zulip/zerver/webhooks/helloworld/view.py

# Webhooks for external integrations.
from typing import Any, Dict, Iterable

from django.http import HttpRequest, HttpResponse

from zerver.decorator import api_key_only_webhook_view
from zerver.lib.request import REQ, has_request_variables
from zerver.lib.response import json_success
from zerver.lib.webhooks.common import check_send_webhook_message
from zerver.models import UserProfile


@api_key_only_webhook_view('HelloWorld')
@has_request_variables
def api_helloworld_webhook(
        request: HttpRequest, user_profile: UserProfile,
        payload: Dict[str, Iterable[Dict[str, Any]]]=REQ(argument_type='body')
) -> HttpResponse:

    # construct the body of the message
    body = 'Hello! I am happy to be here! :smile:'

    # try to add the Wikipedia article of the day
    body_template = '\nThe Wikipedia featured article for today is **[{featured_title}]({featured_url})**'
    body += body_template.format(**payload)

    topic = "Hello World"

    # send the message
    check_send_webhook_message(request, user_profile, topic, body)

    return json_success()