Fatal error: Class 'Aws\Common\Credentials\Credentials' not found

Thanks for updating, glad you got this working.

Hi,

I'm facing the same original scenario that is described in the issue description.

@kirtivaland , what do you mean by "installing proper files & packages under amazons3 and composer module" ? Can you write some instructions for this ?

Thanks,
Cristian

You need to use Composer Manager to fetch all of the upstream PHP libraries. If you use drush, it's automatic (just say yes when it asks to download them). See Installation and Patches in the README. It's worth reading the Composer Manager docs if you want to customize where composer libraries are stored on disk.

I tried to install this today using drush 6.2.0 and on php 5.5.

The automatic installation with composer failed with the following error:

[Composer\Repository\RepositorySecurityException]
  The contents of http://packagist.org/p/aws/aws-sdk-php$db01f5b4b2e7db1e4b0f
  3e5468b8b513a2e9c673da39f965519a3b67fcc93fec.json do not match its signatur
  e. This should indicate a man-in-the-middle attack. Try running composer ag
  ain and report this if you think it is a mistake.

However, I was able to navigate to the amazons3 module directory and run drush composer install. This downloaded all of the required libraries into sites/all/modules/contrib/amazons3/vendor but I still get the about error when trying to save my s3 credentials.

The vendor directory you created with composer install won't be loaded by Drupal. It looks like you probably just had a glitch in your internet connection that corrupted the download - can you try it again? Or, run 'composer update' in the vendor directory used by composer manager, and not in the S3 module itself.