Add replying to statuses

lib/clacks/activitypub.ex

@@ -32,6 +32,7 @@ defmodule Clacks.ActivityPub do
           actor :: String.t(),
           html :: String.t(),
           context :: String.t() | nil,
+          in_reply_to :: String.t() | nil,
           id :: String.t() | nil,
           published :: DateTime.t(),
           to :: [String.t()],
@@ -41,6 +42,7 @@ defmodule Clacks.ActivityPub do
         actor,
         html,
         context \\ nil,
+        in_reply_to \\ nil,
         id \\ nil,
         published \\ DateTime.utc_now(),
         to \\ [@public],
@@ -61,6 +63,7 @@ defmodule Clacks.ActivityPub do
       "content" => html,
       "conversation" => context,
       "context" => context,
+      "inReplyTo" => in_reply_to,
       "published" => published |> DateTime.to_iso8601()
     }
   end

lib/clacks_web/controllers/activities_controller.ex

@@ -18,7 +18,27 @@ defmodule ClacksWeb.ActivitiesController do
         end
 
       _ ->
-        resp(conn, 404, "Not Found")
+        case conn.assigns[:format] do
+          "activity+json" ->
+            conn
+            |> put_status(404)
+            |> json(%{error: "Not Found"})
+
+          "html" ->
+            resp(conn, 404, "Not Found")
+        end
+    end
+  end
+
+  def get_status(conn, %{"id" => status_id}) do
+    case Activity.get(status_id) do
+      %Activity{local: true, data: data} ->
+        json(conn, data)
+
+      _ ->
+        conn
+        |> put_status(404)
+        |> json(%{error: "Not Found"})
     end
   end
 end

lib/clacks_web/controllers/frontend_controller.ex

@@ -4,6 +4,8 @@ defmodule ClacksWeb.FrontendController do
   alias ClacksWeb.Router.Helpers, as: Routes
   alias ClacksWeb.Endpoint
 
+  @public "https://www.w3.org/ns/activitystreams#Public"
+
   def index(%Plug.Conn{assigns: %{user: user}} = conn, params) do
     user = Repo.preload(user, :actor)
 
@@ -48,23 +50,67 @@ defmodule ClacksWeb.FrontendController do
 
     with %Activity{
            local: true,
+           data:
+             %{
+               "type" => "Create",
+               "object" => %{"type" => "Note", "attributedTo" => author_id} = note
+             } = data
+         } <- Activity.get(id),
+         %Actor{} = author <- Actor.get_by_ap_id(author_id) do
+      case conn.assigns[:format] do
+        "activity+json" ->
+          json(conn, data)
+
+        "html" ->
+          render(conn, "status.html", %{
+            current_user: current_user,
+            note: note,
+            author: author
+          })
+      end
+    else
+      nil ->
+        case conn.assigns[:format] do
+          "activity+json" ->
+            conn
+            |> put_status(404)
+            |> json(%{error: "Not Found"})
+
+          "html" ->
+            resp(conn, 404, "Not Found")
+        end
+
+      %Activity{local: false, data: %{"id" => ap_id}} ->
+        case conn.assigns[:format] do
+          "activity+json" ->
+            conn
+            |> put_status(404)
+            |> json(%{error: "Not Found"})
+
+          "html" ->
+            redirect(conn, external: ap_id)
+        end
+    end
+  end
+
+  def reply(conn, %{"id" => id}) do
+    current_user = conn.assigns[:user]
+
+    with %Activity{
            data: %{
              "type" => "Create",
              "object" => %{"type" => "Note", "attributedTo" => author_id} = note
            }
          } <- Activity.get(id),
          %Actor{} = author <- Actor.get_by_ap_id(author_id) do
-      render(conn, "status.html", %{
+      render(conn, "reply.html", %{
         current_user: current_user,
         note: note,
         author: author
       })
     else
-      nil ->
-        put_status(conn, 404)
-
-      %Activity{local: false, data: %{"id" => ap_id}} ->
-        redirect(conn, external: ap_id)
+      _ ->
+        resp(conn, 404, "Not Found")
     end
   end
 
@@ -89,7 +135,7 @@ defmodule ClacksWeb.FrontendController do
   def post_status(conn, %{"content" => content} = params) do
     current_user = conn.assigns[:user] |> Repo.preload(:actor)
 
-    note = ActivityPub.note(current_user.actor.ap_id, content)
+    note = note_for_posting(current_user, params)
     note_changeset = Object.changeset_for_creating(note)
     {:ok, object} = Repo.insert(note_changeset)
 
@@ -104,4 +150,31 @@ defmodule ClacksWeb.FrontendController do
     path = Map.get(params, "continue", Routes.frontend_path(Endpoint, :status, activity.id))
     redirect(conn, to: path)
   end
+
+  defp note_for_posting(current_user, %{"content" => content, "in_reply_to" => in_reply_to_ap_id}) do
+    with %Activity{data: %{"context" => context, "actor" => in_reply_to_actor}} <-
+           Activity.get_by_ap_id(in_reply_to_ap_id) do
+      to = [in_reply_to_actor, @public]
+      # todo: followers
+      cc = []
+
+      ActivityPub.note(
+        current_user.actor.ap_id,
+        content,
+        context,
+        in_reply_to_ap_id,
+        nil,
+        DateTime.utc_now(),
+        to,
+        cc
+      )
+    else
+      _ ->
+        ActivityPub.note(current_user.actor.ap_id, content)
+    end
+  end
+
+  defp note_for_posting(current_user, %{"content" => content}) do
+    ActivityPub.note(current_user.actor.ap_id, content)
+  end
 end

lib/clacks_web/router.ex

@@ -51,13 +51,13 @@ defmodule ClacksWeb.Router do
     pipe_through :browser_maybe_authenticated
 
     get "/", FrontendController, :index
-    get "/status/:id", FrontendController, :status
-    post "/post", FrontendController, :post_status
   end
 
   scope "/", ClacksWeb do
     pipe_through :browser
     pipe_through :browser_authenticated
+
+    post "/post", FrontendController, :post_status
   end
 
   scope "/", ClacksWeb do
@@ -80,6 +80,7 @@ defmodule ClacksWeb.Router do
     get "/users/:username", ActorController, :get
     get "/activities/:id", ActivitiesController, :get
     get "/objects/:id", ObjectsController, :get
+    get "/status/:id", FrontendController, :status
   end
 
   # Other scopes may use custom stacks.

lib/clacks_web/templates/frontend/_status.html.eex

@@ -9,6 +9,7 @@
       <%= @author.data["name"] %>
     </a>
   </h3>
+  <a href="<%= @note["url"] %>">Permalink</a>
   <div class="status-content">
     <%= @note["content"] %>
   </div>

lib/clacks_web/templates/frontend/status.html.eex

@@ -1 +1,9 @@
 <%= render "_status.html", author: @author, note: @note %>
+
+<hr>
+
+<%= form_tag Routes.frontend_path(@conn, :post_status), method: :post do %>
+  <input type="hidden" name="in_reply_to" value="<%= @note["id"] %>">
+  <textarea id="content" name="content" cols="30" rows="10" placeholder="Reply"></textarea>
+  <%= submit "Post" %>
+<% end %>