Handling boundary split into several parts in email headers

[sofl88]

Hello

First of all, I'd be fine if this can't be fixed. I tried opening/viewing the email in other clients like mozilla thunderbird and they had trouble showing the containing html part and attachments (it looked like an empty email with no attachments).

There was a conversation with a customer who uses protonmail (I assume it was protonmail because there was a protonmail_quote class in the reply). The initial thread (started by the customer) had no boundary keyword in the source code.

We replied to this email and the next reply by the customer, threw this on fetching

freescout/overrides/webklex/php-imap/src/Query/Query.php

Line 323 in d9ada9c

throw new GetMessagesFailedException($e->getMessage(), 0, $e);

which is based on (I guess)

freescout/overrides/webklex/php-imap/src/Structure.php

Line 198 in d9ada9c

throw new MessageContentFetchingException("no content found", 0);

I'm not allowed to send you the full eml because of privacy reasons but debugging it myself, it turned out that there was a boundary definition but it was below the header part.

...
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/pgp-signature";
 micalg="pgp-sha256";
 boundary*0*=us-ascii''------3f0eb27c226a6efc44713e1b8f40befd34d8d3c9199e2ad0;
 boundary*1*=4dab9839cbbd3524; charset="utf-8"
Subject: xxx
From: xxx.mozmail.com
To: xxx
Reply-To: xxx.mozmail.com
Message-ID: <01010193e3541c82-eb777366-8e63-40b1-b965-b5744281949e-000000@us-west-2.amazonses.com>
Date: Fri, 20 Dec 2024 09:09:20 +0000
Feedback-ID: ::1.us-west-2.ITvMGFKQSliLUDgUkj88cpkYooqNc9k/L6kQx85KKBU=:AmazonSES
X-SES-Outgoing: 2024.12.20-76.223.145.248
X-Dmarc-Test: Allow
X-Spamd-Bar: -----
X-KasLoop: yyy

This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--------3f0eb27c226a6efc44713e1b8f40befd34d8d3c9199e2ad04dab9839cbbd3524
Content-Type: multipart/mixed; boundary=-------------------d39fee57ea0e0a2198fb268551febf6e

---------------------d39fee57ea0e0a2198fb268551febf6e
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=utf-8
...

When it comes to match the boundary defintion, $this->raw ends with X-KasLoop: yyy

freescout/overrides/webklex/php-imap/src/Header.php

Line 160 in d9ada9c

if (preg_match_all($pattern, $this->raw, $matches)) {

So I think since the boundary is not properly extracted, the error occurs.

PHP version: 8.3
FreeScout version: 1.8.70
Database: MySQL
Are you using CloudFlare: No
Are you using non-official modules: Yes

Thanks in advance

[freescout-help]

It looks like the boundary in headers was too long and it was split into two parts:

 boundary*0*=us-ascii''------3f0eb27c226a6efc44713e1b8f40befd34d8d3c9199e2ad0;
 boundary*1*=4dab9839cbbd3524; charset="utf-8"

For now Webklex/php-imap library can't handle such cases.