Создайте HTTP-приложение Google Chat.

import { http } from '@google-cloud/functions-framework';

// The ID of the slash command "/about".
// You must use the same ID in the Google Chat API configuration.
const ABOUT_COMMAND_ID = 1;

/**
 * Handle requests from Google Workspace add on
 *
 * @param {Object} req Request sent by Google Chat
 * @param {Object} res Response to be sent back to Google Chat
 */
http('avatarApp', (req, res) => {
  const chatEvent = req.body.chat;
  let message;
  if (chatEvent.appCommandPayload) {
    message = handleAppCommand(chatEvent);
  } else {
    message = handleMessage(chatEvent);
  }
  res.send({ hostAppDataAction: { chatDataAction: { createMessageAction: {
    message: message
  }}}});
});

/**
 * Responds to an APP_COMMAND event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 * @return the response message object.
 */
function handleAppCommand(event) {
  switch (event.appCommandPayload.appCommandMetadata.appCommandId) {
    case ABOUT_COMMAND_ID:
      return {
        text: 'The Avatar app replies to Google Chat messages.'
      };
  }
}

/**
 * Responds to a MESSAGE event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 * @return the response message object.
 */
function handleMessage(event) {
  // Stores the Google Chat user as a variable.
  const chatUser = event.messagePayload.message.sender;
  const displayName = chatUser.displayName;
  const avatarUrl = chatUser.avatarUrl;
  return {
    text: 'Here\'s your avatar',
    cardsV2: [{
      cardId: 'avatarCard',
      card: {
        name: 'Avatar Card',
        header: {
          title: `Hello ${displayName}!`,
        },
        sections: [{ widgets: [{
          textParagraph: { text: 'Your avatar picture: ' }
        }, {
          image: { imageUrl: avatarUrl }
        }]}]
      }
    }]
  };
}

from typing import Any, Mapping

import flask
import functions_framework

# The ID of the slash command "/about".
# You must use the same ID in the Google Chat API configuration.
ABOUT_COMMAND_ID = 1

@functions_framework.http
def avatar_app(req: flask.Request) -> Mapping[str, Any]:
  """Handle requests from Google Workspace add on

  Args:
    flask.Request req: the request sent by Google Chat

  Returns:
    Mapping[str, Any]: the response to be sent back to Google Chat
  """
  chat_event = req.get_json(silent=True)["chat"]
  if chat_event and "appCommandPayload" in chat_event:
    message = handle_app_command(chat_event)
  else:
    message = handle_message(chat_event)
  return { "hostAppDataAction": { "chatDataAction": { "createMessageAction": {
      "message": message
  }}}}

def handle_app_command(event: Mapping[str, Any]) -> Mapping[str, Any]:
  """Responds to an APP_COMMAND event in Google Chat.

  Args:
    Mapping[str, Any] event: the event object from Google Chat

  Returns:
    Mapping[str, Any]: the response message object.
  """
  if event["appCommandPayload"]["appCommandMetadata"]["appCommandId"] == ABOUT_COMMAND_ID:
    return {
      "text": "The Avatar app replies to Google Chat messages.",
    }
  return {}

def handle_message(event: Mapping[str, Any]) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat.

  Args:
    Mapping[str, Any] event: the event object from Google Chat

  Returns:
    Mapping[str, Any]: the response message object.
  """
  # Stores the Google Chat user as a variable.
  chat_user = event["messagePayload"]["message"]["sender"]
  display_name = chat_user.get("displayName", "")
  avatar_url = chat_user.get("avatarUrl", "")
  return {
    "text": "Here's your avatar",
    "cardsV2": [{
      "cardId": "avatarCard",
      "card": {
        "name": "Avatar Card",
        "header": {
          "title": f"Hello {display_name}!"
        },
        "sections": [{ "widgets": [
          { "textParagraph": { "text": "Your avatar picture:" }},
          { "image": { "imageUrl": avatar_url }},
        ]}]
      }
    }]
  }

package com.google.chat.avatar;

import com.google.api.services.chat.v1.model.CardWithId;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1Card;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1CardHeader;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1Image;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1Section;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1TextParagraph;
import com.google.api.services.chat.v1.model.GoogleAppsCardV1Widget;
import com.google.api.services.chat.v1.model.Message;
import com.google.cloud.functions.HttpFunction;
import com.google.cloud.functions.HttpRequest;
import com.google.cloud.functions.HttpResponse;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import java.util.List;

public class App implements HttpFunction {
  // The ID of the slash command "/about".
  // You must use the same ID in the Google Chat API configuration.
  private static final int ABOUT_COMMAND_ID = 1;

  private static final Gson gson = new Gson();

  /**
   * Handle requests from Google Workspace add on
   * 
   * @param request the request sent by Google Chat
   * @param response the response to be sent back to Google Chat
   */
  @Override
  public void service(HttpRequest request, HttpResponse response) throws Exception {
    JsonObject event = gson.fromJson(request.getReader(), JsonObject.class);
    JsonObject chatEvent = event.getAsJsonObject("chat");
    Message message;
    if (chatEvent.has("appCommandPayload")) {
      message = handleAppCommand(chatEvent);
    } else {
      message = handleMessage(chatEvent);
    }
    JsonObject createMessageAction = new JsonObject();
    createMessageAction.add("message", gson.fromJson(gson.toJson(message), JsonObject.class));
    JsonObject chatDataAction = new JsonObject();
    chatDataAction.add("createMessageAction", createMessageAction);
    JsonObject hostAppDataAction = new JsonObject();
    hostAppDataAction.add("chatDataAction", chatDataAction);
    JsonObject dataActions = new JsonObject();
    dataActions.add("hostAppDataAction", hostAppDataAction);
    response.getWriter().write(gson.toJson(dataActions));
  }

  /**
   * Handles an APP_COMMAND event in Google Chat.
   *
   * @param event the event object from Google Chat
   * @return the response message object.
   */
  private Message handleAppCommand(JsonObject event) throws Exception {
    switch (event.getAsJsonObject("appCommandPayload")
      .getAsJsonObject("appCommandMetadata").get("appCommandId").getAsInt()) {
      case ABOUT_COMMAND_ID:
        return new Message()
          .setText("The Avatar app replies to Google Chat messages.");
      default:
        return null;
    }
  }

  /**
   * Handles a MESSAGE event in Google Chat.
   *
   * @param event the event object from Google Chat
   * @return the response message object.
   */
  private Message handleMessage(JsonObject event) throws Exception {
    // Stores the Google Chat user as a variable.
    JsonObject chatUser = event.getAsJsonObject("messagePayload").getAsJsonObject("message").getAsJsonObject("sender");
    String displayName = chatUser.has("displayName") ? chatUser.get("displayName").getAsString() : "";
    String avatarUrl = chatUser.has("avatarUrl") ? chatUser.get("avatarUrl").getAsString() : "";
    return new Message()
      .setText("Here's your avatar")
      .setCardsV2(List.of(new CardWithId()
        .setCardId("avatarCard")
        .setCard(new GoogleAppsCardV1Card()
          .setName("Avatar Card")
          .setHeader(new GoogleAppsCardV1CardHeader()
            .setTitle(String.format("Hello %s!", displayName)))
          .setSections(List.of(new GoogleAppsCardV1Section().setWidgets(List.of(
            new GoogleAppsCardV1Widget().setTextParagraph(new GoogleAppsCardV1TextParagraph()
              .setText("Your avatar picture:")),
            new GoogleAppsCardV1Widget()
              .setImage(new GoogleAppsCardV1Image().setImageUrl(avatarUrl)))))))));
  }
}

<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.google.chat</groupId>
  <artifactId>avatar-app</artifactId>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <maven.compiler.target>17</maven.compiler.target>
    <maven.compiler.source>17</maven.compiler.source>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.google.cloud.functions</groupId>
      <artifactId>functions-framework-api</artifactId>
      <version>1.1.4</version>
    </dependency>
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.9.1</version>
    </dependency>
    <dependency>
      <groupId>com.google.apis</groupId>
      <artifactId>google-api-services-chat</artifactId>
      <version>v1-rev20230115-2.0.0</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
        <excludes>
          <exclude>.google/</exclude>
        </excludes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>