Add :max_remote_account_fields config option

config/config.exs

@@ -256,6 +256,7 @@
   user_bio_length: 5000,
   user_name_length: 100,
   max_account_fields: 4,
+  max_remote_account_fields: 10,
   account_field_name_length: 255,
   account_field_value_length: 255,
   external_user_synchronization: true

docs/config.md

@@ -133,6 +133,7 @@ config :pleroma, Pleroma.Emails.Mailer,
 * `limit_to_local_content`: Limit unauthenticated users to search for local statutes and users only. Possible values: `:unauthenticated`, `:all` and `false`. The default is `:unauthenticated`.
 * `dynamic_configuration`: Allow transferring configuration to DB with the subsequent customization from Admin api.
 * `max_account_fields`: The maximum number of custom fields in the user profile (default: `4`)
+* `max_remote_account_fields`: The maximum number of custom fields in the remote user profile (default: `10`)
 * `account_field_name_length`: An account field name maximum length (default: `255`)
 * `account_field_value_length`: An account field value maximum length (default: `255`)
 * `external_user_synchronization`: Enabling following/followers counters synchronization for external users.

lib/pleroma/user.ex

@@ -199,12 +199,12 @@ def update_changeset(struct, params \\ %{}) do
     |> validate_length(:name, min: 1, max: name_limit)
   end
 
-  def upgrade_changeset(struct, params \\ %{}) do
+  def upgrade_changeset(struct, params \\ %{}, remote? \\ false) do
     bio_limit = Pleroma.Config.get([:instance, :user_bio_length], 5000)
     name_limit = Pleroma.Config.get([:instance, :user_name_length], 100)
 
     params = Map.put(params, :last_refreshed_at, NaiveDateTime.utc_now())
-    info_cng = User.Info.user_upgrade(struct.info, params[:info])
+    info_cng = User.Info.user_upgrade(struct.info, params[:info], remote?)
 
     struct
     |> cast(params, [

lib/pleroma/user/info.ex

@@ -256,11 +256,13 @@ def remote_user_creation(info, params) do
       :hide_followers,
       :hide_follows,
       :follower_count,
+      :fields,
       :following_count
     ])
+    |> validate_fields(true)
   end
 
-  def user_upgrade(info, params) do
+  def user_upgrade(info, params, remote? \\ false) do
     info
     |> cast(params, [
       :ap_enabled,
@@ -274,7 +276,7 @@ def user_upgrade(info, params) do
       :fields,
       :hide_followers
     ])
-    |> validate_fields()
+    |> validate_fields(remote?)
   end
 
   def profile_update(info, params) do
@@ -297,8 +299,9 @@ def profile_update(info, params) do
     |> validate_fields()
   end
 
-  def validate_fields(changeset) do
-    limit = Pleroma.Config.get([:instance, :max_account_fields], 0)
+  def validate_fields(changeset, remote? \\ false) do
+    limit_name = if remote?, do: :max_remote_account_fields, else: :max_account_fields
+    limit = Pleroma.Config.get([:instance, limit_name], 0)
 
     changeset
     |> validate_length(:fields, max: limit)

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1016,6 +1016,12 @@ defp object_to_user_data(data) do
           "url" => [%{"href" => data["image"]["url"]}]
         }
 
+    fields =
+      data
+      |> Map.get("attachment", [])
+      |> Enum.filter(fn %{"type" => t} -> t == "PropertyValue" end)
+      |> Enum.map(fn fields -> Map.take(fields, ["name", "value"]) end)
+
     locked = data["manuallyApprovesFollowers"] || false
     data = Transmogrifier.maybe_fix_user_object(data)
 
@@ -1025,6 +1031,7 @@ defp object_to_user_data(data) do
         ap_enabled: true,
         source_data: data,
         banner: banner,
+        fields: fields,
         locked: locked
       },
       avatar: avatar,

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -611,7 +611,7 @@ def handle_incoming(
         |> Map.put(:info, %{banner: banner, locked: locked, fields: fields})
 
       actor
-      |> User.upgrade_changeset(update_data)
+      |> User.upgrade_changeset(update_data, true)
       |> User.update_and_set_cache()
 
       ActivityPub.update(%{

test/web/activity_pub/transmogrifier_test.exs

@@ -539,6 +539,24 @@ test "it works with custom profile fields" do
 
       user = User.get_cached_by_ap_id(user.ap_id)
 
+      assert User.Info.fields(user.info) == [
+               %{"name" => "foo", "value" => "updated"},
+               %{"name" => "foo1", "value" => "updated"}
+             ]
+
+      Pleroma.Config.put([:instance, :max_remote_account_fields], 2)
+
+      update_data =
+        put_in(update_data, ["object", "attachment"], [
+          %{"name" => "foo", "type" => "PropertyValue", "value" => "bar"},
+          %{"name" => "foo11", "type" => "PropertyValue", "value" => "bar11"},
+          %{"name" => "foo22", "type" => "PropertyValue", "value" => "bar22"}
+        ])
+
+      {:ok, _} = Transmogrifier.handle_incoming(update_data)
+
+      user = User.get_cached_by_ap_id(user.ap_id)
+
       assert User.Info.fields(user.info) == [
                %{"name" => "foo", "value" => "updated"},
                %{"name" => "foo1", "value" => "updated"}