Create payment_processor.py

iot/iot_payment_systems/payment_processor.py

@@ -0,0 +1,37 @@
+import json
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.asymmetric import rsa
+from cryptography.hazmat.backends import default_backend
+
+class PaymentProcessor:
+    def __init__(self, public_key_file: str):
+        self.public_key_file = public_key_file
+        self.public_key = self.load_public_key()
+
+    def load_public_key(self) -> rsa.RSAPublicKey:
+        with open(self.public_key_file, "rb") as f:
+            return serialization.load_pem_public_key(f.read(), backend=default_backend())
+
+    def process_payment(self, payment_token: str) -> dict:
+        # Verify the payment token using the public key
+        try:
+            payment_info = self.public_key.verify(
+                bytes.fromhex(payment_token),
+                padding.OAEP(
+                    mgf=padding.MGF1(algorithm=hashes.SHA256()),
+                    algorithm=hashes.SHA256(),
+                    label=None
+                )
+            )
+            payment_info = json.loads(payment_info.decode())
+            # Process the payment
+            # ...
+            return {"payment_status": "success", "transaction_id": "1234567890"}
+        except Exception as e:
+            return {"payment_status": "failed", "error": str(e)}
+
+# Example usage
+processor = PaymentProcessor("public_key.pem")
+payment_token = "1234567890abcdef"
+response = processor.process_payment(payment_token)
+print(response)  # Output: {"payment_status": "success", "transaction_id": "1234567890"}