iltar/http-bundle

Adding extra functionality to Symfony

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Type:symfony-bundle

v1.1.4 2017-11-18 13:50 UTC

README

Provides extra HTTP related functionality in Symfony.

Requirements:

  • PHP 5.5 or higher, including php 7
  • Symfony 2.7 or higher

Recommended installation is via composer: composer require iltar/http-bundle.

Router Enhancements

    /**
     * @Route("/profile/{user}/", name="app.view-profile")
     */
    public function viewProfileAction(AppUser $user);

Let's say we have a ParamConverter on this route that would nicely convert the user parameter of your route to an AppUser, but how would you generate the route for this action? Sadly you still need a scalar as parameter for Router::generate():

$router->generate('app.view-profile', ['user' => $user->getId()]);

Okay, not really a big problem, but we're passing an id to a parameter which you would expect to have an AppUser if you look at the action. Another problem is that if you want to change the argument passed along, you will have to update every single usage of this URL. A decent IDE can get around this issue, but wait! What about your twig templates?

{{ path('app.view-profile', { 'user': user.id }) }}
{{ path('app.view-profile', { 'user': user.getid }) }}
{{ path('app.view-profile', { 'user': user.getId() }) }}
{{ path('app.view-profile', { 'user': user[id] }) }}

{# I think you see where I'm going at #}

How nice would it be if you could just pass your user object along?

$router->generate('app.view-profile', ['user' => $user]);

The router decorator is provided to make it easier to resolve arguments required for route generation. They work like a reversed ParamConverter.

A quick Example

You need to do two things to make this work:

  • create a resolver
  • write a service definition for it and tag it accordingly
<?php
namespace App\Router;

use App\AppUser;
use Iltar\HttpBundle\Router\ParameterResolverInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

final class UserParameterResolver implements ParameterResolverInterface
{
    public function supportsParameter($name, $value)
    {
        return 'user' === $name && $value instanceof AppUser
    }

    /**
     * Resolves AppUser for 'user' to AppUser::getUsername().
     *
     * {@inheritdoc}
     */
    public function resolveParameter($name, $value)
    {
        return $value->getUsername();
    }
}

And don't forget the service definition.

services:
    app.router.user-param-resolver:
        class: App\AppUser\UserParameterResolver
        tags:
            - { name: router.parameter_resolver, priority: 150 }

That's too much work!

This is very nice, but a lot of work. Do I really have to write a resolver for each parameter I want to have resolved? The answer is simple: no. This package comes with two resolvers already.

The first resolver is the IdentifyingValueResolver. This resolver functions as a delegator for models implementing the ModelDescriptorInterface. This resolver will attempt to find the identifying value and obtain it. Currently this package ships with the following descriptors:

  • EntityIdDescriptor - Attempts to get the value marked with @Id from a doctrine entity.

The second resolver provided is the MappablePropertyPathResolver. It does two things:

  • Automagically tries to resolve the property required (more on this later), using Symfony's Property Accessor component.
  • Allows you to override or wildcard certain objects via configuration.

The IdentifyingValueResolver with the EntityIdDescriptor is registered with a priority of 100 by default. The MappablePropertyPathResolver is registered with a priority of 200.

So how can I make it resolve my properties?

It follows three checks:

  • Is the object provided mapped in the configuration?
  • Is the name of the argument mapped in the configuration?
  • Is the name of the argument an accessible property in the object?
// let's take this simple example
$router->generate('app.view-user', ['username' => $user]);
$router->generate('app.view-user', ['id' => $user]);

Without any configuration, the first would attempt to call $user->getUsername() and the second $user->getId().

// let's take another example
$router->generate('app.view-user', ['user' => $user]);
Aliasing a property

This serves a bit more problematic, as there is no user property within the AppUser. You can work around this issue by defining the mapping in the configuration. This configuration example would call $user->getUsername() if the key user and the object an AppUser.

iltar_http:
    router:
        mapped_properties:
            App\AppUser.user: username
Wildcards

But my application is a bit messy and I have several different ways of getting the id from a user: user_id, user, id and uid, how do I solve this without writing a lot of configuration? Solution: use the wildcard declaration. The wildcard declaration will make sure that if the AppUser is being passed along, it will always get the id.

iltar_http:
    router:
        mapped_properties:
            App\AppUser: id

But this makes it problematic when I still want to be able to get the username on some pages but the id on the rest, how do I solve this? There's a solution for that as well! Next to a wildcard, you can also specify the username. If a more specific field is configured, it will take that over the wildcard if the name of the parameter matches.

iltar_http:
    router:
        mapped_properties:
            App\AppUser          : id
            App\AppUser.user     : username
            App\AppUser.username : ~

The first line tells that all undefined keys match the id. The second line tells that if they key is user, it should get the username. The third line means that it should pick the parameter name as property name.

Power of the Property Accessor Component

I'm lazy though, what if I want link to the first address of my Client, which has a one to many relation?

iltar_http:
    router:
        mapped_properties:
            App\Client.first_address: address[0]
Using the IdentifyingValueResolver Alongside the MappablePropertyPathResolver

If you enable the IdentifyingValueResolver, you can already cover the cases where your parameter is the id. When enabled you can can remove the definitions of the mapped_properties where you would refer to the primary key (usually id). The identifier is not limited to id or getId(), the resolver will dynamically attempt to find which field is the primary key. If the id happens to be another entity, it will try to get the id of that given entity until it finds a scalar. It does not support composite primary keys.

To enable the id resolver you have to enable the configuration:

iltar_http:
    router:
        entity_id_resolver: true