fetch.py 文件源码

def decode(message_part):
    content_transfer_encoding = message_part.part["Content-Transfer-Encoding"]
    content_type = message_part.part["Content-Type"]
    payload = message_part.part.get_payload()

    if content_transfer_encoding == "base64":
        payload = base64.b64decode(payload)
    elif content_transfer_encoding == "quoted-printable":
        payload = quopri.decodestring(payload)

    # payload is already properly decoded, usually happens in plain text emails
    if isinstance(payload, str):
        return payload

    # payload is text, decode with proper charset
    if is_text(content_type):
        return payload.decode(get_charset(content_type))

    # payload is probably binary, don't do anything else
    return payload