60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
import re
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from abc import ABC
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from abc import abstractmethod
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from datetime import datetime
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from decimal import Decimal
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from email.message import EmailMessage
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from email.message import Message
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from uuid import UUID
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from model import Transaction
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class TransactionParser(ABC):
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@abstractmethod
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def match(self, msg: Message) -> bool:
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pass
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@abstractmethod
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def extract(self, msg: EmailMessage) -> Transaction:
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pass
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class TransactionParsingFailed(Exception):
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pass
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class RogersBankParser(TransactionParser):
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EXTRACT_RE = re.compile(
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r"Attempt of \$(\d+\.\d{2}) was made on ([A-z]{3} \d{1,2}, \d{4})[^<]*at ([^<]+) in"
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)
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def __init__(self, account_id: UUID):
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self.account_id = account_id
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def match(self, msg: Message) -> bool:
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return (
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msg["From"] == "Rogers Bank <onlineservices@RogersBank.com>"
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and msg["Subject"] == "Purchase amount alert"
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)
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def extract(self, msg: EmailMessage) -> Transaction:
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body = msg.get_body()
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if body is None:
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raise TransactionParsingFailed("No body of message found")
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matches = RogersBankParser.EXTRACT_RE.search(body.as_string())
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if matches is None:
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raise TransactionParsingFailed("No matches for extraction RE")
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amount = Decimal(matches[1])
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date_raw = matches[2]
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payee = matches[3]
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date = datetime.strptime(date_raw, "%b %d, %Y").date()
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return Transaction(
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account=self.account_id,
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date=date,
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amount=amount,
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payee=payee,
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notes="via email",
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imported_id=msg["Message-ID"],
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)
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