How to use the granary.instagram.Instagram function in granary

def base_object(self, obj):
    """Extends the default base_object() to avoid using shortcodes as object ids.
    """
    base_obj = super(Instagram, self).base_object(obj)

    base_id = base_obj.get('id')
    if base_id and not base_id.replace('_', '').isdigit():
      # this isn't id. it's probably a shortcode.
      del base_obj['id']
      id = obj.get('id')
      if id:
        parsed = util.parse_tag_uri(id)
        if parsed and '_' in parsed[1]:
          base_obj['id'] = parsed[1].split('_')[0]

    return base_obj

def finish(self, auth_entity, state=None):
    if auth_entity:
      user_json = json_loads(auth_entity.user_json)

      # find instagram profile URL
      urls = user_json.get('rel-me', [])
      logging.info('rel-mes: %s', urls)
      for url in util.trim_nulls(urls):
        if util.domain_from_link(url) == gr_instagram.Instagram.DOMAIN:
          username = urllib.parse.urlparse(url).path.strip('/')
          break
      else:
        self.messages.add(
          'No Instagram profile found. Please <a href="https://indieauth.com/setup">add an Instagram rel-me link</a>, then try again.')
        return self.redirect('/')

      # check that instagram profile links to web site
      try:
        actor = gr_instagram.Instagram(scrape=True).get_actor(
          username, ignore_rate_limit=True)
      except Exception as e:
        code, _ = util.interpret_http_exception(e)
        if code in Instagram.RATE_LIMIT_HTTP_CODES:
          self.messages.add(
            '<a href="https://github.com/snarfed/bridgy/issues/665#issuecomment-524977427">Apologies, Instagram is temporarily blocking us.</a> Please try again later!')

SILOS = (
  'flickr',
  'github',
  'instagram',
  'mastodon',
  'twitter',
)
OAUTHS = {  # maps oauth-dropins module name to module
  name: importlib.import_module('oauth_dropins.%s' % name)
  for name in SILOS
}
SILO_DOMAINS = {cls.DOMAIN for cls in (
  Facebook,
  Flickr,
  GitHub,
  Instagram,
  Twitter,
)}
SCOPE_OVERRIDES = {
  # https://developers.facebook.com/docs/reference/login/
  'facebook': 'user_status,user_posts,user_photos,user_events',
  # https://developer.github.com/apps/building-oauth-apps/scopes-for-oauth-apps/
  'github': 'notifications,public_repo',
  # https://docs.joinmastodon.org/api/permissions/
  'mastodon': 'read',
}


class FrontPageHandler(handlers.TemplateHandler):
  """Renders and serves the front page."""
  handle_exception = handlers.handle_exception

from oauth_dropins.webutil.handlers import TemplateHandler
from oauth_dropins.webutil.util import json_dumps, json_loads
import webapp2

from models import Source
import util


class Instagram(Source):
  """An Instagram account.

  The key name is the username. Instagram usernames may have ASCII letters (case
  insensitive), numbers, periods, and underscores:
  https://stackoverflow.com/questions/15470180
  """
  GR_CLASS = gr_instagram.Instagram
  OAUTH_START_HANDLER = oauth_instagram.StartHandler
  SHORT_NAME = 'instagram'
  FAST_POLL = datetime.timedelta(minutes=120)
  RATE_LIMITED_POLL = Source.SLOW_POLL
  RATE_LIMIT_HTTP_CODES = ('401', '429', '503')
  DISABLE_HTTP_CODES = ()
  CAN_PUBLISH = False
  URL_CANONICALIZER = util.UrlCanonicalizer(
    domain=GR_CLASS.DOMAIN,
    subdomain='www',
    approve=r'https://www.instagram.com/p/[^/?]+/$',
    trailing_slash=True,
    headers=util.REQUEST_HEADERS)
    # no reject regexp; non-private Instagram post URLs just 404

  @staticmethod

# find instagram profile URL
      urls = user_json.get('rel-me', [])
      logging.info('rel-mes: %s', urls)
      for url in util.trim_nulls(urls):
        if util.domain_from_link(url) == gr_instagram.Instagram.DOMAIN:
          username = urllib.parse.urlparse(url).path.strip('/')
          break
      else:
        self.messages.add(
          'No Instagram profile found. Please <a href="https://indieauth.com/setup">add an Instagram rel-me link</a>, then try again.')
        return self.redirect('/')

      # check that instagram profile links to web site
      try:
        actor = gr_instagram.Instagram(scrape=True).get_actor(
          username, ignore_rate_limit=True)
      except Exception as e:
        code, _ = util.interpret_http_exception(e)
        if code in Instagram.RATE_LIMIT_HTTP_CODES:
          self.messages.add(
            '<a href="https://github.com/snarfed/bridgy/issues/665#issuecomment-524977427">Apologies, Instagram is temporarily blocking us.</a> Please try again later!')
          return self.redirect('/')
        else:
          raise

      if not actor:
        self.messages.add("Couldn't find Instagram user '%s'. Please check your site's rel-me link and your Instagram account." % username)
        return self.redirect('/')

      canonicalize = util.UrlCanonicalizer(redirects=False)
      website = canonicalize(auth_entity.key.id())

obj = activity['object']
    obj['ig_like_count'] = media['likes'].get('count', 0)

    # multi-photo
    children = media.get('edge_sidecar_to_children', {}).get('edges', [])
    if children:
      obj['attachments'] = []
      for child in children:
        child_activity = self._json_media_node_to_activity(child.get('node'))
        for att in child_activity['object']['attachments']:
          if not att.get('url'):
            att['url'] = link
          obj['attachments'].append(att)

    self.postprocess_object(obj)
    return super(Instagram, self).postprocess_activity(activity)