Corrupted File from Uploading Bytes for Large Attachment Graph API

Question

I'm using the Microsoft Graph API to upload a large file to a message. After uploading all the bytes of the file, the size of the uploaded file looks correct, but it's always corrupted (if I open the file, it will say it's been corrupted and can't be read).

What might I be doing wrong here?

$attachment[] = [
    "contentBytes" => $someFileAttachment->getContentBytes(),
    'attachment' => [
        'AttachmentItem' =>
            new FileAttachment(
                [
                    "attachmentType" => "file",
                    "name" => $someFileAttachment->getName(),
                    "size" => $someFileAttachment->getSize()
                ]
            )
        ]
];

// upload the file to the draft message
$uploadSessionResult = $createUploadSession($attachment['attachment'], $draftMessageId, $emailAddress);

$fragSize = 320 * 1024;
$fileSize = $attachment['attachment']['AttachmentItem']->getSize();
$numFragments = ceil($fileSize / $fragSize);
$bytesRemaining = $fileSize;
$i = 0;

while ($i < $numFragments) {
    $chunkSize = $numBytes = $fragSize;
    $start = $i * $fragSize;
    $end = $i * $fragSize + $chunkSize - 1;
    $offset = $i * $fragSize;
    if ($bytesRemaining < $chunkSize) {
        $chunkSize = $numBytes = $bytesRemaining;
        $end = $fileSize - 1;
    }

    $stream = fopen('php://temp', 'r+');
    fwrite($stream, $attachment['contentBytes']);
    rewind($stream);
    $data = stream_get_contents($stream, $chunkSize, $offset);
    fclose($stream);

    $contentRange = "bytes " . $start . "-" . $end . "/" . $fileSize;

    $uploadBytes($uploadSessionResult->getUploadUrl(), $numBytes, $contentRange, $data);

    $i++;

    $bytesRemaining = $bytesRemaining - $chunkSize;
}

Answer 1

I had some similar issue before and this was the soloution for me. I hope it helps you too.

after:

$data = stream_get_contents($stream, $chunkSize, $offset);

add:

$data= pack("H" . strlen($data), $data);

PHP PACK