Handle sensitive property.

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -58,7 +58,7 @@ def render("status.json", %{activity: %{data: %{"object" => object}} = activity}
     announcement_count = object["announcement_count"] || 0
 
     tags = object["tag"] || []
-    sensitive = Enum.member?(tags, "nsfw")
+    sensitive = object["sensitive"] || Enum.member?(tags, "nsfw")
 
     mentions = activity.data["to"]
     |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)

lib/pleroma/web/twitter_api/representers/activity_representer.ex

@@ -133,7 +133,9 @@ def to_map(%Activity{data: %{"object" => %{"content" => content} = object}} = ac
     conversation_id = conversation_id(activity)
 
     tags = activity.data["object"]["tag"] || []
-    possibly_sensitive = Enum.member?(tags, "nsfw")
+    possibly_sensitive = activity.data["object"]["sensitive"] || Enum.member?(tags, "nsfw")
+
+    tags = if possibly_sensitive, do: ["nsfw" | tags], else: tags
 
     summary = activity.data["object"]["summary"]
     content = if !!summary and summary != "" do

test/fixtures/mastodon-post-activity.json

@@ -36,7 +36,7 @@
         "inReplyTo": null,
         "inReplyToAtomUri": null,
         "published": "2018-02-12T14:08:20Z",
-        "sensitive": false,
+        "sensitive": true,
         "summary": "cw",
         "tag": [
             {

test/web/activity_pub/transmogrifier_test.exs

@@ -33,6 +33,7 @@ test "it works for incoming notices" do
       ]
       assert object["actor"] == "http://mastodon.example.org/users/admin"
       assert object["attributedTo"] == "http://mastodon.example.org/users/admin"
+      assert object["sensitive"] == true
     end
 
     test "it works for incoming follow requests" do