FileOrContentEnvVarProcessor.php

<?php declare(strict_types=1);

namespace App\Infra\Symfony;

use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
use Symfony\Component\DependencyInjection\Exception\EnvNotFoundException;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;

class FileOrContentEnvVarProcessor implements EnvVarProcessorInterface
{
    public function getEnv($prefix, $name, \Closure $getEnv)
    {
        if (0 !== substr_compare($name, '_FILE', -strlen('_FILE'))) {
            throw new \LogicException(sprintf('The env var must end with _FILE. Got %s', $name));
        }

        try {
            $file = $getEnv($name);
        } catch (EnvNotFoundException $originalException) {
            $orName = substr($name, 0, -strlen('_FILE'));

            try {
                return $getEnv($orName);
            } catch (EnvNotFoundException $e) {
                throw new EnvNotFoundException(sprintf('Environment variable not found: "%s" nor "%s".', $name, $orName), null, $originalException);
            }
        }

        if (!is_scalar($file)) {
            throw new RuntimeException(sprintf('Invalid file name: env var "%s" is non-scalar.', $name));
        }
        if (!file_exists($file)) {
            throw new EnvNotFoundException(sprintf('File "%s" not found (resolved from "%s").', $file, $name));
        }

        return file_get_contents($file);
    }

    public static function getProvidedTypes()
    {
        return [
            'fileor' => 'string',
        ];
    }
}