Begin work on a data request API (#4045)

[Core] Data Deletion And Disclosure APIs

 - Adds a Data Deletion API
   - Deletion comes in a few forms based on who is requesting
   - Deletion must be handled by 3rd party
 - Adds a Data Collection Disclosure Command
   - Provides a dynamically generated statement from 3rd party
   extensions
 - Modifies the always available commands to be cog compatible
   - Also prevents them from being unloaded accidentally

docs/framework_commands.rst

@@ -13,6 +13,14 @@ extend functionalities used throughout the bot, as outlined below.
 
 .. autofunction:: redbot.core.commands.group
 
+.. autoclass:: redbot.core.commands.Cog
+
+    .. automethod:: format_help_for_context
+    
+    .. automethod:: red_get_data_for_user
+    
+    .. automethod:: red_delete_data_for_user
+
 .. autoclass:: redbot.core.commands.Command
     :members:
     :inherited-members: format_help_for_context

docs/guide_cog_creation.rst

@@ -98,6 +98,7 @@ Open :code:`__init__.py`. In that file, place the following:
 
     from .mycog import Mycog
 
+
     def setup(bot):
         bot.add_cog(Mycog())
 
@@ -238,3 +239,20 @@ Not all of these are strict requirements (some are) but are all generally advisa
     but a cog which takes actions based on messages should not.
 
 15. Respect settings when treating non command messages as commands.
+
+16. Handle user data responsibly
+
+  - Don't do unexpected things with user data.
+  - Don't expose user data to additional audiences without permission.
+  - Don't collect data your cogs don't need.
+  - Don't store data in unexpected locations.
+    Utilize the cog data path, Config, or if you need something more
+    prompt the owner to provide it.
+
+17. Utilize the data deletion and statement APIs
+
+  - See `redbot.core.commands.Cog.red_delete_data_for_user`
+  - Make a statement about what data your cogs use with the module level
+    variable ``__red_end_user_data_statement__``.
+    This should be a string containing a user friendly explanation of what data
+    your cog stores and why.

docs/index.rst

@@ -31,6 +31,7 @@ Welcome to Red - Discord Bot's documentation!
     :caption: User guides:
 
     getting_started
+    red_core_data_statement
 
 .. toctree::
     :maxdepth: 2

docs/red_core_data_statement.rst

@@ -0,0 +1,87 @@
+.. Red Core Data Statement
+
+=====================
+Red and End User Data
+=====================
+
+Notes for everyone
+******************
+
+What data Red collects
+----------------------
+
+Red and the cogs included with it collect some amount of data
+about users for the bot's normal operations. 
+
+In particular the bot will keep track of a short history of usernames/nicknames
+which actions refer to your Discord account (such as creating a playlist)
+as well as the content of specific messages used directly as commands for the bot
+(such as reports sent to servers).
+
+By default, Red will not collect any more data than it needs, and will not use it
+for anything other than the portion of the Red's functionality that necessitated it.
+
+3rd party extensions may store additional data beyond what Red does by default.
+You can use the command ``[p]mydata 3rdparty``
+to view statements about how extensions use your data made by the authors of 
+the specific 3rd party extensions an instance of Red has installed.
+
+How can I delete data Red has about me?
+---------------------------------------
+
+The command ``[p]mydata forgetme`` provides a way for users to remove
+large portions of their own data from the bot. This command will not
+remove operational data, such as a record that your
+Discord account was the target of a moderation action.
+
+3rd party extensions to Red are able to delete data when this command
+is used as well, but this is something each extension must implement.
+If a loaded extension does not implement this, the user will be informed.
+
+Additional Notes for Bot Owners and Hosts
+*****************************************
+
+How to comply with a request from Discord Trust & Safety
+--------------------------------------------------------
+
+There are a handful of these available to bot owners in the command group
+``[p]mydata ownermanagement``.
+
+The most pertinent one if asked to delete data by a member of Trust & Safety
+is
+
+``[p]mydata ownermanagement processdiscordrequest`` 
+
+This will cause the bot to get rid of or disassociate all data
+from the specified user ID. 
+
+.. warning::
+
+    You should not use this unless
+    Discord has specifically requested this with regard to a deleted user.
+    This will remove the user from various anti-abuse measures.
+    If you are processing a manual request from a user, read the next section
+
+
+How to process deletion requests from users
+-------------------------------------------
+
+You can point users to the command ``[p]mydata forgetme`` as a first step.
+
+If users cannot use that for some reason, the command
+
+``[p]mydata ownermanagement deleteforuser``
+
+exists as a way to handle this as if the user had done it themselves.
+
+Be careful about using the other owner level deletion options on behalf of users,
+as this may also result in losing operational data such as data used to prevent spam.
+
+What owners and hosts are responsible for
+-----------------------------------------
+
+Owners and hosts must comply both with Discord's terms of service and any applicable laws.
+Owners and hosts are responsible for all actions their bot takes.
+
+We cannot give specific guidance on this, but recommend that if there are any issues
+you be forthright with users, own up to any mistakes, and do your best to handle it.

redbot/cogs/admin/admin.py

@@ -87,6 +87,10 @@ class Admin(commands.Cog):
     async def cog_before_invoke(self, ctx: commands.Context):
         await self._ready.wait()
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     async def handle_migrations(self):
 
         lock = self.config.get_guilds_lock()

redbot/cogs/alias/__init__.py

@@ -4,5 +4,5 @@ from redbot.core.bot import Red
 
 async def setup(bot: Red):
     cog = Alias(bot)
-    await cog.initialize()
     bot.add_cog(cog)
+    cog.sync_init()

redbot/cogs/alias/alias.py

@@ -1,7 +1,9 @@
+import asyncio
+import logging
 from copy import copy
 from re import search
 from string import Formatter
-from typing import Dict, List
+from typing import Dict, List, Literal
 
 import discord
 from redbot.core import Config, commands, checks
@@ -14,6 +16,8 @@ from .alias_entry import AliasEntry, AliasCache, ArgParseError
 
 _ = Translator("Alias", __file__)
 
+log = logging.getLogger("red.cogs.alias")
+
 
 class _TrackingFormatter(Formatter):
     def __init__(self):
@@ -38,24 +42,107 @@ class Alias(commands.Cog):
     and append them to the stored alias.
     """
 
-    default_global_settings: Dict[str, list] = {"entries": []}
-
-    default_guild_settings: Dict[str, list] = {"entries": []}  # Going to be a list of dicts
-
     def __init__(self, bot: Red):
         super().__init__()
         self.bot = bot
         self.config = Config.get_conf(self, 8927348724)
 
-        self.config.register_global(**self.default_global_settings)
-        self.config.register_guild(**self.default_guild_settings)
+        self.config.register_global(entries=[], handled_string_creator=False)
+        self.config.register_guild(entries=[])
         self._aliases: AliasCache = AliasCache(config=self.config, cache_enabled=True)
+        self._ready_event = asyncio.Event()
+
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        await self._ready_event.wait()
+        await self._aliases.anonymize_aliases(user_id)
+
+    async def cog_before_invoke(self, ctx):
+        await self._ready_event.wait()
+
+    async def _maybe_handle_string_keys(self):
+        # This isn't a normal schema migration because it's being added
+        # after the fact for GH-3788
+        if await self.config.handled_string_creator():
+            return
+
+        async with self.config.entries() as alias_list:
+            bad_aliases = []
+            for a in alias_list:
+                for keyname in ("creator", "guild"):
+                    if isinstance((val := a.get(keyname)), str):
+                        try:
+                            a[keyname] = int(val)
+                        except ValueError:
+                            # Because migrations weren't created as changes were made,
+                            # and the prior form was a string of an ID,
+                            # if this fails, there's nothing to go back to
+                            bad_aliases.append(a)
+                            break
+
+            for a in bad_aliases:
+                alias_list.remove(a)
+
+        # if this was using a custom group of (guild_id, aliasname) it would be better but...
+        all_guild_aliases = await self.config.all_guilds()
+
+        for guild_id, guild_data in all_guild_aliases.items():
+
+            to_set = []
+            modified = False
+
+            for a in guild_data.get("entries", []):
+
+                for keyname in ("creator", "guild"):
+                    if isinstance((val := a.get(keyname)), str):
+                        try:
+                            a[keyname] = int(val)
+                        except ValueError:
+                            break
+                        finally:
+                            modified = True
+                else:
+                    to_set.append(a)
+
+            if modified:
+                await self.config.guild_from_id(guild_id).entries.set(to_set)
+
+            await asyncio.sleep(0)
+            # control yielded per loop since this is most likely to happen
+            # at bot startup, where this is most likely to have a performance
+            # hit.
+
+        await self.config.handled_string_creator.set(True)
+
+    def sync_init(self):
+        t = asyncio.create_task(self._initialize())
+
+        def done_callback(fut: asyncio.Future):
+            try:
+                t.result()
+            except Exception as exc:
+                log.exception("Failed to load alias cog", exc_info=exc)
+                # Maybe schedule extension unloading with message to owner in future
+
+        t.add_done_callback(done_callback)
+
+    async def _initialize(self):
+        """ Should only ever be a task """
+
+        await self._maybe_handle_string_keys()
 
-    async def initialize(self):
-        # This can be where we set the cache_enabled attribute later
         if not self._aliases._loaded:
             await self._aliases.load_aliases()
 
+        self._ready_event.set()
+
     def is_command(self, alias_name: str) -> bool:
         """
         The logic here is that if this returns true, the name should not be used for an alias
@@ -327,6 +414,8 @@ class Alias(commands.Cog):
     @commands.Cog.listener()
     async def on_message_without_command(self, message: discord.Message):
 
+        await self._ready_event.wait()
+
         if message.guild is not None:
             if await self.bot.cog_disabled_in_guild(self, message.guild):
                 return

redbot/cogs/alias/alias_entry.py

@@ -90,6 +90,30 @@ class AliasCache:
         self._loaded = False
         self._aliases: Dict[Optional[int], Dict[str, AliasEntry]] = {None: {}}
 
+    async def anonymize_aliases(self, user_id: int):
+
+        async with self.config.entries() as global_aliases:
+            for a in global_aliases:
+                if a.get("creator", 0) == user_id:
+                    a["creator"] = 0xDE1
+                    if self._cache_enabled:
+                        self._aliases[None][a["name"]] = AliasEntry.from_json(a)
+
+        all_guilds = await self.config.all_guilds()
+        async for guild_id, guild_data in AsyncIter(all_guilds.items(), steps=100):
+            for a in guild_data["entries"]:
+                if a.get("creator", 0) == user_id:
+                    break
+            else:
+                continue
+            # basically, don't build a context manager wihout a need.
+            async with self.config.guild_from_id(guild_id).entries() as entry_list:
+                for a in entry_list:
+                    if a.get("creator", 0) == user_id:
+                        a["creator"] = 0xDE1
+                        if self._cache_enabled:
+                            self._aliases[guild_id][a["name"]] = AliasEntry.from_json(a)
+
     async def load_aliases(self):
         if not self._cache_enabled:
             self._loaded = True

redbot/cogs/audio/apis/playlist_wrapper.py

@@ -27,6 +27,7 @@ from ..sql_statements import (
     PRAGMA_SET_read_uncommitted,
     PRAGMA_SET_temp_store,
     PRAGMA_SET_user_version,
+    HANDLE_DISCORD_DATA_DELETION_QUERY,
 )
 from ..utils import PlaylistScope
 from .api_utils import PlaylistFetchResult
@@ -58,6 +59,8 @@ class PlaylistWrapper:
         self.statement.get_all_with_filter = PLAYLIST_FETCH_ALL_WITH_FILTER
         self.statement.get_all_converter = PLAYLIST_FETCH_ALL_CONVERTER
 
+        self.statement.drop_user_playlists = HANDLE_DISCORD_DATA_DELETION_QUERY
+
     async def init(self) -> None:
         """Initialize the Playlist table"""
         with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
@@ -247,3 +250,11 @@ class PlaylistWrapper:
                     "tracks": json.dumps(tracks),
                 },
             )
+
+    async def handle_playlist_user_id_deletion(self, user_id: int):
+        with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
+            executor.submit(
+                self.database.cursor().execute,
+                self.statement.drop_user_playlists,
+                {"user_id": user_id},
+            )

redbot/cogs/audio/core/events/red.py

@@ -1,5 +1,6 @@
+import asyncio
 import logging
-from typing import Mapping
+from typing import Literal, Mapping
 
 from redbot.core import commands
 from ..abc import MixinMeta
@@ -19,3 +20,37 @@ class RedEvents(MixinMeta, metaclass=CompositeMetaClass):
             self.api_interface.spotify_api.update_token(api_tokens)
         elif service_name == "audiodb":
             self.api_interface.global_cache_api.update_token(api_tokens)
+
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+
+        await self.cog_ready_event.wait()
+
+        if requester in ("discord_deleted_user", "owner"):
+            await self.playlist_api.handle_playlist_user_id_deletion(user_id)
+
+            all_equalizers = await self.config.custom("EQUALIZER").all()
+
+            collected_for_removal = []
+
+            c = 0
+            for guild_id, guild_equalizers in all_equalizers.items():
+                c += 1
+                if not c % 100:
+                    await asyncio.sleep(0)
+
+                for preset_name, preset in guild_equalizers.get("eq_presets", {}).items():
+                    c += 1
+                    if not c % 100:
+                        await asyncio.sleep(0)
+
+                    if preset.get("author", 0) == user_id:
+                        collected_for_removal.append((guild_id, preset_name))
+
+            async with self.config.custom("EQUALIZER").all() as all_eqs:
+                for guild_id, preset_name in collected_for_removal:
+                    all_eqs[str(guild_id)]["eq_presets"][preset_name]["author"] = 0xDE1

redbot/cogs/audio/sql_statements.py

@@ -10,6 +10,8 @@ __all__ = [
     "PRAGMA_SET_read_uncommitted",
     "PRAGMA_FETCH_user_version",
     "PRAGMA_SET_user_version",
+    # Data Deletion statement
+    "HANDLE_DISCORD_DATA_DELETION_QUERY",
     # Playlist table statements
     "PLAYLIST_CREATE_TABLE",
     "PLAYLIST_DELETE",
@@ -82,6 +84,33 @@ PRAGMA_SET_user_version: Final[
 pragma user_version=3;
 """
 
+# Data Deletion
+# This is intentionally 2 seperate transactions due to concerns
+# Draper had. This should prevent it from being a large issue,
+# as this is no different than triggering a bulk deletion now.
+HANDLE_DISCORD_DATA_DELETION_QUERY: Final[
+    str
+] = """
+BEGIN TRANSACTION;
+
+UPDATE playlists
+SET deleted = true
+WHERE scope_id = :user_id ;
+
+UPDATE playlists
+SET author_id = 0xde1
+WHERE author_id = :user_id ;
+
+COMMIT TRANSACTION;
+
+BEGIN TRANSACTION;
+
+DELETE FROM PLAYLISTS
+WHERE deleted=true;
+
+COMMIT TRANSACTION;
+"""
+
 # Playlist table statements
 PLAYLIST_CREATE_TABLE: Final[
     str

redbot/cogs/bank/bank.py

@@ -134,3 +134,7 @@ class Bank(commands.Cog):
         )
 
     # ENDSECTION
+
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return

redbot/cogs/cleanup/cleanup.py

@@ -25,6 +25,10 @@ class Cleanup(commands.Cog):
         super().__init__()
         self.bot = bot
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     @staticmethod
     async def check_100_plus(ctx: commands.Context, number: int) -> bool:
         """

redbot/cogs/customcom/customcom.py

@@ -1,9 +1,10 @@
+import asyncio
 import re
 import random
 from datetime import datetime, timedelta
 from inspect import Parameter
 from collections import OrderedDict
-from typing import Iterable, List, Mapping, Tuple, Dict, Set
+from typing import Iterable, List, Mapping, Tuple, Dict, Set, Literal
 from urllib.parse import quote_plus
 
 import discord
@@ -11,7 +12,7 @@ from fuzzywuzzy import process
 
 from redbot.core import Config, checks, commands
 from redbot.core.i18n import Translator, cog_i18n
-from redbot.core.utils import menus
+from redbot.core.utils import menus, AsyncIter
 from redbot.core.utils.chat_formatting import box, pagify, escape, humanize_list
 from redbot.core.utils.predicates import MessagePredicate
 
@@ -40,15 +41,35 @@ class OnCooldown(CCError):
 
 class CommandObj:
     def __init__(self, **kwargs):
-        config = kwargs.get("config")
+        self.config = kwargs.get("config")
         self.bot = kwargs.get("bot")
-        self.db = config.guild
+        self.db = self.config.guild
 
     @staticmethod
     async def get_commands(config) -> dict:
         _commands = await config.commands()
         return {k: v for k, v in _commands.items() if _commands[k]}
 
+    async def redact_author_ids(self, user_id: int):
+
+        all_guilds = await self.config.all_guilds()
+
+        for guild_id in all_guilds.keys():
+            await asyncio.sleep(0)
+            async with self.config.guild_from_id(guild_id).commands() as all_commands:
+                async for com_name, com_info in AsyncIter(all_commands.items(), steps=100):
+                    if not com_info:
+                        continue
+
+                    if com_info.get("author", {}).get("id", 0) == user_id:
+                        com_info["author"]["id"] = 0xDE1
+                        com_info["author"]["name"] = "Deleted User"
+
+                    if editors := com_info.get("editors", None):
+                        for index, editor_id in enumerate(editors):
+                            if editor_id == user_id:
+                                editors[index] = 0xDE1
+
     async def get_responses(self, ctx):
         intro = _(
             "Welcome to the interactive random {cc} maker!\n"
@@ -200,6 +221,17 @@ class CustomCommands(commands.Cog):
         self.commandobj = CommandObj(config=self.config, bot=self.bot)
         self.cooldowns = {}
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        await self.commandobj.redact_author_ids(user_id)
+
     @commands.group(aliases=["cc"])
     @commands.guild_only()
     async def customcom(self, ctx: commands.Context):
@@ -472,12 +504,14 @@ class CustomCommands(commands.Cog):
         if isinstance(responses, str):
             responses = [responses]
 
-        author = ctx.guild.get_member(cmd["author"]["id"])
-        # If the author is still in the server, show their current name
-        if author:
-            author = "{} ({})".format(author, cmd["author"]["id"])
+        _aid = cmd["author"]["id"]
+
+        if _aid == 0xDE1:
+            author = _("Deleted User")
+        elif member := ctx.guild.get_member(_aid):
+            author = f"{member} ({_aid})"
         else:
-            author = "{} ({})".format(cmd["author"]["name"], cmd["author"]["id"])
+            author = f"{cmd['author']['name']} ({_aid})"
 
         _type = _("Random") if len(responses) > 1 else _("Normal")
 

redbot/cogs/downloader/downloader.py

@@ -91,6 +91,10 @@ class Downloader(commands.Cog):
         if self._init_task is not None:
             self._init_task.cancel()
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     def create_init_task(self):
         def _done_callback(task: asyncio.Task) -> None:
             exc = task.exception()

redbot/cogs/economy/economy.py

@@ -3,7 +3,7 @@ import logging
 import random
 from collections import defaultdict, deque, namedtuple
 from enum import Enum
-from typing import cast, Iterable, Union
+from typing import cast, Iterable, Union, Literal
 
 import discord
 
@@ -11,6 +11,7 @@ from redbot.cogs.bank import is_owner_if_bank_global
 from redbot.cogs.mod.converters import RawUserIds
 from redbot.core import Config, bank, commands, errors, checks
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import box, humanize_number
 from redbot.core.utils.menus import menu, DEFAULT_CONTROLS
 
@@ -136,7 +137,6 @@ class Economy(commands.Cog):
     def __init__(self, bot: Red):
         super().__init__()
         self.bot = bot
-        self.file_path = "data/economy/settings.json"
         self.config = Config.get_conf(self, 1256844281)
         self.config.register_guild(**self.default_guild_settings)
         self.config.register_global(**self.default_global_settings)
@@ -145,6 +145,23 @@ class Economy(commands.Cog):
         self.config.register_role(**self.default_role_settings)
         self.slot_register = defaultdict(dict)
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        await self.config.user_from_id(user_id).clear()
+
+        all_members = await self.config.all_members()
+
+        async for guild_id, guild_data in AsyncIter(all_members.items(), steps=100):
+            if user_id in guild_data:
+                await self.config.member_from_ids(guild_id, user_id).clear()
+
     @guild_only_check()
     @commands.group(name="bank")
     async def _bank(self, ctx: commands.Context):

redbot/cogs/filter/filter.py

@@ -1,10 +1,11 @@
 import discord
 import re
-from typing import Union, Set
+from typing import Union, Set, Literal
 
 from redbot.core import checks, Config, modlog, commands
 from redbot.core.bot import Red
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import pagify, humanize_list
 
 _ = Translator("Filter", __file__)
@@ -33,6 +34,21 @@ class Filter(commands.Cog):
         self.register_task = self.bot.loop.create_task(self.register_filterban())
         self.pattern_cache = {}
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        all_members = await self.config.all_members()
+
+        async for guild_id, guild_data in AsyncIter(all_members.items(), steps=100):
+            if user_id in guild_data:
+                await self.config.member_from_ids(guild_id, user_id).clear()
+
     def cog_unload(self):
         self.register_task.cancel()
 

redbot/cogs/general/general.py

@@ -75,6 +75,10 @@ class General(commands.Cog):
         super().__init__()
         self.stopwatches = {}
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     @commands.command()
     async def choose(self, ctx, *choices):
         """Choose between multiple options.

redbot/cogs/image/image.py

@@ -26,6 +26,10 @@ class Image(commands.Cog):
     def cog_unload(self):
         self.session.detach()
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     async def initialize(self) -> None:
         """Move the API keys from cog stored config to core bot config if they exist."""
         imgur_token = await self.config.imgur_client_id()

redbot/cogs/mod/mod.py

@@ -3,7 +3,7 @@ import logging
 import re
 from abc import ABC
 from collections import defaultdict
-from typing import List, Tuple
+from typing import List, Tuple, Literal
 
 import discord
 from redbot.core.utils import AsyncIter
@@ -83,6 +83,34 @@ class Mod(
 
         self._ready = asyncio.Event()
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        all_members = await self.config.all_members()
+
+        async for guild_id, guild_data in AsyncIter(all_members.items(), steps=100):
+            if user_id in guild_data:
+                await self.config.member_from_ids(guild_id, user_id).clear()
+
+        await self.config.user_from_id(user_id).clear()
+
+        guild_data = await self.config.all_guilds()
+
+        async for guild_id, guild_data in AsyncIter(guild_data.items(), steps=100):
+            if user_id in guild_data["current_tempbans"]:
+                async with self.config.guild_from_id(guild_id).current_tempbans() as tbs:
+                    try:
+                        tbs.remove(user_id)
+                    except ValueError:
+                        pass
+                    # possible with a context switch between here and getting all guilds
+
     async def initialize(self):
         await self._maybe_update_config()
         self._ready.set()

redbot/cogs/modlog/modlog.py

@@ -20,6 +20,10 @@ class ModLog(commands.Cog):
         super().__init__()
         self.bot = bot
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     @commands.group()
     @checks.guildowner_or_permissions(administrator=True)
     async def modlogset(self, ctx: commands.Context):

redbot/cogs/permissions/converters.py

@@ -138,12 +138,19 @@ class CogOrCommand(NamedTuple):
     # noinspection PyArgumentList
     @classmethod
     async def convert(cls, ctx: commands.Context, arg: str) -> "CogOrCommand":
-        cog = ctx.bot.get_cog(arg)
-        if cog:
-            return cls(type="COG", name=cog.__class__.__name__, obj=cog)
-        cmd = ctx.bot.get_command(arg)
-        if cmd:
-            return cls(type="COMMAND", name=cmd.qualified_name, obj=cmd)
+        ret = None
+        if cog := ctx.bot.get_cog(arg):
+            ret = cls(type="COG", name=cog.qualified_name, obj=cog)
+
+        elif cmd := ctx.bot.get_command(arg):
+            ret = cls(type="COMMAND", name=cmd.qualified_name, obj=cmd)
+
+        if ret:
+            if isinstance(ret.obj, commands.commands._RuleDropper):
+                raise commands.BadArgument(
+                    "You cannot apply permission rules to this cog or command."
+                )
+            return ret
 
         raise commands.BadArgument(
             _(

redbot/cogs/permissions/permissions.py

@@ -2,7 +2,7 @@ import asyncio
 import io
 import textwrap
 from copy import copy
-from typing import Union, Optional, Dict, List, Tuple, Any, Iterator, ItemsView, cast
+from typing import Union, Optional, Dict, List, Tuple, Any, Iterator, ItemsView, Literal, cast
 
 import discord
 import yaml
@@ -10,6 +10,7 @@ from schema import And, Or, Schema, SchemaError, Optional as UseOptional
 from redbot.core import checks, commands, config
 from redbot.core.bot import Red
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import box
 from redbot.core.utils.menus import start_adding_reactions
 from redbot.core.utils.predicates import ReactionPredicate, MessagePredicate
@@ -114,6 +115,56 @@ class Permissions(commands.Cog):
         self.config.init_custom(COMMAND, 1)
         self.config.register_custom(COMMAND)
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        count = 0
+
+        _uid = str(user_id)
+
+        # The dict as returned here as string keys. Above is for comparison,
+        # there's a below recast to int where needed for guild ids
+
+        for typename, getter in ((COG, self.bot.get_cog), (COMMAND, self.bot.get_command)):
+
+            obj_type_rules = await self.config.custom(typename).all()
+
+            count += 1
+            if not count % 100:
+                await asyncio.sleep(0)
+
+            for obj_name, rules_dict in obj_type_rules.items():
+
+                count += 1
+                if not count % 100:
+                    await asyncio.sleep(0)
+
+                obj = getter(obj_name)
+
+                for guild_id, guild_rules in rules_dict.items():
+
+                    count += 1
+                    if not count % 100:
+                        await asyncio.sleep(0)
+
+                    if _uid in guild_rules:
+                        if obj:
+                            # delegate to remove rule here
+                            await self._remove_rule(
+                                CogOrCommand(typename, obj.qualified_name, obj),
+                                user_id,
+                                int(guild_id),
+                            )
+                        else:
+                            grp = self.config.custom(typename, obj_name)
+                            await grp.clear_raw(guild_id, user_id)
+
     async def __permissions_hook(self, ctx: commands.Context) -> Optional[bool]:
         """
         Purpose of this hook is to prevent guild owner lockouts of permissions specifically
@@ -345,14 +396,6 @@ class Permissions(commands.Cog):
         if not who_or_what:
             await ctx.send_help()
             return
-        if isinstance(cog_or_command.obj, commands.commands._AlwaysAvailableCommand):
-            await ctx.send(
-                _(
-                    "This command is designated as being always available and "
-                    "cannot be modified by permission rules."
-                )
-            )
-            return
         for w in who_or_what:
             await self._add_rule(
                 rule=cast(bool, allow_or_deny),
@@ -388,14 +431,6 @@ class Permissions(commands.Cog):
         if not who_or_what:
             await ctx.send_help()
             return
-        if isinstance(cog_or_command.obj, commands.commands._AlwaysAvailableCommand):
-            await ctx.send(
-                _(
-                    "This command is designated as being always available and "
-                    "cannot be modified by permission rules."
-                )
-            )
-            return
         for w in who_or_what:
             await self._add_rule(
                 rule=cast(bool, allow_or_deny),
@@ -473,14 +508,6 @@ class Permissions(commands.Cog):
         `<cog_or_command>` is the cog or command to set the default
         rule for. This is case sensitive.
         """
-        if isinstance(cog_or_command.obj, commands.commands._AlwaysAvailableCommand):
-            await ctx.send(
-                _(
-                    "This command is designated as being always available and "
-                    "cannot be modified by permission rules."
-                )
-            )
-            return
         await self._set_default_rule(
             rule=cast(Optional[bool], allow_or_deny),
             cog_or_cmd=cog_or_command,
@@ -504,14 +531,6 @@ class Permissions(commands.Cog):
         `<cog_or_command>` is the cog or command to set the default
         rule for. This is case sensitive.
         """
-        if isinstance(cog_or_command.obj, commands.commands._AlwaysAvailableCommand):
-            await ctx.send(
-                _(
-                    "This command is designated as being always available and "
-                    "cannot be modified by permission rules."
-                )
-            )
-            return
         await self._set_default_rule(
             rule=cast(Optional[bool], allow_or_deny), cog_or_cmd=cog_or_command, guild_id=GLOBAL
         )

redbot/cogs/reports/reports.py

@@ -1,6 +1,6 @@
 import logging
 import asyncio
-from typing import Union, List
+from typing import Union, List, Literal
 from datetime import timedelta
 from copy import copy
 import contextlib
@@ -60,6 +60,39 @@ class Reports(commands.Cog):
         # (guild, ticket#):
         #   {'tun': Tunnel, 'msgs': List[int]}
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        all_reports = await self.config.custom("REPORT").all()
+
+        steps = 0
+        paths = []
+
+        # this doesn't use async iter intentionally due to the nested iterations
+        for guild_id_str, tickets in all_reports.items():
+            for ticket_number, ticket in tickets.items():
+                steps += 1
+                if not steps % 100:
+                    await asyncio.sleep(0)  # yield context
+
+            if ticket.get("report", {}).get("user_id", 0) == user_id:
+                paths.append((guild_id_str, ticket_number))
+
+        async with self.config.custom("REPORT").all() as all_reports:
+            async for guild_id_str, ticket_number in AsyncIter(paths, steps=100):
+                r = all_reports[guild_id_str][ticket_number]["report"]
+                r["user_id"] = 0xDE1
+                # this might include EUD, and a report of a deleted user
+                # that's been unhandled for long enough for the
+                # user to be deleted and the bot recieve a request like this...
+                r["report"] = "[REPORT DELETED DUE TO DISCORD REQUEST]"
+
     @property
     def tunnels(self):
         return [x["tun"] for x in self.tunnel_store.values()]

redbot/cogs/streams/streams.py

@@ -79,6 +79,10 @@ class Streams(commands.Cog):
         self._ready_event: asyncio.Event = asyncio.Event()
         self._init_task: asyncio.Task = self.bot.loop.create_task(self.initialize())
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete """
+        return
+
     def check_name_or_id(self, data: str) -> bool:
         matched = self.yt_cid_pattern.fullmatch(data)
         if matched is None:

redbot/cogs/trivia/trivia.py

@@ -3,7 +3,7 @@ import asyncio
 import math
 import pathlib
 from collections import Counter
-from typing import List
+from typing import List, Literal
 
 import io
 import yaml
@@ -13,6 +13,7 @@ from redbot.core import Config, commands, checks
 from redbot.cogs.bank import is_owner_if_bank_global
 from redbot.core.data_manager import cog_data_path
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import box, pagify, bold
 from redbot.core.utils.menus import start_adding_reactions
 from redbot.core.utils.predicates import MessagePredicate, ReactionPredicate
@@ -56,6 +57,21 @@ class Trivia(commands.Cog):
 
         self.config.register_member(wins=0, games=0, total_score=0)
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        all_members = await self.config.all_members()
+
+        async for guild_id, guild_data in AsyncIter(all_members.items(), steps=100):
+            if user_id in guild_data:
+                await self.config.member_from_ids(guild_id, user_id).clear()
+
     @commands.group()
     @commands.guild_only()
     @checks.mod_or_permissions(administrator=True)

redbot/cogs/warnings/warnings.py

@@ -1,7 +1,8 @@
+import asyncio
 import contextlib
 from collections import namedtuple
 from copy import copy
-from typing import Union, Optional
+from typing import Union, Optional, Literal
 
 import discord
 
@@ -14,6 +15,7 @@ from redbot.cogs.warnings.helpers import (
 from redbot.core import Config, checks, commands, modlog
 from redbot.core.bot import Red
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import warning, pagify
 from redbot.core.utils.menus import menu, DEFAULT_CONTROLS
 
@@ -45,6 +47,41 @@ class Warnings(commands.Cog):
         self.bot = bot
         self.registration_task = self.bot.loop.create_task(self.register_warningtype())
 
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        all_members = await self.config.all_members()
+
+        c = 0
+
+        for guild_id, guild_data in all_members.items():
+            c += 1
+            if not c % 100:
+                await asyncio.sleep(0)
+
+            if user_id in guild_data:
+                await self.config.member_from_ids(guild_id, user_id).clear()
+
+            for remaining_user, user_warns in guild_data.items():
+                c += 1
+                if not c % 100:
+                    await asyncio.sleep(0)
+
+                for warn_id, warning in user_warns.get("warnings", {}).items():
+                    c += 1
+                    if not c % 100:
+                        await asyncio.sleep(0)
+
+                    if warning.get("mod", 0) == user_id:
+                        grp = self.config.member_from_ids(guild_id, remaining_user)
+                        await grp.set_raw("warnings", warn_id, "mod", value=0xDE1)
+
     # We're not utilising modlog yet - no need to register a casetype
     @staticmethod
     async def register_warningtype():
@@ -489,7 +526,11 @@ class Warnings(commands.Cog):
             else:
                 for key in user_warnings.keys():
                     mod_id = user_warnings[key]["mod"]
-                    mod = ctx.bot.get_user(mod_id) or _("Unknown Moderator ({})").format(mod_id)
+                    if mod_id == 0xDE1:
+                        mod = _("Deleted Moderator")
+                    else:
+                        bot = ctx.bot
+                        mod = bot.get_user(mod_id) or _("Unknown Moderator ({})").format(mod_id)
                     msg += _(
                         "{num_points} point warning {reason_name} issued by {user} for "
                         "{description}\n"
@@ -519,7 +560,11 @@ class Warnings(commands.Cog):
             else:
                 for key in user_warnings.keys():
                     mod_id = user_warnings[key]["mod"]
-                    mod = ctx.bot.get_user(mod_id) or _("Unknown Moderator ({})").format(mod_id)
+                    if mod_id == 0xDE1:
+                        mod = _("Deleted Moderator")
+                    else:
+                        bot = ctx.bot
+                        mod = bot.get_user(mod_id) or _("Unknown Moderator ({})").format(mod_id)
                     msg += _(
                         "{num_points} point warning {reason_name} issued by {user} for "
                         "{description}\n"

redbot/core/bank.py

@@ -2,17 +2,18 @@ from __future__ import annotations
 
 import asyncio
 import datetime
-from typing import Union, List, Optional, TYPE_CHECKING
+import logging
+from typing import Union, List, Optional, TYPE_CHECKING, Literal
 from functools import wraps
 
 import discord
 
+from redbot.core.utils import AsyncIter
 from redbot.core.utils.chat_formatting import humanize_number
 from . import Config, errors, commands
 from .i18n import Translator
 
 from .errors import BankPruneError
-from .utils import AsyncIter
 
 if TYPE_CHECKING:
     from .bot import Red
@@ -67,6 +68,10 @@ _DEFAULT_USER = _DEFAULT_MEMBER
 
 _config: Config = None
 
+log = logging.getLogger("red.core.bank")
+
+_data_deletion_lock = asyncio.Lock()
+
 
 def _init():
     global _config
@@ -77,6 +82,28 @@ def _init():
     _config.register_user(**_DEFAULT_USER)
 
 
+async def _process_data_deletion(
+    *, requester: Literal["discord_deleted_user", "owner", "user", "user_strict"], user_id: int
+):
+    """
+    Bank has no reason to keep any of this data
+    if the user doesn't want it kept,
+    we won't special case any request type
+    """
+    if requester not in ("discord_deleted_user", "owner", "user", "user_strict"):
+        log.warning(
+            "Got unknown data request type `{req_type}` for user, deleting anyway",
+            req_type=requester,
+        )
+
+    async with _data_deletion_lock:
+        await _config.user_from_id(user_id).clear()
+        all_members = await _config.all_members()
+        async for guild_id, member_dict in AsyncIter(all_members.items(), steps=100):
+            if user_id in member_dict:
+                await _config.member_from_ids(guild_id, user_id).clear()
+
+
 class Account:
     """A single account.
 

redbot/core/bot.py

@@ -6,6 +6,8 @@ import platform
 import shutil
 import sys
 import contextlib
+import weakref
+import functools
 from collections import namedtuple
 from datetime import datetime
 from enum import IntEnum
@@ -22,6 +24,8 @@ from typing import (
     Callable,
     Awaitable,
     Any,
+    Literal,
+    MutableMapping,
 )
 from types import MappingProxyType
 
@@ -31,7 +35,7 @@ from discord.ext.commands import when_mentioned_or
 
 from . import Config, i18n, commands, errors, drivers, modlog, bank
 from .cog_manager import CogManager, CogManagerUI
-from .core_commands import license_info_command, Core
+from .core_commands import Core
 from .data_manager import cog_data_path
 from .dev_commands import Dev
 from .events import init_events
@@ -45,7 +49,7 @@ from .settings_caches import (
 )
 
 from .rpc import RPCMixin
-from .utils import common_filters
+from .utils import common_filters, AsyncIter
 from .utils._internal_utils import send_to_owners_with_prefix_replaced
 
 CUSTOM_GROUPS = "CUSTOM_GROUPS"
@@ -57,6 +61,8 @@ __all__ = ["RedBase", "Red", "ExitCodes"]
 
 NotMessage = namedtuple("NotMessage", "guild")
 
+DataDeletionResults = namedtuple("DataDeletionResults", "failed_modules failed_cogs unhandled")
+
 PreInvokeCoroutine = Callable[[commands.Context], Awaitable[Any]]
 T_BIC = TypeVar("T_BIC", bound=PreInvokeCoroutine)
 
@@ -117,6 +123,8 @@ class RedBase(
             last_system_info__machine=None,
             last_system_info__system=None,
             schema_version=0,
+            datarequests__allow_user_requests=True,
+            datarequests__user_requests_are_strict=True,
         )
 
         self._config.register_guild(
@@ -198,6 +206,8 @@ class RedBase(
         self._red_ready = asyncio.Event()
         self._red_before_invoke_objs: Set[PreInvokeCoroutine] = set()
 
+        self._deletion_requests: MutableMapping[int, asyncio.Lock] = weakref.WeakValueDictionary()
+
     def get_command(self, name: str) -> Optional[commands.Command]:
         com = super().get_command(name)
         assert com is None or isinstance(com, commands.Command)
@@ -219,7 +229,7 @@ class RedBase(
 
     async def _red_before_invoke_method(self, ctx):
         await self.wait_until_red_ready()
-        return_exceptions = isinstance(ctx.command, commands.commands._AlwaysAvailableCommand)
+        return_exceptions = isinstance(ctx.command, commands.commands._RuleDropper)
         if self._red_before_invoke_objs:
             await asyncio.gather(
                 *(coro(ctx) for coro in self._red_before_invoke_objs),
@@ -666,7 +676,6 @@ class RedBase(
 
         self.add_cog(Core(self))
         self.add_cog(CogManagerUI())
-        self.add_command(license_info_command)
         if cli_flags.dev:
             self.add_cog(Dev())
 
@@ -1040,7 +1049,7 @@ class RedBase(
 
     def remove_cog(self, cogname: str):
         cog = self.get_cog(cogname)
-        if cog is None:
+        if cog is None or isinstance(cog, commands.commands._RuleDropper):
             return
 
         for cls in inspect.getmro(cog.__class__):
@@ -1197,6 +1206,9 @@ class RedBase(
                     subcommand.requires.ready_event.set()
 
     def remove_command(self, name: str) -> None:
+        command = self.get_command(name)
+        if isinstance(command, commands.commands._RuleDropper):
+            return
         command = super().remove_command(name)
         if not command:
             return
@@ -1395,6 +1407,124 @@ class RedBase(
         await self.logout()
         sys.exit(self._shutdown_mode)
 
+    async def _core_data_deletion(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        if requester != "discord_deleted_user":
+            return
+
+        await self._config.user_from_id(user_id).clear()
+        all_guilds = await self._config.all_guilds()
+
+        async for guild_id, guild_data in AsyncIter(all_guilds.items(), steps=100):
+            if user_id in guild_data.get("autoimmune_ids", []):
+                async with self._config.guild_from_id(guild_id).autoimmune_ids() as ids:
+                    # prevent a racy crash here without locking
+                    # up the vals in all guilds first
+                    with contextlib.suppress(ValueError):
+                        ids.remove(user_id)
+
+        await self._whiteblacklist_cache.discord_deleted_user(user_id)
+
+    async def handle_data_deletion_request(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ) -> DataDeletionResults:
+        """
+        This tells each cog and extension, as well as any APIs in Red
+        to go delete data
+
+        Calling this should be limited to interfaces designed for it.
+
+        See ``redbot.core.commands.Cog.delete_data_for_user``
+        for details about the parameters and intent.
+
+        Parameters
+        ----------
+        requester
+        user_id
+
+        Returns
+        -------
+        DataDeletionResults
+            A named tuple ``(failed_modules, failed_cogs, unhandled)``
+            containing lists with names of failed modules, failed cogs,
+            and cogs that didn't handle data deletion request.
+        """
+        await self.wait_until_red_ready()
+        lock = self._deletion_requests.setdefault(user_id, asyncio.Lock())
+        async with lock:
+            return await self._handle_data_deletion_request(requester=requester, user_id=user_id)
+
+    async def _handle_data_deletion_request(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ) -> DataDeletionResults:
+        """
+        Actual interface for the above.
+
+        Parameters
+        ----------
+        requester
+        user_id
+
+        Returns
+        -------
+        DataDeletionResults
+        """
+        extension_handlers = {
+            extension_name: handler
+            for extension_name, extension in self.extensions.items()
+            if (handler := getattr(extension, "red_delete_data_for_user", None))
+        }
+
+        cog_handlers = {
+            cog_qualname: cog.red_delete_data_for_user for cog_qualname, cog in self.cogs.items()
+        }
+
+        special_handlers = {
+            "Red Core Modlog API": modlog._process_data_deletion,
+            "Red Core Bank API": bank._process_data_deletion,
+            "Red Core Bot Data": self._core_data_deletion,
+        }
+
+        failures = {
+            "extension": [],
+            "cog": [],
+            "unhandled": [],
+        }
+
+        async def wrapper(func, stype, sname):
+            try:
+                await func(requester=requester, user_id=user_id)
+            except commands.commands.RedUnhandledAPI:
+                log.warning(f"{stype}.{sname} did not handle data deletion ")
+                failures["unhandled"].append(sname)
+            except Exception as exc:
+                log.exception(f"{stype}.{sname} errored when handling data deletion ")
+                failures[stype].append(sname)
+
+        handlers = [
+            *(wrapper(coro, "extension", name) for name, coro in extension_handlers.items()),
+            *(wrapper(coro, "cog", name) for name, coro in cog_handlers.items()),
+            *(wrapper(coro, "extension", name) for name, coro in special_handlers.items()),
+        ]
+
+        await asyncio.gather(*handlers)
+
+        return DataDeletionResults(
+            failed_modules=failures["extension"],
+            failed_cogs=failures["cog"],
+            unhandled=failures["unhandled"],
+        )
+
 
 # This can be removed, and the parent class renamed as a breaking change
 class Red(RedBase):

redbot/core/cog_manager.py

@@ -311,6 +311,10 @@ _ = Translator("CogManagerUI", __file__)
 class CogManagerUI(commands.Cog):
     """Commands to interface with Red's cog manager."""
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete (Core Config is handled in a bot method ) """
+        return
+
     @commands.command()
     @checks.is_owner()
     async def paths(self, ctx: commands.Context):

redbot/core/commands/__init__.py

@@ -15,6 +15,7 @@ from .commands import (
     GroupMixin as GroupMixin,
     command as command,
     group as group,
+    RedUnhandledAPI as RedUnhandledAPI,
     RESERVED_COMMAND_NAMES as RESERVED_COMMAND_NAMES,
 )
 from .context import Context as Context, GuildContext as GuildContext, DMContext as DMContext

redbot/core/commands/commands.py

@@ -6,19 +6,23 @@ be used instead of those from the `discord.ext.commands` module.
 from __future__ import annotations
 
 import inspect
+import io
 import re
 import functools
 import weakref
 from typing import (
+    Any,
     Awaitable,
     Callable,
     Dict,
     List,
+    Literal,
     Optional,
     Tuple,
     Union,
     MutableMapping,
     TYPE_CHECKING,
+    cast,
 )
 
 import discord
@@ -55,6 +59,7 @@ __all__ = [
     "command",
     "group",
     "RESERVED_COMMAND_NAMES",
+    "RedUnhandledAPI",
 ]
 
 #: The following names are reserved for various reasons
@@ -66,6 +71,12 @@ _ = Translator("commands.commands", __file__)
 DisablerDictType = MutableMapping[discord.Guild, Callable[["Context"], Awaitable[bool]]]
 
 
+class RedUnhandledAPI(Exception):
+    """ An exception which can be raised to signal a lack of handling specific APIs """
+
+    pass
+
+
 class CogCommandMixin:
     """A mixin for cogs and commands."""
 
@@ -731,6 +742,7 @@ class CogGroupMixin:
             whether or not the rule was changed as a result of this
             call.
 
+        :meta private:
         """
         cur_rule = self.requires.get_rule(model_id, guild_id=guild_id)
         if cur_rule not in (PermState.NORMAL, PermState.ACTIVE_ALLOW, PermState.ACTIVE_DENY):
@@ -809,6 +821,136 @@ class CogMixin(CogGroupMixin, CogCommandMixin):
         if doc:
             return inspect.cleandoc(translator(doc))
 
+    async def red_get_data_for_user(self, *, user_id: int) -> MutableMapping[str, io.BytesIO]:
+        """
+
+        .. note::
+
+            This method is documented provisionally
+            and may have minor changes made to it.
+            It is not expected to undergo major changes,
+            but nothing utilizes this method yet and the inclusion of this method
+            in documentation in advance is solely to allow cog creators time to prepare.
+
+
+        This should be overridden by all cogs.
+
+        Overridden implementations should return a mapping of filenames to io.BytesIO
+        containing a human-readable version of the data
+        the cog has about the specified user_id or an empty mapping
+        if the cog does not have end user data.
+
+        The data should be easily understood for what it represents to
+        most users of age to use Discord.
+
+        You may want to include a readme file
+        which explains specifics about the data.
+
+        This method may also be implemented for an extension.
+
+        Parameters
+        ----------
+        user_id: int
+
+        Returns
+        -------
+        MutableMapping[str, io.BytesIO]
+            A mapping of filenames to BytesIO objects
+            suitable to send as a files or as part of an archive to a user.
+
+            This may be empty if you don't have data for users.
+
+        Raises
+        ------
+        RedUnhandledAPI
+            If the method was not overriden,
+            or an overriden implementation is not handling this
+
+        """
+        raise RedUnhandledAPI()
+
+    async def red_delete_data_for_user(
+        self,
+        *,
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"],
+        user_id: int,
+    ):
+        """
+        This should be overridden by all cogs.
+
+        If your cog does not store data, overriding and doing nothing should still
+        be done to indicate that this has been considered.
+
+        .. note::
+                This may receive other strings in the future without warning
+                you should safely handle
+                any string value (log a warning if needed)
+                as additional requester types may be added
+                in the future without prior warning.
+                (see what this method can raise for details)
+
+
+        This method can currently be passed one of these strings:
+
+
+            - ``"discord_deleted_user"``:
+
+                The request should be processed as if
+                Discord has asked for the data removal
+                This then additionally must treat the
+                user ID itself as something to be deleted.
+                The user ID is no longer operational data
+                as the ID no longer refers to a valid user.
+
+            - ``"owner"``:
+
+                The request was made by the bot owner.
+                If removing the data requested by the owner
+                would be an operational hazard
+                (such as removing a user id from a blocked user list)
+                you may elect to inform the user of an alternative way
+                to remove that ID to ensure the process can not be abused
+                by users to bypass anti-abuse measures,
+                but there must remain a way for them to process this request.
+
+            - ``"user_strict"``:
+
+                The request was made by a user,
+                the bot settings allow a user to request their own data
+                be deleted, and the bot is configured to respect this
+                at the cost of functionality.
+                Cogs may retain data needed for anti abuse measures
+                such as IDs and timestamps of interactions,
+                but should not keep EUD such
+                as user nicknames if receiving a request of this nature.
+
+            - ``"user"``:
+
+                The request was made by a user,
+                the bot settings allow a user to request their own data
+                be deleted, and the bot is configured to let cogs keep
+                data needed for operation.
+                Under this case, you may elect to retain data which is
+                essential to the functionality of the cog. This case will
+                only happen if the bot owner has opted into keeping
+                minimal EUD needed for cog functionality.
+
+
+        Parameters
+        ----------
+        requester: Literal["discord_deleted_user", "owner", "user", "user_strict"]
+            See above notes for details about this parameter
+        user_id: int
+            The user ID which needs deletion handling
+
+        Raises
+        ------
+        RedUnhandledAPI
+            If the method was not overriden,
+            or an overriden implementation is not handling this
+        """
+        raise RedUnhandledAPI()
+
     async def can_run(self, ctx: "Context", **kwargs) -> bool:
         """
         This really just exists to allow easy use with other methods using can_run
@@ -826,6 +968,8 @@ class CogMixin(CogGroupMixin, CogCommandMixin):
         -------
         bool
             ``True`` if this cog is usable in the given context.
+
+        :meta private:
         """
 
         try:
@@ -854,6 +998,7 @@ class CogMixin(CogGroupMixin, CogCommandMixin):
         bool
             ``True`` if this cog is visible in the given context.
 
+        :meta private:
         """
 
         return await self.can_run(ctx)
@@ -873,6 +1018,8 @@ class Cog(CogMixin, DPYCog, metaclass=DPYCogMeta):
         """
         This does not have identical behavior to
         Group.all_commands but should return what you expect
+
+        :meta private:
         """
         return {cmd.name: cmd for cmd in self.__cog_commands__}
 
@@ -917,13 +1064,15 @@ def get_command_disabler(guild: discord.Guild) -> Callable[["Context"], Awaitabl
         return disabler
 
 
-# This is intentionally left out of `__all__` as it is not intended for general use
-class _AlwaysAvailableCommand(Command):
+# The below are intentionally left out of `__all__`
+# as they are not intended for general use
+class _AlwaysAvailableMixin:
     """
-    This should be used only for informational commands
+    This should be used for commands
     which should not be disabled or removed
 
-    These commands cannot belong to a cog.
+    These commands cannot belong to any cog except Core (core_commands.py)
+    to prevent issues with the appearance of certain behavior.
 
     These commands do not respect most forms of checks, and
     should only be used with that in mind.
@@ -931,10 +1080,56 @@ class _AlwaysAvailableCommand(Command):
     This particular class is not supported for 3rd party use
     """
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        if self.cog is not None:
-            raise TypeError("This command may not be added to a cog")
-
     async def can_run(self, ctx, *args, **kwargs) -> bool:
         return not ctx.author.bot
+
+    can_see = can_run
+
+
+class _RuleDropper(CogCommandMixin):
+    """
+    Objects inheriting from this, be they command or cog,
+    should not be interfered with operation except by their own rules,
+    or by global checks which are not tailored for these objects but instead
+    on global abuse prevention
+    (such as a check that disallows blocked users and bots from interacting.)
+
+    This should not be used by 3rd-party extensions directly for their own objects.
+    """
+
+    def allow_for(self, model_id: Union[int, str], guild_id: int) -> None:
+        """ This will do nothing. """
+
+    def deny_to(self, model_id: Union[int, str], guild_id: int) -> None:
+        """ This will do nothing. """
+
+    def clear_rule_for(
+        self, model_id: Union[int, str], guild_id: int
+    ) -> Tuple[PermState, PermState]:
+        """
+        This will do nothing, except return a compatible rule
+        """
+        cur_rule = self.requires.get_rule(model_id, guild_id=guild_id)
+        return cur_rule, cur_rule
+
+    def set_default_rule(self, rule: Optional[bool], guild_id: int) -> None:
+        """ This will do nothing. """
+
+
+class _AlwaysAvailableCommand(_AlwaysAvailableMixin, _RuleDropper, Command):
+    pass
+
+
+class _AlwaysAvailableGroup(_AlwaysAvailableMixin, _RuleDropper, Group):
+    pass
+
+
+class _ForgetMeSpecialCommand(_RuleDropper, Command):
+    """
+    We need special can_run behavior here
+    """
+
+    async def can_run(self, ctx, *args, **kwargs) -> bool:
+        return await ctx.bot._config.datarequests.allow_user_requests()
+
+    can_see = can_run

redbot/core/core_commands.py

@@ -4,6 +4,9 @@ import datetime
 import importlib
 import itertools
 import logging
+import io
+import random
+import markdown
 import os
 import re
 import sys
@@ -11,15 +14,12 @@ import platform
 import getpass
 import pip
 import traceback
-from collections import namedtuple
 from pathlib import Path
-from random import SystemRandom
 from string import ascii_letters, digits
 from typing import TYPE_CHECKING, Union, Tuple, List, Optional, Iterable, Sequence, Dict, Set
 
 import aiohttp
 import discord
-import pkg_resources
 from babel import Locale as BabelLocale, UnknownLocaleError
 from redbot.core.data_manager import storage_type
 
@@ -29,10 +29,8 @@ from . import (
     VersionInfo,
     checks,
     commands,
-    drivers,
     errors,
     i18n,
-    config,
 )
 from .utils import AsyncIter
 from .utils._internal_utils import fetch_latest_red_version_info
@@ -49,6 +47,43 @@ from .utils.chat_formatting import (
 from .commands.requires import PrivilegeLevel
 
 
+_entities = {
+    "*": "*",
+    "\\": "\",
+    "`": "`",
+    "!": "!",
+    "{": "{",
+    "[": "[",
+    "_": "_",
+    "(": "(",
+    "#": "#",
+    ".": ".",
+    "+": "+",
+    "}": "}",
+    "]": "]",
+    ")": ")",
+}
+
+PRETTY_HTML_HEAD = """
+<!DOCTYPE html>
+<html>
+<head><meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>3rd Party Data Statements</title>
+<style type="text/css">
+body{margin:2em auto;max-width:800px;line-height:1.4;font-size:16px;
+background-color=#EEEEEE;color:#454545;padding:1em;text-align:justify}
+h1,h2,h3{line-height:1.2}
+</style></head><body>
+"""  # This ends up being a small bit extra that really makes a difference.
+
+HTML_CLOSING = "</body></html>"
+
+
+def entity_transformer(statement: str) -> str:
+    return "".join(_entities.get(c, c) for c in statement)
+
+
 if TYPE_CHECKING:
     from redbot.core.bot import Red
 
@@ -300,9 +335,13 @@ class CoreLogic:
 
 
 @i18n.cog_i18n(_)
-class Core(commands.Cog, CoreLogic):
+class Core(commands.commands._RuleDropper, commands.Cog, CoreLogic):
     """Commands related to core functions."""
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete (Core Config is handled in a bot method ) """
+        return
+
     @commands.command(hidden=True)
     async def ping(self, ctx: commands.Context):
         """Pong."""
@@ -443,6 +482,502 @@ class Core(commands.Cog, CoreLogic):
             )
         )
 
+    @commands.group(cls=commands.commands._AlwaysAvailableGroup)
+    async def mydata(self, ctx: commands.Context):
+        """ Commands which interact with the data [botname] has about you """
+
+    # 1/10 minutes. It's a static response, but the inability to lock
+    # will annoy people if it's spammable
+    @commands.cooldown(1, 600, commands.BucketType.user)
+    @mydata.command(cls=commands.commands._AlwaysAvailableCommand, name="whatdata")
+    async def mydata_whatdata(self, ctx: commands.Context):
+        """ Find out what type of data [botname] stores and why """
+
+        ver = "latest" if red_version_info.dev_release else "stable"
+        link = f"https://docs.discord.red/en/{ver}/red_core_data_statement.html"
+        await ctx.send(
+            _(
+                "This bot stores some data about users as necessary to function. "
+                "This is mostly the ID your user is assigned by Discord, linked to "
+                "a handful of things depending on what you interact with in the bot. "
+                "There are a few commands which store it to keep track of who created "
+                "something. (such as playlists) "
+                "For full details about this as well as more in depth details of what "
+                "is stored and why, see {link}.\n\n"
+                "Additionally, 3rd party addons loaded by the bot's owner may or "
+                "may not store additional things. "
+                "You can use `{prefix}mydata 3rdparty` "
+                "to view the statements provided by each 3rd-party addition."
+            ).format(link=link, prefix=ctx.clean_prefix)
+        )
+
+    # 1/30 minutes. It's not likely to change much and uploads a standalone webpage.
+    @commands.cooldown(1, 1800, commands.BucketType.user)
+    @mydata.command(cls=commands.commands._AlwaysAvailableCommand, name="3rdparty")
+    async def mydata_3rd_party(self, ctx: commands.Context):
+        """ View the End User Data statements of each 3rd-party module. """
+
+        # Can't check this as a command check, and want to prompt DMs as an option.
+        if not ctx.channel.permissions_for(ctx.me).attach_files:
+            ctx.command.reset_cooldown(ctx)
+            return await ctx.send(_("I need to be able to attach files (try in DMs?)"))
+
+        statements = {
+            ext_name: getattr(ext, "__red_end_user_data_statement__", None)
+            for ext_name, ext in ctx.bot.extensions.items()
+            if not (ext.__package__ and ext.__package__.startswith("redbot."))
+        }
+
+        if not statements:
+            return await ctx.send(
+                _("This instance does not appear to have any 3rd-party extensions loaded.")
+            )
+
+        parts = []
+
+        formatted_statements = []
+
+        no_statements = []
+
+        for ext_name, statement in sorted(statements.items()):
+            if not statement:
+                no_statements.append(ext_name)
+            else:
+                formatted_statements.append(
+                    f"### {entity_transformer(ext_name)}\n\n{entity_transformer(statement)}"
+                )
+
+        if formatted_statements:
+            parts.append(
+                "## "
+                + _("3rd party End User Data statements")
+                + "\n\n"
+                + _("The following are statements provided by 3rd-party extensions.")
+            )
+            parts.extend(formatted_statements)
+
+        if no_statements:
+            parts.append("## " + _("3rd-party extensions without statements\n"))
+            for ext in no_statements:
+                parts.append(f"\n - {entity_transformer(ext)}")
+
+        generated = markdown.markdown("\n".join(parts), output_format="html")
+
+        html = "\n".join((PRETTY_HTML_HEAD, generated, HTML_CLOSING))
+
+        fp = io.BytesIO(html.encode())
+
+        await ctx.send(
+            _("Here's a generated page with the statements provided by 3rd-party extensions"),
+            file=discord.File(fp, filename="3rd-party.html"),
+        )
+
+    async def get_serious_confirmation(self, ctx: commands.Context, prompt: str) -> bool:
+
+        confirm_token = "".join(random.choices((*ascii_letters, *digits), k=8))
+
+        await ctx.send(f"{prompt}\n\n{confirm_token}")
+        try:
+            message = await ctx.bot.wait_for(
+                "message",
+                check=lambda m: m.channel.id == ctx.channel.id and m.author.id == ctx.author.id,
+                timeout=30,
+            )
+        except asyncio.TimeoutError:
+            await ctx.send(_("Did not get confirmation, cancelling."))
+        else:
+            if message.content.strip() == confirm_token:
+                return True
+            else:
+                await ctx.send(_("Did not get a matching confirmation, cancelling."))
+
+        return False
+
+    # 1 per day, not stored to config to avoid this being more stored data.
+    # large bots shouldn't be restarting so often that this is an issue,
+    # and small bots that do restart often don't have enough
+    # users for this to be an issue.
+    @commands.cooldown(1, 86400, commands.BucketType.user)
+    @mydata.command(cls=commands.commands._ForgetMeSpecialCommand, name="forgetme")
+    async def mydata_forgetme(self, ctx: commands.Context):
+        """
+        Have [botname] forget what it knows about you.
+
+        This may not remove all data about you, data needed for operation,
+        such as command cooldowns will be kept until no longer necessary.
+
+        Further interactions with [botname] may cause it to learn about you again.
+        """
+        if ctx.assume_yes:
+            # lol, no, we're not letting users schedule deletions every day to thrash the bot.
+            ctx.command.reset_cooldown(ctx)  # We will however not let that lock them out either.
+            return await ctx.send(
+                _("This command ({command}) does not support non-interactive usage").format(
+                    command=ctx.command.qualified_name
+                )
+            )
+
+        if not await self.get_serious_confirmation(
+            ctx,
+            _(
+                "This will cause the bot to get rid of and/or disassociate "
+                "data from you. It will not get rid of operational data such "
+                "as modlog entries, warnings, or mutes. "
+                "If you are sure this is what you want, "
+                "please respond with the following:"
+            ),
+        ):
+            ctx.command.reset_cooldown(ctx)
+            return
+        await ctx.send(_("This may take some time"))
+
+        if await ctx.bot._config.datarequests.user_requests_are_strict():
+            requester = "user_strict"
+        else:
+            requester = "user"
+
+        results = await self.bot.handle_data_deletion_request(
+            requester=requester, user_id=ctx.author.id
+        )
+
+        if results.failed_cogs and results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about you "
+                    "(that I know how to delete) "
+                    "{mention}, however the following modules errored: {modules}. "
+                    "Additionally, the following cogs errored: {cogs}\n"
+                    "Please contact the owner of this bot to address this.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(
+                    mention=ctx.author.mention,
+                    cogs=humanize_list(results.failed_cogs),
+                    modules=humanize_list(results.failed_modules),
+                )
+            )
+        elif results.failed_cogs:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about you "
+                    "(that I know how to delete) "
+                    "{mention}, however the following cogs errored: {cogs}.\n"
+                    "Please contact the owner of this bot to address this.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(mention=ctx.author.mention, cogs=humanize_list(results.failed_cogs))
+            )
+        elif results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about you "
+                    "(that I know how to delete) "
+                    "{mention}, however the following modules errored: {modules}.\n"
+                    "Please contact the owner of this bot to address this.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(mention=ctx.author.mention, modules=humanize_list(results.failed_modules))
+            )
+        else:
+            await ctx.send(
+                _(
+                    "I've deleted any non-operational data about you "
+                    "(that I know how to delete) {mention}"
+                ).format(mention=ctx.author.mention)
+            )
+
+        if results.unhandled:
+            await ctx.send(
+                _("{mention} The following cogs did not handle deletion:\n{cogs}").format(
+                    mention=ctx.author.mention, cogs=humanize_list(results.unhandled)
+                )
+            )
+
+    # The cooldown of this should be longer once actually implemented
+    # This is a couple hours, and lets people occasionally check status, I guess.
+    @commands.cooldown(1, 7200, commands.BucketType.user)
+    @mydata.command(cls=commands.commands._AlwaysAvailableCommand, name="getmydata")
+    async def mydata_getdata(self, ctx: commands.Context):
+        """ [Coming Soon] Get what data [botname] has about you. """
+        await ctx.send(
+            _(
+                "This command doesn't do anything yet, "
+                "but we're working on adding support for this."
+            )
+        )
+
+    @checks.is_owner()
+    @mydata.group(name="ownermanagement")
+    async def mydata_owner_management(self, ctx: commands.Context):
+        """
+        Commands for more complete data handling.
+        """
+
+    @mydata_owner_management.command(name="allowuserdeletions")
+    async def mydata_owner_allow_user_deletions(self, ctx):
+        """
+        Set the bot to allow users to request a data deletion.
+
+        This is on by default.
+        """
+        await ctx.bot._config.datarequests.allow_user_requests.set(True)
+        await ctx.send(
+            _(
+                "User can delete their own data. "
+                "This will not include operational data such as blocked users."
+            )
+        )
+
+    @mydata_owner_management.command(name="disallowuserdeletions")
+    async def mydata_owner_disallow_user_deletions(self, ctx):
+        """
+        Set the bot to not allow users to request a data deletion.
+        """
+        await ctx.bot._config.datarequests.allow_user_requests.set(False)
+        await ctx.send(_("User can not delete their own data."))
+
+    @mydata_owner_management.command(name="setuserdeletionlevel")
+    async def mydata_owner_user_deletion_level(self, ctx, level: int):
+        """
+        Sets how user deletions are treated.
+
+        Level:
+            0: What users can delete is left entirely up to each cog.
+            1: Cogs should delete anything the cog doesn't need about the user.
+        """
+
+        if level == 1:
+            await ctx.bot._config.datarequests.user_requests_are_strict.set(True)
+            await ctx.send(
+                _(
+                    "Cogs will be instructed to remove all non operational "
+                    "data upon a user request."
+                )
+            )
+        elif level == 0:
+            await ctx.bot._config.datarequests.user_requests_are_strict.set(False)
+            await ctx.send(
+                _(
+                    "Cogs will be informed a user has made a data deletion request, "
+                    "and the details of what to delete will be left to the "
+                    "discretion of the cog author."
+                )
+            )
+        else:
+            await ctx.send_help()
+
+    @mydata_owner_management.command(name="processdiscordrequest")
+    async def mydata_discord_deletion_request(self, ctx, user_id: int):
+        """
+        Handle a deletion request from discord.
+        """
+
+        if not await self.get_serious_confirmation(
+            ctx,
+            _(
+                "This will cause the bot to get rid of or disassociate all data "
+                "from the specified user ID. You should not use this unless "
+                "Discord has specifically requested this with regard to a deleted user. "
+                "This will remove the user from various anti-abuse measures. "
+                "If you are processing a manual request from a user, you may want "
+                "`{prefix}{command_name}` instead"
+                "\n\nIf you are sure this is what you intend to do "
+                "please respond with the following:"
+            ).format(prefix=ctx.clean_prefix, command_name="mydata ownermanagement deleteforuser"),
+        ):
+            return
+        results = await self.bot.handle_data_deletion_request(
+            requester="discord_deleted_user", user_id=user_id
+        )
+
+        if results.failed_cogs and results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}. "
+                    "Additionally, the following cogs errored: {cogs}\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(
+                    cogs=humanize_list(results.failed_cogs),
+                    modules=humanize_list(results.failed_modules),
+                )
+            )
+        elif results.failed_cogs:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following cogs errored: {cogs}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(cogs=humanize_list(results.failed_cogs))
+            )
+        elif results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(modules=humanize_list(results.failed_modules))
+            )
+        else:
+            await ctx.send(_("I've deleted all data about that user that I know how to delete."))
+
+        if results.unhandled:
+            await ctx.send(
+                _("{mention} The following cogs did not handle deletion:\n{cogs}").format(
+                    mention=ctx.author.mention, cogs=humanize_list(results.unhandled)
+                )
+            )
+
+    @mydata_owner_management.command(name="deleteforuser")
+    async def mydata_user_deletion_request_by_owner(self, ctx, user_id: int):
+        """ Delete data [botname] has about a user for a user. """
+        if not await self.get_serious_confirmation(
+            ctx,
+            _(
+                "This will cause the bot to get rid of or disassociate "
+                "a lot of non-operational data from the "
+                "specified user. Users have access to "
+                "different command for this unless they can't interact with the bot at all. "
+                "This is a mostly safe operation, but you should not use it "
+                "unless processing a request from this "
+                "user as it may impact their usage of the bot. "
+                "\n\nIf you are sure this is what you intend to do "
+                "please respond with the following:"
+            ),
+        ):
+            return
+
+        if await ctx.bot._config.datarequests.user_requests_are_strict():
+            requester = "user_strict"
+        else:
+            requester = "user"
+
+        results = await self.bot.handle_data_deletion_request(requester=requester, user_id=user_id)
+
+        if results.failed_cogs and results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}. "
+                    "Additionally, the following cogs errored: {cogs}\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(
+                    cogs=humanize_list(results.failed_cogs),
+                    modules=humanize_list(results.failed_modules),
+                )
+            )
+        elif results.failed_cogs:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about that user, "
+                    "(that I know how to delete) "
+                    "however the following cogs errored: {cogs}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(cogs=humanize_list(results.failed_cogs))
+            )
+        elif results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all non-operational data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(modules=humanize_list(results.failed_modules))
+            )
+        else:
+            await ctx.send(
+                _(
+                    "I've deleted all non-operational data about that user "
+                    "that I know how to delete."
+                )
+            )
+
+        if results.unhandled:
+            await ctx.send(
+                _("{mention} The following cogs did not handle deletion:\n{cogs}").format(
+                    mention=ctx.author.mention, cogs=humanize_list(results.unhandled)
+                )
+            )
+
+    @mydata_owner_management.command(name="deleteuserasowner")
+    async def mydata_user_deletion_by_owner(self, ctx, user_id: int):
+        """ Delete data [botname] has about a user. """
+        if not await self.get_serious_confirmation(
+            ctx,
+            _(
+                "This will cause the bot to get rid of or disassociate "
+                "a lot of data about the specified user. "
+                "This may include more than just end user data, including "
+                "anti abuse records."
+                "\n\nIf you are sure this is what you intend to do "
+                "please respond with the following:"
+            ),
+        ):
+            return
+        results = await self.bot.handle_data_deletion_request(requester="owner", user_id=user_id)
+
+        if results.failed_cogs and results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}. "
+                    "Additionally, the following cogs errored: {cogs}\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(
+                    cogs=humanize_list(results.failed_cogs),
+                    modules=humanize_list(results.failed_modules),
+                )
+            )
+        elif results.failed_cogs:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following cogs errored: {cogs}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(cogs=humanize_list(results.failed_cogs))
+            )
+        elif results.failed_modules:
+            await ctx.send(
+                _(
+                    "I tried to delete all data about that user, "
+                    "(that I know how to delete) "
+                    "however the following modules errored: {modules}.\n"
+                    "Please check your logs and contact the creators of "
+                    "these cogs and modules.\n"
+                    "Note: Outside of these failures, data should have been deleted."
+                ).format(modules=humanize_list(results.failed_modules))
+            )
+        else:
+            await ctx.send(
+                _("I've deleted all data about that user " "that I know how to delete.")
+            )
+
+        if results.unhandled:
+            await ctx.send(
+                _("{mention} The following cogs did not handle deletion:\n{cogs}").format(
+                    mention=ctx.author.mention, cogs=humanize_list(results.unhandled)
+                )
+            )
+
     @commands.group()
     async def embedset(self, ctx: commands.Context):
         """
@@ -2184,7 +2719,7 @@ class Core(commands.Cog, CoreLogic):
         cog = self.bot.get_cog(cogname)
         if not cog:
             return await ctx.send(_("Cog with the given name doesn't exist."))
-        if cog == self:
+        if isinstance(cog, commands.commands._RuleDropper):
             return await ctx.send(_("You can't disable this cog by default."))
         await self.bot._disabled_cog_cache.default_disable(cogname)
         await ctx.send(_("{cogname} has been set as disabled by default.").format(cogname=cogname))
@@ -2206,7 +2741,7 @@ class Core(commands.Cog, CoreLogic):
         cog = self.bot.get_cog(cogname)
         if not cog:
             return await ctx.send(_("Cog with the given name doesn't exist."))
-        if cog == self:
+        if isinstance(cog, commands.commands._RuleDropper):
             return await ctx.send(_("You can't disable this cog as you would lock yourself out."))
         if await self.bot._disabled_cog_cache.disable_cog_in_guild(cogname, ctx.guild.id):
             await ctx.send(_("{cogname} has been disabled in this guild.").format(cogname=cogname))
@@ -2328,7 +2863,7 @@ class Core(commands.Cog, CoreLogic):
             )
             return
 
-        if isinstance(command_obj, commands.commands._AlwaysAvailableCommand):
+        if isinstance(command_obj, commands.commands._RuleDropper):
             await ctx.send(
                 _("This command is designated as being always available and cannot be disabled.")
             )
@@ -2362,7 +2897,7 @@ class Core(commands.Cog, CoreLogic):
             )
             return
 
-        if isinstance(command_obj, commands.commands._AlwaysAvailableCommand):
+        if isinstance(command_obj, commands.commands._RuleDropper):
             await ctx.send(
                 _("This command is designated as being always available and cannot be disabled.")
             )
@@ -2748,6 +3283,28 @@ class Core(commands.Cog, CoreLogic):
         )
         return msg
 
+    # Removing this command from forks is a violation of the GPLv3 under which it is licensed.
+    # Otherwise interfering with the ability for this command to be accessible is also a violation.
+    @commands.command(
+        cls=commands.commands._AlwaysAvailableCommand,
+        name="licenseinfo",
+        aliases=["licenceinfo"],
+        i18n=_,
+    )
+    async def license_info_command(ctx):
+        """
+        Get info about Red's licenses.
+        """
+
+        message = (
+            "This bot is an instance of Red-DiscordBot (hereafter referred to as Red)\n"
+            "Red is a free and open source application made available to the public and "
+            "licensed under the GNU GPLv3. The full text of this license is available to you at "
+            "<https://github.com/Cog-Creators/Red-DiscordBot/blob/V3/develop/LICENSE>"
+        )
+        await ctx.send(message)
+        # We need a link which contains a thank you to other projects which we use at some point.
+
 
 # DEP-WARN: CooldownMapping should have a method `from_cooldown`
 # which accepts (number, number, bucket)
@@ -2764,30 +3321,7 @@ class LicenseCooldownMapping(commands.CooldownMapping):
         return (msg.channel.id, msg.author.id)
 
 
-# Removing this command from forks is a violation of the GPLv3 under which it is licensed.
-# Otherwise interfering with the ability for this command to be accessible is also a violation.
-@commands.command(
-    cls=commands.commands._AlwaysAvailableCommand,
-    name="licenseinfo",
-    aliases=["licenceinfo"],
-    i18n=_,
-)
-async def license_info_command(ctx):
-    """
-    Get info about Red's licenses.
-    """
-
-    message = (
-        "This bot is an instance of Red-DiscordBot (hereafter referred to as Red)\n"
-        "Red is a free and open source application made available to the public and "
-        "licensed under the GNU GPLv3. The full text of this license is available to you at "
-        "<https://github.com/Cog-Creators/Red-DiscordBot/blob/V3/develop/LICENSE>"
-    )
-    await ctx.send(message)
-    # We need a link which contains a thank you to other projects which we use at some point.
-
-
 # DEP-WARN: command objects should store a single cooldown mapping as `._buckets`
-license_info_command._buckets = LicenseCooldownMapping.from_cooldown(
+Core.license_info_command._buckets = LicenseCooldownMapping.from_cooldown(
     1, 180, commands.BucketType.member  # pick a random bucket,it wont get used.
 )

redbot/core/dev_commands.py

@@ -33,6 +33,13 @@ START_CODE_BLOCK_RE = re.compile(r"^((```py)(?=\s)|(```))")
 class Dev(commands.Cog):
     """Various development focused utilities."""
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """
+        Because despite my best efforts to advise otherwise,
+        people use ``--dev`` in production
+        """
+        return
+
     def __init__(self):
         super().__init__()
         self._last_result = None

redbot/core/modlog.py

@@ -3,12 +3,12 @@ from __future__ import annotations
 import asyncio
 import logging
 from datetime import datetime, timedelta
-from typing import List, Union, Optional, cast, TYPE_CHECKING
+from typing import List, Literal, Union, Optional, cast, TYPE_CHECKING
 
 import discord
 
 from redbot.core import Config
-
+from .utils import AsyncIter
 from .utils.common_filters import (
     filter_invites,
     filter_mass_mentions,
@@ -47,10 +47,41 @@ _CASETYPES = "CASETYPES"
 _CASES = "CASES"
 _SCHEMA_VERSION = 4
 
+_data_deletion_lock = asyncio.Lock()
 
 _ = Translator("ModLog", __file__)
 
 
+async def _process_data_deletion(
+    *, requester: Literal["discord_deleted_user", "owner", "user", "user_strict"], user_id: int
+):
+    if requester != "discord_deleted_user":
+        return
+
+    # Oh, how I wish it was as simple as I wanted...
+
+    key_paths = []
+
+    async with _data_deletion_lock:
+        all_cases = await _config.custom(_CASES).all()
+        async for guild_id_str, guild_cases in AsyncIter(all_cases.items(), steps=100):
+            async for case_num_str, case in AsyncIter(guild_cases.items(), steps=100):
+                for keyname in ("user", "moderator", "amended_by"):
+                    if (case.get(keyname, 0) or 0) == user_id:  # this could be None...
+                        key_paths.append((guild_id_str, case_num_str))
+
+        async with _config.custom(_CASES).all() as all_cases:
+            for guild_id_str, case_num_str in key_paths:
+                case = all_cases[guild_id_str][case_num_str]
+                if (case.get("user", 0) or 0) == user_id:
+                    case["user"] = 0xDE1
+                    case.pop("last_known_username", None)
+                if (case.get("moderator", 0) or 0) == user_id:
+                    case["moderator"] = 0xDE1
+                if (case.get("amended_by", 0) or 0) == user_id:
+                    case["amended_by"] = 0xDE1
+
+
 async def _init(bot: Red):
     global _config
     global _bot_ref
@@ -310,6 +341,9 @@ class Case:
             moderator = _("Unknown")
         elif isinstance(self.moderator, int):
             # can't use _() inside f-string expressions, see bpo-36310 and red#3818
+            if self.moderator == 0xDE1:
+                moderator = _("Deleted User.")
+            else:
                 translated = _("Unknown or Deleted User")
                 moderator = f"[{translated}] ({self.moderator})"
         else:
@@ -329,6 +363,9 @@ class Case:
             amended_by = None
         elif isinstance(self.amended_by, int):
             # can't use _() inside f-string expressions, see bpo-36310 and red#3818
+            if self.amended_by == 0xDE1:
+                amended_by = _("Deleted User.")
+            else:
                 translated = _("Unknown or Deleted User")
                 amended_by = f"[{translated}] ({self.amended_by})"
         else:
@@ -341,7 +378,9 @@ class Case:
             )
 
         if isinstance(self.user, int):
-            if self.last_known_username is None:
+            if self.user == 0xDE1:
+                user = _("Deleted User.")
+            elif self.last_known_username is None:
                 # can't use _() inside f-string expressions, see bpo-36310 and red#3818
                 translated = _("Unknown or Deleted User")
                 user = f"[{translated}] ({self.user})"

redbot/core/settings_caches.py

@@ -1,12 +1,14 @@
 from __future__ import annotations
 
 from typing import Dict, List, Optional, Union, Set, Iterable, Tuple
+import asyncio
 from argparse import Namespace
 from collections import defaultdict
 
 import discord
 
 from .config import Config
+from .utils import AsyncIter
 
 
 class PrefixManager:
@@ -125,12 +127,48 @@ class WhitelistBlacklistManager:
         self._config: Config = config
         self._cached_whitelist: Dict[Optional[int], Set[int]] = {}
         self._cached_blacklist: Dict[Optional[int], Set[int]] = {}
+        # because of discord deletion
+        # we now have sync and async access that may need to happen at the
+        # same time.
+        # blame discord for this.
+        self._access_lock = asyncio.Lock()
+
+    async def discord_deleted_user(self, user_id: int):
+
+        async with self._access_lock:
+
+            async for guild_id_or_none, ids in AsyncIter(
+                self._cached_whitelist.items(), steps=100
+            ):
+                ids.discard(user_id)
+
+            async for guild_id_or_none, ids in AsyncIter(
+                self._cached_blacklist.items(), steps=100
+            ):
+                ids.discard(user_id)
+
+            for grp in (self._config.whitelist, self._config.blacklist):
+                async with grp() as ul:
+                    try:
+                        ul.remove(user_id)
+                    except ValueError:
+                        pass
+
+            # don't use this in extensions, it's optimized and controlled for here,
+            # but can't be safe in 3rd party use
+
+            async with self._config._get_base_group("GUILD").all() as abuse:
+                for guild_str, guild_data in abuse.items():
+                    for l_name in ("whitelist", "blacklist"):
+                        try:
+                            guild_data[l_name].remove(user_id)
+                        except (ValueError, KeyError):
+                            pass  # this is raw access not filled with defaults
 
     async def get_whitelist(self, guild: Optional[discord.Guild] = None) -> Set[int]:
+        async with self._access_lock:
             ret: Set[int]
-
             gid: Optional[int] = guild.id if guild else None
-
             if gid in self._cached_whitelist:
                 ret = self._cached_whitelist[gid].copy()
             else:
@@ -144,6 +182,7 @@ class WhitelistBlacklistManager:
             return ret
 
     async def add_to_whitelist(self, guild: Optional[discord.Guild], role_or_user: Iterable[int]):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             role_or_user = role_or_user or []
             if not all(isinstance(r_or_u, int) for r_or_u in role_or_user):
@@ -161,9 +200,12 @@ class WhitelistBlacklistManager:
                         await self._config.guild_from_id(gid).whitelist()
                     )
                 self._cached_whitelist[gid].update(role_or_user)
-            await self._config.guild_from_id(gid).whitelist.set(list(self._cached_whitelist[gid]))
+                await self._config.guild_from_id(gid).whitelist.set(
+                    list(self._cached_whitelist[gid])
+                )
 
     async def clear_whitelist(self, guild: Optional[discord.Guild] = None):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             self._cached_whitelist[gid] = set()
             if gid is None:
@@ -174,6 +216,7 @@ class WhitelistBlacklistManager:
     async def remove_from_whitelist(
         self, guild: Optional[discord.Guild], role_or_user: Iterable[int]
     ):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             role_or_user = role_or_user or []
             if not all(isinstance(r_or_u, int) for r_or_u in role_or_user):
@@ -191,13 +234,14 @@ class WhitelistBlacklistManager:
                         await self._config.guild_from_id(gid).whitelist()
                     )
                 self._cached_whitelist[gid].difference_update(role_or_user)
-            await self._config.guild_from_id(gid).whitelist.set(list(self._cached_whitelist[gid]))
+                await self._config.guild_from_id(gid).whitelist.set(
+                    list(self._cached_whitelist[gid])
+                )
 
     async def get_blacklist(self, guild: Optional[discord.Guild] = None) -> Set[int]:
+        async with self._access_lock:
             ret: Set[int]
-
             gid: Optional[int] = guild.id if guild else None
-
             if gid in self._cached_blacklist:
                 ret = self._cached_blacklist[gid].copy()
             else:
@@ -211,6 +255,7 @@ class WhitelistBlacklistManager:
             return ret
 
     async def add_to_blacklist(self, guild: Optional[discord.Guild], role_or_user: Iterable[int]):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             role_or_user = role_or_user or []
             if not all(isinstance(r_or_u, int) for r_or_u in role_or_user):
@@ -226,9 +271,12 @@ class WhitelistBlacklistManager:
                         await self._config.guild_from_id(gid).blacklist()
                     )
                 self._cached_blacklist[gid].update(role_or_user)
-            await self._config.guild_from_id(gid).blacklist.set(list(self._cached_blacklist[gid]))
+                await self._config.guild_from_id(gid).blacklist.set(
+                    list(self._cached_blacklist[gid])
+                )
 
     async def clear_blacklist(self, guild: Optional[discord.Guild] = None):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             self._cached_blacklist[gid] = set()
             if gid is None:
@@ -239,6 +287,7 @@ class WhitelistBlacklistManager:
     async def remove_from_blacklist(
         self, guild: Optional[discord.Guild], role_or_user: Iterable[int]
     ):
+        async with self._access_lock:
             gid: Optional[int] = guild.id if guild else None
             role_or_user = role_or_user or []
             if not all(isinstance(r_or_u, int) for r_or_u in role_or_user):
@@ -254,7 +303,9 @@ class WhitelistBlacklistManager:
                         await self._config.guild_from_id(gid).blacklist()
                     )
                 self._cached_blacklist[gid].difference_update(role_or_user)
-            await self._config.guild_from_id(gid).blacklist.set(list(self._cached_blacklist[gid]))
+                await self._config.guild_from_id(gid).blacklist.set(
+                    list(self._cached_blacklist[gid])
+                )
 
 
 class DisabledCogCache:

setup.cfg

@@ -48,6 +48,7 @@ install_requires =
     distro==1.5.0; sys_platform == "linux"
     fuzzywuzzy==0.18.0
     idna==2.10
+    markdown==3.2.2
     multidict==4.7.6
     python-Levenshtein-wheels==0.13.1
     pytz==2020.1

tools/primary_deps.ini

@@ -17,6 +17,7 @@ install_requires =
     discord.py
     distro; sys_platform == "linux"
     fuzzywuzzy
+    markdown
     python-Levenshtein-wheels
     PyYAML
     Red-Lavalink