transfer file from AWS s3 budget to ec2 instance using php - php

Question

I have been working on a project where we will have a website process on EC2 server. In my project, I was able to write a php code that allow users to upload file from web server to AWS S3 budget. However, in order to access that file from EC2, i think we need to transfer file from S3 budget to EC2 instance. I saw that there is a unix command line way to do that, but the project i'm working on is based on PHP/HTML/JSON. I wonder is there a way or tutorial to access or transfer file from S3 to EC2 instance using PHP?
Thanks

Answer 1

You do not need to transfer the file from S3 to EC2, in fact, this would be a waste of resources. Instead, you can generate a signed url pointing to the file directly on S3 (even if the bucket/file is private). This link can also be set to expire after a certain period. Here's an example using the AWS PHP SDK:
<?php
require 'aws-autoloader.php'; //SDK autoloader file
//*** Initiate an S3 client
$client = S3Client::factory(array(
'key' => "public_key",
'secret' => "private_key",
'region' => "your s3 region"
));
$url = $client->getObjectUrl("bucket_name", "full_object_name", "+1 minutes"[optional]);
echo $url; //Print the direct S3 link to the file, which will expire in 1 minute.
//This will work even if the bucket is private.
[update]
If you still need to download the file from S3 to EC2, do this:
<?php
require 'aws-autoloader.php'; //SDK autoloader file
//*** Initiate an S3 client
$client = S3Client::factory(array(
'key' => "public_key",
'secret' => "private_key",
'region' => "your s3 region"
));
$result = $client->getObject(array(
'Bucket' => "bucket_name",
'Key' => "name of file",
'SaveAs' => "ec2 path to save the file at"
));
echo $result; //make sure download worked.
Further reading:
http://docs.aws.amazon.com/aws-sdk-php/latest/class-Aws.S3.S3Client.html