From b6d7f45c60fe80b9cdaf0f7d7d5b55ee90e804f9 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Wed, 25 Aug 2021 16:11:08 -0400
Subject: [PATCH] Some things that I've long since forgotten. Let's hope they
 work

---
 lib/clacks/activity.ex                        | 54 ++++++++++++++++---
 lib/clacks/activitypub.ex                     |  8 +--
 lib/clacks/activitypub/federator.ex           | 52 +++++++++++++-----
 lib/clacks/activitypub/fetcher.ex             |  2 +-
 lib/clacks/actor.ex                           |  9 +++-
 lib/clacks/inbox.ex                           | 13 ++++-
 lib/clacks/object.ex                          | 12 ++---
 lib/clacks/timeline.ex                        |  3 ++
 lib/clacks/user.ex                            |  7 ++-
 lib/clacks/user_actions_helper.ex             | 12 +++--
 lib/clacks/worker/federate.ex                 |  4 +-
 lib/clacks/worker/send_webmention.ex          |  5 +-
 .../controllers/frontend_controller.ex        | 14 ++---
 .../templates/frontend/_timeline.html.eex     |  4 +-
 .../templates/frontend/search.html.eex        |  2 +-
 .../templates/frontend/status.html.eex        |  4 +-
 lib/clacks_web/views/frontend_view.ex         |  9 ++--
 17 files changed, 149 insertions(+), 65 deletions(-)

diff --git a/lib/clacks/activity.ex b/lib/clacks/activity.ex
index e4b955e..e4b9284 100644
--- a/lib/clacks/activity.ex
+++ b/lib/clacks/activity.ex
@@ -2,7 +2,7 @@ defmodule Clacks.Activity do
   require Logger
   use Ecto.Schema
   import Ecto.Changeset
-  alias Clacks.Repo
+  alias Clacks.{Repo, Object}
   import Ecto.Query
 
   @type t() :: %__MODULE__{}
@@ -34,9 +34,16 @@ defmodule Clacks.Activity do
     })
   end
 
-  @spec get(id :: String.t()) :: t() | nil
-  def get(id) do
-    Repo.get(__MODULE__, id)
+  @spec get(id :: String.t(), opts :: Keyword.t()) :: t() | nil
+  def get(id, opts \\ []) do
+    if Keyword.get(opts, :with_object, false) do
+      __MODULE__
+      |> where([a], a.id == ^id)
+      |> preload_object()
+      |> Repo.one()
+    else
+      Repo.get(__MODULE__, id)
+    end
   end
 
   @spec get_by_ap_id(ap_id :: String.t(), force_refetch :: boolean()) :: t() | nil
@@ -55,10 +62,32 @@ defmodule Clacks.Activity do
 
   @spec get_by_object_ap_id(object_id :: String.t()) :: t() | nil
   def get_by_object_ap_id(object_id) do
-    Repo.one(
-      from a in __MODULE__,
-        where: fragment("?->'object'->>'id'", a.data) == ^object_id
+    __MODULE__
+    |> where(
+      [a],
+      fragment("COALESCE(?->'object'->>'id', ?->>'object')", a.data, a.data) == ^object_id
     )
+    |> preload_object()
+    |> Repo.one()
+  end
+
+  @spec join_with_object(Ecto.Queryable.t()) :: Ecto.Query.t()
+  def join_with_object(query) do
+    join(query, :inner, [a], o in Object,
+      as: :object,
+      on:
+        fragment("?->>'id' = COALESCE(?->'object'->>'id', ?->>'object')", o.data, a.data, a.data)
+    )
+  end
+
+  @spec preload_object(Ecto.Queryable.t()) :: Ecto.Query.t()
+  def preload_object(query) do
+    if Ecto.Query.has_named_binding?(query, :object) do
+      query
+    else
+      join_with_object(query)
+    end
+    |> preload([_a, object: object], object: object)
   end
 
   @spec fetch(ap_id :: String.t()) :: t() | nil
@@ -91,4 +120,15 @@ defmodule Clacks.Activity do
         end
     end
   end
+
+  @spec data_with_object(activity :: Activity.t()) :: map()
+  def data_with_object(%__MODULE__{
+        data: %{"object" => object_id} = data,
+        object: %Object{data: object_data}
+      })
+      when is_binary(object_id) do
+    Map.put(data, "object", object_data)
+  end
+
+  def data_with_object(%___MODULE__{data: data}), do: data
 end
diff --git a/lib/clacks/activitypub.ex b/lib/clacks/activitypub.ex
index 5c991d1..d482bf1 100644
--- a/lib/clacks/activitypub.ex
+++ b/lib/clacks/activitypub.ex
@@ -78,20 +78,20 @@ defmodule Clacks.ActivityPub do
     }
   end
 
-  @spec create(
+  @spec internal_create(
           object :: map(),
           id :: String.t() | nil,
           actor :: String.t() | nil,
           to :: [String.t()] | nil,
           cc :: [String.t()] | nil
         ) :: map()
-  def create(object, id \\ nil, actor \\ nil, to \\ nil, cc \\ nil) do
+  def internal_create(object, id \\ nil, actor \\ nil, to \\ nil, cc \\ nil) do
     %{
       "@context" => @context,
       "id" => id || activity_id(Ecto.UUID.generate()),
       "actor" => actor || object["actor"],
       "type" => "Create",
-      "object" => object,
+      "object" => object["id"],
       "to" => to || object["to"],
       "cc" => cc || object["cc"]
     }
@@ -103,7 +103,7 @@ defmodule Clacks.ActivityPub do
     %{
       "@context" => @context,
       "type" => "Create",
-      "object" => object,
+      "object" => object["id"],
       "actor" => object["actor"] || object["attributedTo"],
       "to" => object["to"],
       "cc" => object["cc"]
diff --git a/lib/clacks/activitypub/federator.ex b/lib/clacks/activitypub/federator.ex
index 1a0cbb3..f665e5d 100644
--- a/lib/clacks/activitypub/federator.ex
+++ b/lib/clacks/activitypub/federator.ex
@@ -1,19 +1,39 @@
 defmodule Clacks.ActivityPub.Federator do
   require Logger
-  alias Clacks.{Repo, Actor, User, Keys}
+  alias Clacks.{Repo, Actor, User, Keys, Activity}
   import Ecto.Query
 
   @public "https://www.w3.org/ns/activitystreams#Public"
 
-  @spec federate_to_followers(activity :: map(), actor :: Actor.t()) :: :ok | {:error, any()}
-  def federate_to_followers(activity, actor) do
-    Repo.all(
-      from a in Actor, where: fragment("?->>'id'", a.data) in ^actor.followers, select: a.data
-    )
-    |> Enum.map(&inbox_for(activity, &1))
+  @spec federate_to_involved(activity :: Activity.t(), actor :: Actor.t()) ::
+          :ok | {:error, any()}
+  def federate_to_involved(%Activity{data: %{"to" => to, "cc" => cc}} = activity, actor) do
+    activity_for_federating = Activity.data_with_object(activity)
+
+    addressed =
+      (to ++ cc)
+      |> Enum.uniq()
+      |> List.delete(@public)
+
+    addressed_actors =
+      if actor.data["followers"] in addressed do
+        addressed = List.delete(addressed, actor.data["followers"])
+        [actor.followers | addressed]
+      else
+        addressed
+      end
+
+    Actor
+    |> where([a], a.ap_id in ^addressed_actors)
+    |> select([a], %{
+      shared_inbox: fragment("?->'endpoints'->>'sharedInbox'", a.data),
+      inbox: fragment("?->>'inbox'", a.data)
+    })
+    |> Repo.all()
+    |> Enum.map(&inbox_for(activity_for_federating, &1))
     |> Enum.uniq()
     |> Enum.reduce_while(:ok, fn inbox, _acc ->
-      case federate(activity, inbox) do
+      case do_federate(activity_for_federating, inbox) do
         {:error, _} = err ->
           {:halt, err}
 
@@ -23,8 +43,14 @@ defmodule Clacks.ActivityPub.Federator do
     end)
   end
 
-  @spec federate(activity :: map(), inbox :: String.t()) :: :ok | {:error, any()}
-  def federate(%{"actor" => actor_id} = activity, inbox) do
+  @spec federate(Activity.t(), String.t()) :: :ok | {:error, any()}
+  def federate(activity, inbox) do
+    activity_for_federating = Activity.data_with_object(activity)
+    do_federate(activity_for_federating, inbox)
+  end
+
+  @spec do_federate(activity :: map(), inbox :: String.t()) :: :ok | {:error, any()}
+  defp do_federate(%{"actor" => actor_id} = activity, inbox) do
     Logger.debug("Federating #{activity["id"]} to #{inbox}")
     %{host: inbox_host, path: inbox_path} = URI.parse(inbox)
 
@@ -71,13 +97,13 @@ defmodule Clacks.ActivityPub.Federator do
         shared_inbox_for(actor)
 
       true ->
-        actor["inbox"]
+        actor.inbox
     end
   end
 
   @spec shared_inbox_for(actor :: map()) :: String.t()
-  defp shared_inbox_for(%{"endpoints" => %{"sharedInbox" => shared}}), do: shared
-  defp shared_inbox_for(%{"inbox" => inbox}), do: inbox
+  defp shared_inbox_for(%{shared_inbox: shared}) when not is_nil(shared), do: shared
+  defp shared_inbox_for(%{inbox: inbox}), do: inbox
 
   @spec signature_timestamp() :: String.t()
   defp signature_timestamp(date \\ NaiveDateTime.utc_now()) do
diff --git a/lib/clacks/activitypub/fetcher.ex b/lib/clacks/activitypub/fetcher.ex
index fbefd86..0ccf273 100644
--- a/lib/clacks/activitypub/fetcher.ex
+++ b/lib/clacks/activitypub/fetcher.ex
@@ -44,7 +44,7 @@ defmodule Clacks.ActivityPub.Fetcher do
       data
     else
       {:error, reason} ->
-        Logger.warn("Couldn't fetch AP object at #{uri}: #{inspect(reason)}")
+        Logger.warn("Couldn't fetch AP object at #{uri}: #{reason}")
         nil
     end
   end
diff --git a/lib/clacks/actor.ex b/lib/clacks/actor.ex
index f2a0b32..f735490 100644
--- a/lib/clacks/actor.ex
+++ b/lib/clacks/actor.ex
@@ -5,7 +5,14 @@ defmodule Clacks.Actor do
   import Ecto.Query
   alias Clacks.Repo
 
-  @type t() :: %__MODULE__{}
+  @type t() :: %__MODULE__{
+          ap_id: String.t(),
+          nickname: String.t(),
+          local: boolean(),
+          data: map(),
+          followers: [String.t()],
+          user: Clacks.User.t()
+        }
 
   @primary_key {:id, FlakeId.Ecto.Type, autogenerate: true}
 
diff --git a/lib/clacks/inbox.ex b/lib/clacks/inbox.ex
index a014af8..dbcb3e6 100644
--- a/lib/clacks/inbox.ex
+++ b/lib/clacks/inbox.ex
@@ -4,9 +4,18 @@ defmodule Clacks.Inbox do
 
   defp store_activity(%{"actor" => actor, "id" => ap_id} = activity, local \\ false)
        when is_binary(actor) do
+    activity_without_embedded_object =
+      case Map.get(activity, "object") do
+        %{"id" => object_id} ->
+          Map.put(activity, "object", object_id)
+
+        _ ->
+          activity
+      end
+
     changeset =
       Activity.changeset(Activity.get_cached_by_ap_id(ap_id) || %Activity{}, %{
-        data: activity,
+        data: activity_without_embedded_object,
         local: local,
         actor: actor
       })
@@ -61,7 +70,7 @@ defmodule Clacks.Inbox do
             Logger.error("Couldn't store Accept activity: #{inspect(changeset)}")
             {:error, "Couldn't store Accept activity"}
 
-          {:ok, _accept} ->
+          {:ok, accept} ->
             ActivityPub.Federator.federate(accept, follower.data["inbox"])
         end
     end
diff --git a/lib/clacks/object.ex b/lib/clacks/object.ex
index 7e452f2..1d34a1a 100644
--- a/lib/clacks/object.ex
+++ b/lib/clacks/object.ex
@@ -53,15 +53,15 @@ defmodule Clacks.Object do
     Repo.one(from o in __MODULE__, where: fragment("?->>'id'", o.data) == ^ap_id)
   end
 
-  @spec fetch(ap_id :: String.t(), synthesize_create :: boolean(), return :: :object | :activity) ::
+  @spec fetch(url :: String.t(), synthesize_create :: boolean(), return :: :object | :activity) ::
           t() | Activity.t() | nil
-  def fetch(ap_id, synthesize_create \\ true, return \\ :object) do
-    case Clacks.ActivityPub.Fetcher.fetch_object(ap_id) do
+  def fetch(url, synthesize_create \\ true, return \\ :object) do
+    case Clacks.ActivityPub.Fetcher.fetch_object(url) do
       nil ->
         nil
 
-      data ->
-        existing = get_cached_by_ap_id(data["id"])
+      %{"id" => ap_id} = data ->
+        existing = get_cached_by_ap_id(ap_id)
 
         changeset =
           changeset(existing || %__MODULE__{}, %{
@@ -87,7 +87,7 @@ defmodule Clacks.Object do
                       })
 
                     {:ok, create} = Repo.insert_or_update(changeset)
-                    create
+                    %Clacks.Activity{create | object: object}
                   else
                     nil
                   end
diff --git a/lib/clacks/timeline.ex b/lib/clacks/timeline.ex
index c94855d..9313bc5 100644
--- a/lib/clacks/timeline.ex
+++ b/lib/clacks/timeline.ex
@@ -21,6 +21,7 @@ defmodule Clacks.Timeline do
     |> restrict_to_public(only_public)
     |> paginate(params)
     |> limit(^Map.get(params, "limit", 20))
+    |> Activity.preload_object()
     |> join_with_announced_or_liked()
     |> select(
       [activity, announced, announced_actor],
@@ -52,6 +53,7 @@ defmodule Clacks.Timeline do
     |> restrict_to_types(@timeline_types)
     |> paginate(params)
     |> limit(^Map.get(params, "limit", 20))
+    |> Activity.preload_object()
     |> join_with_announced_or_liked()
     |> select(
       [activity, actor, announced, announced_actor],
@@ -70,6 +72,7 @@ defmodule Clacks.Timeline do
     |> restrict_to_types(@timeline_types)
     |> paginate(params)
     |> limit(^Map.get(params, "limit", 20))
+    |> Activity.preload_object()
     |> join_with_actors()
     |> join_with_announced_or_liked()
     |> select(
diff --git a/lib/clacks/user.ex b/lib/clacks/user.ex
index 73b75c7..727a889 100644
--- a/lib/clacks/user.ex
+++ b/lib/clacks/user.ex
@@ -3,7 +3,12 @@ defmodule Clacks.User do
   import Ecto.Changeset
   alias Clacks.Repo
 
-  @type t() :: %__MODULE__{}
+  @type t() :: %__MODULE__{
+          username: String.t(),
+          private_key: String.t(),
+          password_hash: String.t(),
+          actor: Clacks.Actor.t()
+        }
 
   schema "users" do
     field :username, :string
diff --git a/lib/clacks/user_actions_helper.ex b/lib/clacks/user_actions_helper.ex
index 91a3b7b..653462d 100644
--- a/lib/clacks/user_actions_helper.ex
+++ b/lib/clacks/user_actions_helper.ex
@@ -17,7 +17,9 @@ defmodule Clacks.UserActionsHelper do
 
   def post_status(author, content, content_type, in_reply_to_ap_id)
       when is_binary(in_reply_to_ap_id) do
-    case Activity.get_by_ap_id(in_reply_to_ap_id) do
+    activity = Activity.get_by_ap_id(in_reply_to_ap_id) |> Activity.preload_object()
+
+    case activity do
       nil ->
         {:error, "Could find post to reply to with AP ID '#{in_reply_to_ap_id}'"}
 
@@ -33,7 +35,7 @@ defmodule Clacks.UserActionsHelper do
     note_changeset = Object.changeset_for_creating(note)
     {:ok, _object} = Repo.insert(note_changeset)
 
-    %{"id" => ap_id} = create = ActivityPub.create(note)
+    %{"id" => create_ap_id} = create = ActivityPub.internal_create(note, author.actor.ap_id)
 
     case ActivityPub.Helper.save_and_federate(create, author.actor) do
       {:ok, activity} ->
@@ -42,7 +44,7 @@ defmodule Clacks.UserActionsHelper do
         {:ok, activity}
 
       :error ->
-        {:error, "Unable to save and federate activity with ID '#{ap_id}'"}
+        {:error, "Unable to save and federate activity with ID '#{create_ap_id}'"}
     end
   end
 
@@ -75,7 +77,9 @@ defmodule Clacks.UserActionsHelper do
           {nil, nil, nil}
 
         %Activity{
-          data: %{"id" => in_reply_to_ap_id, "context" => context, "actor" => in_reply_to_actor}
+          object: %Object{
+            data: %{"id" => in_reply_to_ap_id, "context" => context, "actor" => in_reply_to_actor}
+          }
         } ->
           {context, in_reply_to_ap_id, in_reply_to_actor}
       end
diff --git a/lib/clacks/worker/federate.ex b/lib/clacks/worker/federate.ex
index 008af08..1d19e0d 100644
--- a/lib/clacks/worker/federate.ex
+++ b/lib/clacks/worker/federate.ex
@@ -7,9 +7,9 @@ defmodule Clacks.Worker.Federate do
   require Logger
 
   def perform(%{"id" => activity_id, "actor_id" => actor_id}, _job) do
-    %Activity{data: activity_data} = Repo.get(Activity, activity_id)
+    activity = Repo.get(Activity, activity_id)
     actor = Repo.get(Actor, actor_id)
 
-    :ok = ActivityPub.Federator.federate_to_followers(activity_data, actor)
+    :ok = ActivityPub.Federator.federate_to_involved(activity, actor)
   end
 end
diff --git a/lib/clacks/worker/send_webmention.ex b/lib/clacks/worker/send_webmention.ex
index 4d77149..2839879 100644
--- a/lib/clacks/worker/send_webmention.ex
+++ b/lib/clacks/worker/send_webmention.ex
@@ -6,10 +6,7 @@ defmodule Clacks.Worker.SendWebmention do
   require Logger
 
   @spec enqueue_for_activity(Activity.t()) :: :ok
-  def enqueue_for_activity(
-        %Activity{data: %{"type" => "Create", "object" => %{"content" => content} = note}} =
-          activity
-      ) do
+  def enqueue_for_activity(%Activity{object: %{"content" => content} = note} = activity) do
     tags = Map.get(note, "tag", [])
     tag_hrefs = Enum.map(tags, fn %{"href" => href} -> href end)
 
diff --git a/lib/clacks_web/controllers/frontend_controller.ex b/lib/clacks_web/controllers/frontend_controller.ex
index 7e59561..d5d7292 100644
--- a/lib/clacks_web/controllers/frontend_controller.ex
+++ b/lib/clacks_web/controllers/frontend_controller.ex
@@ -57,16 +57,12 @@ defmodule ClacksWeb.FrontendController do
 
     with %Activity{
            local: true,
-           data:
-             %{
-               "type" => "Create",
-               "object" => %{"type" => "Note", "attributedTo" => author_id}
-             } = data
-         } = activity <- Activity.get(id),
+           object: %Object{data: %{"type" => "Note", "attributedTo" => author_id}}
+         } = activity <- Activity.get(id, with_object: true),
          %Actor{} = author <- Actor.get_by_ap_id(author_id) do
       case conn.assigns[:format] do
         "activity+json" ->
-          json(conn, data)
+          json(conn, Activity.data_with_object(activity))
 
         "html" ->
           render(conn, "status.html", %{
@@ -177,7 +173,7 @@ defmodule ClacksWeb.FrontendController do
           redirect(conn, to: ClacksWeb.FrontendView.local_actor_link(followee))
         else
           follow = ActivityPub.follow(current_user.actor.ap_id, followee.ap_id)
-          ActivityPub.Helper.save_and_federate(follow, current_user.actor)
+          {:ok, _activity} = ActivityPub.Helper.save_and_federate(follow, current_user.actor)
 
           conn
           |> put_flash(:info, "Follow request sent")
@@ -235,7 +231,7 @@ defmodule ClacksWeb.FrontendController do
     status_results =
       with %Activity{
              actor: actor_id,
-             data: %{"type" => "Create", "object" => %{"type" => "Note"}}
+             object: %Object{}
            } = activity <- Object.fetch(q, true, :activity),
            actor <- Actor.get_by_ap_id(actor_id) do
         [{activity, actor}]
diff --git a/lib/clacks_web/templates/frontend/_timeline.html.eex b/lib/clacks_web/templates/frontend/_timeline.html.eex
index 672afe2..cf112ce 100644
--- a/lib/clacks_web/templates/frontend/_timeline.html.eex
+++ b/lib/clacks_web/templates/frontend/_timeline.html.eex
@@ -10,9 +10,9 @@
     <li>
       <%= if status.data["type"] == "Announce" do %>
         <% {announced_status, announced_actor} = announced %>
-        <%= render "_action_status.html", conn: @conn, action: :announce, action_activity: status, action_actor: author, original_activity: announced_status, original_note: announced_status.data["object"], original_actor: announced_actor %>
+        <%= render "_action_status.html", conn: @conn, action: :announce, action_activity: status, action_actor: author, original_activity: announced_status, original_note: announced_status.object.data, original_actor: announced_actor %>
       <% else %>
-        <%= render "_status.html", conn: @conn, author: author, status: status, note: status.data["object"] %>
+        <%= render "_status.html", conn: @conn, author: author, status: status, note: status.object.data %>
       <% end %>
     </li>
   <% end %>
diff --git a/lib/clacks_web/templates/frontend/search.html.eex b/lib/clacks_web/templates/frontend/search.html.eex
index d3e8099..93859d7 100644
--- a/lib/clacks_web/templates/frontend/search.html.eex
+++ b/lib/clacks_web/templates/frontend/search.html.eex
@@ -26,6 +26,6 @@
   <hr>
 
   <%= for {status, author} <- @status_results do %>
-    <%= render "_status.html", conn: @conn, author: author, status: status, note: status.data["object"] %>
+    <%= render "_status.html", conn: @conn, author: author, status: status, note: status.object.data %>
   <% end %>
 <% end %>
diff --git a/lib/clacks_web/templates/frontend/status.html.eex b/lib/clacks_web/templates/frontend/status.html.eex
index c0efd2b..1ec6399 100644
--- a/lib/clacks_web/templates/frontend/status.html.eex
+++ b/lib/clacks_web/templates/frontend/status.html.eex
@@ -1,8 +1,8 @@
-<%= render "_status.html", conn: @conn, author: @author, status: @status, note: @status.data["object"] %>
+<%= render "_status.html", conn: @conn, author: @author, status: @status, note: @status.object.data %>
 
 <%= unless is_nil(@current_user) do %>
   <hr>
 
-  <%= render "_post_form.html", conn: @conn, in_reply_to: @status.data["object"]["id"], placeholder: "Reply", content: mentions_for_replying_to(@conn, @status) %>
+  <%= render "_post_form.html", conn: @conn, in_reply_to: @status.object.data["id"], placeholder: "Reply", content: mentions_for_replying_to(@conn, @status) %>
   <hr>
 <% end %>
diff --git a/lib/clacks_web/views/frontend_view.ex b/lib/clacks_web/views/frontend_view.ex
index 62c266b..48b9acc 100644
--- a/lib/clacks_web/views/frontend_view.ex
+++ b/lib/clacks_web/views/frontend_view.ex
@@ -1,6 +1,6 @@
 defmodule ClacksWeb.FrontendView do
   use ClacksWeb, :view
-  alias Clacks.{Actor, Activity, Repo, Notification}
+  alias Clacks.{Actor, Activity, Repo, Notification, Object}
   alias ClacksWeb.Router.Helpers, as: Routes
   alias ClacksWeb.Endpoint
   require Logger
@@ -98,7 +98,7 @@ defmodule ClacksWeb.FrontendView do
 
   @spec mentions_for_replying_to(Activity.t()) :: String.t()
   defp mentions_for_replying_to(conn, %Activity{
-         data: %{"object" => %{"actor" => actor, "tag" => tags}}
+         object: %Object{data: %{"actor" => actor, "tag" => tags}}
        }) do
     current_user = conn.assigns[:user] |> Repo.preload(:actor)
 
@@ -135,10 +135,7 @@ defmodule ClacksWeb.FrontendView do
 
   @spec render_status_content(activity :: Activity.t()) :: String.t()
   defp render_status_content(%Activity{
-         data: %{
-           "type" => "Create",
-           "object" => %{"type" => "Note", "content" => content} = note
-         }
+         object: %Object{data: %{"type" => "Note", "content" => content} = note}
        }) do
     with %{"tag" => tags} <- note,
          {:ok, tree} <- Floki.parse_fragment(content) do