JSON Transformer

[ Build Status ] (https://travis-ci.org/nilportugues/php-json) [] (https://coveralls.io/github/nilportugues/json-transformer?branch=master) [ Scrutinizer Code Quality ] (https://scrutinizer-ci.com/g/nilportugues/json-transformer/?branch=master) [ SensioLabsInsight ] (https://insight.sensiolabs.com/projects/76f021fa-6559-4faf-a010-5dfb95cd70e2) [ Latest Stable Version ] (https://packagist.org/packages/nilportugues/json) [ Total Downloads ] (https://packagist.org/packages/nilportugues/json) [ License ] (https://packagist.org/packages/nilportugues/json) , _(*1)

Installation

Use Composer to install the package:, _(*2)

$ composer require nilportugues/json

Usage

Given a PHP Object, and a series of mappings, the JSON Transformer will represent the given data as a JSON object., _(*3)

For instance, given the following piece of code, defining a Blog Post and some comments:, _(*4)

$post = new Post(
  new PostId(9),
  'Hello World',
  'Your first post',
  new User(
      new UserId(1),
      'Post Author'
  ),
  [
      new Comment(
          new CommentId(1000),
          'Have no fear, sers, your king is safe.',
          new User(new UserId(2), 'Barristan Selmy'),
          [
              'created_at' => (new DateTime('2015/07/18 12:13:00'))->format('c'),
              'accepted_at' => (new DateTime('2015/07/19 00:00:00'))->format('c'),
          ]
      ),
  ]
);

And a Mapping array for all the involved classes:, _(*5)

use NilPortugues\Api\Mapping\Mapper;

$mappings = [
    [
        'class' => Post::class,
        'alias' => 'Message',
        'aliased_properties' => [
            'author' => 'author',
            'title' => 'headline',
            'content' => 'body',
        ],
        'hide_properties' => [

        ],
        'id_properties' => [
            'postId',
        ],
        'urls' => [
            'self' => 'http://example.com/posts/{postId}',
            'comments' => 'http://example.com/posts/{postId}/comments'
        ],
    ],
    [
        'class' => PostId::class,
        'alias' => '',
        'aliased_properties' => [],
        'hide_properties' => [],
        'id_properties' => [
            'postId',
        ],
        'urls' => [
            'self' => 'http://example.com/posts/{postId}',
        ],
    ],
    [
        'class' => User::class,
        'alias' => '',
        'aliased_properties' => [],
        'hide_properties' => [],
        'id_properties' => [
            'userId',
        ],
        'urls' => [
            'self' => 'http://example.com/users/{userId}',
            'friends' => 'http://example.com/users/{userId}/friends',
            'comments' => 'http://example.com/users/{userId}/comments',
        ],
    ],
    [
        'class' => UserId::class,
        'alias' => '',
        'aliased_properties' => [],
        'hide_properties' => [],
        'id_properties' => [
            'userId',
        ],
        'urls' => [
            'self' => 'http://example.com/users/{userId}',
            'friends' => 'http://example.com/users/{userId}/friends',
            'comments' => 'http://example.com/users/{userId}/comments',
        ],
    ],
    [
        'class' => Comment::class,
        'alias' => '',
        'aliased_properties' => [],
        'hide_properties' => [],
        'id_properties' => [
            'commentId',
        ],
        'urls' => [
            'self' => 'http://example.com/comments/{commentId}',
        ],
    ],
    [
        'class' => CommentId::class,
        'alias' => '',
        'aliased_properties' => [],
        'hide_properties' => [],
        'id_properties' => [
            'commentId',
        ],
        'urls' => [
            'self' => 'http://example.com/comments/{commentId}',
        ],
    ],
];

$mapper = new Mapper($mappings);

Calling the transformer will output a valid JSON response using the correct formatting:, _(*6)

use NilPortugues\Api\Json\JsonSerializer;
use NilPortugues\Api\Json\Http\Message\Response;

$serializer = new JsonSerializer($mapper);
$output = $serializer->serialize($post);

//PSR7 Response with headers and content.
$response = new Response($output);

header(
    sprintf(
        'HTTP/%s %s %s',
        $response->getProtocolVersion(),
        $response->getStatusCode(),
        $response->getReasonPhrase()
    )
);
foreach($response->getHeaders() as $header => $values) {
    header(sprintf("%s:%s\n", $header, implode(', ', $values)));
}

echo $response->getBody();

Output:, _(*7)

HTTP/1.1 200 OK
Cache-Control: private, max-age=0, must-revalidate
Content-type: application/json; charset=utf-8

{
  "post_id": 9,
  "headline": "Hello World",
  "body": "Your first post",
  "author": {
    "user_id": 1,
    "name": "Post Author"
  },
  "comments": [
    {
      "comment_id": 1000,
      "dates": {
        "created_at": "2015-07-18T12:13:00+02:00",
        "accepted_at": "2015-07-19T00:00:00+02:00"
      },
      "comment": "Have no fear, sers, your king is safe.",
      "user": {
        "user_id": 2,
        "name": "Barristan Selmy"
      }
    }
  ],
  "links": {
    "self": {
      "href": "http://example.com/posts/9"
    },
    "comments": {
      "href": "http://example.com/posts/9/comments"
    }
  }
}