added WPCLI command

class S3_Uploads_WP_CLI_Command extends WP_CLI_Command {

	/**

     * Verifies the API keys entered will work for reading, writing, etc.

     *

     * @subcommand verify

     **/

    public function verify_api_keys() {

		S3_Uploads::get_instance(); // Boot

		$upload_dir = wp_upload_dir();

		// The upload file location on the local filesystem

		$s3_path = $upload_dir['basedir'] . '/' . mt_rand() . '.jpg';

		// Attempt to copy the file to S3

		WP_CLI::print_value( 'Uploading file '. $s3_path );

		$copy = copy(

			dirname( dirname(__FILE__) ) . '/tests/data/canola.jpg',

			$s3_path

		);

		// Check if copy worked

		if ( ! $copy ) {

			WP_CLI::error( 'Failed to copy '. $s3_path );

			return;

		}

		// Delete off S3

		WP_CLI::print_value( 'Deleting file '. $s3_path );

		$delete = unlink( $s3_path );

		// Check that delete worked

		if ( ! $delete ) {

			WP_CLI::error( 'Failed to delete '. $s3_path );

			return;

		}

		WP_CLI::success( 'Success' );

    }

	/**

	 * @subcommand migrate-attachments

	 * @synopsis [--delete-local]

	 */