old_contents: # Webhooks for external integrations.
  import re
  from typing import Any, Dict
  
  from django.http import HttpRequest, HttpResponse
  
  from zerver.decorator import 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
  
  
  @webhook_view("AppFollow")
  @has_request_variables
  def api_appfollow_webhook(
      request: HttpRequest,
      user_profile: UserProfile,
      payload: Dict[str, Any] = REQ(argument_type="body"),
  ) -> HttpResponse:
      message = payload["text"]
      app_name_search = re.search(r"\A(.+)", message)
      assert app_name_search is not None
      app_name = app_name_search.group(0)
      topic = app_name
  
      check_send_webhook_message(request, user_profile, topic, body=convert_markdown(message))
      return json_success(request)
  
  
  def convert_markdown(text: str) -> str:
      # Converts Slack-style Markdown to Zulip format
      # Implemented mainly for AppFollow messages
      # Not ready for general use as some edge-cases not handled
      # Convert bold
      text = re.sub(r"(?:(?<=\s)|(?<=^))\*(.+?\S)\*(?=\s|$)", r"**\1**", text)
      # Convert italics
      text = re.sub(r"\b_(\s*)(.+?)(\s*)_\b", r"\1*\2*\3", text)
      # Convert strikethrough
      text = re.sub(r"(?:(?<=\s)|(?<=^))~(.+?\S)~(?=\s|$)", r"~~\1~~", text)
  
      return text
  
new_contents: # Webhooks for external integrations.
  import re
  
  from django.http import HttpRequest, HttpResponse
  
  from zerver.decorator import webhook_view
  from zerver.lib.request import REQ, has_request_variables
  from zerver.lib.response import json_success
  from zerver.lib.validator import WildValue, check_string, to_wild_value
  from zerver.lib.webhooks.common import check_send_webhook_message
  from zerver.models import UserProfile
  
  
  @webhook_view("AppFollow")
  @has_request_variables
  def api_appfollow_webhook(
      request: HttpRequest,
      user_profile: UserProfile,
      payload: WildValue = REQ(argument_type="body", converter=to_wild_value),
  ) -> HttpResponse:
      message = payload["text"].tame(check_string)
      app_name_search = re.search(r"\A(.+)", message)
      assert app_name_search is not None
      app_name = app_name_search.group(0)
      topic = app_name
  
      check_send_webhook_message(request, user_profile, topic, body=convert_markdown(message))
      return json_success(request)
  
  
  def convert_markdown(text: str) -> str:
      # Converts Slack-style Markdown to Zulip format
      # Implemented mainly for AppFollow messages
      # Not ready for general use as some edge-cases not handled
      # Convert bold
      text = re.sub(r"(?:(?<=\s)|(?<=^))\*(.+?\S)\*(?=\s|$)", r"**\1**", text)
      # Convert italics
      text = re.sub(r"\b_(\s*)(.+?)(\s*)_\b", r"\1*\2*\3", text)
      # Convert strikethrough
      text = re.sub(r"(?:(?<=\s)|(?<=^))~(.+?\S)~(?=\s|$)", r"~~\1~~", text)
  
      return text
  
subject: Strengthen types using WildValue.