34 lines
1.5 KiB
Python
34 lines
1.5 KiB
Python
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import requests
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from flask_restful import Resource
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from flask import jsonify, make_response
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from resources.shared import API_URL, ERROR_CURRENCY_CODE, ERROR_DATE_RANGE, VALID_CURRENCIES_C
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class DifferenceLast(Resource):
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def get(self, currency : str, num_days : int):
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"""
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Returns the highest difference between "ask" and "bid" values, and the day it occured.
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Weekends and holidays are skipped and do not count towards the 'num_days' limit."
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"""
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if not currency.upper() in VALID_CURRENCIES_C:
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return make_response(jsonify({"error": ERROR_CURRENCY_CODE}), 400)
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if not (num_days > 0 and num_days < 256):
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return make_response(jsonify({"error": ERROR_DATE_RANGE}), 400)
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url = f"{API_URL}/exchangerates/rates/c/{currency}/last/{num_days}/"
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response = requests.get(url)
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if response.status_code == 200:
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data = response.json()
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result = {"diff_max": 0, "date":""}
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for rate in data["rates"]:
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#ensure correct precision
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difference = round(rate["ask"] - rate["bid"],4)
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#spread can be negative on rare occasions
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if abs(difference) > abs(result["diff_max"]):
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result["diff_max"] = difference
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result["date"] = rate["effectiveDate"]
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return make_response(jsonify(result), 200)
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else:
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return make_response(jsonify({"error": response.text}), 400)
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