4 files changed, 28 insertions, 9 deletions
diff --git a/lib/pleroma/formatter.ex b/lib/pleroma/formatter.ex
index 133683794..b6079551c 100644
--- a/lib/pleroma/formatter.ex
+++ b/lib/pleroma/formatter.ex
@@ -5,6 +5,8 @@ defmodule Pleroma.Formatter do
   alias Pleroma.Emoji
 
   @tag_regex ~r/\#\w+/u
+  @mardown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
+
   def parse_tags(text, data \\ %{}) do
     Regex.scan(@tag_regex, text)
     |> Enum.map(fn ["#" <> tag = full_tag] -> {full_tag, String.downcase(tag)} end)
@@ -76,6 +78,18 @@ defmodule Pleroma.Formatter do
     |> Enum.join("")
   end
 
+  @doc """
+  Escapes a special characters in mention names.
+  """
+  @spec mentions_escape(String.t(), list({String.t(), any()})) :: String.t()
+  def mentions_escape(text, mentions) do
+    mentions
+    |> Enum.reduce(text, fn {name, _}, acc ->
+      escape_name = String.replace(name, @mardown_characters_regex, "\\\\\\1")
+      String.replace(acc, name, escape_name)
+    end)
+  end
+
   @doc "changes scheme:... urls to html links"
   def add_links({subs, text}) do
     links =
diff --git a/lib/pleroma/html.ex b/lib/pleroma/html.ex
index 8a0333461..583f05aeb 100644
--- a/lib/pleroma/html.ex
+++ b/lib/pleroma/html.ex
@@ -17,15 +17,9 @@ defmodule Pleroma.HTML do
     end)
   end
 
-  def filter_tags(html, scrubber) do
-    html |> Scrubber.scrub(scrubber)
-  end
-
+  def filter_tags(html, scrubber), do: Scrubber.scrub(html, scrubber)
   def filter_tags(html), do: filter_tags(html, nil)
-
-  def strip_tags(html) do
-    html |> Scrubber.scrub(Scrubber.StripTags)
-  end
+  def strip_tags(html), do: Scrubber.scrub(html, Scrubber.StripTags)
 end
 
 defmodule Pleroma.HTML.Scrubber.TwitterText do
diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex
index ce0926b99..142283684 100644
--- a/lib/pleroma/web/common_api/utils.ex
+++ b/lib/pleroma/web/common_api/utils.ex
@@ -112,6 +112,9 @@ defmodule Pleroma.Web.CommonAPI.Utils do
     Enum.join([text | attachment_text], "<br>")
   end
 
+  @doc """
+  Formatting text to plain text.
+  """
   def format_input(text, mentions, tags, "text/plain") do
     text
     |> Formatter.html_escape("text/plain")
@@ -123,6 +126,9 @@ defmodule Pleroma.Web.CommonAPI.Utils do
     |> Formatter.finalize()
   end
 
+  @doc """
+  Formatting text to html.
+  """
   def format_input(text, mentions, _tags, "text/html") do
     text
     |> Formatter.html_escape("text/html")
@@ -132,8 +138,12 @@ defmodule Pleroma.Web.CommonAPI.Utils do
     |> Formatter.finalize()
   end
 
+  @doc """
+  Formatting text to markdown.
+  """
   def format_input(text, mentions, tags, "text/markdown") do
     text
+    |> Formatter.mentions_escape(mentions)
     |> Earmark.as_html!()
     |> Formatter.html_escape("text/html")
     |> String.replace(~r/\r?\n/, "")
diff --git a/lib/pleroma/web/twitter_api/views/activity_view.ex b/lib/pleroma/web/twitter_api/views/activity_view.ex
index e5caed28f..433c3b141 100644
--- a/lib/pleroma/web/twitter_api/views/activity_view.ex
+++ b/lib/pleroma/web/twitter_api/views/activity_view.ex
@@ -239,7 +239,8 @@ defmodule Pleroma.Web.TwitterAPI.ActivityView do
     {summary, content} = render_content(object)
 
     html =
-      HTML.filter_tags(content, User.html_filter_policy(opts[:for]))
+      content
+      |> HTML.filter_tags(User.html_filter_policy(opts[:for]))
       |> Formatter.emojify(object["emoji"])
 
     reply_parent = Activity.get_in_reply_to_activity(activity)