fixed crud list

fixed payments
upload -a

payments/services.py

@@ -0,0 +1,94 @@
+import base64
+import hashlib
+import hmac
+import urllib.parse
+from datetime import datetime, timedelta
+
+import requests
+
+from DepoT.settings import env
+
+
+class EPay:
+    payment_types = {
+        "pay_credit_card": "credit_paydirect",
+        "pay_epay": "paylogin",
+    }
+
+    @staticmethod
+    def encode_message(message):
+        encoded_data = base64.b64encode(message.encode("utf-8")).decode("utf-8")
+        secret_key = env("EPAY_SECURITY_KEY")
+        checksum = hmac.new(
+            secret_key.encode("utf-8"), encoded_data.encode("utf-8"), hashlib.sha1
+        ).hexdigest()
+        return encoded_data, checksum
+
+    @classmethod
+    def generate_urls(self, invoice, amount):
+        client_id = env("EPAY_CLIENT_ID")
+        description = f"Invoice number: {invoice} with amount of {amount}"
+        currency = "BGN"
+        expiry = (
+            datetime.today() + timedelta(days=int(env("INVOICE_EXPIRE_PERIOD")))
+        ).strftime("%d.%m.%Y")
+
+        if amount == 0:
+            amount = 1000
+
+        message = f"MIN={client_id}\nINVOICE={invoice}\nAMOUNT={amount}\nCURRENCY={currency}\nEXP_TIME={expiry}\nDESCR={description}"
+        encoded_data, checksum = EPay.encode_message(message)
+        result = {}
+        for pay_type, keyword in EPay.payment_types.items():
+            url = f"https://demo.epay.bg/?PAGE={keyword}&ENCODED={urllib.parse.quote(encoded_data)}&CHECKSUM={urllib.parse.quote(checksum)}"
+            result[pay_type] = url
+        return result
+
+    @staticmethod
+    def payment_result(encoded_data, checksum_received):
+        secret_key = env("EPAY_SECURITY_KEY")
+        decoded_data = base64.b64decode(encoded_data).decode("utf-8")
+        checksum_calculated = hmac.new(
+            secret_key.encode("utf-8"), encoded_data.encode("utf-8"), hashlib.sha1
+        ).hexdigest()
+        checksum_result = checksum_calculated == checksum_received
+
+        fields = decoded_data.split(":")
+        fields_dict = {}
+        for field in fields:
+            try:
+                name, value = field.split("=")
+            except ValueError:
+                print(fields)
+                print(field)
+
+            fields_dict[name] = value
+
+        return fields_dict, checksum_result
+
+    @staticmethod
+    def send_response(encoded_data, checksum):
+        url = f"https://demo.epay.bg/?ENCODED={urllib.parse.quote(encoded_data)}&CHECKSUM={urllib.parse.quote(checksum)}"
+        print(url)
+        res = requests.post(url)
+
+    @staticmethod
+    def send_ok(invoice):
+        message = f"INVOICE={invoice}:STATUS=OK"
+        encoded_data, checksum = EPay.encode_message(message)
+        print(f"OK {invoice}")
+        EPay.send_response(encoded_data, checksum)
+
+    @staticmethod
+    def send_no(invoice):
+        message = f"INVOICE={invoice}:STATUS=NO"
+        encoded_data, checksum = EPay.encode_message(message)
+        print(f"NO {invoice}")
+        EPay.send_response(encoded_data, checksum)
+
+    @staticmethod
+    def send_err(invoice):
+        message = f"INVOICE={invoice}:STATUS=ERR:ERR=BAD_CHECKSUM"
+        encoded_data, checksum = EPay.encode_message(message)
+        print(f"ERR {invoice}")
+        EPay.send_response(encoded_data, checksum)