Add safe dm mode option.

lib/pleroma/formatter.ex

@@ -8,6 +8,7 @@ defmodule Pleroma.Formatter do
   alias Pleroma.User
   alias Pleroma.Web.MediaProxy
 
+  @safe_mention_regex ~r/^(\s*(?<mentions>@.+?\s+)+)(?<rest>.*)/
   @markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
   @link_regex ~r{((?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+)|[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+}ui
   # credo:disable-for-previous-line Credo.Check.Readability.MaxLineLength
@@ -45,15 +46,28 @@ defmodule Pleroma.Formatter do
 
   @doc """
   Parses a text and replace plain text links with HTML. Returns a tuple with a result text, mentions, and hashtags.
+
+  If the 'safe_mention' option is given, only consecutive mentions at the start the post are actually mentioned.
   """
   @spec linkify(String.t(), keyword()) ::
           {String.t(), [{String.t(), User.t()}], [{String.t(), String.t()}]}
   def linkify(text, options \\ []) do
     options = options ++ @auto_linker_config
-    acc = %{mentions: MapSet.new(), tags: MapSet.new()}
-    {text, %{mentions: mentions, tags: tags}} = AutoLinker.link_map(text, acc, options)
 
-    {text, MapSet.to_list(mentions), MapSet.to_list(tags)}
+    if options[:safe_mention] && Regex.named_captures(@safe_mention_regex, text) do
+      %{"mentions" => mentions, "rest" => rest} = Regex.named_captures(@safe_mention_regex, text)
+      acc = %{mentions: MapSet.new(), tags: MapSet.new()}
+
+      {text_mentions, %{mentions: mentions}} = AutoLinker.link_map(mentions, acc, options)
+      {text_rest, %{tags: tags}} = AutoLinker.link_map(rest, acc, options)
+
+      {text_mentions <> text_rest, MapSet.to_list(mentions), MapSet.to_list(tags)}
+    else
+      acc = %{mentions: MapSet.new(), tags: MapSet.new()}
+      {text, %{mentions: mentions, tags: tags}} = AutoLinker.link_map(text, acc, options)
+
+      {text, MapSet.to_list(mentions), MapSet.to_list(tags)}
+    end
   end
 
   def emojify(text) do

lib/pleroma/web/common_api/common_api.ex

@@ -142,7 +142,8 @@ defmodule Pleroma.Web.CommonAPI do
            make_content_html(
              status,
              attachments,
-             data
+             data,
+             visibility
            ),
          {to, cc} <- to_for_user_and_mentions(user, mentions, in_reply_to, visibility),
          context <- make_context(in_reply_to),

lib/pleroma/web/common_api/utils.ex

@@ -101,7 +101,8 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   def make_content_html(
         status,
         attachments,
-        data
+        data,
+        visibility
       ) do
     no_attachment_links =
       data
@@ -110,8 +111,15 @@ defmodule Pleroma.Web.CommonAPI.Utils do
 
     content_type = get_content_type(data["content_type"])
 
+    options =
+      if visibility == "direct" && Config.get([:instance, :safe_dm_mentions]) do
+        [safe_mention: true]
+      else
+        []
+      end
+
     status
-    |> format_input(content_type)
+    |> format_input(content_type, options)
     |> maybe_add_attachments(attachments, no_attachment_links)
     |> maybe_add_nsfw_tag(data)
   end