implement response processing from xe

xexe/rate_fetching.py

@@ -1,8 +1,9 @@
 import datetime
 import os
 from abc import ABC, abstractmethod
+from decimal import Decimal
 
-from money.currency import Currency
+from money.currency import Currency, CurrencyHelper
 from money.money import Money
 from xecd_rates_client import XecdClient
 
@@ -63,4 +64,18 @@ class XERateFetcher(RateFetcher):
             # 1 unit of from_curr get us.
         )
 
-        # handle response into proper object
+        from_currency = Currency(response["from"])
+        to_currency = Currency(response["to"][0]["quotecurrency"])
+        rate_date = datetime.datetime.fromisoformat(
+            response["timestamp"].replace(
+                "Z", "+00:00"
+            )  # Funny replace is necessary because of API response format
+        ).date()
+        rate = f"""{response["to"][0]["mid"]:.{CurrencyHelper.decimal_precision_for_currency(to_currency)}f}"""
+
+        return ExchangeRate(
+            from_currency=from_currency,
+            to_currency=to_currency,
+            rate_date=rate_date,
+            rate=rate,
+        )