JsonRPC PHP Client and Server

A simple Json-RPC client/server that just works. Forked from fguillot/JsonRPC while trying to keep it slim and speedy.

Features

• JSON-RPC 2.0 protocol only
• The server support batch requests and notifications
• Authentication and IP based client restrictions
• Minimalist: there is only 2 files
• Fully unit tested
• Requirements: PHP >= 5.6
• License: MIT

Author

Frédéric Guillot

Installation with Composer

composer require rambler-digital-solutions/php-json-rpc @stable

Examples

Server

Callback binding:

<?php

use JsonRPC\Server;

$server = new Server;

// Procedures registration
$server->register('addition', function ($a, $b) {
    return $a + $b;
});

$server->register('random', function ($start, $end) {
    return mt_rand($start, $end);
});

// Return the response to the client
echo $server->execute();

Class/Method binding:

<?php

use JsonRPC\Server;

class Api
{
    public function doSomething($arg1, $arg2 = 3)
    {
        return $arg1 + $arg2;
    }
}

$server = new Server;

// Bind the method Api::doSomething() to the procedure myProcedure
$server->bind('myProcedure', 'Api', 'doSomething');

// Use a class instance instead of the class name
$server->bind('mySecondProcedure', new Api, 'doSomething');

// The procedure and the method are the same
$server->bind('doSomething', 'Api');

// Attach the class, client will be able to call directly Api::doSomething()
$server->attach(new Api);

echo $server->execute();

Before callback:

Before each procedure execution, a custom method can be called.

This method receive the following arguments: $username, $password, $class, $method.

<?php

use JsonRPC\Server;
use JsonRPC\AuthenticationFailure;

class Api
{
    public function beforeProcedure($username, $password, $class, $method)
    {
        if ($login_condition_failed) {
            throw new AuthenticationFailure('Wrong credentials!');
        }
    }

    public function addition($a, $b)
    {
        return $a + $b;
    }
}

$server = new Server;
$server->authentication(['myuser' => 'mypassword']);

// Register the before callback
$server->before('beforeProcedure');

$server->attach(new Api);

echo $server->execute();

You can use this method to implements a custom authentication system or anything else. If you would like to reject the authentication, you can throw the exception JsonRPC\AuthenticationFailure.

Client

Example with positional parameters:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');
$result = $client->execute('addition', [3, 5]);

var_dump($result);

Example with named arguments:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');
$result = $client->execute('random', ['end' => 10, 'start' => 1]);

var_dump($result);

Arguments are called in the right order.

Examples with shortcut methods:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');
$result = $client->random(50, 100);

var_dump($result);

The example above use positional arguments for the request and this one use named arguments:

$result = $client->random(['end' => 10, 'start' => 1]);

Client batch requests

Call several procedures in a single HTTP request:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');

$results = $client->batch()
                  ->foo(['arg1' => 'bar'])
                  ->random(1, 100)
                  ->add(4, 3)
                  ->execute('add', [2, 5])
                  ->send();

print_r($results);

All results are stored at the same position of the call.

Client exceptions

Client exceptions are normally thrown when an error is returned by the server. You can change this behaviour by using the 'suppress_errors' option which causes exceptions to be returned. This can be extremely useful when executing the batch request.

• BadFunctionCallException: Procedure not found on the server
• InvalidArgumentException: Wrong procedure arguments
• JsonRPC\AccessDeniedException: Access denied
• JsonRPC\ConnectionFailureException: Connection failure
• JsonRPC\ServerErrorException: Internal server error
• RuntimeException: Protocol error

Enable client debugging

You can enable the debug to see the JSON request and response:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');
$client->debug = true;

The debug output is sent to the PHP's system logger. You can configure the log destination in your php.ini.

Output example:

==> Request:
{
    "jsonrpc": "2.0",
    "method": "removeCategory",
    "id": 486782327,
    "params": [
        1
    ]
}
==> Response:
{
    "jsonrpc": "2.0",
    "id": 486782327,
    "result": true
}

IP based client restrictions

The server can allow only some IP adresses:

<?php

use JsonRPC\Server;

$server = new Server;

// IP client restrictions
$server->allowHosts(['192.168.0.1', '127.0.0.1']);

// Procedures registration

[...]

// Return the response to the client
echo $server->execute();

If the client is blocked, you got a 403 Forbidden HTTP response.

HTTP Basic Authentication

If you use HTTPS, you can allow client by using a username/password.

<?php

use JsonRPC\Server;

$server = new Server;

// List of users to allow
$server->authentication(['user1' => 'password1', 'user2' => 'password2']);

// Procedures registration

[...]

// Return the response to the client
echo $server->execute();

On the client, set credentials like that:

<?php

use JsonRPC\Client;

$client = new Client('http://localhost/server.php');
$client->authentication('user1', 'password1');

If the authentication failed, the client throw a RuntimeException.

Using an alternative authentication header:

use JsonRPC\Server;

$server = new Server;
$server->setAuthenticationHeader('X-Authentication');
$server->authentication(['myusername' => 'mypassword']);

The example above will use the HTTP header X-Authentication instead of the standard Authorization: Basic [BASE64_CREDENTIALS]. The username/password values need be encoded in base64: base64_encode('username:password').

Exceptions

If you want to send an error to the client you can throw an exception. You should configure which exceptions should be relayed to the client first:

<?php

use JsonRPC\Server;
class MyException extends RuntimeException {};

$server = new Server;

// Exceptions that should be relayed to the client, if they occur
$server->attachException('MyException');

// Procedures registration

[...]

// Return the response to the client
echo $server->execute();

Then you can throw that exception inside your procedure:

throw new MyException("An error occured", 123);

To relay all exceptions regardless of type, leave out the exception class name:

$server->attachException();