Stage 03.4 - private auth skeleton

app/src/integrations/exchange/auth.py

@@ -0,0 +1,25 @@
+
+import hmac
+import hashlib
+import time
+
+
+class ExchangeAuth:
+    def __init__(self, api_key: str, api_secret: str):
+        self.api_key = api_key
+        self.api_secret = api_secret.encode()
+
+    def sign(self, query: str) -> str:
+        return hmac.new(self.api_secret, query.encode(), hashlib.sha256).hexdigest()
+
+    def build_headers(self):
+        return {
+            "X-MBX-APIKEY": self.api_key,
+        }
+
+    def build_signed_params(self, params: dict):
+        params["timestamp"] = int(time.time() * 1000)
+        query = "&".join(f"{k}={v}" for k, v in params.items())
+        signature = self.sign(query)
+        params["signature"] = signature
+        return params