NoteValidator: Add very basic validator for Note objects.

lib/pleroma/web/activity_pub/object_validators/note_validator.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.ObjectValidators.NoteValidator do
+  use Ecto.Schema
+
+  alias Pleroma.Web.ActivityPub.ObjectValidators.Types
+
+  import Ecto.Changeset
+
+  @primary_key false
+
+  embedded_schema do
+    field(:id, :string, primary_key: true)
+    field(:to, {:array, :string}, default: [])
+    field(:cc, {:array, :string}, default: [])
+    field(:bto, {:array, :string}, default: [])
+    field(:bcc, {:array, :string}, default: [])
+    # TODO: Write type
+    field(:tag, {:array, :map}, default: [])
+    field(:type, :string)
+    field(:content, :string)
+    field(:context, :string)
+    field(:actor, Types.ObjectID)
+    field(:attributedTo, Types.ObjectID)
+    field(:summary, :string)
+    # TODO: Write type
+    field(:published, :string)
+    # TODO: Write type
+    field(:emoji, :map, default: %{})
+    field(:sensitive, :boolean, default: false)
+    # TODO: Write type
+    field(:attachment, {:array, :map}, default: [])
+    field(:replies_count, :integer, default: 0)
+    field(:like_count, :integer, default: 0)
+    field(:announcement_count, :integer, default: 0)
+    field(:inRepyTo, :string)
+
+    field(:likes, {:array, :string}, default: [])
+    field(:announcements, {:array, :string}, default: [])
+
+    # see if needed
+    field(:conversation, :string)
+    field(:context_id, :string)
+  end
+
+  def cast_and_validate(data) do
+    data
+    |> cast_data()
+    |> validate_data()
+  end
+
+  def cast_data(data) do
+    %__MODULE__{}
+    |> cast(data, __schema__(:fields))
+  end
+
+  def validate_data(data_cng) do
+    data_cng
+    |> validate_inclusion(:type, ["Note"])
+    |> validate_required([:id, :actor, :to, :cc, :type, :content, :context])
+  end
+end

test/web/activity_pub/object_validators/note_validator_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.ObjectValidators.NoteValidatorTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.ActivityPub.ObjectValidators.NoteValidator
+  alias Pleroma.Web.ActivityPub.Utils
+
+  import Pleroma.Factory
+
+  describe "Notes" do
+    setup do
+      user = insert(:user)
+
+      note = %{
+        "id" => Utils.generate_activity_id(),
+        "type" => "Note",
+        "actor" => user.ap_id,
+        "to" => [user.follower_address],
+        "cc" => [],
+        "content" => "Hellow this is content.",
+        "context" => "xxx",
+        "summary" => "a post"
+      }
+
+      %{user: user, note: note}
+    end
+
+    test "a basic note validates", %{note: note} do
+      %{valid?: true} = NoteValidator.cast_and_validate(note)
+    end
+  end
+end