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<?php
namespace Aws\CloudTrail;
use Aws\S3\S3Client;
/**
* This class provides an easy way to read log files generated by AWS
* CloudTrail.
*
* CloudTrail log files contain data about your AWS API calls and are stored in
* Amazon S3. The log files are gzipped and contain structured data in JSON
* format. This class will automatically ungzip and decode the data, and return
* the data as an array of log records
*/
class LogFileReader
{
/** @var S3Client S3 client used to perform GetObject operations */
private $s3Client;
/**
* @param S3Client $s3Client S3 client used to retrieve objects
*/
public function __construct(S3Client $s3Client)
{
$this->s3Client = $s3Client;
}
/**
* Downloads, unzips, and reads a CloudTrail log file from Amazon S3
*
* @param string $s3BucketName The bucket name of the log file in Amazon S3
* @param string $logFileKey The key of the log file in Amazon S3
*
* @return array
*/
public function read($s3BucketName, $logFileKey)
{
// Create a command for getting the log file object
$command = $this->s3Client->getCommand('GetObject', [
'Bucket' => (string) $s3BucketName,
'Key' => (string) $logFileKey,
'ResponseContentEncoding' => 'x-gzip'
]);
// Make sure gzip encoding header is sent and accepted in order to
// inflate the response data.
$command['@http']['headers']['Accept-Encoding'] = 'gzip';
// Get the JSON response data and extract the log records
$result = $this->s3Client->execute($command);
$logData = json_decode($result['Body'], true);
return isset($logData['Records']) ? $logData['Records'] : [];
}
}
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