Implement Webhook without server

telegrambots/src/main/java/org/telegram/telegrambots/updatesreceivers/ServerlessWebhook.java

@@ -0,0 +1,55 @@
+package org.telegram.telegrambots.updatesreceivers;
+
+import lombok.extern.slf4j.Slf4j;
+import org.telegram.telegrambots.meta.api.methods.BotApiMethod;
+import org.telegram.telegrambots.meta.api.objects.Update;
+import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
+import org.telegram.telegrambots.meta.exceptions.TelegramApiValidationException;
+import org.telegram.telegrambots.meta.generics.Webhook;
+import org.telegram.telegrambots.meta.generics.WebhookBot;
+
+import java.util.NoSuchElementException;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Slf4j
+public class ServerlessWebhook implements Webhook {
+
+    private final ConcurrentHashMap<String, WebhookBot> callbacks = new ConcurrentHashMap<>();
+
+    public BotApiMethod<?> updateReceived(String botPath, Update update) throws TelegramApiValidationException {
+        if (callbacks.containsKey(botPath)) {
+            try {
+                BotApiMethod<?> response = callbacks.get(botPath).onWebhookUpdateReceived(update);
+                if (response != null) {
+                    response.validate();
+                }
+                return response;
+            } catch (TelegramApiValidationException e) {
+                log.error(e.getLocalizedMessage(), e);
+                throw e;
+            }
+        } else {
+            throw new NoSuchElementException(String.format("Callback '%s' not exist", botPath));
+        }
+    }
+
+    @Override
+    public void startServer() throws TelegramApiException {
+        // Do nothing, because there is no abstraction for webhook without server
+    }
+
+    @Override
+    public void registerWebhook(WebhookBot callback) {
+        callbacks.putIfAbsent(callback.getBotPath(), callback);
+    }
+
+    @Override
+    public void setInternalUrl(String internalUrl) {
+        throw new UnsupportedOperationException("Not implemented for Serverless Webhook");
+    }
+
+    @Override
+    public void setKeyStore(String keyStore, String keyStorePassword) throws TelegramApiException {
+        throw new UnsupportedOperationException("Not implemented for Serverless Webhook");
+    }
+}