ConfigReader.php

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<?php

declare(strict_types=1);

namespace ILIAS\Setup\CLI;

use ILIAS\Setup\Agent;
use ILIAS\Setup\ArrayEnvironment;
use ILIAS\Setup\ObjectiveIterator;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Seld\JsonLint\JsonParser;

class ConfigReader
{
    protected JsonParser $json_parser;
    protected string $base_dir;

    public function __construct(JsonParser $json_parser, ?string $base_dir = null)
    {
        $this->json_parser = $json_parser;
        $this->base_dir = $base_dir ?? getcwd();
    }

    public function readConfigFile(string $name, array $overwrites = []): array
    {
        $name = $this->getRealFilename($name);
        if (!is_readable($name)) {
            throw new \InvalidArgumentException(
                "Config-file '$name' does not exist or is not readable."
            );
        }
        $json = $this->json_parser->parse(
            file_get_contents($name),
            JsonParser::PARSE_TO_ASSOC | JsonParser::DETECT_KEY_CONFLICTS
        );

        if (!is_array($json)) {
            throw new \InvalidArgumentException(
                "Could not find JSON-array in '$name'."
            );
        }
        return $this->applyOverwrites($json, $overwrites);
    }

    protected function applyOverwrites(array $json, array $overwrites): array
    {
        $replacer = null;
        $replacer = function ($subject, $path, $value) use (&$replacer) {
            if (count($path) === 0) {
                return $value;
            }
            $cur = array_shift($path);
            $subject[$cur] = $replacer($subject[$cur] ?? [], $path, $value);
            return $subject;
        };

        foreach ($overwrites as $path => $value) {
            $path = explode(".", (string) $path);
            $json = $replacer($json, $path, $value);
        }

        return $json;
    }

    protected function getRealFilename(string $name): string
    {
        if (in_array($name[0], ["/", "\\"])) {
            return $name;
        }
        return $this->base_dir . "/" . $name;
    }
}