Settings Constants

All settings within WP Offload Media and the Assets Addon can be defined using two constants within your wp-config.php file.

WP Offload Media

define( 'AS3CF_SETTINGS', serialize( array(
    // Storage Provider ('aws', 'do', 'gcp')
    'provider' => 'aws',
    // Access Key ID for Storage Provider (aws and do only, replace '*')
    'access-key-id' => '********************',
    // Secret Access Key for Storage Providers (aws and do only, replace '*')
    'secret-access-key' => '**************************************',
    // GCP Key File Path (gcp only, absolute file path, not URL)
    // Make sure hidden from public website, i.e. outside site's document root.
    'key-file-path' => '/path/to/key/file.json',
    // Use IAM Roles on Amazon Elastic Compute Cloud (EC2) or Google Compute Engine (GCE)
    'use-server-roles' => false,
    // Bucket to upload files to
    'bucket' => 'mybucket',
    // Bucket region (e.g. 'us-west-1' - leave blank for default region)
    'region' => '',
    // Automatically copy files to bucket on upload
    'copy-to-s3' => true,
    // Enable object prefix, useful if you use your bucket for other files
    'enable-object-prefix' => true,
    // Object prefix to use if 'enable-object-prefix' is 'true'
    'object-prefix' => 'wp-content/uploads/',
    // Organize bucket files into YYYY/MM directories matching Media Library upload date
    'use-yearmonth-folders' => true,
    // Append a timestamped folder to path of files offloaded to bucket to avoid filename clashes and bust CDN cache if updated
    'object-versioning' => true,
    // Delivery Provider ('storage', 'aws', 'do', 'gcp', 'cloudflare', 'keycdn', 'stackpath', 'other')
    'delivery-provider' => 'storage',
    // Custom name to display when using 'other' Delivery Provider
    'delivery-provider-name' => 'Akamai',
    // Rewrite file URLs to bucket
    'serve-from-s3' => true,
    // Use a custom domain (CNAME), not supported when using 'storage' Delivery Provider
    'enable-delivery-domain' => false,
    // Custom domain (CNAME), not supported when using 'storage' Delivery Provider
    'delivery-domain' => 'cdn.example.com',
    // Enable signed URLs for Delivery Provider that uses separate key pair (currently only 'aws' supported, a.k.a. CloudFront)
    'enable-signed-urls' => false,
    // Access Key ID for signed URLs (aws only, replace '*')
    'signed-urls-key-id' => '********************',
    // Key File Path for signed URLs (aws only, absolute file path, not URL)
    // Make sure hidden from public website, i.e. outside site's document root.
    'signed-urls-key-file-path' => '/path/to/key/file.pem',
    // Private Prefix for signed URLs (aws only, relative directory, no wildcards)
    'signed-urls-object-prefix' => 'private/',
    // Serve files over HTTPS
    'force-https' => false,
    // Remove the local file version once offloaded to bucket
    'remove-local-file' => false,
    // DEPRECATED (use enable-delivery-domain): Bucket URL format to use ('path', 'cloudfront')
    //'domain' => 'path',
    // DEPRECATED (use delivery-domain): Custom domain if 'domain' set to 'cloudfront'
    //'cloudfront' => 'cdn.exmple.com',
) ) );

Assets Pull Addon

define( 'AS3CF_ASSETS_PULL_SETTINGS', serialize( array(
    // Rewrite enqueued style/script URLs to CDN domain
    'rewrite-urls' => false,
    // CDN domain to use
    'domain' => 'assets.example.com',
    // Serve files over HTTPS
    'force-https' => false,
) ) );

!!! IMPORTANT !!!

The above defines should be placed before:

/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

Assets Addon (Deprecated)

PLEASE NOTE: The Assets addon does not work with WP Offload Media 2.0 or later, please use the Assets Pull addon instead.

define( 'WPOS3_ASSETS_SETTINGS', serialize( array(
    // S3 bucket to upload assets
    'bucket' => 'mybucket',
    // S3 bucket region (e.g. 'us-west-1' - leave blank for default region)
    'region' => '',
    // Copy assets to S3 and rewrite URLs
    'enable-addon' => false,
    // Enable automatic scanning
    'enable-cron' => true,
    // Extensions to offload to S3
    'file-extensions' => 'css,js,jpg,jpeg,png,gif,woff,woff2,ttf,svg,eot,otf,ico',
    // S3 URL format to use ('path', 'cloudfront')
    'domain' => 'path',
    // Custom domain if 'domain' set to 'cloudfront'
    'cloudfront' => 'cdn.exmple.com',
    // Enable object prefix, useful if you use your bucket for other files
    'enable-script-object-prefix' => false,
    // Object prefix to use if 'enable-object-prefix' is 'true'
    'object-prefix' => '',
    // Serve files over HTTPS
    'force-https' => false,
    // Minify CSS and JS files
    'enable-minify' => true,
    // Enable excluding files from being minified
    'enable-minify-excludes' => true,
    // List of files to exclude from minification
    'minify-excludes' =>
        'wp-includes/js/jquery/jquery.js' . PHP_EOL .
        'wp-content/themes/twentyfifteen/js/skip-link-focus-fix.js',
    // Gzip files before offloading to S3
    'enable-gzip' => true,
    // Enable initiating a scan using a URL endpoint
    'enable-custom-endpoint' => false,
) ) );