distraction.party/lib/pleroma/plugs/http_signature.ex

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defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
alias Pleroma.Web.HTTPSignatures
alias Pleroma.Web.ActivityPub.Utils
import Plug.Conn
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require Logger
def init(options) do
options
end
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
conn
end
def call(conn, _opts) do
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user = Utils.get_ap_id(conn.params["actor"])
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Logger.debug("Checking sig for #{user}")
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[signature | _] = get_req_header(conn, "signature")
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cond do
signature && String.contains?(signature, user) ->
conn =
conn
|> put_req_header(
"(request-target)",
String.downcase("#{conn.method}") <> " #{conn.request_path}"
)
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
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signature ->
Logger.debug("Signature not from actor")
assign(conn, :valid_signature, false)
true ->
Logger.debug("No signature header!")
conn
end
end
end