akari-bot/modules/exchange_rate/__init__.py

import datetime

from config import Config
from core.builtins import Bot
from core.component import module
from core.exceptions import NoReportException
from core.utils.http import get_url

exchange_rate = module('exchange_rate',
                       desc='{exchange_rate.help.desc}',
                       alias={'exchangerate': 'exchange_rate',
                              'excr': 'exchange_rate'},
                       developers=['DoroWolf'])

api_key = Config('exchange_rate_api_key')


@exchange_rate.command('<amount> <base> <target> {{exchange_rate.help}}')
async def _(msg: Bot.MessageSession):
    base_currency = msg.parsed_msg['<base>'].upper()
    target_currency = msg.parsed_msg['<target>'].upper()

    url = f'https://v6.exchangerate-api.com/v6/{api_key}/codes'
    response = await get_url(url, fmt='read')
    if response.status_code == 200:
            data = response.json()
            supported_currencies = data['supported_codes']
            unsupported_currencies = []
            if base_currency not in supported_currencies:
                unsupported_currencies.append(base_currency)
            if target_currency not in supported_currencies:
                unsupported_currencies.append(target_currency)
            if unsupported_currencies:
                await msg.finish(f"{msg.locale.t('exchange_rate.message.error.invalid')}{', '.join(unsupported_currencies)}")
    else:
        data = response.json()
        error_type = data['error-type']
        raise NoReportException(f"{error_type}")

    amount = None
    while amount is None:
        try:
            amount = float(msg.parsed_msg['<amount>'])
            if amount <= 0:
                await msg.finish(msg.locale.t('exchange_rate.message.error.non_positive'))
        except ValueError:
            await msg.finish(msg.locale.t('exchange_rate.message.error.non_digital'))

    url = f'https://v6.exchangerate-api.com/v6/{api_key}/pair/{base_currency}/{target_currency}/{amount}'
    response = await get_url(url, fmt='read')

    if response.status_code == 200:
        data = response.json()
        exchange_rate = data['conversion_result']
        current_time = datetime.datetime.now().strftime("%Y-%m-%d")
        await msg.finish(
            msg.locale.t('exchange_rate.message', amount=amount, base=base_currency, exchange_rate=exchange_rate,
                         target=target_currency, time=current_time))
    else:
        data = response.json()
        error_type = data['error-type']
        raise NoReportException(f"{error_type}")