total rebaseHEADmaster

32 files changed, 512 insertions, 38 deletions

diff --git a/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex b/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
index 88f6ca0..88f6ca0 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex b/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
index 97d75ec..df4ba81 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
@@ -56,8 +56,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicy do
     nick_score + name_score + actor_type_score
   end
 
-  defp determine_if_followbot(_), do: 0.0
-
   defp bot_allowed?(%{"object" => target}, bot_actor) do
     %User{} = user = normalize_by_ap_id(target)
 
diff --git a/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex b/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
index 3ec9c52..3ec9c52 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/drop_policy.ex b/lib/pleroma/web/activity_pub/mrf/drop_policy.ex
index ad09368..ad09368 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/drop_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/drop_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex b/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex
new file mode 100644
index 0000000..f884962
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex
@@ -0,0 +1,281 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.EmojiPolicy do
+  require Pleroma.Constants
+
+  alias Pleroma.Object.Updater
+  alias Pleroma.Web.ActivityPub.MRF.Utils
+
+  @moduledoc "Reject or force-unlisted emojis with certain URLs or names"
+
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  defp config_remove_url do
+    Pleroma.Config.get([:mrf_emoji, :remove_url], [])
+  end
+
+  defp config_remove_shortcode do
+    Pleroma.Config.get([:mrf_emoji, :remove_shortcode], [])
+  end
+
+  defp config_unlist_url do
+    Pleroma.Config.get([:mrf_emoji, :federated_timeline_removal_url], [])
+  end
+
+  defp config_unlist_shortcode do
+    Pleroma.Config.get([:mrf_emoji, :federated_timeline_removal_shortcode], [])
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def history_awareness, do: :manual
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(%{"type" => type, "object" => %{"type" => objtype} = object} = message)
+      when type in ["Create", "Update"] and objtype in Pleroma.Constants.status_object_types() do
+    with {:ok, object} <-
+           Updater.do_with_history(object, fn object ->
+             {:ok, process_remove(object, :url, config_remove_url())}
+           end),
+         {:ok, object} <-
+           Updater.do_with_history(object, fn object ->
+             {:ok, process_remove(object, :shortcode, config_remove_shortcode())}
+           end),
+         activity <- Map.put(message, "object", object),
+         activity <- maybe_delist(activity) do
+      {:ok, activity}
+    end
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(%{"type" => type} = object) when type in Pleroma.Constants.actor_types() do
+    with object <- process_remove(object, :url, config_remove_url()),
+         object <- process_remove(object, :shortcode, config_remove_shortcode()) do
+      {:ok, object}
+    end
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(%{"type" => "EmojiReact"} = object) do
+    with {:ok, _} <-
+           matched_emoji_checker(config_remove_url(), config_remove_shortcode()).(object) do
+      {:ok, object}
+    else
+      _ ->
+        {:reject, "[EmojiPolicy] Rejected for having disallowed emoji"}
+    end
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(message) do
+    {:ok, message}
+  end
+
+  defp match_string?(string, pattern) when is_binary(pattern) do
+    string == pattern
+  end
+
+  defp match_string?(string, %Regex{} = pattern) do
+    String.match?(string, pattern)
+  end
+
+  defp match_any?(string, patterns) do
+    Enum.any?(patterns, &match_string?(string, &1))
+  end
+
+  defp url_from_tag(%{"icon" => %{"url" => url}}), do: url
+  defp url_from_tag(_), do: nil
+
+  defp url_from_emoji({_name, url}), do: url
+
+  defp shortcode_from_tag(%{"name" => name}) when is_binary(name), do: String.trim(name, ":")
+  defp shortcode_from_tag(_), do: nil
+
+  defp shortcode_from_emoji({name, _url}), do: name
+
+  defp process_remove(object, :url, patterns) do
+    process_remove_impl(object, &url_from_tag/1, &url_from_emoji/1, patterns)
+  end
+
+  defp process_remove(object, :shortcode, patterns) do
+    process_remove_impl(object, &shortcode_from_tag/1, &shortcode_from_emoji/1, patterns)
+  end
+
+  defp process_remove_impl(object, extract_from_tag, extract_from_emoji, patterns) do
+    object =
+      if object["tag"] do
+        Map.put(
+          object,
+          "tag",
+          Enum.filter(
+            object["tag"],
+            fn
+              %{"type" => "Emoji"} = tag ->
+                str = extract_from_tag.(tag)
+
+                if is_binary(str) do
+                  not match_any?(str, patterns)
+                else
+                  true
+                end
+
+              _ ->
+                true
+            end
+          )
+        )
+      else
+        object
+      end
+
+    object =
+      if object["emoji"] do
+        Map.put(
+          object,
+          "emoji",
+          object["emoji"]
+          |> Enum.reduce(%{}, fn {name, url} = emoji, acc ->
+            if not match_any?(extract_from_emoji.(emoji), patterns) do
+              Map.put(acc, name, url)
+            else
+              acc
+            end
+          end)
+        )
+      else
+        object
+      end
+
+    object
+  end
+
+  defp matched_emoji_checker(urls, shortcodes) do
+    fn object ->
+      if any_emoji_match?(object, &url_from_tag/1, &url_from_emoji/1, urls) or
+           any_emoji_match?(
+             object,
+             &shortcode_from_tag/1,
+             &shortcode_from_emoji/1,
+             shortcodes
+           ) do
+        {:matched, nil}
+      else
+        {:ok, %{}}
+      end
+    end
+  end
+
+  defp maybe_delist(%{"object" => object, "to" => to, "type" => "Create"} = activity) do
+    check = matched_emoji_checker(config_unlist_url(), config_unlist_shortcode())
+
+    should_delist? = fn object ->
+      with {:ok, _} <- Pleroma.Object.Updater.do_with_history(object, check) do
+        false
+      else
+        _ -> true
+      end
+    end
+
+    if Pleroma.Constants.as_public() in to and should_delist?.(object) do
+      to = List.delete(to, Pleroma.Constants.as_public())
+      cc = [Pleroma.Constants.as_public() | activity["cc"] || []]
+
+      activity
+      |> Map.put("to", to)
+      |> Map.put("cc", cc)
+    else
+      activity
+    end
+  end
+
+  defp maybe_delist(activity), do: activity
+
+  defp any_emoji_match?(object, extract_from_tag, extract_from_emoji, patterns) do
+    Kernel.||(
+      Enum.any?(
+        object["tag"] || [],
+        fn
+          %{"type" => "Emoji"} = tag ->
+            str = extract_from_tag.(tag)
+
+            if is_binary(str) do
+              match_any?(str, patterns)
+            else
+              false
+            end
+
+          _ ->
+            false
+        end
+      ),
+      (object["emoji"] || [])
+      |> Enum.any?(fn emoji -> match_any?(extract_from_emoji.(emoji), patterns) end)
+    )
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def describe do
+    mrf_emoji =
+      Pleroma.Config.get(:mrf_emoji, [])
+      |> Enum.map(fn {key, value} ->
+        {key, Enum.map(value, &Utils.describe_regex_or_string/1)}
+      end)
+      |> Enum.into(%{})
+
+    {:ok, %{mrf_emoji: mrf_emoji}}
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def config_description do
+    %{
+      key: :mrf_emoji,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.EmojiPolicy",
+      label: "MRF Emoji",
+      description:
+        "Reject or force-unlisted emojis whose URLs or names match a keyword or [Regex](https://hexdocs.pm/elixir/Regex.html).",
+      children: [
+        %{
+          key: :remove_url,
+          type: {:list, :string},
+          description: """
+            A list of patterns which result in emoji whose URL matches being removed from the message. This will apply to statuses, emoji reactions, and user profiles.
+
+            Each pattern can be a string or [Regex](https://hexdocs.pm/elixir/Regex.html) in the format of `~r/PATTERN/`.
+          """,
+          suggestions: ["https://example.org/foo.png", ~r/example.org\/foo/iu]
+        },
+        %{
+          key: :remove_shortcode,
+          type: {:list, :string},
+          description: """
+            A list of patterns which result in emoji whose shortcode matches being removed from the message. This will apply to statuses, emoji reactions, and user profiles.
+
+            Each pattern can be a string or [Regex](https://hexdocs.pm/elixir/Regex.html) in the format of `~r/PATTERN/`.
+          """,
+          suggestions: ["foo", ~r/foo/iu]
+        },
+        %{
+          key: :federated_timeline_removal_url,
+          type: {:list, :string},
+          description: """
+            A list of patterns which result in message with emojis whose URLs match being removed from federated timelines (a.k.a unlisted). This will apply only to statuses.
+
+            Each pattern can be a string or [Regex](https://hexdocs.pm/elixir/Regex.html) in the format of `~r/PATTERN/`.
+          """,
+          suggestions: ["https://example.org/foo.png", ~r/example.org\/foo/iu]
+        },
+        %{
+          key: :federated_timeline_removal_shortcode,
+          type: {:list, :string},
+          description: """
+            A list of patterns which result in message with emojis whose shortcodes match being removed from federated timelines (a.k.a unlisted). This will apply only to statuses.
+
+            Each pattern can be a string or [Regex](https://hexdocs.pm/elixir/Regex.html) in the format of `~r/PATTERN/`.
+          """,
+          suggestions: ["foo", ~r/foo/iu]
+        }
+      ]
+    }
+  end
+end
diff --git a/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex b/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
index a148cc1..a148cc1 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
+++ b/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/follow_bot_policy.ex b/lib/pleroma/web/activity_pub/mrf/follow_bot_policy.ex
index 5b6adbb..5a4a976 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/follow_bot_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/follow_bot_policy.ex
@@ -19,7 +19,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.FollowBotPolicy do
       try_follow(follower, message)
     else
       nil ->
-        Logger.warn(
+        Logger.warning(
           "#{__MODULE__} skipped because of missing `:mrf_follow_bot, :follower_nickname` configuration, the :follower_nickname
             account does not exist, or the account is not correctly configured as a bot."
         )
diff --git a/lib/pleroma/web/activity_pub/mrf/force_bot_unlisted_policy.ex b/lib/pleroma/web/activity_pub/mrf/force_bot_unlisted_policy.ex
index 8cec8ea..8cec8ea 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/force_bot_unlisted_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/force_bot_unlisted_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/force_mention.ex b/lib/pleroma/web/activity_pub/mrf/force_mention.ex
new file mode 100644
index 0000000..3853489
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/force_mention.ex
@@ -0,0 +1,59 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2024 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.ForceMention do
+  require Pleroma.Constants
+
+  alias Pleroma.Config
+  alias Pleroma.Object
+  alias Pleroma.User
+
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  defp get_author(url) do
+    with %Object{data: %{"actor" => actor}} <- Object.normalize(url, fetch: false),
+         %User{ap_id: ap_id, nickname: nickname} <- User.get_cached_by_ap_id(actor) do
+      %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
+    else
+      _ -> nil
+    end
+  end
+
+  defp prepend_author(tags, _, false), do: tags
+
+  defp prepend_author(tags, nil, _), do: tags
+
+  defp prepend_author(tags, url, _) do
+    actor = get_author(url)
+
+    if not is_nil(actor) do
+      [actor | tags]
+    else
+      tags
+    end
+  end
+
+  @impl true
+  def filter(%{"type" => "Create", "object" => %{"tag" => tag} = object} = activity) do
+    tag =
+      tag
+      |> prepend_author(
+        object["inReplyTo"],
+        Config.get([:mrf_force_mention, :mention_parent, true])
+      )
+      |> prepend_author(
+        object["quoteUrl"],
+        Config.get([:mrf_force_mention, :mention_quoted, true])
+      )
+      |> Enum.uniq()
+
+    {:ok, put_in(activity["object"]["tag"], tag)}
+  end
+
+  @impl true
+  def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe, do: {:ok, %{}}
+end
diff --git a/lib/pleroma/web/activity_pub/mrf/force_mentions_in_content.ex b/lib/pleroma/web/activity_pub/mrf/force_mentions_in_content.ex
index 7022456..5532093 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/force_mentions_in_content.ex
+++ b/lib/pleroma/web/activity_pub/mrf/force_mentions_in_content.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.ForceMentionsInContent do
@@ -95,11 +95,13 @@ defmodule Pleroma.Web.ActivityPub.MRF.ForceMentionsInContent do
       |> Enum.reject(&is_nil/1)
       |> sort_replied_user(replied_to_user)
 
-    explicitly_mentioned_uris = extract_mention_uris_from_content(content)
+    explicitly_mentioned_uris =
+      extract_mention_uris_from_content(content)
+      |> MapSet.new()
 
     added_mentions =
-      Enum.reduce(mention_users, "", fn %User{ap_id: uri} = user, acc ->
-        unless uri in explicitly_mentioned_uris do
+      Enum.reduce(mention_users, "", fn %User{ap_id: ap_id, uri: uri} = user, acc ->
+        if MapSet.disjoint?(MapSet.new([ap_id, uri]), explicitly_mentioned_uris) do
           acc <> Formatter.mention_from_user(user, %{mentions_format: :compact}) <> " "
         else
           acc
diff --git a/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex b/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
index b73fd97..fdb9a9d 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
@@ -9,7 +9,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.HashtagPolicy do
   alias Pleroma.Object
 
   @moduledoc """
-  Reject, TWKN-remove or Set-Sensitive messsages with specific hashtags (without the leading #)
+  Reject, TWKN-remove or Set-Sensitive messages with specific hashtags (without the leading #)
 
   Note: This MRF Policy is always enabled, if you want to disable it you have to set empty lists.
   """
@@ -84,7 +84,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.HashtagPolicy do
     if hashtags != [] do
       with {:ok, message} <- check_reject(message, hashtags),
            {:ok, message} <-
-             (if "type" == "Create" do
+             (if type == "Create" do
                 check_ftl_removal(message, hashtags)
               else
                 {:ok, message}
diff --git a/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex b/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
index 80e235d..80e235d 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/inline_quote_policy.ex b/lib/pleroma/web/activity_pub/mrf/inline_quote_policy.ex
new file mode 100644
index 0000000..b7a01c2
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/inline_quote_policy.ex
@@ -0,0 +1,77 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy do
+  @moduledoc "Force a quote line into the message content."
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  defp build_inline_quote(template, url) do
+    quote_line = String.replace(template, "{url}", "<a href=\"#{url}\">#{url}</a>")
+
+    "<span class=\"quote-inline\"><br/><br/>#{quote_line}</span>"
+  end
+
+  defp has_inline_quote?(content, quote_url) do
+    cond do
+      # Does the quote URL exist in the content?
+      content =~ quote_url -> true
+      # Does the content already have a .quote-inline span?
+      content =~ "<span class=\"quote-inline\">" -> true
+      # No inline quote found
+      true -> false
+    end
+  end
+
+  defp filter_object(%{"quoteUrl" => quote_url} = object) do
+    content = object["content"] || ""
+
+    if has_inline_quote?(content, quote_url) do
+      object
+    else
+      template = Pleroma.Config.get([:mrf_inline_quote, :template])
+
+      content =
+        if String.ends_with?(content, "</p>"),
+          do:
+            String.trim_trailing(content, "</p>") <>
+              build_inline_quote(template, quote_url) <> "</p>",
+          else: content <> build_inline_quote(template, quote_url)
+
+      Map.put(object, "content", content)
+    end
+  end
+
+  @impl true
+  def filter(%{"object" => %{"quoteUrl" => _} = object} = activity) do
+    {:ok, Map.put(activity, "object", filter_object(object))}
+  end
+
+  @impl true
+  def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe, do: {:ok, %{}}
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def history_awareness, do: :auto
+
+  @impl true
+  def config_description do
+    %{
+      key: :mrf_inline_quote,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy",
+      label: "MRF Inline Quote Policy",
+      description: "Force quote url to appear in post content.",
+      children: [
+        %{
+          key: :template,
+          type: :string,
+          description:
+            "The template to append to the post. `{url}` will be replaced with the actual link to the quoted post.",
+          suggestions: ["<bdi>RT:</bdi> {url}"]
+        }
+      ]
+    }
+  end
+end
diff --git a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
index 687ec6c..729da4e 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
@@ -5,18 +5,17 @@
 defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
   require Pleroma.Constants
 
+  alias Pleroma.Web.ActivityPub.MRF.Utils
+
   @moduledoc "Reject or Word-Replace messages with a keyword or regex"
 
   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
-  defp string_matches?(string, _) when not is_binary(string) do
-    false
-  end
 
   defp string_matches?(string, pattern) when is_binary(pattern) do
     String.contains?(string, pattern)
   end
 
-  defp string_matches?(string, pattern) do
+  defp string_matches?(string, %Regex{} = pattern) do
     String.match?(string, pattern)
   end
 
@@ -128,7 +127,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
 
   @impl true
   def describe do
-    # This horror is needed to convert regex sigils to strings
     mrf_keyword =
       Pleroma.Config.get(:mrf_keyword, [])
       |> Enum.map(fn {key, value} ->
@@ -136,21 +134,12 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
          Enum.map(value, fn
            {pattern, replacement} ->
              %{
-               "pattern" =>
-                 if not is_binary(pattern) do
-                   inspect(pattern)
-                 else
-                   pattern
-                 end,
+               "pattern" => Utils.describe_regex_or_string(pattern),
                "replacement" => replacement
              }
 
            pattern ->
-             if not is_binary(pattern) do
-               inspect(pattern)
-             else
-               pattern
-             end
+             Utils.describe_regex_or_string(pattern)
          end)}
       end)
       |> Enum.into(%{})
diff --git a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
index c95d35b..c95d35b 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/mention_policy.ex b/lib/pleroma/web/activity_pub/mrf/mention_policy.ex
index 8aa4f34..8aa4f34 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/mention_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/mention_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
index 855cda3..12bf4dd 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
@@ -10,9 +10,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy do
 
   @impl true
   def filter(%{"actor" => actor} = object) do
-    with true <- is_local?(actor),
-         true <- is_eligible_type?(object),
-         true <- is_note?(object),
+    with true <- local?(actor),
+         true <- eligible_type?(object),
+         true <- note?(object),
          false <- has_attachment?(object),
          true <- only_mentions?(object) do
       {:reject, "[NoEmptyPolicy]"}
@@ -24,7 +24,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy do
 
   def filter(object), do: {:ok, object}
 
-  defp is_local?(actor) do
+  defp local?(actor) do
     if actor |> String.starts_with?("#{Endpoint.url()}") do
       true
     else
@@ -59,11 +59,11 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy do
 
   defp only_mentions?(_), do: false
 
-  defp is_note?(%{"object" => %{"type" => "Note"}}), do: true
-  defp is_note?(_), do: false
+  defp note?(%{"object" => %{"type" => "Note"}}), do: true
+  defp note?(_), do: false
 
-  defp is_eligible_type?(%{"type" => type}) when type in ["Create", "Update"], do: true
-  defp is_eligible_type?(_), do: false
+  defp eligible_type?(%{"type" => type}) when type in ["Create", "Update"], do: true
+  defp eligible_type?(_), do: false
 
   @impl true
   def describe, do: {:ok, %{}}
diff --git a/lib/pleroma/web/activity_pub/mrf/no_op_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_op_policy.ex
index 8840c4f..8840c4f 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/no_op_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_op_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
index f81e9e5..f81e9e5 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex b/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
index 2dfc9a9..2dfc9a9 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
+++ b/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex b/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
index df1a6dc..df1a6dc 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/pipeline_filtering.ex b/lib/pleroma/web/activity_pub/mrf/pipeline_filtering.ex
index b2477fe..b2477fe 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/pipeline_filtering.ex
+++ b/lib/pleroma/web/activity_pub/mrf/pipeline_filtering.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/policy.ex b/lib/pleroma/web/activity_pub/mrf/policy.ex
index 0234de4..1f34883 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/policy.ex
@@ -3,8 +3,8 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.Policy do
-  @callback filter(Map.t()) :: {:ok | :reject, Map.t()}
-  @callback describe() :: {:ok | :error, Map.t()}
+  @callback filter(map()) :: {:ok | :reject, map()}
+  @callback describe() :: {:ok | :error, map()}
   @callback config_description() :: %{
               optional(:children) => [map()],
               key: atom(),
diff --git a/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex b/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex
new file mode 100644
index 0000000..ac353f0
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex
@@ -0,0 +1,49 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.QuoteToLinkTagPolicy do
+  @moduledoc "Force a Link tag for posts quoting another post. (may break outgoing federation of quote posts with older Pleroma versions)"
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
+
+  require Pleroma.Constants
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(%{"object" => %{"quoteUrl" => _} = object} = activity) do
+    {:ok, Map.put(activity, "object", filter_object(object))}
+  end
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def filter(object), do: {:ok, object}
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def describe, do: {:ok, %{}}
+
+  @impl Pleroma.Web.ActivityPub.MRF.Policy
+  def history_awareness, do: :auto
+
+  defp filter_object(%{"quoteUrl" => quote_url} = object) do
+    tags = object["tag"] || []
+
+    if Enum.any?(tags, fn tag ->
+         CommonFixes.object_link_tag?(tag) and tag["href"] == quote_url
+       end) do
+      object
+    else
+      object
+      |> Map.put(
+        "tag",
+        tags ++
+          [
+            %{
+              "type" => "Link",
+              "mediaType" => Pleroma.Constants.activity_json_canonical_mime_type(),
+              "href" => quote_url
+            }
+          ]
+      )
+    end
+  end
+end
diff --git a/lib/pleroma/web/activity_pub/mrf/reject_non_public.ex b/lib/pleroma/web/activity_pub/mrf/reject_non_public.ex
index 9d4a7a4..9d4a7a4 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/reject_non_public.ex
+++ b/lib/pleroma/web/activity_pub/mrf/reject_non_public.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
index 829ddea..829ddea 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex b/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
index f66c379..fa6b595 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
@@ -34,14 +34,17 @@ defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicy do
           |> Path.basename()
           |> Path.extname()
 
-        file_path = Path.join(emoji_dir_path, shortcode <> (extension || ".png"))
+        extension = if extension == "", do: ".png", else: extension
+
+        shortcode = Path.basename(shortcode)
+        file_path = Path.join(emoji_dir_path, shortcode <> extension)
 
         case File.write(file_path, response.body) do
           :ok ->
             shortcode
 
           e ->
-            Logger.warn("MRF.StealEmojiPolicy: Failed to write to #{file_path}: #{inspect(e)}")
+            Logger.warning("MRF.StealEmojiPolicy: Failed to write to #{file_path}: #{inspect(e)}")
             nil
         end
       else
@@ -53,7 +56,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicy do
       end
     else
       e ->
-        Logger.warn("MRF.StealEmojiPolicy: Failed to fetch #{url}: #{inspect(e)}")
+        Logger.warning("MRF.StealEmojiPolicy: Failed to fetch #{url}: #{inspect(e)}")
         nil
     end
   end
@@ -76,6 +79,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicy do
       new_emojis =
         foreign_emojis
         |> Enum.reject(fn {shortcode, _url} -> shortcode in installed_emoji end)
+        |> Enum.reject(fn {shortcode, _url} -> String.contains?(shortcode, ["/", "\\"]) end)
         |> Enum.filter(fn {shortcode, _url} ->
           reject_emoji? =
             [:mrf_steal_emoji, :rejected_shortcodes]
diff --git a/lib/pleroma/web/activity_pub/mrf/subchain_policy.ex b/lib/pleroma/web/activity_pub/mrf/subchain_policy.ex
index fdb9e51..fdb9e51 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/subchain_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/subchain_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex b/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
index 73760ca..73760ca 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/user_allow_list_policy.ex b/lib/pleroma/web/activity_pub/mrf/user_allow_list_policy.ex
index e14047d..e14047d 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/user_allow_list_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/user_allow_list_policy.ex
diff --git a/lib/pleroma/web/activity_pub/mrf/utils.ex b/lib/pleroma/web/activity_pub/mrf/utils.ex
new file mode 100644
index 0000000..f2dc9ee
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/utils.ex
@@ -0,0 +1,15 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.Utils do
+  @spec describe_regex_or_string(String.t() | Regex.t()) :: String.t()
+  def describe_regex_or_string(pattern) do
+    # This horror is needed to convert regex sigils to strings
+    if not is_binary(pattern) do
+      inspect(pattern)
+    else
+      pattern
+    end
+  end
+end
diff --git a/lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex b/lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex
index d9deff3..d9deff3 100755..100644
--- a/lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex