I hate the live_chat data format

get_mods.py

import json
import sys

def cmd_maybe(cmd, type):
  return type in cmd

def cmd_as(cmd, type):
  return cmd[type]

def cmds_iter(real_iter, type):
  for i in real_iter:
    yield cmd_as(i, type)

def msg_has_moderator_badge(msg):
  if "authorBadges" not in msg:
    return False

  for badge in cmds_iter(msg["authorBadges"], "liveChatAuthorBadgeRenderer"):
    if "icon" not in badge:
      continue
    icon_type = badge["icon"]["iconType"]
    if icon_type == "MODERATOR":
      return True

  return False

def msg_renderer_from_action(action_data):
  if cmd_maybe(action_data, "addChatItemAction"):
    action = cmd_as(action_data, "addChatItemAction")

    renderer_data = action["item"]
    renderer_potential_types = [
      "liveChatTextMessageRenderer",
      "liveChatPaidMessageRenderer",
      "liveChatPaidStickerRenderer",
      "liveChatSponsorshipsGiftPurchaseAnnouncementRenderer",
      "liveChatSponsorshipsGiftRedemptionAnnouncementRenderer"
    ]
    renderer = None
    for type in renderer_potential_types:
      if cmd_maybe(renderer_data, type):
        renderer = cmd_as(renderer_data, type)
        break
    if renderer is not None and cmd_maybe(renderer_data, "liveChatSponsorshipsGiftPurchaseAnnouncementRenderer"):
      # Why, YouTube?
      return cmd_as(renderer["header"], "liveChatSponsorshipsHeaderRenderer")
    return renderer

  elif cmd_maybe(action_data, "addBannerToLiveChatCommand"):
    action = cmd_as(action_data, "addBannerToLiveChatCommand")

    parent_renderer = cmd_as(action["bannerRenderer"], "liveChatBannerRenderer")
    return cmd_as(parent_renderer["contents"], "liveChatTextMessageRenderer")

  elif cmd_maybe(action_data, "addLiveChatTickerItemAction"):
    action = cmd_as(action_data, "addLiveChatTickerItemAction")

    parent_renderer_data = action["item"]
    if cmd_maybe(parent_renderer_data, "liveChatTickerPaidMessageItemRenderer"):
      parent_renderer = cmd_as(parent_renderer_data, "liveChatTickerPaidMessageItemRenderer")
      renderer_type = "liveChatPaidMessageRenderer"
    elif cmd_maybe(parent_renderer_data, "liveChatTickerPaidStickerItemRenderer"):
      parent_renderer = cmd_as(parent_renderer_data, "liveChatTickerPaidStickerItemRenderer")
      renderer_type = "liveChatPaidStickerRenderer"
    else:
      return None

    render_container = cmd_as(parent_renderer["showItemEndpoint"], "showLiveChatItemEndpoint")
    return cmd_as(render_container["renderer"], renderer_type)

def retrieve_mods_from_lc_cmds(lc):
  moderators = {}

  for cmd in cmds_iter(lc, "replayChatItemAction"):
    for action_data in cmd["actions"]:
      msg = msg_renderer_from_action(action_data)
      if not msg:
        continue

      if msg_has_moderator_badge(msg):
        ucid = msg["authorExternalChannelId"]
        display_name = msg["authorName"]["simpleText"]
        if ucid not in moderators:
          moderators[ucid] = display_name

  return moderators

with open(sys.argv[1], "r") as f:
  lc = json.load(f)
moderators = retrieve_mods_from_lc_cmds(lc)

print("Mods found: %i" % len(moderators))
for ucid, display_name in moderators.items():
  print ("""
* %s
  https://www.youtube.com/channel/%s""" % (display_name, ucid))