text: from django.conf import settings
  from django.http import HttpRequest, HttpResponse
  from django.utils.translation import ugettext as _
  
  from zerver.models import RealmEmoji, UserProfile
  from zerver.lib.emoji import check_emoji_admin, check_valid_emoji_name
  from zerver.lib.request import JsonableError, REQ, has_request_variables
  from zerver.lib.response import json_success, json_error
  from zerver.lib.actions import check_add_realm_emoji, do_remove_realm_emoji
  from zerver.decorator import require_member_or_admin
  
  
  def list_emoji(request: HttpRequest, user_profile: UserProfile) -> HttpResponse:
  
      # We don't call check_emoji_admin here because the list of realm
      # emoji is public.
      return json_success({'emoji': user_profile.realm.get_emoji()})
  
  
  @require_member_or_admin
  @has_request_variables
  def upload_emoji(request: HttpRequest, user_profile: UserProfile,
                   emoji_name: str=REQ()) -> HttpResponse:
      emoji_name = emoji_name.strip().replace(' ', '_')
      check_valid_emoji_name(emoji_name)
      check_emoji_admin(user_profile)
      if RealmEmoji.objects.filter(realm=user_profile.realm,
                                   name=emoji_name,
                                   deactivated=False).exists():
          return json_error(_("A custom emoji with this name already exists."))
      if len(request.FILES) != 1:
          return json_error(_("You must upload exactly one file."))
      emoji_file = list(request.FILES.values())[0]
      if (settings.MAX_EMOJI_FILE_SIZE * 1024 * 1024) < emoji_file.size:
          return json_error(_("Uploaded file is larger than the allowed limit of %s MB") % (
              settings.MAX_EMOJI_FILE_SIZE))
  
      realm_emoji = check_add_realm_emoji(user_profile.realm,
                                          emoji_name,
                                          user_profile,
                                          emoji_file)
      if realm_emoji is None:
          return json_error(_("Image file upload failed."))
      return json_success()
  
  
  def delete_emoji(request: HttpRequest, user_profile: UserProfile,
                   emoji_name: str) -> HttpResponse:
      if not RealmEmoji.objects.filter(realm=user_profile.realm,
                                       name=emoji_name,
                                       deactivated=False).exists():
          raise JsonableError(_("Emoji '%s' does not exist") % (emoji_name,))
      check_emoji_admin(user_profile, emoji_name)
      do_remove_realm_emoji(user_profile.realm, emoji_name)
      return json_success()
  