def full_format_to_message_object(parts: Union[dict, list],
message: MIMEBase = None) -> MIMEBase:
if not message:
# This is the root part
maintype, subtype = parts["mimeType"].split("/", 1)
message = MIMEBase(maintype, subtype)
for header in parts["headers"]:
message[header["name"]] = header["value"]
if message.get_content_maintype() == "multipart":
full_format_to_message_object(parts["parts"], message)
else:
message.set_payload(parts["body"].get("data"))
else:
for part in parts:
if part["mimeType"].split("/")[0] == "multipart":
message_part = MIMEMultipart("mixed")
full_format_to_message_object(part["parts"], message_part)
message.attach(message_part)
else:
try:
maintype, subtype = part["mimeType"].split("/", 1)
except ValueError:
# There's no valid mimetype, I saw the python parser set the mimetype to text/plain
# when it did not understand the mimetype.
maintype, subtype = "text", "plain"
message_part = MIMEBase(maintype, subtype)
for header in part["headers"]:
message_part[header["name"]] = header["value"]
# Dispite the Content-Transfer-Encoding, it seems like everything is encoded
# in b64
data = base64.urlsafe_b64decode(part["body"].get("data",
"")).decode()
message_part.set_payload(data)
message.attach(message_part)
return message
