jwt"],
-      token_endpoint_auth_signing_alg_values_supported: [],
-      display_values_supported: [],
-      claim_types_supported: ["normal", "aggregated", "distributed"],
-      claims_supported: [
-        "acr",
-        "auth_time",
-        "email",
-        "email_verified",
-        "family_name",
-        "given_name",
-        "iss",
-        "locale",
-        "name",
-        "nickname",
-        "picture",
-        "profile",
-        "sub",
-        "website"
-      ],
-      service_documentation: nil,
-      claims_locales_supported: [],
-      ui_locales_supported: ["en-US"],
-      claims_parameter_supported: false,
-      request_parameter_supported: false,
-      request_uri_paramater_supported: false,
-      require_request_uri_registration: false,
-      op_policy_uri: "",
-      op_tos_uri: "",
-    })]]
-  end
-end
-
-if __FILE__ == $0
-  app = Rack::Builder.new do
-    use Rack::CommonLogger
-    use Rack::Reloader
-    use Rack::Session::Cookie, { domain: $host.split(":", 2)[0], path: "/", secret: SecureRandom.hex(64) }
-    use ::Warden::Manager do |config|
-      config.default_scope = :user
-      config.default_strategies :password
-    end
-
-    map "/twirp" do
-      # https://github.com/arthurnn/twirp-ruby/wiki/Service-Handlers
-      run ::Authx::Rpc::AbilityService.new(::Authz::Rpc::Ability.new)
-    end
-    map "/oauth" do
-      run ::Authz::OAuthController.new
-    end
-
-    map "/saml" do
-      run Authn::SAMLController.new($scheme, $host)
-    end
-
-    map "/sessions" do
-      run Authn::SessionsController.new
-    end
-    run IdentityProvider.new
-  end.to_app
-
-  Rackup::Server.start(app: app, Port: $port)
-end