input: 
  def generate_rest_api():
   """ Generate a basic REST API with authentication and endpoints using Flask.
   >>> app = generate_rest_api()
   >>> from werkzeug.security import safe_str_cmp
   >>> def authenticate(username, password):
   if username == 'user' and safe_str_cmp(password, 'pass'):
   return {'user': 'user'}
  
   >>> def identity(payload):
   return {'user': payload['identity']}
  
   >>> app.secret_key = 'super-secret-key'
   >>> from flask_jwt import JWT
   >>> jwt = JWT(app, authenticate, identity)
   >>> app.run(port=5000, debug=True)
   """
   from flask import Flask, request
   from flask_restful import Resource, Api
   from flask_jwt import JWT, jwt_required
  
   app = Flask(__name__)
   api = Api(app)
  
   items = []
  
   class Item(Resource):
   @jwt_required()
   def get(self, name):
   for item in items:
   if item['name'] == name:
   return item
   return {'item': None}, 404
  
   def post(self, name):
   new_item = {'name': name, 'price': 12.00}
   items.append(new_item)
   return new_item, 201
  
   class ItemList(Resource):
   def get(self):
   return {'items': items}
  
   api.add_resource(Item, '/item/<string:name>')
   api.add_resource(ItemList, '/items')
  
   return app
  
output:     
      def authenticate(username, password):
          if username == 'user' and safe_str_cmp(password, 'pass'):
              return {'user': 'user'}
  
      def identity(payload):
          return {'user': payload['identity']}
  
      app.secret_key = 'super-secret-key'
      jwt = JWT(app, authenticate, identity)
  