Creating amazon aws s3 pre signed url PHP

Well, if anyone else has any trouble with this like I did, here is the answer, I went into the amazon php development forums and got help from the profesionals.

It seems you may be flip-flopping between Version 2 and Version 3 of the SDK or looking at the wrong document. Make sure you are getting the one you intend to use and are looking at the correct documentation. They are different.

V3 - Composer Requirement: {"aws/aws-sdk-php": "~3.0"} - User Guide: http://docs.aws.amazon.com/aws-sdk-php/v3/guide/index.html - API Docs: http://docs.aws.amazon.com/aws-sdk-php/v3/api/index.html - Pre-signed URL Docs: http://docs.aws.amazon.com/aws-sdk-php/v3/guide/service/s3-presigned-url.html

V2 - Composer Requirement: {"aws/aws-sdk-php": "~2.8"} - User Guide: http://docs.aws.amazon.com/aws-sdk-php/v2/guide/index.html - API Docs: http://docs.aws.amazon.com/aws-sdk-php/v2/api/index.html - Pre-signed URL Docs: http://docs.aws.amazon.com/aws-sdk-php/v2/guide/service-s3.html#creating-a-pre-signed-url

Mini step-by-step guide of what you have to do:

1.Install composer, preferably using sudo:

    sudo curl -sS https://getcomposer.org/installer | sudo php

2.Go to your project folder and create a composer.json file, with the version you want/need, you can find releases here: https://github.com/aws/aws-sdk-php/releases, commands for each version seem to be very version specific, be careful, this was my main problem.

{
    "require": {
        "aws/aws-sdk-php": "~3.0"
    }

}

3.Then go to your project folder in the terminal, and install sdk via composer and update afterward like: (if you change version you have to update again.)

    sudo php composer.phar install
    sudo php composer.phar update

4.Then everything is ready for you to follow proper version documentation, in my case for version "aws/aws-sdk-php": "~3.0" and for presigned url, what worked was:

    require 'vendor/autoload.php';
    use Aws\S3\S3Client;
    use Aws\S3\Exception\S3Exception;

    $sharedConfig = [
        'region'  => 'us-west-1',
        'version' => 'latest'
    ]; //I have AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY as environment variables

    $s3Client = new Aws\S3\S3Client($sharedConfig);

    $cmd = $s3Client->getCommand('GetObject', [
        'Bucket' => $bucket,
        'Key'    => $keyname
    ]);

    $request = $s3Client->createPresignedRequest($cmd, '+20 minutes');
    $presignedUrl = (string) $request->getUri();
    echo $presignedUrl;

I hope this helps anyone facing the same problems as I did.

If you're using Laravel you can easily get a temporary URL for S3, as documented here: https://laravel.com/docs/master/filesystem#file-urls

Example of your Image model would be:

class Image extends Model
{

    ...

    public function getTemporaryUrlAttribute()
    {
        return Storage::disk('s3')->temporaryUrl(
            $this->path,
            now()->addSeconds(10)
        );
    }
}

Then in your HTML it would be:

<img width="100px" src="{{$image->temporaryUrl}}">