mobilizon/lib/mobilizon_web/http_signature.ex

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defmodule MobilizonWeb.HTTPSignaturePlug do
@moduledoc """
# HTTPSignaturePlug
Plug to check HTTP Signatures on every incoming request
"""
alias Mobilizon.Service.HTTPSignatures
import Plug.Conn
require Logger
def init(options) do
options
end
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
conn
end
def call(conn, _opts) do
actor = conn.params["actor"]
Logger.debug(fn ->
"Checking sig for #{actor}"
end)
[signature | _] = get_req_header(conn, "signature")
cond do
# Dialyzer doesn't like this line
signature && String.contains?(signature, actor) ->
conn =
conn
|> put_req_header(
"(request-target)",
String.downcase("#{conn.method}") <> " #{conn.request_path}"
)
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
signature ->
Logger.debug("Signature not from actor")
assign(conn, :valid_signature, false)
true ->
Logger.debug("No signature header!")
conn
end
end
end