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email_mirror: Use .walk() to search all MIME parts for attachments.

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Fixes #13416

We used to search only one level in depth through the MIME structure,
and thus would miss attachments that were nested deeper (which can
happen with some email clients). We can take advantage of message.walk()
to iterate through each MIME part.
This commit is contained in:
Mateusz Mandera
2020-01-14 16:33:48 +01:00
committed by Tim Abbott
parent 5d2befdc54
commit f538f34d95
2 changed files with 41 additions and 8 deletions
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11
zerver/lib/email_mirror.py
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@@ -228,14 +228,9 @@ def filter_footer(text: str) -> str:
def extract_and_upload_attachments(message: message.Message, realm: Realm) -> str:
user_profile = get_system_bot(settings.EMAIL_GATEWAY_BOT)
attachment_links = []
payload = message.get_payload()
if not isinstance(payload, list):
# This is not a multipart message, so it can't contain attachments.
return ""
for part in payload:
for part in message.walk():
content_type = part.get_content_type()
filename = part.get_filename()
if filename:
@@ -251,7 +246,7 @@ def extract_and_upload_attachments(message: message.Message, realm: Realm) -> st
logger.warning("Payload is not bytes (invalid attachment %s in message from %s)." %
(filename, message.get("From")))
return "\n".join(attachment_links)
return '\n'.join(attachment_links)
def decode_stream_email_address(email: str) -> Tuple[Stream, Dict[str, bool]]:
token, options = decode_email_address(email)