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diff --git a/lib/pleroma/constants.ex b/lib/pleroma/constants.ex
index bf92f65cb..343ea1acb 100644
--- a/lib/pleroma/constants.ex
+++ b/lib/pleroma/constants.ex
@@ -1,30 +1,36 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Constants do
use Const
const(as_public, do: "https://www.w3.org/ns/activitystreams#Public")
const(object_internal_fields,
do: [
"reactions",
"reaction_count",
"likes",
"like_count",
"announcements",
"announcement_count",
"emoji",
"context_id",
"deleted_activity_id",
"pleroma_internal",
"generator"
]
)
const(static_only_files,
do:
~w(index.html robots.txt static static-fe finmoji emoji packs sounds images instance sw.js sw-pleroma.js favicon.png schemas doc embed.js embed.css)
)
+
+ # basic regex, just there to weed out potential mistakes
+ # https://datatracker.ietf.org/doc/html/rfc2045#section-5.1
+ const(mime_regex,
+ do: ~r/^[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+\/[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+(; .*)?$/
+ )
end
diff --git a/lib/pleroma/ecto_type/activity_pub/object_validators/mime.ex b/lib/pleroma/ecto_type/activity_pub/object_validators/mime.ex
new file mode 100644
index 000000000..31d51577d
--- /dev/null
+++ b/lib/pleroma/ecto_type/activity_pub/object_validators/mime.ex
@@ -0,0 +1,25 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.MIME do
+ use Ecto.Type
+
+ require Pleroma.Constants
+
+ def type, do: :string
+
+ def cast(mime) when is_binary(mime) do
+ if mime =~ Pleroma.Constants.mime_regex() do
+ {:ok, mime}
+ else
+ {:ok, "application/octet-stream"}
+ end
+ end
+
+ def cast(_), do: :error
+
+ def dump(data), do: {:ok, data}
+
+ def load(data), do: {:ok, data}
+end

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