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Implement a recursive multipart parser to cater for attachments that

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have embedded attachments.
This commit is contained in:
Christopher Broderick 2023-07-16 14:55:18 +01:00
parent 67eb0974c7
commit 707cc6761b
1 changed files with 48 additions and 10 deletions
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58
helpdesk/email.py
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@ -734,7 +734,7 @@ def extract_part_data(
if name:
name = email.utils.collapse_rfc2231_value(name)
part_body = None
part_full_body = None
formatted_body = None
if part.get_content_maintype() == 'text' and name is None:
if part.get_content_subtype() == 'plain':
part_body = part.get_payload(decode=True)
@ -747,26 +747,26 @@ def extract_part_data(
if ticket_id is None and getattr(django_settings, 'HELPDESK_FULL_FIRST_MESSAGE_FROM_EMAIL', False):
# first message in thread, we save full body to avoid
# losing forwards and things like that
part_full_body = get_body_from_fragments(part_body)
formatted_body = get_body_from_fragments(part_body)
part_body = EmailReplyParser.parse_reply(part_body)
else:
# second and other reply, save only first part of the
# message
part_body = EmailReplyParser.parse_reply(part_body)
part_full_body = part_body
formatted_body = part_body
# workaround to get unicode text out rather than escaped text
part_body = get_encoded_body(part_body)
logger.debug("Discovered plain text MIME part")
else:
email_body = get_email_body_from_part_payload(part)
if not part_body and not part_full_body:
if not part_body and not formatted_body:
# no text has been parsed so far - try such deep parsing
# for some messages
altered_body = email_body.replace(
"</p>", "</p>\n").replace("<br", "\n<br")
mail = BeautifulSoup(str(altered_body), "html.parser")
part_full_body = mail.get_text()
formatted_body = mail.get_text()
if "<body" not in email_body:
email_body = f"<body>{email_body}</body>"
@ -793,7 +793,44 @@ def extract_part_data(
payload = part.as_string() if part.is_multipart() else part.get_payload(decode=True)
files.append(SimpleUploadedFile(name, payload, mimetypes.guess_type(name)[0]))
logger.debug("Found MIME attachment %s", name)
return part_body, part_full_body
return part_body, formatted_body
def recurse_multipart(
multipart: Message,
counter: int,
ticket_id: int,
files: List,
logger: logging.Logger
) -> Tuple[str, str]:
'''
The received MIME part could be a multipart with embedded multiparts and therefore requires recursion.
Recurse through the multipart structures trying to find the 1st body part that
provides the message body. It will try to find an HTML formatted part (contentType=text/html)
and a TEXT formatted part (contentType=text/plain) and return both
:param multipart:
:param counter:
:param ticket_id:
:param files:
:param logger:
'''
plain_msg = None
formatted_msg = None
for part in multipart.walk():
if part.get_content_maintype() == 'multipart':
continue
# See email.message_obj.Message.get_filename()
plain_body, formatted_body = recurse_multipart(
part, counter, ticket_id, files, logger) if part.get_content_maintype(
) == 'multipart' else extract_part_data(part, counter, ticket_id, files, logger)
# Only update the message variables if they are still empty to handle attached messages overriding the core message
if plain_msg is None and plain_body:
plain_msg = plain_body
if formatted_msg is None and formatted_body:
formatted_msg = formatted_body
counter += 1
return plain_msg, formatted_msg
def object_from_message(message: str,
@ -841,10 +878,11 @@ def object_from_message(message: str,
if part.get_content_maintype() == 'multipart':
continue
# See email.message_obj.Message.get_filename()
part_body, part_full_body = extract_part_data(part, counter, ticket_id, files, logger)
if part_body:
body = part_body
full_body = part_full_body
plain_body, formatted_body = extract_part_data(part, counter, ticket_id, files, logger)
if plain_body:
body = plain_body
if formatted_body:
full_body = formatted_body
counter += 1
if not body: