text: 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 UnexpectedWebhookEventType, \
      check_send_webhook_message, get_http_headers_from_filename, \
      validate_extract_webhook_http_header
  from zerver.models import UserProfile
  
  EVENTS = ['deploy_failed', 'deploy_locked', 'deploy_unlocked', 'deploy_building', 'deploy_created']
  
  fixture_to_headers = get_http_headers_from_filename("HTTP_X_NETLIFY_EVENT")
  
  @api_key_only_webhook_view('Netlify')
  @has_request_variables
  def api_netlify_webhook(
          request: HttpRequest, user_profile: UserProfile,
          payload: Dict[str, Iterable[Dict[str, Any]]]=REQ(argument_type='body')
  ) -> HttpResponse:
  
      message_template = get_template(request, payload)
  
      body = message_template.format(build_name=payload['name'],
                                     build_url=payload['url'],
                                     branch_name=payload['branch'],
                                     state=payload['state'])
  
      topic = "{topic}".format(topic=payload['branch'])
  
      check_send_webhook_message(request, user_profile, topic, body)
  
      return json_success()
  
  def get_template(request: HttpRequest, payload: Dict[str, Any]) -> str:
  
      message_template = 'The build [{build_name}]({build_url}) on branch {branch_name} '
      event = validate_extract_webhook_http_header(request, 'X_NETLIFY_EVENT', 'Netlify')
  
      if event == 'deploy_failed':
          return message_template + payload['error_message']
      elif event == 'deploy_locked':
          return message_template + 'is now locked.'
      elif event == 'deploy_unlocked':
          return message_template + 'is now unlocked.'
      elif event in EVENTS:
          return message_template + 'is now {state}.'.format(state=payload['state'])
      else:
          raise UnexpectedWebhookEventType('Netlify', event)
  