wp-config.php

<?php

define('WP_CONTENT_DIR', dirname(__FILE__) . '/wp-content/');

$db = array_merge(['port' => 3306], parse_url(getenv('JAWSDB_URL')?:getenv('CLEARDB_DATABASE_URL')));
define('DB_NAME',     substr($db['path'], 1));
define('DB_USER',     $db['user']);
define('DB_PASSWORD', $db['pass']);
define('DB_HOST',     $db['host'].':'.$db['port']);
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');
$table_prefix  = 'wp_';

define('AWS_ACCESS_KEY_ID', getenv('AWS_ACCESS_KEY_ID')?:getenv('BUCKETEER_AWS_ACCESS_KEY_ID'));
define('AWS_SECRET_ACCESS_KEY', getenv('AWS_SECRET_ACCESS_KEY')?:getenv('BUCKETEER_AWS_SECRET_ACCESS_KEY'));
define('AS3CF_BUCKET', getenv('S3_BUCKET')?:getenv('BUCKETEER_BUCKET_NAME'));
if(getenv('S3_REGION')) define('AS3CF_REGION', getenv('S3_REGION'));

define('SENDGRID_AUTH_METHOD', 'credentials');
define('SENDGRID_USERNAME', getenv('SENDGRID_USERNAME'));
define('SENDGRID_PASSWORD', getenv('SENDGRID_PASSWORD'));
define('SENDGRID_SEND_METHOD', 'api');

define('AUTH_KEY',         getenv('WORDPRESS_AUTH_KEY')        ?:'put your unique phrase here');
define('SECURE_AUTH_KEY',  getenv('WORDPRESS_SECURE_AUTH_KEY') ?:'put your unique phrase here');
define('LOGGED_IN_KEY',    getenv('WORDPRESS_LOGGED_IN_KEY')   ?:'put your unique phrase here');
define('NONCE_KEY',        getenv('WORDPRESS_NONCE_KEY')       ?:'put your unique phrase here');
define('AUTH_SALT',        getenv('WORDPRESS_AUTH_SALT')       ?:'put your unique phrase here');
define('SECURE_AUTH_SALT', getenv('WORDPRESS_SECURE_AUTH_SALT')?:'put your unique phrase here');
define('LOGGED_IN_SALT',   getenv('WORDPRESS_LOGGED_IN_SALT')  ?:'put your unique phrase here');
define('NONCE_SALT',       getenv('WORDPRESS_NONCE_SALT')      ?:'put your unique phrase here');

define('FORCE_SSL_ADMIN', true);
define('FORCE_SSL_LOGIN', true);
if(isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') $_SERVER['HTTPS'] = 'on';

define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', false);
define('WP_DEBUG_LOG', false); // this is correct - we don't want errors to go to debug.log, but to the default destination

define('DISALLOW_FILE_MODS', true);

define('DISABLE_WP_CRON', in_array(getenv('DISABLE_WP_CRON'), ['true', '1', 'yes'], true) ? true : false);

if(!defined('ABSPATH')) define('ABSPATH', dirname(__FILE__) . '/wordpress/'); // should not be necessary

require_once(ABSPATH . 'wp-settings.php');

// installs using a Heroku button do not know the URL, so they use example.com as the site URL, which we need to fix
if(function_exists('get_option') && get_option('siteurl') == 'http://example.herokuapp.com') {
	update_option('siteurl', set_url_scheme($url = 'http://'.$_SERVER['HTTP_HOST']));
	header("Location: $url".$_SERVER['REQUEST_URI']);
	exit;
}