telegram_example/src/main/java/org/telegram/Main.java

package org.telegram;

import lombok.extern.slf4j.Slf4j;
import org.telegram.telegrambots.meta.TelegramBotsApi;
import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
import org.telegram.telegrambots.updatesreceivers.DefaultBotSession;
import org.telegram.telegrambots.updatesreceivers.DefaultWebhook;
import org.telegram.updateshandlers.WeatherHandlers;
import org.telegram.updateshandlers.WebHookExampleHandlers;

/**
 * @author Ruben Bermudez
 * @version 1.0
 * @brief Main class to create all bots
 * @date 20 of June of 2015
 */
@Slf4j
public class Main {
    public static void main(String[] args) {
        try {
            TelegramBotsApi telegramBotsApi = createTelegramBotsApi();
            try {
                // Register long polling bots. They work regardless type of TelegramBotsApi we are creating
                // telegramBotsApi.registerBot(new ChannelHandlers());
                // telegramBotsApi.registerBot(new DirectionsHandlers());
                // telegramBotsApi.registerBot(new RaeHandlers());
                telegramBotsApi.registerBot(new WeatherHandlers());
                // telegramBotsApi.registerBot(new TransifexHandlers());
                // telegramBotsApi.registerBot(new FilesHandlers());
                // telegramBotsApi.registerBot(new CommandsHandler(BotConfig.COMMANDS_USER));
            	// telegramBotsApi.registerBot(new ElektrollArtFanHandler());
            } catch (TelegramApiException e) {
                log.error(e.getLocalizedMessage(), e);
            }
        } catch (Exception e) {
            log.error(e.getLocalizedMessage(), e);
        }
    }

    private static TelegramBotsApi createTelegramBotsApi() throws TelegramApiException {
        TelegramBotsApi telegramBotsApi;
        if (!BuildVars.useWebHook) {
            // Default (long polling only)
            telegramBotsApi = createLongPollingTelegramBotsApi();
        } else if (!BuildVars.pathToCertificatePublicKey.isEmpty()) {
            // Filled a path to a pem file ? looks like you're going for the self signed option then, invoke with store and pem file to supply.
            telegramBotsApi = createSelfSignedTelegramBotsApi();
            telegramBotsApi.registerBot(new WebHookExampleHandlers(), null);
        } else {
            // Non self signed, make sure you've added private/public and if needed intermediate to your cert-store.
            telegramBotsApi = createNoSelfSignedTelegramBotsApi();
            telegramBotsApi.registerBot(new WebHookExampleHandlers(), null);
        }
        return telegramBotsApi;
    }

    /**
     * @brief Creates a Telegram Bots Api to use Long Polling (getUpdates) bots.
     * @return TelegramBotsApi to register the bots.
     */
    private static TelegramBotsApi createLongPollingTelegramBotsApi() throws TelegramApiException {
        return new TelegramBotsApi(DefaultBotSession.class);
    }

    /**
     * @brief Creates a Telegram Bots Api to use Long Polling bots and webhooks bots with self-signed certificates.
     * @return TelegramBotsApi to register the bots.
     *
     * @note https://core.telegram.org/bots/self-signed#java-keystore for generating a keypair in store and exporting the pem.
    *  @note Don't forget to split the pem bundle (begin/end), use only the public key as input!
     */
    private static TelegramBotsApi createSelfSignedTelegramBotsApi() throws TelegramApiException {
        return new TelegramBotsApi(DefaultBotSession.class, new DefaultWebhook());
    }

    /**
     * @brief Creates a Telegram Bots Api to use Long Polling bots and webhooks bots with no-self-signed certificates.
     * @return TelegramBotsApi to register the bots.
     *
     * @note Coming from a set of pem files here's one way to do it:
     * @code{.sh}
     * openssl pkcs12 -export -in public.pem -inkey private.pem > keypair.p12
     * keytool -importkeystore -srckeystore keypair.p12 -destkeystore server.jks -srcstoretype pkcs12
     * #have (an) intermediate(s) to supply? first:
     * cat public.pem intermediate.pem > set.pem (use set.pem as -in)
     * @endcode
     */
    private static TelegramBotsApi createNoSelfSignedTelegramBotsApi() throws TelegramApiException {
        return new TelegramBotsApi(DefaultBotSession.class, new DefaultWebhook());
    }
}