text: from hashlib import sha256
  import os
  
  from authentication import AuthenticationService
  from models import Product, User
  
  from definition import app, engine
  
  app.define(models=[User, Product], engine=engine)
  
  
  @app.route(methods=['GET'], path='/')
  def home(request, *args, **kwargs):
      return {
          'status': 200,
          'message': 'Basic CRUD example'
      }
  
  
  @app.route(methods=['POST'], path='/signup/$')
  def signup(request, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": ""
      }
  
      try:
          body = request.get_post_body()
          if 'email' not in body or 'password' not in body:
              raise Exception('Request should include email and password')
  
          if User.get(where={'email': body.get('email')}):
              raise Exception('User with this email already exists')
  
          User.insert(
              email=body.get('email'),
              password=sha256(body.get('password').encode('utf-8')).hexdigest(),
              maintainer=body.get('maintainer') or False,
          )
  
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['POST'], path='/login/$')
  def login(request, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
          "user": {}
      }
  
      try:
          body = request.get_post_body()
          if 'email' not in body or 'password' not in body:
              raise Exception('Request should include email and password')
  
          user = User.get(where={'email': body.get('email')})
  
          if not user:
              raise Exception('No user with this email exists')
  
          if user.get('password') == sha256(body.get('password').encode('utf-8')).hexdigest():
              resp["user"] = {
                  "id": user.get('id', ''),
                  "email": user.get('email', ''),
                  "maintainer": user.get('maintainer', ''),
                  "auth_token": user.get('auth_token', ''),
              }
  
              resp["status"] = 200
              resp["success"] = True
              resp["message"] = "Success"
  
          else:
              resp["status"] = 401
              resp["message"] = "Invalid credentials"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['POST'], path='/products/$')
  @AuthenticationService.is_authenticated
  def create_product(request, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
      }
  
      try:
          body = request.get_post_body()
          Product.insert(**body)
  
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['GET'], path='/products/<qs>$')
  def list_product(request, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
          "products": [],
      }
  
      try:
          qs = request.get_query_string()
  
          resp["products"] = Product.page(
              like={'name': qs.get('name')} if qs.get('name') else None,
              number=int(qs.get('page') or '1'),
              limit=int(qs.get('limit') or '10'),
          )
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['GET'], path='/products/(?P<product_code>\w+)/$')
  def get_product(request, product_code, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
          "product": {},
      }
  
      try:
          product = Product.get(where={'code': product_code})
  
          if not product:
              raise Exception('No product for the given code')
  
          resp["product"] = product
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['PUT', 'PATCH'], path='/products/(?P<product_code>\w+)/$')
  @AuthenticationService.is_authenticated
  def update_product(request, product_code, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
      }
  
      try:
          product = Product.get(where={'code': product_code})
  
          if not product:
              raise Exception('No product for the given code')
  
          body = request.get_post_body()
          Product.update(where={'code': product_code}, updation=body)
  
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  
  
  @app.route(methods=['DELETE'], path='/products/(?P<product_code>\w+)/$')
  @AuthenticationService.is_authenticated
  def delete_product(request, product_code, *args, **kwargs):
      resp = {
          "status": 400,
          "success": False,
          "message": "",
      }
  
      try:
          product = Product.get(where={'code': product_code})
  
          if not product:
              raise Exception('No product for the given code')
  
          Product.delete(where={'code': product_code})
  
          resp["status"] = 200
          resp["success"] = True
          resp["message"] = "Success"
  
      except Exception as e:
          resp['message'] = str(e)
  
      return resp
  