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Filename : EnvVarProcessor.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\DependencyInjection;

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

/**
 * @author Nicolas Grekas <p@tchwork.com>
 */
class EnvVarProcessor implements EnvVarProcessorInterface
{
    private $container;
    private $loaders;
    private $loadedVars = [];

    /**
     * @param EnvVarLoaderInterface[] $loaders
     */
    public function __construct(ContainerInterface $container, \Traversable $loaders = null)
    {
        $this->container = $container;
        $this->loaders = $loaders ?? new \ArrayIterator();
    }

    /**
     * {@inheritdoc}
     */
    public static function getProvidedTypes()
    {
        return [
            'base64' => 'string',
            'bool' => 'bool',
            'not' => 'bool',
            'const' => 'bool|int|float|string|array',
            'csv' => 'array',
            'file' => 'string',
            'float' => 'float',
            'int' => 'int',
            'json' => 'array',
            'key' => 'bool|int|float|string|array',
            'url' => 'array',
            'query_string' => 'array',
            'resolve' => 'string',
            'default' => 'bool|int|float|string|array',
            'string' => 'string',
            'trim' => 'string',
            'require' => 'bool|int|float|string|array',
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getEnv(string $prefix, string $name, \Closure $getEnv)
    {
        $i = strpos($name, ':');

        if ('key' === $prefix) {
            if (false === $i) {
                throw new RuntimeException(sprintf('Invalid env "key:%s": a key specifier should be provided.', $name));
            }

            $next = substr($name, $i + 1);
            $key = substr($name, 0, $i);
            $array = $getEnv($next);

            if (!\is_array($array)) {
                throw new RuntimeException(sprintf('Resolved value of "%s" did not result in an array value.', $next));
            }

            if (!isset($array[$key]) && !\array_key_exists($key, $array)) {
                throw new EnvNotFoundException(sprintf('Key "%s" not found in %s (resolved from "%s").', $key, json_encode($array), $next));
            }

            return $array[$key];
        }

        if ('default' === $prefix) {
            if (false === $i) {
                throw new RuntimeException(sprintf('Invalid env "default:%s": a fallback parameter should be provided.', $name));
            }

            $next = substr($name, $i + 1);
            $default = substr($name, 0, $i);

            if ('' !== $default && !$this->container->hasParameter($default)) {
                throw new RuntimeException(sprintf('Invalid env fallback in "default:%s": parameter "%s" not found.', $name, $default));
            }

            try {
                $env = $getEnv($next);

                if ('' !== $env && null !== $env) {
                    return $env;
                }
            } catch (EnvNotFoundException $e) {
                // no-op
            }

            return '' === $default ? null : $this->container->getParameter($default);
        }

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

            if ('file' === $prefix) {
                return file_get_contents($file);
            } else {
                return require $file;
            }
        }

        if (false !== $i || 'string' !== $prefix) {
            $env = $getEnv($name);
        } elseif (isset($_ENV[$name])) {
            $env = $_ENV[$name];
        } elseif (isset($_SERVER[$name]) && !str_starts_with($name, 'HTTP_')) {
            $env = $_SERVER[$name];
        } elseif (false === ($env = getenv($name)) || null === $env) { // null is a possible value because of thread safety issues
            foreach ($this->loadedVars as $vars) {
                if (false !== $env = ($vars[$name] ?? false)) {
                    break;
                }
            }

            if (false === $env || null === $env) {
                $loaders = $this->loaders;
                $this->loaders = new \ArrayIterator();

                try {
                    $i = 0;
                    $ended = true;
                    $count = $loaders instanceof \Countable ? $loaders->count() : 0;
                    foreach ($loaders as $loader) {
                        if (\count($this->loadedVars) > $i++) {
                            continue;
                        }
                        $this->loadedVars[] = $vars = $loader->loadEnvVars();
                        if (false !== $env = $vars[$name] ?? false) {
                            $ended = false;
                            break;
                        }
                    }
                    if ($ended || $count === $i) {
                        $loaders = $this->loaders;
                    }
                } catch (ParameterCircularReferenceException $e) {
                    // skip loaders that need an env var that is not defined
                } finally {
                    $this->loaders = $loaders;
                }
            }

            if (false === $env || null === $env) {
                if (!$this->container->hasParameter("env($name)")) {
                    throw new EnvNotFoundException(sprintf('Environment variable not found: "%s".', $name));
                }

                $env = $this->container->getParameter("env($name)");
            }
        }

        if (null === $env) {
            if (!isset($this->getProvidedTypes()[$prefix])) {
                throw new RuntimeException(sprintf('Unsupported env var prefix "%s".', $prefix));
            }

            return null;
        }

        if (!is_scalar($env)) {
            throw new RuntimeException(sprintf('Non-scalar env var "%s" cannot be cast to "%s".', $name, $prefix));
        }

        if ('string' === $prefix) {
            return (string) $env;
        }

        if (\in_array($prefix, ['bool', 'not'], true)) {
            $env = (bool) (filter_var($env, \FILTER_VALIDATE_BOOLEAN) ?: filter_var($env, \FILTER_VALIDATE_INT) ?: filter_var($env, \FILTER_VALIDATE_FLOAT));

            return 'not' === $prefix ? !$env : $env;
        }

        if ('int' === $prefix) {
            if (false === $env = filter_var($env, \FILTER_VALIDATE_INT) ?: filter_var($env, \FILTER_VALIDATE_FLOAT)) {
                throw new RuntimeException(sprintf('Non-numeric env var "%s" cannot be cast to int.', $name));
            }

            return (int) $env;
        }

        if ('float' === $prefix) {
            if (false === $env = filter_var($env, \FILTER_VALIDATE_FLOAT)) {
                throw new RuntimeException(sprintf('Non-numeric env var "%s" cannot be cast to float.', $name));
            }

            return (float) $env;
        }

        if ('const' === $prefix) {
            if (!\defined($env)) {
                throw new RuntimeException(sprintf('Env var "%s" maps to undefined constant "%s".', $name, $env));
            }

            return \constant($env);
        }

        if ('base64' === $prefix) {
            return base64_decode(strtr($env, '-_', '+/'));
        }

        if ('json' === $prefix) {
            $env = json_decode($env, true);

            if (\JSON_ERROR_NONE !== json_last_error()) {
                throw new RuntimeException(sprintf('Invalid JSON in env var "%s": ', $name).json_last_error_msg());
            }

            if (null !== $env && !\is_array($env)) {
                throw new RuntimeException(sprintf('Invalid JSON env var "%s": array or null expected, "%s" given.', $name, get_debug_type($env)));
            }

            return $env;
        }

        if ('url' === $prefix) {
            $parsedEnv = parse_url($env);

            if (false === $parsedEnv) {
                throw new RuntimeException(sprintf('Invalid URL in env var "%s".', $name));
            }
            if (!isset($parsedEnv['scheme'], $parsedEnv['host'])) {
                throw new RuntimeException(sprintf('Invalid URL env var "%s": schema and host expected, "%s" given.', $name, $env));
            }
            $parsedEnv += [
                'port' => null,
                'user' => null,
                'pass' => null,
                'path' => null,
                'query' => null,
                'fragment' => null,
            ];

            // remove the '/' separator
            $parsedEnv['path'] = '/' === ($parsedEnv['path'] ?? '/') ? '' : substr($parsedEnv['path'], 1);

            return $parsedEnv;
        }

        if ('query_string' === $prefix) {
            $queryString = parse_url($env, \PHP_URL_QUERY) ?: $env;
            parse_str($queryString, $result);

            return $result;
        }

        if ('resolve' === $prefix) {
            return preg_replace_callback('/%%|%([^%\s]+)%/', function ($match) use ($name) {
                if (!isset($match[1])) {
                    return '%';
                }
                $value = $this->container->getParameter($match[1]);
                if (!is_scalar($value)) {
                    throw new RuntimeException(sprintf('Parameter "%s" found when resolving env var "%s" must be scalar, "%s" given.', $match[1], $name, get_debug_type($value)));
                }

                return $value;
            }, $env);
        }

        if ('csv' === $prefix) {
            return str_getcsv($env, ',', '"', \PHP_VERSION_ID >= 70400 ? '' : '\\');
        }

        if ('trim' === $prefix) {
            return trim($env);
        }

        throw new RuntimeException(sprintf('Unsupported env var prefix "%s" for env name "%s".', $prefix, $name));
    }
}