procurement-ingest/lambdas/shared/email_parsing.py

import email
from email import policy


def parse_raw_email(raw_bytes: bytes) -> dict:
    """Parse a raw email into subject, sender, body text."""
    msg = email.message_from_bytes(raw_bytes, policy=policy.default)

    subject = msg.get("Subject", "")
    sender = msg.get("From", "")
    to = msg.get("To", "")
    cc = msg.get("Cc", "")
    date = msg.get("Date", "")

    body = ""
    if msg.is_multipart():
        for part in msg.walk():
            content_type = part.get_content_type()
            if content_type == "text/plain":
                body = part.get_content()
                break
            elif content_type == "text/html" and not body:
                body = part.get_content()
    else:
        body = msg.get_content()

    return {
        "subject": subject,
        "sender": sender,
        "to": to,
        "cc": cc,
        "date": date,
        "body": body,
    }