kt-telegram-bot

Convenient way to build Telegram bots using powerful Kotlin language. Support for Telegram Bot API 6.1. Method names are the same as in API.

Changelog

Version 2.1.5

• Update Bot API to 6.1

Version 2.1.4

• Common ChatMember status and user fields
• fixed Owner and Administrator serialization

Version 2.1.3

• fixed ChatId serialization

Changelog history

Getting started

Prerequisites

• JDK 8 or higher
• Kotlin 1.3 or higher
• Gradle
• IDE (optionally)

Installation

Gradle

repositories {
    maven { url "https://jitpack.io" }
}

dependencies {
    implementation "com.elbekD:kt-telegram-bot:$version"
}

Or Gradle Kotlin DSL

repositories {
    maven("https://jitpack.io")
}

dependencies {
    compile("com.elbekD:kt-telegram-bot:${version}")
}

Maven

<repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
</repository>

<dependency>
    <groupId>com.elbekD</groupId>
    <artifactId>kt-telegram-bot</artifactId>
    <version>{version}</version>
</dependency>

Quick start

fun main(args: Array<String>) {
    val token = "<TOKEN>"
    val bot = Bot.createPolling(token)
    bot.onCommand("/start") { msg, _ ->
        bot.sendMessage(msg.chat.id, "Hello World!")
    }
    bot.start()
}

Chain

It is common case when you need to ask the user several questions sequentially and process user errors. Now you can create such chains easily. Sea the example below. Do not forget to call build() method at the end.

fun main() {
    val token = "<TOKEN>"
    val username = "<BOT USERNAME>"
    val bot = Bot.createPolling(username, token)

    bot.chain("/start") { msg -> bot.sendMessage(msg.chat.id.toChatId(), "Hi! What is your name?") }
        .then { msg -> bot.sendMessage(msg.chat.id.toChatId(), "Nice to meet you, ${msg.text}! Send something to me") }
        .then { msg -> bot.sendMessage(msg.chat.id.toChatId(), "Fine! See you soon") }
        .build()

    bot.chain(
        label = "location_chain",
        predicate = { msg -> msg.location != null },
        action = { msg ->
            bot.sendMessage(
                msg.chat.id.toChatId(),
                "Fine, you've sent me a location. Confirm the order?(yes|no)"
            )
        })
        .then("answer_choice") { msg ->
            when (msg.text) {
                "yes" -> bot.jumpToAndFire("order_taxi", msg)
                "no" -> bot.jumpToAndFire("cancel_ordering", msg)
                else -> {
                    bot.sendMessage(msg.chat.id.toChatId(), "Oops, I don't understand you. Just answer yes or no?")
                    bot.jumpTo("answer_choice", msg)
                }
            }
        }
        .then("order_taxi", isTerminal = true) { msg ->
            bot.sendMessage(msg.chat.id.toChatId(), "Fine! Taxi is coming")
        }
        .then("cancel_ordering", isTerminal = true) { msg ->
            bot.sendMessage(msg.chat.id.toChatId(), "Ok! See you next time")
        }
        .build()

    bot.start()
}

Deployment

Use ShadowJar plugin or any other way you like.

Examples

• Long polling bot
• Webhook bot and nginx configuration file

Bot methods

See details in source code.

License

MIT License