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package com.viber.bot.api;
import com.google.common.collect.Lists;
import com.google.common.util.concurrent.ListenableFuture;
import com.viber.bot.Request;
import com.viber.bot.event.BotEventListener;
import com.viber.bot.event.Event;
import com.viber.bot.event.EventEmitter;
import com.viber.bot.event.callback.*;
import com.viber.bot.message.Message;
import com.viber.bot.message.TextMessage;
import com.viber.bot.middleware.DefaultMiddleware;
import com.viber.bot.middleware.Middleware;
import com.viber.bot.profile.BotProfile;
import com.viber.bot.profile.UserProfile;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
import java.io.InputStream;
import java.util.Collection;
import java.util.regex.Pattern;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.viber.bot.Preconditions.checkNotEmpty;
@ThreadSafe
public class ViberBot {
private static final String API_URL = "https://chatapi.viber.com/pa";
private final EventEmitter eventEmitter = new EventEmitter();
private final RegexMatcherRouter regexMatcherRouter = new RegexMatcherRouter();
private final ViberClient client;
private final MessageSender messageSender;
private final Middleware middleware;
private final BotProfile botProfile;
public ViberBot(final @Nonnull BotProfile botProfile, final @Nonnull String authToken) {
checkNotEmpty(authToken, "empty auth token");
this.botProfile = checkNotNull(botProfile);
client = new ViberClient(API_URL, authToken);
messageSender = new MessageSender(getBotProfile(), client);
middleware = new DefaultMiddleware(new RequestReceiverImpl(this, eventEmitter));
setupTextMessageReceivedHandler();
}
/**
* On incoming message from Viber, handles the message asynchronously.
*
* This method returns a {@link ListenableFuture} with {@link InputStream} an promise.
* The returned InputStream should be used as a response to the incoming request from Viber.
* An InputStream is not guaranteed to be returned, and may be null.
* The url argument must specify an absolute {@link Request}. The name
* argument is a specifier that is relative to the url argument.
*
* @param request the Request object
* @return a future with nullable InputStream.
* @see Request
*/
public ListenableFuture incoming(final @Nonnull Request request) {
return middleware.incoming(request);
}
/**
* Sends an set webhook request to Viber
* The url must start with HTTPS, and must have valid ssl certificate.
*
* @param url the url to register as webhook
* @return a future with {@link ApiResponse} that may throw {@link ApiException}.
* @see ApiResponse
* @see ApiException
*/
public ListenableFuture setWebhook(final @Nonnull String url) {
return client.setWebhook(url, Lists.newArrayList(Event.values()));
}
/**
* Sends messages in order to Viber user (via {@link UserProfile}).
*
* This method ensures messages are sent in the order they are received.
* It will discard all keyboard in all messages expect the last message.
*
* @param to {@link UserProfile}
* @param messages collection of {@link Message}
* @return future which contains a collection of message tokens as strings, that may throw {@link ApiException}.
* @see Message
* @see UserProfile
* @see ApiException
*/
public ListenableFuture> sendMessage(final @Nonnull UserProfile to, final @Nonnull Collection messages) {
final ListenableFuture> messageTokens = messageSender.sendMessage(to, messages);
messageTokens.addListener(() -> messages.forEach(message -> eventEmitter.emit(Event.MESSAGE_SENT, to, message)), Runnable::run);
return messageTokens;
}
/**
* Sends one or more messages to a Viber user.
* Shorthand for {@link ViberBot#sendMessage(UserProfile, Collection)}
*
* @param to {@link UserProfile} to send messages to
* @param messages one or more messages to send
* @return future which contains a collection of message tokens as strings, that may throw {@link ApiException}.
* @see ViberBot#sendMessage(UserProfile, Collection)
*/
public ListenableFuture> sendMessage(final @Nonnull UserProfile to, final @Nonnull Message... messages) {
return sendMessage(to, Lists.newArrayList(messages));
}
/**
* Returns the BOT public account info.
*
* @return a future with {@link ApiResponse} that may throw {@link ApiException}.
* @see ApiResponse
* @see ApiException
*/
public ListenableFuture getAccountInfo() {
return client.getAccountInfo();
}
/**
* Returns the BOT profile.
*
* @return {@link BotProfile}
*/
public BotProfile getBotProfile() {
return botProfile;
}
/**
* Returns user details of a specific Viber user.
*
* @param userId a string representing the user id, can be obtained from {@link UserProfile#getId}
* @return a future with {@link ApiResponse} that may throw {@link ApiException}.
* @see ApiResponse
* @see ApiException
*/
public ListenableFuture getUserDetails(final @Nonnull String userId) {
return client.getUserDetails(userId);
}
/**
* Registers a callback for event {@link Event#MESSAGE_RECEIVED}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnMessageReceived} listener
* @see OnMessageReceived
*/
public void onMessageReceived(final @Nonnull OnMessageReceived listener) {
on(Event.MESSAGE_RECEIVED, listener);
}
/**
* Registers a callback for event {@link Event#MESSAGE_SENT}.
* The listener will be called when {@link ViberBot#sendMessage} successfully sends a message.
*
* @param listener an {@link OnMessageSent} listener
* @see OnMessageSent
*/
public void onMessageSent(final @Nonnull OnMessageSent listener) {
on(Event.MESSAGE_SENT, listener);
}
/**
* Registers a callback for a regular expression {@link TextMessage}.
* When a TextMessage arrives, will call listeners with matching pattern sequentially
* Call ordering is not gurenteed.
*
* @param pattern {@link Pattern}
* @param listener an {@link OnMessageReceived} listener
* @see OnMessageReceived
*/
public void onTextMessage(final @Nonnull Pattern pattern, final @Nonnull OnMessageReceived listener) {
regexMatcherRouter.newMatcher(pattern, listener);
}
/**
* Shorthand for {@link ViberBot#onTextMessage(Pattern, OnMessageReceived)}
* Creates a case insensitive {@link Pattern} object.
*
* @param regex regular expression
* @param listener an {@link OnMessageReceived} listener
* @see OnMessageReceived
* @see ViberBot#onTextMessage(Pattern, OnMessageReceived)
*/
public void onTextMessage(final @Nonnull String regex, final @Nonnull OnMessageReceived listener) {
regexMatcherRouter.newMatcher(Pattern.compile(regex, Pattern.CASE_INSENSITIVE), listener);
}
/**
* Registers a callback for event {@link Event#MESSAGE_SEEN}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnMessageSeen} listener
* @see OnMessageSeen
*/
public void onMessageSeen(final @Nonnull OnMessageSeen listener) {
on(Event.MESSAGE_SEEN, listener);
}
/**
* Registers a callback for event {@link Event#MESSAGE_DELIVERED}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnMessageDelivered} listener
* @see OnMessageDelivered
*/
public void onMessageDelivered(final @Nonnull OnMessageDelivered listener) {
on(Event.MESSAGE_DELIVERED, listener);
}
/**
* Registers a callback for event {@link Event#CONVERSATION_STARTED}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnConversationStarted} listener
* @see OnConversationStarted
*/
public void onConversationStarted(final @Nonnull OnConversationStarted listener) {
on(Event.CONVERSATION_STARTED, listener);
}
/**
* Registers a callback for event {@link Event#SUBSCRIBED}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnSubscribe} listener
* @see OnSubscribe
*/
public void onSubscribe(final @Nonnull OnSubscribe listener) {
on(Event.SUBSCRIBED, listener);
}
/**
* Registers a callback for event {@link Event#UNSUBSCRIBED}.
* The listener will be called upon {@link ViberBot#incoming(Request)} of that event.
*
* @param listener an {@link OnUnsubscribe} listener
* @see OnUnsubscribe
*/
public void onUnsubscribe(final @Nonnull OnUnsubscribe listener) {
on(Event.UNSUBSCRIBED, listener);
}
private void on(final @Nonnull Event event, final @Nonnull BotEventListener listener) {
eventEmitter.on(event, listener);
}
private void setupTextMessageReceivedHandler() {
on(Event.MESSAGE_RECEIVED, (OnMessageReceived) (event, message, response) -> {
if (!(message instanceof TextMessage)) return;
final TextMessage textMessage = (TextMessage) event.getMessage();
regexMatcherRouter.tryGetCallback(textMessage.getText()).forEach(callback -> callback.emit(event, message, response));
});
}
}