Public key-encrypted message named after "noname" didn't recognized as encrypted message based on its content

[martgil]

Description

We received a report send to flowcrypt compatibility account about a Public key-encrypted message attachment named after "noname" and another "noname" file where it contains Version: 1. The application used the Canary Mail.

The issue produces a seemingly blank page:

The noname file attachment content:

Reference: https://mail.google.com/mail/u/flowcrypt.compatibility@gmail.com/#inbox/FMfcgzGxTFXMFnDNbgknpqvXKtSmMgSK

[martgil]

We should be able to recognize each file based on their content types but upon checking, we somehow defaults the attachment type to application/octet-stream but didn't know the reason why so completely yet.

flowcrypt-browser/extension/js/common/core/attachment.ts

Line 75 in d4b2b95

this.type = attachmentMeta.type || 'application/octet-stream';

[sosnovsky]

application/octet-stream is a default mime type for unknown files, so for cases when we don't have any file type set - application/octet-stream is used

[martgil]

Thanks, Roma - that is right, I knew it later on right after. I'll have more information to add here when needed.