Amazon S3 PHP SDK, Transfer folder, but skip specific files? - amazon-s3

Question

I am using the Amazon PHP SDK to upload a folder on my server to a bucket. This is working great:
$skip = ['index.html', '_metadata.txt', '_s3log.txt'];
$meta = [
'key' => $options->EWRbackup_s3_key,
'region' => $options->EWRbackup_s3_region,
'bucket' => $options->EWRbackup_s3_bucket,
'directory' => 's3://'.$options->EWRbackup_s3_bucket.'/'.$subdir,
];
$client = new S3Client([
'version' => 'latest',
'region' => $meta['region'],
'credentials' => [
'key' => $meta['key'],
'secret' => $options->EWRbackup_s3_secret,
]
]);
$s3log = fopen($subpath.'/_s3log.txt', 'w+');
fwrite($s3log, "-- Connecting to ".$meta['region'].":".$meta['bucket']."...\n");
$manager = new Transfer($client, $subpath, $meta['directory'], [
'before' => function ($command)
{
$filename = basename($command->get('SourceFile'));
fwrite($this->s3log, "-- Sending file $filename...\n");
},
]);
$manager->transfer();
fwrite($s3log, "-- Disconnecting from ".$meta['key'].":".$meta['bucket']."...");
fclose($s3log);
However, in the folder I am uploading using the Transfer method, there are 3 files I want to skip. They are defined in the $skip variable on line one. I was wondering if there was a way I could get the Transfer to skip these 3 files...

Answer 1

I modified the AWS client in a WordPress plugin I created. The AWS/S3/Transfer.php file is where the uploads are managed, in this case. I modified the private function upload($filename) to look for a boolean return value from the before function:
private function upload($filename)
{
$args = $this->s3Args;
$args['SourceFile'] = $filename;
$args['Key'] = $this->createS3Key($filename);
$command = $this->client->getCommand('PutObject', $args);
if ($this->before) {
if (false!==call_user_func($this->before, $command)) {
return $this->client->executeAsync($command);
}
} else {
return $this->client->executeAsync($command);
}
}
This replaces the original lines:
$this->before and call_user_func($this->before, $command);
return $this->client->executeAsync($command);
with
if ($this->before) {
if (false!==call_user_func($this->before, $command)) {
return $this->client->executeAsync($command);
}
} else {
return $this->client->executeAsync($command);
}
Then, in your declared before function, you can return false if you do not want this particular file uploaded.
I was able to do this because I can control when the AWS PHP SDK is updated and can therefore modify the code it contains. I have not found any hooks in the PHP SDK to do this in a better way.