Implement mastodon api for showing edit history

lib/pleroma/object.ex

@@ -425,4 +425,24 @@ def object_data_hashtags(%{"tag" => tags}) when is_list(tags) do
   end
 
   def object_data_hashtags(_), do: []
+
+  def history_for(object) do
+    with history <- Map.get(object, "formerRepresentations"),
+         true <- is_map(history),
+         "OrderedCollection" <- Map.get(history, "type"),
+         true <- is_list(Map.get(history, "orderedItems")),
+         true <- is_integer(Map.get(history, "totalItems")) do
+      history
+    else
+      _ -> history_skeleton()
+    end
+  end
+
+  defp history_skeleton do
+    %{
+      "type" => "OrderedCollection",
+      "totalItems" => 0,
+      "orderedItems" => []
+    }
+  end
 end

lib/pleroma/web/activity_pub/side_effects.ex

@@ -410,26 +410,6 @@ defp handle_update_user(
     {:ok, object, meta}
   end
 
-  defp history_for_object(object) do
-    with history <- Map.get(object, "formerRepresentations"),
-         true <- is_map(history),
-         "OrderedCollection" <- Map.get(history, "type"),
-         true <- is_list(Map.get(history, "orderedItems")),
-         true <- is_integer(Map.get(history, "totalItems")) do
-      history
-    else
-      _ -> history_skeleton()
-    end
-  end
-
-  defp history_skeleton do
-    %{
-      "type" => "OrderedCollection",
-      "totalItems" => 0,
-      "orderedItems" => []
-    }
-  end
-
   @updatable_object_types ["Note", "Question"]
   # We do not allow poll options to be changed, but the poll description can be.
   @updatable_fields [
@@ -468,7 +448,7 @@ defp maybe_update_history(updated_object, orig_object_data, updated) do
     else
       # Put edit history
       # Note that we may have got the edit history by first fetching the object
-      history = history_for_object(orig_object_data)
+      history = Object.history_for(orig_object_data)
 
       latest_history_item =
         orig_object_data

lib/pleroma/web/api_spec/operations/status_operation.ex

@@ -6,9 +6,13 @@ defmodule Pleroma.Web.ApiSpec.StatusOperation do
   alias OpenApiSpex.Operation
   alias OpenApiSpex.Schema
   alias Pleroma.Web.ApiSpec.AccountOperation
+  alias Pleroma.Web.ApiSpec.Schemas.Account
   alias Pleroma.Web.ApiSpec.Schemas.ApiError
+  alias Pleroma.Web.ApiSpec.Schemas.Attachment
   alias Pleroma.Web.ApiSpec.Schemas.BooleanLike
+  alias Pleroma.Web.ApiSpec.Schemas.Emoji
   alias Pleroma.Web.ApiSpec.Schemas.FlakeID
+  alias Pleroma.Web.ApiSpec.Schemas.Poll
   alias Pleroma.Web.ApiSpec.Schemas.ScheduledStatus
   alias Pleroma.Web.ApiSpec.Schemas.Status
   alias Pleroma.Web.ApiSpec.Schemas.VisibilityScope
@@ -434,6 +438,29 @@ def bookmarks_operation do
     }
   end
 
+  def show_history_operation do
+    %Operation{
+      tags: ["Retrieve status history"],
+      summary: "Status history",
+      description: "View history of a status",
+      operationId: "StatusController.show_history",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        id_param()
+      ],
+      responses: %{
+        200 => status_history_response(),
+        404 => Operation.response("Not Found", "application/json", ApiError)
+      }
+    }
+  end
+
+  def show_source_operation do
+  end
+
+  def update_operation do
+  end
+
   def array_of_statuses do
     %Schema{type: :array, items: Status, example: [Status.schema().example]}
   end
@@ -579,6 +606,61 @@ defp status_response do
     Operation.response("Status", "application/json", Status)
   end
 
+  defp status_history_response do
+    Operation.response(
+      "Status History",
+      "application/json",
+      %Schema{
+        title: "Status history",
+        description: "Response schema for history of a status",
+        type: :array,
+        items: %Schema{
+          type: :object,
+          properties: %{
+            account: %Schema{
+              allOf: [Account],
+              description: "The account that authored this status"
+            },
+            content: %Schema{
+              type: :string,
+              format: :html,
+              description: "HTML-encoded status content"
+            },
+            sensitive: %Schema{
+              type: :boolean,
+              description: "Is this status marked as sensitive content?"
+            },
+            spoiler_text: %Schema{
+              type: :string,
+              description:
+                "Subject or summary line, below which status content is collapsed until expanded"
+            },
+            created_at: %Schema{
+              type: :string,
+              format: "date-time",
+              description: "The date when this status was created"
+            },
+            media_attachments: %Schema{
+              type: :array,
+              items: Attachment,
+              description: "Media that is attached to this status"
+            },
+            emojis: %Schema{
+              type: :array,
+              items: Emoji,
+              description: "Custom emoji to be used when rendering status content"
+            },
+            poll: %Schema{
+              allOf: [Poll],
+              nullable: true,
+              description: "The poll attached to the status"
+            }
+          }
+        }
+      }
+    )
+  end
+
   defp context do
     %Schema{
       title: "StatusContext",

lib/pleroma/web/mastodon_api/controllers/status_controller.ex

@@ -38,7 +38,9 @@ defmodule Pleroma.Web.MastodonAPI.StatusController do
            :index,
            :show,
            :card,
-           :context
+           :context,
+           :show_history,
+           :show_source
          ]
   )
 
@@ -49,7 +51,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusController do
            :create,
            :delete,
            :reblog,
-           :unreblog
+           :unreblog,
+           :update
          ]
   )
 
@@ -191,6 +194,29 @@ def create(%{assigns: %{user: _user}, body_params: %{media_ids: _} = params} = c
     create(%Plug.Conn{conn | body_params: params}, %{})
   end
 
+  @doc "GET /api/v1/statuses/:id/history"
+  def show_history(%{assigns: %{user: user}} = conn, %{id: id} = params) do
+    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
+         true <- Visibility.visible_for_user?(activity, user) do
+      try_render(conn, "history.json",
+        activity: activity,
+        for: user,
+        with_direct_conversation_id: true,
+        with_muted: Map.get(params, :with_muted, false)
+      )
+    else
+      _ -> {:error, :not_found}
+    end
+  end
+
+  @doc "GET /api/v1/statuses/:id/source"
+  def show_source(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  end
+
+  @doc "PUT /api/v1/statuses/:id"
+  def update(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  end
+
   @doc "GET /api/v1/statuses/:id"
   def show(%{assigns: %{user: user}} = conn, %{id: id} = params) do
     with %Activity{} = activity <- Activity.get_by_id_with_object(id),

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -384,6 +384,71 @@ def render("show.json", _) do
     nil
   end
 
+  def render("history.json", %{activity: %{data: %{"object" => _object}} = activity} = opts) do
+    object = Object.normalize(activity, fetch: false)
+
+    hashtags = Object.hashtags(object)
+
+    user = CommonAPI.get_user(activity.data["actor"])
+
+    past_history =
+      Object.history_for(object.data)
+      |> Map.get("orderedItems")
+      |> Enum.map(&Map.put(&1, "id", object.data["id"]))
+      |> Enum.map(&%Object{data: &1, id: object.id})
+
+    history = [object | past_history]
+
+    individual_opts =
+      opts
+      |> Map.put(:as, :object)
+      |> Map.put(:user, user)
+      |> Map.put(:hashtags, hashtags)
+
+    render_many(history, StatusView, "history_item.json", individual_opts)
+  end
+
+  def render(
+        "history_item.json",
+        %{activity: activity, user: user, object: object, hashtags: hashtags} = opts
+      ) do
+    sensitive = object.data["sensitive"] || Enum.member?(hashtags, "nsfw")
+
+    attachment_data = object.data["attachment"] || []
+    attachments = render_many(attachment_data, StatusView, "attachment.json", as: :attachment)
+
+    created_at = Utils.to_masto_date(object.data["updated"] || object.data["published"])
+
+    content =
+      object
+      |> render_content()
+
+    content_html =
+      content
+      |> Activity.HTML.get_cached_scrubbed_html_for_activity(
+        User.html_filter_policy(opts[:for]),
+        activity,
+        "mastoapi:content"
+      )
+
+    summary = object.data["summary"] || ""
+
+    %{
+      account:
+        AccountView.render("show.json", %{
+          user: user,
+          for: opts[:for]
+        }),
+      content: content_html,
+      sensitive: sensitive,
+      spoiler_text: summary,
+      created_at: created_at,
+      media_attachments: attachments,
+      emojis: build_emojis(object.data["emoji"]),
+      poll: render(PollView, "show.json", object: object, for: opts[:for])
+    }
+  end
+
   def render("card.json", %{rich_media: rich_media, page_url: page_url}) do
     page_url_data = URI.parse(page_url)
 

lib/pleroma/web/router.ex

@@ -552,6 +552,9 @@ defmodule Pleroma.Web.Router do
     get("/bookmarks", StatusController, :bookmarks)
 
     post("/statuses", StatusController, :create)
+    get("/statuses/:id/history", StatusController, :show_history)
+    get("/statuses/:id/source", StatusController, :show_source)
+    put("/statuses/:id", StatusController, :update)
     delete("/statuses/:id", StatusController, :delete)
     post("/statuses/:id/reblog", StatusController, :reblog)
     post("/statuses/:id/unreblog", StatusController, :unreblog)

test/pleroma/web/mastodon_api/controllers/status_controller_test.exs

@@ -1990,4 +1990,50 @@ test "show" do
              } = result
     end
   end
+
+  describe "get status history" do
+    setup do
+      oauth_access(["read:statuses"])
+    end
+
+    test "unedited post", %{conn: conn} do
+      activity = insert(:note_activity)
+
+      conn = get(conn, "/api/v1/statuses/#{activity.id}/history")
+
+      assert [_] = json_response_and_validate_schema(conn, 200)
+    end
+
+    test "edited post", %{conn: conn} do
+      note =
+        insert(
+          :note,
+          data: %{
+            "formerRepresentations" => %{
+              "type" => "OrderedCollection",
+              "orderedItems" => [
+                %{
+                  "type" => "Note",
+                  "content" => "mew mew 2",
+                  "summary" => "title 2"
+                },
+                %{
+                  "type" => "Note",
+                  "content" => "mew mew 1",
+                  "summary" => "title 1"
+                }
+              ],
+              "totalItems" => 2
+            }
+          }
+        )
+
+      activity = insert(:note_activity, note: note)
+
+      conn = get(conn, "/api/v1/statuses/#{activity.id}/history")
+
+      assert [_, %{"spoiler_text" => "title 2"}, %{"spoiler_text" => "title 1"}] =
+               json_response_and_validate_schema(conn, 200)
+    end
+  end
 end