Request Mapper

Symfony attributes for mapping HTTP request headers, path parameters and uploaded files to object constructor parameters via the Serializer denormalization pipeline.

Requirements

• PHP >= 8.2 (tested on 8.2, 8.3, 8.4, 8.5)
• Symfony 6.4, 7.x or 8.x

Installation

composer require devouted/request-mapper

Usage

Mark constructor parameters with attributes to indicate their source:

use RequestMapper\Attribute\FromHeader;
use RequestMapper\Attribute\FromPath;
use RequestMapper\Attribute\FromUploads;

class GetArticleQuery
{
    public function __construct(
        #[FromPath]
        public int $articleId,

        #[FromHeader(name: 'Accept-Language')]
        public string $language,
    ) {
    }
}

class UploadFileCommand
{
    public function __construct(
        #[FromPath]
        public int $visitId,

        #[FromUploads]
        public array $files = [],
    ) {
    }
}

Attributes

All attributes accept optional name (defaults to parameter name) and required (defaults to true).

#[FromPath] automatically casts values to the parameter's PHP type (int, float, bool, string).

Value Resolver

The bundle includes RequestMapperValueResolver which integrates with Symfony's #[MapQueryString] and #[MapRequestPayload] attributes. This solves the problem where Symfony's default resolver skips mapping entirely when the query string or request body is empty — preventing FromHeader, FromPath and FromUploads attributes from being processed.

use RequestMapper\Attribute\FromHeader;
use RequestMapper\Attribute\FromPath;
use Symfony\Component\HttpKernel\Attribute\MapQueryString;

class ArticleController
{
    public function show(#[MapQueryString] GetArticleQuery $query): Response
    {
        // Works even when the query string is empty —
        // FromPath and FromHeader attributes are still resolved.
    }
}

The resolver requires symfony/http-kernel and symfony/validator.

Configuration

If Symfony autoconfiguration is enabled, the denormalizer and value resolver are registered automatically. Otherwise register them manually:

# config/services.yaml
services:
    RequestMapper\Serializer\RequestMapperDenormalizer:
        tags: ['serializer.normalizer']

    RequestMapper\ArgumentResolver\RequestMapperValueResolver:
        tags: ['controller.argument_value_resolver']