text: import os
  
  from flask import abort, Flask, redirect, render_template, request
  from flask.views import View
  from flask_wtf import FlaskForm
  from flask_wtf.csrf import CSRFProtect
  from wtforms import (
      BooleanField,
      HiddenField,
      PasswordField,
      SelectMultipleField,
      StringField,
      SubmitField,
  )
  from wtforms.validators import DataRequired
  
  import ory_hydra_client
  from ory_hydra_client.rest import ApiException
  
  
  configuration = ory_hydra_client.Configuration(host="http://localhost:4445")
  
  
  class DataRequiredIf(DataRequired):
      field_flags = ("optional",)
  
      def __init__(self, check_field, *args, **kwargs):
          self.check_field = check_field
          super().__init__(*args, **kwargs)
  
      def __call__(self, form, field):
          check_field = form._fields.get(self.check_field)
          if check_field is None:
              raise RuntimeError(f"No field called '{self.check_field}'")
          if check_field.data:
              super().__call__(form, field)
  
  
  class LoginForm(FlaskForm):
      login = SubmitField("login")
      abort = SubmitField("abort")
      user = StringField("user", validators=[DataRequiredIf("login")])
      password = PasswordField("password", validators=[DataRequiredIf("login")])
      remember = BooleanField("remember")
      challenge = HiddenField("challenge", validators=[DataRequired()])
  
  
  class ConsentForm(FlaskForm):
      accept = SubmitField("accept")
      decline = SubmitField("decline")
      challenge = HiddenField("challenge", validators=[DataRequired()])
      requested_scope = SelectMultipleField("requested scopes")
      remember = BooleanField("remember")
  
  
  class LoginView(View):
  
      methods = "GET", "POST"
  
      def render_form(self, form, **context):
          return render_template("login.html", form=form, **context)
  
      def dispatch_request(self):
          form = LoginForm()
  
          challenge = request.args.get("login_challenge") or form.challenge.data
          if not challenge:
              abort(400)
  
          with ory_hydra_client.ApiClient(configuration) as api_client:
              hydra = ory_hydra_client.AdminApi(api_client)
              login_request = hydra.get_login_request(challenge)
              if request.method == "GET":
                  return self.get(login_request, form, hydra)
              elif request.method == "POST":
                  return self.post(login_request, form, hydra)
          abort(405)
  
      def get(self, login_request, form, hydra):
          if login_request.skip:
              body = ory_hydra_client.AcceptLoginRequest(subject=login_request.subject)
              response = hydra.accept_login_request(login_request.challenge, body=body)
              return redirect(response.redirect_to)
          else:
              form.challenge.data = login_request.challenge
          return self.render_form(form)
  
      def post(self, login_request, form, hydra):
          if form.validate():
              if form.login.data:
                  if form.user.data == "foo@bar.com" and form.password.data == "password":
                      subject = form.user.data
                      remember = form.remember.data
                      body = ory_hydra_client.AcceptLoginRequest(
                          subject=subject, remember=remember
                      )
                      response = hydra.accept_login_request(
                          login_request.challenge, body=body
                      )
                  else:
                      # TODO: show error message
                      return self.render_form(form)
              else:
                  body = ory_hydra_client.RejectRequest(error="user_decline")
                  response = hydra.reject_login_request(
                      login_request.challenge, body=body
                  )
              return redirect(response.redirect_to)
          return self.render_form(form)
  
  
  class ConsentView(View):
  
      methods = "GET", "POST"
  
      def render_form(self, form, **context):
          return render_template("consent.html", form=form, **context)
  
      def dispatch_request(self):
          form = ConsentForm()
  
          challenge = request.args.get("consent_challenge") or form.challenge.data
          if not challenge:
              abort(400)
  
          with ory_hydra_client.ApiClient(configuration) as api_client:
              hydra = ory_hydra_client.AdminApi(api_client)
              consent_request = hydra.get_consent_request(challenge)
              form.requested_scope.choices = [
                  (s, s) for s in consent_request.requested_scope
              ]
  
              session = {
                  "access_token": {},
                  "id_token": {
                      "sub": "248289761001",
                      "name": "Jane Doe",
                      "given_name": "Jane",
                      "family_name": "Doe",
                      "preferred_username": "j.doe",
                      "email": "janedoe@example.com",
                      "picture": "",
                  },
              }
  
              if request.method == "GET":
                  return self.get(form, consent_request, session, hydra)
              elif request.method == "POST":
                  return self.post(form, consent_request, session, hydra)
              abort(405)
  
      def get(self, form, consent_request, session, hydra):
          if consent_request.skip:
              body = ory_hydra_client.AcceptConsentRequest(
                  grant_scope=consent_request.requested_scope,
                  grant_access_token_audience=consent_request.requested_access_token_audience,
                  session=session,
              )
              response = hydra.accept_consent_request(
                  consent_request.challenge, body=body
              )
              return redirect(response.redirect_to)
          else:
              form.challenge.data = consent_request.challenge
  
          return self.render_form(
              form, user=consent_request.subject, client=consent_request.client
          )
  
      def post(self, form, consent_request, session, hydra):
          if form.validate():
              if form.accept.data:
                  body = ory_hydra_client.AcceptConsentRequest(
                      grant_scope=form.requested_scope.data,
                      grant_access_token_audience=consent_request.requested_access_token_audience,
                      session=session,
                      remember=form.remember.data,
                  )
                  response = hydra.accept_consent_request(
                      consent_request.challenge, body=body
                  )
              else:
                  body = ory_hydra_client.RejectRequest(error="user_decline")
                  response = hydra.reject_consent_request(
                      consent_request.challenge, body=body
                  )
              return redirect(response.redirect_to)
          else:
              # TODO: show error message
              pass
          return self.render_form(form)
  
  
  app = Flask(__name__)
  app.secret_key = os.urandom(16)
  csrf = CSRFProtect(app)
  
  app.add_url_rule("/login", view_func=LoginView.as_view("login"))
  app.add_url_rule("/consent", view_func=ConsentView.as_view("consent"))
  