fix fetching AP objects with application/json

lib/pleroma/web/ostatus/ostatus_controller.ex

@@ -33,6 +33,9 @@ def feed_redirect(conn, %{"nickname" => nickname}) do
       "activity+json" ->
         ActivityPubController.call(conn, :user)
 
+      "json" ->
+        ActivityPubController.call(conn, :user)
+
       _ ->
         with %User{} = user <- User.get_cached_by_nickname(nickname) do
           redirect(conn, external: OStatus.feed_path(user))
@@ -94,7 +97,7 @@ def salmon_incoming(conn, _) do
   end
 
   def object(conn, %{"uuid" => uuid}) do
-    if get_format(conn) == "activity+json" do
+    if get_format(conn) in ["activity+json", "json"] do
       ActivityPubController.call(conn, :object)
     else
       with id <- o_status_url(conn, :object, uuid),
@@ -119,7 +122,7 @@ def object(conn, %{"uuid" => uuid}) do
   end
 
   def activity(conn, %{"uuid" => uuid}) do
-    if get_format(conn) == "activity+json" do
+    if get_format(conn) in ["activity+json", "json"] do
       ActivityPubController.call(conn, :activity)
     else
       with id <- o_status_url(conn, :activity, uuid),

lib/pleroma/web/router.ex

@@ -488,11 +488,11 @@ defmodule Pleroma.Web.Router do
   end
 
   pipeline :ap_relay do
-    plug(:accepts, ["activity+json"])
+    plug(:accepts, ["activity+json", "json"])
   end
 
   pipeline :ostatus do
-    plug(:accepts, ["html", "xml", "atom", "activity+json"])
+    plug(:accepts, ["html", "xml", "atom", "activity+json", "json"])
   end
 
   pipeline :oembed do
@@ -521,7 +521,7 @@ defmodule Pleroma.Web.Router do
   end
 
   pipeline :activitypub do
-    plug(:accepts, ["activity+json"])
+    plug(:accepts, ["activity+json", "json"])
     plug(Pleroma.Web.Plugs.HTTPSignaturePlug)
   end
 
@@ -536,7 +536,7 @@ defmodule Pleroma.Web.Router do
   end
 
   pipeline :activitypub_client do
-    plug(:accepts, ["activity+json"])
+    plug(:accepts, ["activity+json", "json"])
     plug(:fetch_session)
     plug(Pleroma.Plugs.OAuthPlug)
     plug(Pleroma.Plugs.BasicAuthDecoderPlug)