Viber Java Bot API

Use this library to develop a bot for Viber platform. The library is available on GitHub as well as maven central.

License

This library is released under the terms of the Apache 2.0 license. See License for more information.

Library Prerequisites

• Java >= 8
• Get your Viber Public Account authentication token. Your token is generated and provided to you during the Public Account creation process. As a Public Account admin, you can always find the account token in the "edit info" page.
• SSL Certification - You'll need a trusted (ca.pem) certificate, not self-signed. You can find one at Let's Encrypt or buy one.

Installation

This library is released on maven central.

Gradle

compile group: 'com.viber', name: 'viber-bot', version: '1.0.11'

Maven

<dependency>
    <groupId>com.viber</groupId>
    <artifactId>viber-bot</artifactId>
    <version>1.0.11</version>
</dependency>

Documentation

JavaDocs

All public APIs are documented with JavaDocs which can be found in the GitHub repository.

Sample projects

We've created two sample projects to help you get started:

• Spring-Boot Sample using spring-boot-starter-web package.
• NanoHTTPd Sample with a tiny embedded HTTP server, called NanoHTTPd.

A simple overview

public void botExample() {
    ViberBot bot = new ViberBot(new BotProfile("SampleBot", "http://viber.com/avatar.jpg"), "YOUR_AUTH_TOKEN_HERE");
    bot.onMessageReceived((event, message, response) -> response.send(message));

    // somewhere else in your web server of choice:
    bot.incoming(Request.fromJsonString("..."));
}

You can chose to use any web server or framework you like. All you need to do is call the API with -

bot.incoming(Request.fromJsonString("...")); // or
bot.incoming(Request.fromInputStream(inputStream));

Should I be concerned with synchronizing my web server threads? Is this library thread-safe?

The Viber bot library is thread-safe and highly concurrent. You do not have to worry about synchronizing anything.

All calls to ViberBot#incoming() go through a BlockingQueue, and ordering is retained. All I/O calls are directly executed on the same thread they were initially called on.

Can I make I/O calls asynchronous and still retain thread-safety for my bot?

Yes. You can pass a system property to control the I/O thread pool:

com.viber.bot.executor.strategy=[DIRECT|THREAD] (default is DIRECT)

com.viber.bot.executor.threads=N (default is getRuntime().availableProcessors())

• Note: This will not change the way you use the library. You still don't have to synchronize anything.

Do you supply a basic router for text messages?

Well funny you ask. Yes we do. But a word of warning - messages sent to your router callback will also be emitted to the ViberBot#onMessageReceived event.

public void botTextRouterExample() {
    bot.onTextMessage("(hi|hello)", (event, message, response) -> response.send("Hi " + event.getSender().getName()));
}

Community

Join the conversation on Gitter.