README

Use this library to develop a bot for the Viber platform or simple work with Viber REST API.

Note: For work with Viber API, you must have an authentication token. Go to partners.viber.com, create bot account and get token.

Installation

composer require alserom/viber-php

For properly work with this package you do also need to install a PSR-17 request/response factory and PSR-18 HTTP Client.
You can find packages of these implementations here:

• List of PSR-17 implementations
• List of PSR-18 implementations

Example:

composer require nyholm/psr7 kriswallsmith/buzz

Usage

This page will just show you the basics. For advanced usage, please read the full documentation.

If you want to quickly try this library on practice, you can use the code from repository viber-bot-examples.

Create objects

// Any PSR-17 implementation. In this case, we use 'nyholm/psr7' package.
$psr17Factory = new \Nyholm\Psr7\Factory\Psr17Factory();

// Any PSR-18 implementation. In this case, we use 'kriswallsmith/buzz' package.
$psr18Client = new \Buzz\Client\Curl($psr17Factory);

/* A simple object for getting all PSR-17 factories.
 * If you have an object which implements all PSR-17 interfaces, you can use a static method. E.g:
 * $psr17 = \Alserom\Viber\Psr17::useForAll($psr17Factory);
 */
$psr17 = new \Alserom\Viber\Psr17(
    $psr17Factory, // \Psr\Http\Message\RequestFactoryInterface
    $psr17Factory, // \Psr\Http\Message\ResponseFactoryInterface
    $psr17Factory, // \Psr\Http\Message\ServerRequestFactoryInterface
    $psr17Factory, // \Psr\Http\Message\StreamFactoryInterface
    $psr17Factory, // \Psr\Http\Message\UploadedFileFactoryInterface
    $psr17Factory  // \Psr\Http\Message\UriFactoryInterface
);

$token = 'YOUR-AUTHENTICATION-TOKEN';

/* An object for work with Viber API.
 * As a fourth argument, you can pass an array of options. See the full documentation for more info.
 */
$api = new \Alserom\Viber\Api($token, $psr17, $psr18Client);

/* An object for creating a logic of Viber bot.
 * As a second argument, you can pass an array of options. See the full documentation for more info.
 */
$bot = new \Alserom\Viber\Bot($api);

Setting a Webhook

$url = 'YOUR-HTTPS-WEBHOOK-URL';
$webhook = new \Alserom\Viber\Entity\Webhook($url);

// If you want that your bot receives user names instead of placeholder values.
// $webhook->setSendName(true);

// If you want that your bot receives user photos instead of placeholder values.
// $webhook->setSendPhoto(true); 

// If you want to filter which events would get a callback for.
// $webhook->setEventTypes(['delivered', 'seen', 'conversation_started']); 

$api->setWebhook($webhook);

Sending message

Build a message from scratch:

$message = new \Alserom\Viber\Message('text');
$message
    ->setText('Hello World!')
    ->setTo(new \Alserom\Viber\Entity\User('USER-IDENTIFIER-HERE'));

// $response is a \Alserom\Viber\Response\Type\SendMessageResponse object.
$response = $api->sendMessage($message);

Or use prepared entity:

$entity = new \Alserom\Viber\Entity\Message\Text();
$entity->setText('Hello World!');

$message = new \Alserom\Viber\Message();
$message->setTo(new \Alserom\Viber\Entity\User('USER-IDENTIFIER-HERE'));
$message->setEntity($entity);

$response = $api->sendMessage($message);

Registering events (Viber callbacks) handlers

$handler = function (\Alserom\Viber\Event\EventInterface $event, \Alserom\Viber\Api $api) {
    // Your logic here
};

$bot->on('message', $handler);

// Or use helper methods
$bot->onMessage($handler);

Handling Viber callbacks

Viber expecting you to return a response with HTTP status code 200 for be sure that callback was delivered. Also, once a conversation_started callback is received you can send a welcome message to the user by returning a response with a prepared message.
This package took care of this. The method \Alserom\Viber\Bot :: handle will return the generated response, which remains simply to emit.

You can use nyholm/psr7-server package or any alternative to create server requests from PHP superglobals.
You can use zendframework/zend-httphandlerrunner package or any alternative to emitting PSR-7 responses.

composer require nyholm/psr7-server zendframework/zend-httphandlerrunner

$serverRequestCreator = new \Nyholm\Psr7Server\ServerRequestCreator(
    $psr17Factory, // \Psr\Http\Message\ServerRequestFactoryInterface
    $psr17Factory, // \Psr\Http\Message\UriFactoryInterface
    $psr17Factory, // \Psr\Http\Message\UploadedFileFactoryInterface
    $psr17Factory  // \Psr\Http\Message\StreamFactoryInterface
);

$serverRequest = $serverRequestCreator->fromGlobals();

// $response is a PSR-7 Response object
$response = $bot->handle($serverRequest);

$emitter = new \Zend\HttpHandlerRunner\Emitter\SapiEmitter();
$emitter->emit($response);

TODO list

• Write documentation
• Create to more tests
• See @TODO tags in the code

Contributing

Pull requests are welcome.

Before you make a PR, be sure that your code is suited to be merged. Just run several scripts:

composer test
composer check-code
composer check-style

License

This project is licensed under the MIT License - see the LICENSE file for details.

See more

• Viber REST API
• Viber Node.JS Bot API
• Viber Python Bot API
• Tools, boilerplates and more from Viber API's open-source contributors.