AWS 3 with Symfony2 and Gaufrette

composer.json

{
    "require": {
        "knplabs/gaufrette": "dev-master",
        "knplabs/knp-gaufrette-bundle": "dev-master",
        "aws/aws-sdk-php": "dev-master"
    }
}

config.yml

knp_gaufrette:
    adapters:
        sylius_image:
            aws_s3:
                service_id: app.amazon_s3
                bucket_name:  "%amazon_s3.bucket_name%"

app:
    amazon_s3:
        key: "%amazon_s3.key%"
        secret: "%amazon_s3.secret%"
        region: "%amazon_s3.region%"
        version: "%amazon_s3.version%"
        bucket_name: "%amazon_s3.bucket_name%"
                

Configuration.php

<?php

namespace AppBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

class Configuration implements ConfigurationInterface
{
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode    = $treeBuilder->root('app');

        $rootNode
            ->children()
                ->arrayNode('amazon_s3')
                    ->children()
                        ->scalarNode('key')->defaultValue('EDITME')->end()
                        ->scalarNode('secret')->defaultValue('EDITME')->end()
                        ->scalarNode('region')->defaultValue('YOUR_BUCKET_REGION')->end()
                        ->scalarNode('version')->defaultValue('2006-03-01')->end()
                        ->scalarNode('bucket_name')->defaultValue('YOUR_BUCKET_NAME')->end()
                    ->end()
                ->end()
            ->end();

        return $treeBuilder;
    }
}

parameters.yml

# This file is auto-generated during the composer install
parameters:
    amazon_s3.key: EDITME
    amazon_s3.secret: EDITME
    amazon_s3.region: YOUR_BUCKET_REGION
    amazon_s3.version: '2006-03-01'
    amazon_s3.bucket_name: YOUR_BUCKET_NAME

services.yml

services:
    app.amazon_s3:
        class: Aws\S3\S3Client
        factory: [ Aws\S3\S3Client , factory]
        arguments:
            -
                region: "%amazon_s3.region%"
                version: "%amazon_s3.version%"
                credentials:
                    key: "%amazon_s3.key%"
                    secret: "%amazon_s3.secret%"

Update of https://gist.github.com/phpfour/6533329 with latest AWS 3 SDK (changed from amazonwebservices/aws-sdk-for-php to aws/aws-sdk-php)