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fix for mails containing only a PDF but with a correct Content-Transfer-Encoding: base64

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This commit is contained in:
ralf 2024-03-08 13:19:04 +02:00
parent 0260b8723a
commit f9f6700f8a
1 changed files with 38 additions and 15 deletions
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53
api/src/Mail.php
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@ -4999,9 +4999,9 @@ class Mail
}
// if message is just a pdf, return it to browser to display
if ($_structure->getType() === 'application/pdf')
if ($_structure->getType() === 'application/pdf' || $_structure->getPrimaryType() === 'image')
{
header('Content-Type: application/pdf');
header('Content-Type: '.$_structure->getType());
echo $this->getAttachment($_uid, $_partID ?? '1', 0, true, $_folder)->getContents();
exit();
}
@ -5093,7 +5093,7 @@ class Mail
/**
* normalizeBodyParts - function to gather and normalize all body Information
* as we may recieve a bodyParts structure from within getMessageBody nested deeper than expected
* as we may receive a bodyParts structure from within getMessageBody nested deeper than expected
* so this is used to normalize the output, so we are able to rely on our expectation
* @param _bodyParts - Body Array
* @return array - a normalized Bodyarray
@ -6216,6 +6216,35 @@ class Mail
return $attachment;
}
/**
* Check if part is binary e.g. a PDF or an image and claims not to be transfer-encoded --> fix it
*
* This works under the assumption, that no one really sends binary data unencoded through mail!
* Therefore, we assume it must be already base64 encoded, just the header was forgotten.
*
* This violates the mime-rfc, which states explicit that no Content-Transfer-Encoding header means "binary"!
* Horde_Mime_Part does NOT allow to check if we have no Content-Transfer-Type header, or it has the value "binary".
*
* Another approach would be to check the data-stream, if it is really base64 encoded or not ...
*
* Some broken clients e.g. SAP Netweaver sends mails containing only a base64 decoded PDF, but set NO Content-Transfer-Type: base64.
*
* @param Horde_Mime_Part $part
* @return Horde_Mime_Part
*/
public static function fixBinaryPart(Horde_Mime_Part $part)
{
// if we have no text body, but only a PDF or an image AND transfer-encoding is NOT base64,
// set binary, as it's already base64 transfer-encoded but lacks the necessary header
if (($part->getType() === 'application/pdf' || $part->getPrimaryType() === 'image') &&
// hack to read protected $structure->_transfer_encoding
unserialize($part->serialize())[9] !== 'base64')
{
$part->setTransferEncoding('binary', ['send' => true]);
}
return $part;
}
/**
* Fetch and add contents to a part
*
@ -6234,13 +6263,13 @@ class Mail
$encoding = null;
$fetchAsBinary = true;
if ($_mimetype && strtolower($_mimetype)=='message/rfc822') $fetchAsBinary = false;
self::fixBinaryPart($part);
// we need to set content on structure to decode transfer encoding
$part->setContents(
$this->getBodyPart($_uid, $part->getMimeId(), null, $_preserveSeen, $_stream, $encoding, $fetchAsBinary),
// some mailers e.g. "SAP NetWeaver 750" send just the PDF, with no body or multipart
// AND therefore NO transfer-encoding --> use base64 when fetching as binary
array('encoding' => !isset($part->parent) && $fetchAsBinary && $part->getType() === 'application/pdf' ? 'base64' :
(!$fetchAsBinary&&!$encoding?'8bit':$encoding)));
array('encoding' => !$fetchAsBinary&&!$encoding?'8bit':$encoding));
return $part;
}
@ -7341,14 +7370,8 @@ class Mail
$structure->setTransferEncoding('8bit');
$structure->setCharset('utf-8');
}
// if we have no text body, but only a PDF or an image AND transfer-encoding is NOT base64,
// set binary, as it's already base64 transfer-encoded but lacks the necessary header
if (($structure->getType() === 'application/pdf' || $structure->getPrimaryType() === 'image') &&
// hack to read protected $structure->_transfer_encoding
unserialize($structure->serialize())[9] !== 'base64')
{
$structure->setTransferEncoding('binary', ['send' => true]);
}
self::fixBinaryPart($structure);
$mailer->setBasePart($structure);
//error_log(__METHOD__.__LINE__.':'.array2string($structure));