Add an option to require fetches to be signed

test/plugs/http_signature_plug_test.exs

@@ -23,7 +23,65 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlugTest do
         |> HTTPSignaturePlug.call(%{})
 
       assert conn.assigns.valid_signature == true
+      assert conn.halted == false
       assert called(HTTPSignatures.validate_conn(:_))
     end
   end
+
+  describe "requries a signature when `authorized_fetch_mode` is enabled" do
+    setup do
+      Pleroma.Config.put([:activitypub, :authorized_fetch_mode], true)
+
+      on_exit(fn ->
+        Pleroma.Config.put([:activitypub, :authorized_fetch_mode], false)
+      end)
+
+      params = %{"actor" => "http://mastodon.example.org/users/admin"}
+      conn = build_conn(:get, "/doesntmattter", params)
+
+      [conn: conn]
+    end
+
+    test "when signature header is present", %{conn: conn} do
+      with_mock HTTPSignatures, validate_conn: fn _ -> false end do
+        conn =
+          conn
+          |> put_req_header(
+            "signature",
+            "keyId=\"http://mastodon.example.org/users/admin#main-key"
+          )
+          |> HTTPSignaturePlug.call(%{})
+
+        assert conn.assigns.valid_signature == false
+        assert conn.halted == true
+        assert conn.status == 401
+        assert conn.state == :sent
+        assert conn.resp_body == "Request not signed"
+        assert called(HTTPSignatures.validate_conn(:_))
+      end
+
+      with_mock HTTPSignatures, validate_conn: fn _ -> true end do
+        conn =
+          conn
+          |> put_req_header(
+            "signature",
+            "keyId=\"http://mastodon.example.org/users/admin#main-key"
+          )
+          |> HTTPSignaturePlug.call(%{})
+
+        assert conn.assigns.valid_signature == true
+        assert conn.halted == false
+        assert called(HTTPSignatures.validate_conn(:_))
+      end
+    end
+
+    test "halts the connection when `signature` header is not present", %{conn: conn} do
+      conn = HTTPSignaturePlug.call(conn, %{})
+      assert conn.assigns[:valid_signature] == nil
+      assert conn.halted == true
+      assert conn.status == 401
+      assert conn.state == :sent
+      assert conn.resp_body == "Request not signed"
+    end
+  end
 end