Json Patch

Simple library to handle Json Patch requests according to RFC 6902

Other libraries are just changing one JSON string to another but the main purpose of this code is to execute particular action (callback defined in configuration) given particular JSON.

Getting started

Perequisites

• PHP >= 7.0.0

Installing

composer require holokron/json-patch

Example

Configuration

Our example class with methods which should be called:

<?php

namespace Example\Handler;

use Example\Entity\Account;

class UserHandler
{
    public function add($value) 
    {
        $value = json_encode($value);
        echo "UserHandler::add($value)\n";
    }

    public function remove(int $id)
    {
        echo "UserHandler::remove($id)\n";
    }

    public function replace(string $id, array $value)
    {
        $value = json_encode($value);
        echo "UserHandler::replace($id)($value)\n";
    }
}

Configuration of our patcher:

<?php

use Example\Handler\UserHandler;
use Holokron\JsonPatch as JsonPatch;


$accountHandler = new UserHandler();

$builder = new JsonPatch\Definition\Builder();
$definitions = $builder
    ->op('add')
        ->path('/users')
        ->callback([$handler, 'add'])
        ->add()
    ->op('remove')
        ->path('/users/:userId')
        ->callback([$handler, 'remove'])
        ->requirement('userId', '[1-9]+\d*')
        ->add()
    ->op('replace')
        ->path('/users/:userId')
        ->callback([$handler, 'replace'])
        ->requirement('userId', '\w+')
        ->add()
    ->get();

$patcherFactory = new JsonPatch\Factory();
$patcher = $patcherFactory
    ->setMatcher(new JsonPatch\Matcher\Matcher($definitions))
    ->create();

Then applying our example JSON:

[
    {
        "op": "add",
        "path": "/users",
        "value": {
            "name": "super handler"
        }
    },
    {
        "op": "remove",
        "path": "/users/123"
    },
    {
        "op": "replace",
        "path": "/users/456",
        "value": {
            "foo": "bar"
        }
    }
]

We will get result:

UserHandler::add({"name":"super handler"})
UserHandler::remove(123)
UserHandler::replace(456)({"foo":"bar"})