Merge branch 'earmark' into 'develop'

Upgrade Earmark to v1.4.15

Closes #1942 and #2026

See merge request pleroma/pleroma!3076

11 files changed, 131 insertions, 342 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a0171763..ed6e548dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Applying ConcurrentLimiter settings via AdminAPI
 - User login failures if their `notification_settings` were in a NULL state.
 - Mix task `pleroma.user delete_activities` query transaction timeout is now :infinity
+- Fixed some Markdown issues, including trailing slash in links.
 
 ## [2.3.0] - 2020-03-01
 
diff --git a/lib/pleroma/earmark_renderer.ex b/lib/pleroma/earmark_renderer.ex
deleted file mode 100644
index 31cae3c72..000000000
--- a/lib/pleroma/earmark_renderer.ex
+++ /dev/null
@@ -1,256 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-#
-# This file is derived from Earmark, under the following copyright:
-# Copyright © 2014 Dave Thomas, The Pragmatic Programmers
-# SPDX-License-Identifier: Apache-2.0
-# Upstream: https://github.com/pragdave/earmark/blob/master/lib/earmark/html_renderer.ex
-defmodule Pleroma.EarmarkRenderer do
-  @moduledoc false
-
-  alias Earmark.Block
-  alias Earmark.Context
-  alias Earmark.HtmlRenderer
-  alias Earmark.Options
-
-  import Earmark.Inline, only: [convert: 3]
-  import Earmark.Helpers.HtmlHelpers
-  import Earmark.Message, only: [add_messages_from: 2, get_messages: 1, set_messages: 2]
-  import Earmark.Context, only: [append: 2, set_value: 2]
-  import Earmark.Options, only: [get_mapper: 1]
-
-  @doc false
-  def render(blocks, %Context{options: %Options{}} = context) do
-    messages = get_messages(context)
-
-    {contexts, html} =
-      get_mapper(context.options).(
-        blocks,
-        &render_block(&1, put_in(context.options.messages, []))
-      )
-      |> Enum.unzip()
-
-    all_messages =
-      contexts
-      |> Enum.reduce(messages, fn ctx, messages1 -> messages1 ++ get_messages(ctx) end)
-
-    {put_in(context.options.messages, all_messages), html |> IO.iodata_to_binary()}
-  end
-
-  #############
-  # Paragraph #
-  #############
-  defp render_block(%Block.Para{lnb: lnb, lines: lines, attrs: attrs}, context) do
-    lines = convert(lines, lnb, context)
-    add_attrs(lines, "<p>#{lines.value}</p>", attrs, [], lnb)
-  end
-
-  ########
-  # Html #
-  ########
-  defp render_block(%Block.Html{html: html}, context) do
-    {context, html}
-  end
-
-  defp render_block(%Block.HtmlComment{lines: lines}, context) do
-    {context, lines}
-  end
-
-  defp render_block(%Block.HtmlOneline{html: html}, context) do
-    {context, html}
-  end
-
-  #########
-  # Ruler #
-  #########
-  defp render_block(%Block.Ruler{lnb: lnb, attrs: attrs}, context) do
-    add_attrs(context, "<hr />", attrs, [], lnb)
-  end
-
-  ###########
-  # Heading #
-  ###########
-  defp render_block(
-         %Block.Heading{lnb: lnb, level: level, content: content, attrs: attrs},
-         context
-       ) do
-    converted = convert(content, lnb, context)
-    html = "<h#{level}>#{converted.value}</h#{level}>"
-    add_attrs(converted, html, attrs, [], lnb)
-  end
-
-  ##############
-  # Blockquote #
-  ##############
-
-  defp render_block(%Block.BlockQuote{lnb: lnb, blocks: blocks, attrs: attrs}, context) do
-    {context1, body} = render(blocks, context)
-    html = "<blockquote>#{body}</blockquote>"
-    add_attrs(context1, html, attrs, [], lnb)
-  end
-
-  #########
-  # Table #
-  #########
-
-  defp render_block(
-         %Block.Table{lnb: lnb, header: header, rows: rows, alignments: aligns, attrs: attrs},
-         context
-       ) do
-    {context1, html} = add_attrs(context, "<table>", attrs, [], lnb)
-    context2 = set_value(context1, html)
-
-    context3 =
-      if header do
-        append(add_trs(append(context2, "<thead>"), [header], "th", aligns, lnb), "</thead>")
-      else
-        # Maybe an error, needed append(context, html)
-        context2
-      end
-
-    context4 = append(add_trs(append(context3, "<tbody>"), rows, "td", aligns, lnb), "</tbody>")
-
-    {context4, [context4.value, "</table>"]}
-  end
-
-  ########
-  # Code #
-  ########
-
-  defp render_block(
-         %Block.Code{lnb: lnb, language: language, attrs: attrs} = block,
-         %Context{options: options} = context
-       ) do
-    class =
-      if language, do: ~s{ class="#{code_classes(language, options.code_class_prefix)}"}, else: ""
-
-    tag = ~s[<pre><code#{class}>]
-    lines = options.render_code.(block)
-    html = ~s[#{tag}#{lines}</code></pre>]
-    add_attrs(context, html, attrs, [], lnb)
-  end
-
-  #########
-  # Lists #
-  #########
-
-  defp render_block(
-         %Block.List{lnb: lnb, type: type, blocks: items, attrs: attrs, start: start},
-         context
-       ) do
-    {context1, content} = render(items, context)
-    html = "<#{type}#{start}>#{content}</#{type}>"
-    add_attrs(context1, html, attrs, [], lnb)
-  end
-
-  # format a single paragraph list item, and remove the para tags
-  defp render_block(
-         %Block.ListItem{lnb: lnb, blocks: blocks, spaced: false, attrs: attrs},
-         context
-       )
-       when length(blocks) == 1 do
-    {context1, content} = render(blocks, context)
-    content = Regex.replace(~r{</?p>}, content, "")
-    html = "<li>#{content}</li>"
-    add_attrs(context1, html, attrs, [], lnb)
-  end
-
-  # format a spaced list item
-  defp render_block(%Block.ListItem{lnb: lnb, blocks: blocks, attrs: attrs}, context) do
-    {context1, content} = render(blocks, context)
-    html = "<li>#{content}</li>"
-    add_attrs(context1, html, attrs, [], lnb)
-  end
-
-  ##################
-  # Footnote Block #
-  ##################
-
-  defp render_block(%Block.FnList{blocks: footnotes}, context) do
-    items =
-      Enum.map(footnotes, fn note ->
-        blocks = append_footnote_link(note)
-        %Block.ListItem{attrs: "#fn:#{note.number}", type: :ol, blocks: blocks}
-      end)
-
-    {context1, html} = render_block(%Block.List{type: :ol, blocks: items}, context)
-    {context1, Enum.join([~s[<div class="footnotes">], "<hr />", html, "</div>"])}
-  end
-
-  #######################################
-  # Isolated IALs are rendered as paras #
-  #######################################
-
-  defp render_block(%Block.Ial{verbatim: verbatim}, context) do
-    {context, "<p>{:#{verbatim}}</p>"}
-  end
-
-  ####################
-  # IDDef is ignored #
-  ####################
-
-  defp render_block(%Block.IdDef{}, context), do: {context, ""}
-
-  #####################################
-  # And here are the inline renderers #
-  #####################################
-
-  defdelegate br, to: HtmlRenderer
-  defdelegate codespan(text), to: HtmlRenderer
-  defdelegate em(text), to: HtmlRenderer
-  defdelegate strong(text), to: HtmlRenderer
-  defdelegate strikethrough(text), to: HtmlRenderer
-
-  defdelegate link(url, text), to: HtmlRenderer
-  defdelegate link(url, text, title), to: HtmlRenderer
-
-  defdelegate image(path, alt, title), to: HtmlRenderer
-
-  defdelegate footnote_link(ref, backref, number), to: HtmlRenderer
-
-  # Table rows
-  defp add_trs(context, rows, tag, aligns, lnb) do
-    numbered_rows =
-      rows
-      |> Enum.zip(Stream.iterate(lnb, &(&1 + 1)))
-
-    numbered_rows
-    |> Enum.reduce(context, fn {row, lnb}, ctx ->
-      append(add_tds(append(ctx, "<tr>"), row, tag, aligns, lnb), "</tr>")
-    end)
-  end
-
-  defp add_tds(context, row, tag, aligns, lnb) do
-    Enum.reduce(1..length(row), context, add_td_fn(row, tag, aligns, lnb))
-  end
-
-  defp add_td_fn(row, tag, aligns, lnb) do
-    fn n, ctx ->
-      style =
-        case Enum.at(aligns, n - 1, :default) do
-          :default -> ""
-          align -> " style=\"text-align: #{align}\""
-        end
-
-      col = Enum.at(row, n - 1)
-      converted = convert(col, lnb, set_messages(ctx, []))
-      append(add_messages_from(ctx, converted), "<#{tag}#{style}>#{converted.value}</#{tag}>")
-    end
-  end
-
-  ###############################
-  # Append Footnote Return Link #
-  ###############################
-
-  defdelegate append_footnote_link(note), to: HtmlRenderer
-  defdelegate append_footnote_link(note, fnlink), to: HtmlRenderer
-
-  defdelegate render_code(lines), to: HtmlRenderer
-
-  defp code_classes(language, prefix) do
-    ["" | String.split(prefix || "")]
-    |> Enum.map(fn pfx -> "#{pfx}#{language}" end)
-    |> Enum.join(" ")
-  end
-end
diff --git a/lib/pleroma/formatter.ex b/lib/pleroma/formatter.ex
index 7a08e48a9..764e347ec 100644
--- a/lib/pleroma/formatter.ex
+++ b/lib/pleroma/formatter.ex
@@ -121,6 +121,10 @@ defmodule Pleroma.Formatter do
     end
   end
 
+  def markdown_to_html(text) do
+    Earmark.as_html!(text, %Earmark.Options{compact_output: true})
+  end
+
   def html_escape({text, mentions, hashtags}, type) do
     {html_escape(text, type), mentions, hashtags}
   end
diff --git a/lib/pleroma/web/activity_pub/object_validators/audio_video_validator.ex b/lib/pleroma/web/activity_pub/object_validators/audio_video_validator.ex
index 8a5a60526..27e14b16d 100644
--- a/lib/pleroma/web/activity_pub/object_validators/audio_video_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/audio_video_validator.ex
@@ -5,7 +5,6 @@
 defmodule Pleroma.Web.ActivityPub.ObjectValidators.AudioVideoValidator do
   use Ecto.Schema
 
-  alias Pleroma.EarmarkRenderer
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
   alias Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator
   alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
@@ -110,7 +109,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AudioVideoValidator do
        when is_binary(content) do
     content =
       content
-      |> Earmark.as_html!(%Earmark.Options{renderer: EarmarkRenderer})
+      |> Pleroma.Formatter.markdown_to_html()
       |> Pleroma.HTML.filter_tags()
 
     Map.put(data, "content", content)
diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex
index 4e6a3feb0..94a378e11 100644
--- a/lib/pleroma/web/common_api/utils.ex
+++ b/lib/pleroma/web/common_api/utils.ex
@@ -286,7 +286,7 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   def format_input(text, "text/markdown", options) do
     text
     |> Formatter.mentions_escape(options)
-    |> Earmark.as_html!(%Earmark.Options{renderer: Pleroma.EarmarkRenderer})
+    |> Formatter.markdown_to_html()
     |> Formatter.linkify(options)
     |> Formatter.html_escape("text/html")
   end
diff --git a/mix.exs b/mix.exs
index fe5d9d963..b449c82b3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -144,7 +144,7 @@ defmodule Pleroma.Mixfile do
       {:ex_aws, "~> 2.1.6"},
       {:ex_aws_s3, "~> 2.0"},
       {:sweet_xml, "~> 0.6.6"},
-      {:earmark, "1.4.3"},
+      {:earmark, "1.4.15"},
       {:bbcode_pleroma, "~> 0.2.0"},
       {:crypt,
        git: "https://git.pleroma.social/pleroma/elixir-libraries/crypt.git",
diff --git a/mix.lock b/mix.lock
index 19b90660b..22c31e0d6 100644
--- a/mix.lock
+++ b/mix.lock
@@ -27,8 +27,8 @@
   "db_connection": {:hex, :db_connection, "2.3.1", "4c9f3ed1ef37471cbdd2762d6655be11e38193904d9c5c1c9389f1b891a3088e", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm", "abaab61780dde30301d840417890bd9f74131041afd02174cf4e10635b3a63f5"},
   "decimal": {:hex, :decimal, "2.0.0", "a78296e617b0f5dd4c6caf57c714431347912ffb1d0842e998e9792b5642d697", [:mix], [], "hexpm", "34666e9c55dea81013e77d9d87370fe6cb6291d1ef32f46a1600230b1d44f577"},
   "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"},
-  "earmark": {:hex, :earmark, "1.4.3", "364ca2e9710f6bff494117dbbd53880d84bebb692dafc3a78eb50aa3183f2bfd", [:mix], [], "hexpm", "8cf8a291ebf1c7b9539e3cddb19e9cef066c2441b1640f13c34c1d3cfc825fec"},
-  "earmark_parser": {:hex, :earmark_parser, "1.4.10", "6603d7a603b9c18d3d20db69921527f82ef09990885ed7525003c7fe7dc86c56", [:mix], [], "hexpm", "8e2d5370b732385db2c9b22215c3f59c84ac7dda7ed7e544d7c459496ae519c0"},
+  "earmark": {:hex, :earmark, "1.4.15", "2c7f924bf495ec1f65bd144b355d0949a05a254d0ec561740308a54946a67888", [:mix], [{:earmark_parser, ">= 1.4.13", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "3b1209b85bc9f3586f370f7c363f6533788fb4e51db23aa79565875e7f9999ee"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.13", "0c98163e7d04a15feb62000e1a891489feb29f3d10cb57d4f845c405852bbef8", [:mix], [], "hexpm", "d602c26af3a0af43d2f2645613f65841657ad6efc9f0e361c3b6c06b578214ba"},
   "ecto": {:hex, :ecto, "3.4.6", "08f7afad3257d6eb8613309af31037e16c36808dfda5a3cd0cb4e9738db030e4", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "6f13a9e2a62e75c2dcfc7207bfc65645ab387af8360db4c89fee8b5a4bf3f70b"},
   "ecto_enum": {:hex, :ecto_enum, "1.4.0", "d14b00e04b974afc69c251632d1e49594d899067ee2b376277efd8233027aec8", [:mix], [{:ecto, ">= 3.0.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "> 3.0.0", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:mariaex, ">= 0.0.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm", "8fb55c087181c2b15eee406519dc22578fa60dd82c088be376d0010172764ee4"},
   "ecto_explain": {:hex, :ecto_explain, "0.1.2", "a9d504cbd4adc809911f796d5ef7ebb17a576a6d32286c3d464c015bd39d5541", [:mix], [], "hexpm", "1d0e7798ae30ecf4ce34e912e5354a0c1c832b7ebceba39298270b9a9f316330"},
diff --git a/priv/scrubbers/default.ex b/priv/scrubbers/default.ex
index 7b06994de..4694a92a5 100644
--- a/priv/scrubbers/default.ex
+++ b/priv/scrubbers/default.ex
@@ -39,6 +39,7 @@ defmodule Pleroma.HTML.Scrubber.Default do
   Meta.allow_tag_with_these_attributes(:code, [])
   Meta.allow_tag_with_these_attributes(:del, [])
   Meta.allow_tag_with_these_attributes(:em, [])
+  Meta.allow_tag_with_these_attributes(:hr, [])
   Meta.allow_tag_with_these_attributes(:i, [])
   Meta.allow_tag_with_these_attributes(:li, [])
   Meta.allow_tag_with_these_attributes(:ol, [])
@@ -58,6 +59,8 @@ defmodule Pleroma.HTML.Scrubber.Default do
   Meta.allow_tag_with_this_attribute_values(:span, "class", ["h-card"])
   Meta.allow_tag_with_these_attributes(:span, [])
 
+  Meta.allow_tag_with_this_attribute_values(:code, "class", ["inline"])
+
   @allow_inline_images Pleroma.Config.get([:markup, :allow_inline_images])
 
   if @allow_inline_images do
diff --git a/test/pleroma/earmark_renderer_test.exs b/test/pleroma/earmark_renderer_test.exs
deleted file mode 100644
index 776bc496a..000000000
--- a/test/pleroma/earmark_renderer_test.exs
+++ /dev/null
@@ -1,79 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-defmodule Pleroma.EarmarkRendererTest do
-  use Pleroma.DataCase, async: true
-
-  test "Paragraph" do
-    code = ~s[Hello\n\nWorld!]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<p>Hello</p><p>World!</p>"
-  end
-
-  test "raw HTML" do
-    code = ~s[<a href="http://example.org/">OwO</a><!-- what's this?-->]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<p>#{code}</p>"
-  end
-
-  test "rulers" do
-    code = ~s[before\n\n-----\n\nafter]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<p>before</p><hr /><p>after</p>"
-  end
-
-  test "headings" do
-    code = ~s[# h1\n## h2\n### h3\n]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<h1>h1</h1><h2>h2</h2><h3>h3</h3>]
-  end
-
-  test "blockquote" do
-    code = ~s[> whoms't are you quoting?]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<blockquote><p>whoms’t are you quoting?</p></blockquote>"
-  end
-
-  test "code" do
-    code = ~s[`mix`]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<p><code class="inline">mix</code></p>]
-
-    code = ~s[``mix``]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<p><code class="inline">mix</code></p>]
-
-    code = ~s[```\nputs "Hello World"\n```]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<pre><code class="">puts &quot;Hello World&quot;</code></pre>]
-  end
-
-  test "lists" do
-    code = ~s[- one\n- two\n- three\n- four]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<ul><li>one</li><li>two</li><li>three</li><li>four</li></ul>"
-
-    code = ~s[1. one\n2. two\n3. three\n4. four\n]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<ol><li>one</li><li>two</li><li>three</li><li>four</li></ol>"
-  end
-
-  test "delegated renderers" do
-    code = ~s[a<br/>b]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == "<p>#{code}</p>"
-
-    code = ~s[*aaaa~*]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<p><em>aaaa~</em></p>]
-
-    code = ~s[**aaaa~**]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<p><strong>aaaa~</strong></p>]
-
-    # strikethrought
-    code = ~s[<del>aaaa~</del>]
-    result = Earmark.as_html!(code, %Earmark.Options{renderer: Pleroma.EarmarkRenderer})
-    assert result == ~s[<p><del>aaaa~</del></p>]
-  end
-end
diff --git a/test/pleroma/web/common_api/utils_test.exs b/test/pleroma/web/common_api/utils_test.exs
index f2043e152..b0e567ff0 100644
--- a/test/pleroma/web/common_api/utils_test.exs
+++ b/test/pleroma/web/common_api/utils_test.exs
@@ -168,6 +168,123 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do
     end
   end
 
+  describe "format_input/3 with markdown" do
+    test "Paragraph" do
+      code = ~s[Hello\n\nWorld!]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == "<p>Hello</p><p>World!</p>"
+    end
+
+    test "links" do
+      code = "https://en.wikipedia.org/wiki/Animal_Crossing_(video_game)"
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><a href="#{code}">#{code}</a></p>]
+
+      code = "https://github.com/pragdave/earmark/"
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><a href="#{code}">#{code}</a></p>]
+    end
+
+    test "link with local mention" do
+      insert(:user, %{nickname: "lain"})
+
+      code = "https://example.com/@lain"
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><a href="#{code}">#{code}</a></p>]
+    end
+
+    test "local mentions" do
+      mario = insert(:user, %{nickname: "mario"})
+      luigi = insert(:user, %{nickname: "luigi"})
+
+      code = "@mario @luigi yo what's up?"
+      {result, _, []} = Utils.format_input(code, "text/markdown")
+
+      assert result ==
+               ~s[<p><span class="h-card"><a class="u-url mention" data-user="#{mario.id}" href="#{
+                 mario.ap_id
+               }" rel="ugc">@<span>mario</span></a></span> <span class="h-card"><a class="u-url mention" data-user="#{
+                 luigi.id
+               }" href="#{luigi.ap_id}" rel="ugc">@<span>luigi</span></a></span> yo what’s up?</p>]
+    end
+
+    test "remote mentions" do
+      mario = insert(:user, %{nickname: "mario@mushroom.world", local: false})
+      luigi = insert(:user, %{nickname: "luigi@mushroom.world", local: false})
+
+      code = "@mario@mushroom.world @luigi@mushroom.world yo what's up?"
+      {result, _, []} = Utils.format_input(code, "text/markdown")
+
+      assert result ==
+               ~s[<p><span class="h-card"><a class="u-url mention" data-user="#{mario.id}" href="#{
+                 mario.ap_id
+               }" rel="ugc">@<span>mario</span></a></span> <span class="h-card"><a class="u-url mention" data-user="#{
+                 luigi.id
+               }" href="#{luigi.ap_id}" rel="ugc">@<span>luigi</span></a></span> yo what’s up?</p>]
+    end
+
+    test "raw HTML" do
+      code = ~s[<a href="http://example.org/">OwO</a><!-- what's this?-->]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<a href="http://example.org/">OwO</a>]
+    end
+
+    test "rulers" do
+      code = ~s[before\n\n-----\n\nafter]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == "<p>before</p><hr/><p>after</p>"
+    end
+
+    test "blockquote" do
+      code = ~s[> whoms't are you quoting?]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == "<blockquote><p>whoms’t are you quoting?</p></blockquote>"
+    end
+
+    test "code" do
+      code = ~s[`mix`]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><code class="inline">mix</code></p>]
+
+      code = ~s[``mix``]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><code class="inline">mix</code></p>]
+
+      code = ~s[```\nputs "Hello World"\n```]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<pre><code>puts &quot;Hello World&quot;</code></pre>]
+
+      code = ~s[    <div>\n    </div>]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<pre><code>&lt;div&gt;\n&lt;/div&gt;</code></pre>]
+    end
+
+    test "lists" do
+      code = ~s[- one\n- two\n- three\n- four]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == "<ul><li>one</li><li>two</li><li>three</li><li>four</li></ul>"
+
+      code = ~s[1. one\n2. two\n3. three\n4. four\n]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == "<ol><li>one</li><li>two</li><li>three</li><li>four</li></ol>"
+    end
+
+    test "delegated renderers" do
+      code = ~s[*aaaa~*]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><em>aaaa~</em></p>]
+
+      code = ~s[**aaaa~**]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><strong>aaaa~</strong></p>]
+
+      # strikethrough
+      code = ~s[~~aaaa~~~]
+      {result, [], []} = Utils.format_input(code, "text/markdown")
+      assert result == ~s[<p><del>aaaa</del>~</p>]
+    end
+  end
+
   describe "context_to_conversation_id" do
     test "creates a mapping object" do
       conversation_id = Utils.context_to_conversation_id("random context")
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index fa55c2832..be94c93c2 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -597,7 +597,7 @@ defmodule Pleroma.Web.CommonAPITest do
 
       object = Object.normalize(activity, fetch: false)
 
-      assert object.data["content"] == "<p><b>2hu</b></p>alert(&#39;xss&#39;)"
+      assert object.data["content"] == "<p><b>2hu</b></p>"
       assert object.data["source"] == post
     end