From 55a13fc3607c9d753e6fca596010c0a96ba3fba8 Mon Sep 17 00:00:00 2001
From: Mark Felder <feld@feld.me>
Date: Mon, 8 Feb 2021 15:32:47 -0600
Subject: MRF NoEmptyPolicy: Deny posts from local users if there is no content
 or only mentions.

Helps prevent accidental button mashes from submitting incomplete posts
---
 .../web/activity_pub/mrf/no_empty_policy_test.exs  | 154 +++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs

(limited to 'test')

diff --git a/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs b/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs
new file mode 100644
index 000000000..fbcf68414
--- /dev/null
+++ b/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs
@@ -0,0 +1,154 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.NoEmptyPolicyTest do
+  use Pleroma.DataCase
+  alias Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy
+
+  setup_all do: clear_config([:mrf, :policies], [Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy])
+
+  test "Notes with content are exempt" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "source" => "this is a test post",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "type" => "Note"
+      },
+      "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "type" => "Create"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:ok, message}
+  end
+
+  test "Polls are exempt" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "oneOf" => [
+          %{
+            "name" => "chocolate",
+            "replies" => %{"totalItems" => 0, "type" => "Collection"},
+            "type" => "Note"
+          },
+          %{
+            "name" => "vanilla",
+            "replies" => %{"totalItems" => 0, "type" => "Collection"},
+            "type" => "Note"
+          }
+        ],
+        "source" => "@user2",
+        "to" => [
+          "https://www.w3.org/ns/activitystreams#Public",
+          "http://localhost:4001/users/user2"
+        ],
+        "type" => "Question"
+      },
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public",
+        "http://localhost:4001/users/user2"
+      ],
+      "type" => "Create"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:ok, message}
+  end
+
+  test "Notes with attachments are exempt" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [
+          %{
+            "actor" => "http://localhost:4001/users/testuser",
+            "mediaType" => "image/png",
+            "name" => "",
+            "type" => "Document",
+            "url" => [
+              %{
+                "href" =>
+                  "http://localhost:4001/media/68ba231cf12e1382ce458f1979969f8ed5cc07ba198a02e653464abaf39bdb90.png",
+                "mediaType" => "image/png",
+                "type" => "Link"
+              }
+            ]
+          }
+        ],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "source" => "@user2",
+        "to" => [
+          "https://www.w3.org/ns/activitystreams#Public",
+          "http://localhost:4001/users/user2"
+        ],
+        "type" => "Note"
+      },
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public",
+        "http://localhost:4001/users/user2"
+      ],
+      "type" => "Create"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:ok, message}
+  end
+
+  test "Notes with only mentions are denied" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "source" => "@user2",
+        "to" => [
+          "https://www.w3.org/ns/activitystreams#Public",
+          "http://localhost:4001/users/user2"
+        ],
+        "type" => "Note"
+      },
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public",
+        "http://localhost:4001/users/user2"
+      ],
+      "type" => "Create"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:reject, "[NoEmptyPolicy]"}
+  end
+
+  test "Notes with no content are denied" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "source" => "",
+        "to" => [
+          "https://www.w3.org/ns/activitystreams#Public"
+        ],
+        "type" => "Note"
+      },
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public"
+      ],
+      "type" => "Create"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:reject, "[NoEmptyPolicy]"}
+  end
+end
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