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# Copyright 2025 Google LLC

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at apache.org/licenses/LICENSE-2.0.

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""

Google Chat app with a selection input

"""

from typing import Any, Mapping

from flask import Flask, request, json

app = Flask(__name__)

FUNCTION_URL = "your-function-url"

# [START selection_input]

@app.route('/', methods=['POST'])

def post() -> Mapping[str, Any]:

"""Handle requests from Google Chat

Returns:

Mapping[str, Any]: The response

"""

# Stores the Google Chat event

chatEvent = request.get_json().get('chat')

# Handle user interaction with multiselect.

if chatEvent.get('widgetUpdatedPayload') is not None:

return json.jsonify(query_contacts(request.get_json()))

# Replies with a card that contains the multiselect menu.

return json.jsonify({ 'hostAppDataAction': { 'chatDataAction': { 'createMessageAction': {

'message': { 'cardsV2': [{

'cardId': "contactSelector",

'card': { 'sections':[{ 'widgets': [{

# [START selection_input_init]

'selectionInput': {

'name': "contacts",

'type': "MULTI_SELECT",

'label': "Selected contacts",

'multiSelectMaxSelectedItems': 3,

'multiSelectMinQueryLength': 1,

'externalDataSource': { 'function': FUNCTION_URL },

# Suggested items loaded by default.

# The list is static here but it could be dynamic.

'items': [get_suggested_contact("3")]

}

# [END selection_input_init]

}]}]}

}]}

}}}})

def query_contacts(event: dict) -> dict:

"""Get contact suggestions based on text typed by users.

Args:

event (Mapping[str, Any]): The event object that contains the user's query

Returns:

Mapping[str, Any]: The response with contact suggestions.

"""

query = event.get("commonEventObject").get("parameters").get("autocomplete_widget_query")

return { 'action': { 'modifyOperations': [{ 'updateWidget': { 'selectionInputWidgetSuggestions': { 'suggestions': list(

filter(lambda e: query is None or query in e["text"], [

# The list is static here but it could be dynamic.

get_suggested_contact("1"), get_suggested_contact("2"), get_suggested_contact("3"), get_suggested_contact("4"), get_suggested_contact("5")

# Only return items based on the query from the user

])

)}}}]}}

def get_suggested_contact(id: str) -> dict:

"""Generate a suggested contact given an ID.

Args:

id (str): The ID of the contact to return.

Returns:

Mapping[str, Any]: The contact formatted as a selection item in the menu.

"""

return {

'value': id,

'startIconUri': "https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png",

'text': "Contact " + id

}

# [END selection_input]

if __name__ == '__main__':

# This is used when running locally. Gunicorn is used to run the

# application on Google App Engine. See entrypoint in app.yaml.

app.run(host='127.0.0.1', port=8080, debug=True)