Django call Alipay interface code example details

from datetime import datetime
from  import RSA
from  import PKCS1_v1_5
from  import SHA256
from  import quote_plus
from base64 import decodebytes, encodebytes
import json

class AliPay(object):
  """
  Alipay payment interface(PCend-to-end payment interface)
  """
  def __init__(self, appid, app_notify_url, app_private_key_path,
         alipay_public_key_path, return_url, debug=False):
     = appid
    self.app_notify_url = app_notify_url
    self.app_private_key_path = app_private_key_path
    self.app_private_key = None
    self.return_url = return_url
    with open(self.app_private_key_path) as fp:
      self.app_private_key = (())
    self.alipay_public_key_path = alipay_public_key_path
    with open(self.alipay_public_key_path) as fp:
      self.alipay_public_key = (())

    if debug is True:
      self.__gateway = "/"
    else:
      self.__gateway = "/"

  def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):
    biz_content = {
      "subject": subject,
      "out_trade_no": out_trade_no,
      "total_amount": total_amount,
      "product_code": "FAST_INSTANT_TRADE_PAY",
      # "qr_pay_mode":4
    }

    biz_content.update(kwargs)
    data = self.build_body("", biz_content, self.return_url)
    return self.sign_data(data)

  def build_body(self, method, biz_content, return_url=None):
    data = {
      "app_id": ,
      "method": method,
      "charset": "utf-8",
      "sign_type": "RSA2",
      "timestamp": ().strftime("%Y-%m-%d %H:%M:%S"),
      "version": "1.0",
      "biz_content": biz_content
    }

    if return_url is not None:
      data["notify_url"] = self.app_notify_url
      data["return_url"] = self.return_url

    return data

  def sign_data(self, data):
    ("sign", None)
    # Sorted strings
    unsigned_items = self.ordered_data(data)
    unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items)
    sign = (unsigned_string.encode("utf-8"))
    # ordered_items = self.ordered_data(data)
    quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in unsigned_items)

    # Get the final order information string
    signed_string = quoted_string + "&sign=" + quote_plus(sign)
    return signed_string

  def ordered_data(self, data):
    complex_keys = []
    for key, value in ():
      if isinstance(value, dict):
        complex_keys.append(key)

    # Dump out the dictionary type data
    for key in complex_keys:
      data[key] = (data[key], separators=(',', ':'))

    return sorted([(k, v) for k, v in ()])

  def sign(self, unsigned_string):
    # Start counting signatures
    key = self.app_private_key
    signer = PKCS1_v1_5.new(key)
    signature = ((unsigned_string))
    # base64 encoding, convert to unicode and remove carriage return
    sign = encodebytes(signature).decode("utf8").replace("\n", "")
    return sign

  def _verify(self, raw_content, signature):
    # Start counting signatures
    key = self.alipay_public_key
    signer = PKCS1_v1_5.new(key)
    digest = ()
    (raw_content.encode("utf8"))
    if (digest, decodebytes(("utf8"))):
      return True
    return False

  def verify(self, data, signature):
    if "sign_type" in data:
      sign_type = ("sign_type")
    # Sorted strings
    unsigned_items = self.ordered_data(data)
    message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items)
    return self._verify(message, signature)

from  import render, redirect, HttpResponse
from  import AliPay
import json
import time
def ali():
  # Sandbox environment address: /platform/?tab=info
  app_id = "2016092000554611"
  # Alipay receives the user's payment, will be sent to the merchant two requests, a get request, a post request
  # POST requests for final detection
  notify_url = "http://42.56.89.12:80/page2/"
  # GET requests for page jump displays
  return_url = "http://42.56.89.12:80/page2/"
  merchant_private_key_path = "keys/app_private_2048.txt"
  alipay_public_key_path = "keys/alipay_public_2048.txt"
  # Generate an AliPay object
  alipay = AliPay(
    appid=app_id,
    app_notify_url=notify_url,
    return_url=return_url,
    app_private_key_path=merchant_private_key_path,
    alipay_public_key_path=alipay_public_key_path, # Alipay's public key, used to authenticate Alipay's return messages, not your own public key
    debug=True, # False by default, #
  )
  return alipay


def page1(request):
  if  == "GET":

    return render(request, '')
  else:
    money = float(('money'))
    # Generate an object
    alipay = ali()
    # generate payment url
    # object calls direct_pay
    query_params = alipay.direct_pay(
      subject="Inflatables.", # A brief description of the product
      out_trade_no="x2" + str(()), # Merchant Order Number
      total_amount=money, # Transaction amount (in dollars) Retain two decimal places.
    )

    pay_url = "/?{}".format(query_params)
    print(pay_url)
    # Send a get request to this address
    return redirect(pay_url)


def page2(request):
  alipay = ali()
  if  == "POST":
    # Detect if payment was successful
    # Go to the request body and get all the returned data: status/order number
    from  import parse_qs
    body_str = ('utf-8')
    print(body_str)

    post_data = parse_qs(body_str)
    print('Paypal gave me the data:::---------',post_data)
    post_dict = {}
    for k, v in post_data.items():
      post_dict[k] = v[0]
    print('Dictionary after spinning',post_dict)

    sign = post_dict.pop('sign', None)
    status = (post_dict, sign)
    print('POST validation', status)
    return HttpResponse('POST return')

  else:
    params = ()
    sign = ('sign', None)
    status = (params, sign)
    print('GET Validation', status)
    return HttpResponse('Payment successful')