Add patches to accept MathML

patches/pr642_receive-mathml.patch

@@ -0,0 +1,146 @@
+From 1cf33a318de09b2624c8d92b635d710379ac7ef8 Mon Sep 17 00:00:00 2001
+From: Calvin Lee <pounce@integraldoma.in>
+Date: Sat, 16 Sep 2023 21:33:33 +0000
+Subject: [PATCH] Allow MathML core tags in sanitized content
+
+---
+ config/config.exs         |   1 +
+ priv/scrubbers/default.ex | 113 ++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 114 insertions(+)
+
+diff --git a/config/config.exs b/config/config.exs
+index e919910b3..0cc0f2577 100644
+--- a/config/config.exs
++++ b/config/config.exs
+@@ -302,6 +302,7 @@ config :pleroma, :markup,
+   allow_headings: false,
+   allow_tables: false,
+   allow_fonts: false,
++  allow_math: false,
+   scrub_policy: [
+     Pleroma.HTML.Scrubber.Default,
+     Pleroma.HTML.Transform.MediaProxy
+diff --git a/priv/scrubbers/default.ex b/priv/scrubbers/default.ex
+index 74de910fd..2eba385dd 100644
+--- a/priv/scrubbers/default.ex
++++ b/priv/scrubbers/default.ex
+@@ -124,6 +124,119 @@ defmodule Pleroma.HTML.Scrubber.Default do
+     Meta.allow_tag_with_these_attributes(:font, ["face"])
+   end
+ 
++  if Pleroma.Config.get([:markup, :allow_math]) do
++    Meta.allow_tag_with_these_attributes("annotation", ["encoding"])
++    Meta.allow_tag_with_these_attributes(:"annotation-xml", ["encoding"])
++
++    Meta.allow_tag_with_these_attributes(:math, [
++      "display",
++      "displaystyle",
++      "mathvariant",
++      "scriptlevel"
++    ])
++
++    basic_math_tags = [
++      "maction",
++      "merror",
++      :mi,
++      "mmultiscripts",
++      :mn,
++      "mphantom",
++      "mprescripts",
++      "mroot",
++      "mrow",
++      "ms",
++      "msqrt",
++      "mstyle",
++      "msub",
++      "msubsup",
++      "msup",
++      "mtable",
++      "mtext",
++      "mtr",
++      "semantics"
++    ]
++
++    for tag <- basic_math_tags do
++      Meta.allow_tag_with_these_attributes(unquote(tag), [
++        "mathvariant",
++        "displaystyle",
++        "scriptlevel"
++      ])
++    end
++
++    Meta.allow_tag_with_these_attributes("mfrac", [
++      "displaystyle",
++      "linethickness",
++      "mathvariant",
++      "scriptlevel"
++    ])
++
++    Meta.allow_tag_with_these_attributes(:mo, [
++      "displaystyle",
++      "form",
++      "largeop",
++      "lspace",
++      "mathvariant",
++      "minsize",
++      "movablelimits",
++      "rspace",
++      "scriptlevel",
++      "stretchy",
++      "symmetric"
++    ])
++
++    Meta.allow_tag_with_these_attributes("mover", [
++      "accent",
++      "displaystyle",
++      "mathvariant",
++      "scriptlevel"
++    ])
++
++    Meta.allow_tag_with_these_attributes("mpadded", [
++      "depth",
++      "displaystyle",
++      "height",
++      "lspace",
++      "mathvariant",
++      "scriptlevel",
++      "voffset",
++      "width"
++    ])
++
++    Meta.allow_tag_with_these_attributes("mspace", [
++      "depth",
++      "displaystyle",
++      "height",
++      "mathvariant",
++      "scriptlevel",
++      "width"
++    ])
++
++    Meta.allow_tag_with_these_attributes("mtd", [
++      "columnspan",
++      "displaystyle",
++      "mathvariant",
++      "rowspan",
++      "scriptlevel"
++    ])
++
++    Meta.allow_tag_with_these_attributes("munder", [
++      "accentunder",
++      "displaystyle",
++      "mathvariant",
++      "scriptlevel"
++    ])
++
++    Meta.allow_tag_with_these_attributes("munderover", [
++      "accent",
++      "accentunder",
++      "displaystyle",
++      "mathvariant",
++      "scriptlevel"
++    ])
++  end
++
+   Meta.allow_tag_with_these_attributes(:center, [])
+   Meta.allow_tag_with_these_attributes(:small, [])
+ 

patches/series

@@ -9,3 +9,5 @@ pr814_07_fix-bmp-metadata-handling.patch
 pr814_08_federation-with-multi-ld-profiles.patch
 pr814_09_fix-multi-selection-poll-counts.patch
 pr814_10_fix-swagger-ui.patch
+# Preserve math markup from other instances
+pr642_receive-mathml.patch