Merge pull request #103 from epochtalk/move-thread

Move thread

Author: unenglishable

lib/epochtalk_server/models/board.ex

@@ -124,8 +124,8 @@ defmodule EpochtalkServer.Models.Board do
   Creates a new `Board` in the database
   """
   @spec create(board_attrs :: map()) :: {:ok, board :: t()} | {:error, Ecto.Changeset.t()}
-  def create(board) do
-    board_cs = create_changeset(%Board{}, board)
+  def create(board_attrs) do
+    board_cs = create_changeset(%Board{}, board_attrs)
 
     case Repo.insert(board_cs) do
       {:ok, db_board} ->

lib/epochtalk_server/models/board_mapping.ex

@@ -112,7 +112,18 @@ defmodule EpochtalkServer.Models.BoardMapping do
           left_join: s in subquery(sticky_count_subquery),
           on: bm.board_id == s.board_id,
           select_merge: %{
-            stats: mb,
+            stats: %{
+              board_id: mb.board_id,
+              post_count: mb.post_count,
+              thread_count: mb.thread_count,
+              total_post: mb.total_post,
+              total_thread_count: mb.total_thread_count,
+              last_post_username: mb.last_post_username,
+              last_post_created_at: mb.last_post_created_at,
+              last_thread_id: mb.last_thread_id,
+              last_thread_title: mb.last_thread_title,
+              last_post_position: mb.last_post_position
+            },
             thread: %{
               last_thread_slug: t.slug,
               last_thread_post_count: t.post_count,

lib/epochtalk_server/models/category.ex

@@ -69,7 +69,7 @@ defmodule EpochtalkServer.Models.Category do
       |> Map.put(:updated_at, now)
 
     category
-    |> cast(attrs, [:name, :viewable_by, :created_at, :updated_at])
+    |> cast(attrs, [:name, :view_order, :viewable_by, :postable_by, :created_at, :updated_at])
   end
 
   @doc """
@@ -79,7 +79,7 @@ defmodule EpochtalkServer.Models.Category do
           Ecto.Changeset.t()
   def update_for_board_mapping_changeset(category, attrs) do
     category
-    |> cast(attrs, [:id, :name, :view_order, :viewable_by])
+    |> cast(attrs, [:id, :name, :view_order, :viewable_by, :postable_by])
     |> unique_constraint(:id, name: :categories_pkey)
   end
 

lib/epochtalk_server/models/metadata_board.ex

@@ -1,8 +1,12 @@
 defmodule EpochtalkServer.Models.MetadataBoard do
   use Ecto.Schema
   import Ecto.Changeset
+  import Ecto.Query
   alias EpochtalkServer.Repo
   alias EpochtalkServer.Models.Board
+  alias EpochtalkServer.Models.Post
+  alias EpochtalkServer.Models.Thread
+  alias EpochtalkServer.Models.User
   alias EpochtalkServer.Models.MetadataBoard
 
   @moduledoc """
@@ -85,4 +89,67 @@ defmodule EpochtalkServer.Models.MetadataBoard do
   @spec insert(metadata_board :: t()) ::
           {:ok, metadata_board :: t()} | {:error, Ecto.Changeset.t()}
   def insert(%MetadataBoard{} = metadata_board), do: Repo.insert(metadata_board)
+
+  @doc """
+  Queries then updates `MetadataBoard` info for the specified Board`
+  """
+  @spec update_last_post_info(metadata_board :: t(), board_id :: non_neg_integer) :: t()
+  def update_last_post_info(metadata_board, board_id) do
+    # query most recent post in thread and it's authoring user's data
+    last_post_subquery =
+      from t in Thread,
+        left_join: p in Post,
+        on: t.id == p.thread_id,
+        left_join: u in User,
+        on: u.id == p.user_id,
+        where: t.board_id == ^board_id,
+        order_by: [desc: p.created_at],
+        select: %{
+          thread_id: p.thread_id,
+          created_at: p.created_at,
+          username: u.username,
+          position: p.position
+        }
+
+    # query most recent thread in board, join last post subquery
+    last_post_query =
+      from t in Thread,
+        left_join: p in Post,
+        on: p.thread_id == t.id,
+        left_join: lp in subquery(last_post_subquery),
+        on: p.thread_id == lp.thread_id,
+        where: t.board_id == ^board_id,
+        order_by: [desc: t.created_at],
+        limit: 1,
+        select: %{
+          board_id: t.board_id,
+          thread_id: t.id,
+          title: p.content["title"],
+          username: lp.username,
+          created_at: lp.created_at,
+          position: lp.position
+        }
+
+    # update board metadata using queried data
+    updated_metadata_board =
+      if lp = Repo.one(last_post_query) do
+        change(metadata_board,
+          last_post_username: lp.username,
+          last_post_created_at: lp.created_at,
+          last_thread_id: lp.thread_id,
+          last_thread_title: lp.title,
+          last_post_position: lp.position
+        )
+      else
+        change(metadata_board,
+          last_post_username: nil,
+          last_post_created_at: nil,
+          last_thread_id: nil,
+          last_thread_title: nil,
+          last_post_position: nil
+        )
+      end
+
+    Repo.update!(updated_metadata_board)
+  end
 end

lib/epochtalk_server/models/thread.ex

@@ -7,6 +7,7 @@ defmodule EpochtalkServer.Models.Thread do
   alias EpochtalkServer.Models.User
   alias EpochtalkServer.Models.Thread
   alias EpochtalkServer.Models.MetadataThread
+  alias EpochtalkServer.Models.MetadataBoard
   alias EpochtalkServer.Models.Board
   alias EpochtalkServer.Models.Poll
   alias EpochtalkServer.Models.Post
@@ -243,6 +244,89 @@ defmodule EpochtalkServer.Models.Thread do
     end
   end
 
+  @doc """
+  Moves `Thread` to the specified `Board` given a `thread_id` and `board_id`
+  """
+  @spec move(thread_id :: non_neg_integer, board_id :: non_neg_integer) ::
+          {:ok, thread :: t()} | {:error, Ecto.Changeset.t()}
+  def move(thread_id, board_id) do
+    case Repo.transaction(fn ->
+           # query and lock thread for update,
+           thread_lock_query =
+             from t in Thread,
+               where: t.id == ^thread_id,
+               select: t,
+               lock: "FOR UPDATE"
+
+           thread = Repo.one(thread_lock_query)
+
+           # prevent moving board to same board or non existent board
+           if thread.board_id != board_id && Repo.get_by(Board, id: board_id) != nil do
+             # query old board and lock for update
+             old_board_lock_query =
+               from b in Board,
+                 join: mb in MetadataBoard,
+                 on: mb.board_id == b.id,
+                 where: b.id == ^thread.board_id,
+                 select: {b, mb},
+                 lock: "FOR UPDATE"
+
+             # locked old_board, reference this when updating
+             {old_board, old_board_meta} = Repo.one(old_board_lock_query)
+
+             # query new board and lock for update
+             new_board_lock_query =
+               from b in Board,
+                 join: mb in MetadataBoard,
+                 on: mb.board_id == b.id,
+                 where: b.id == ^board_id,
+                 select: {b, mb},
+                 lock: "FOR UPDATE"
+
+             # locked new_board, reference this when updating
+             {new_board, new_board_meta} = Repo.one(new_board_lock_query)
+
+             # update old_board, thread and post count
+             old_board
+             |> change(
+               thread_count: old_board.thread_count - 1,
+               post_count: old_board.post_count - thread.post_count
+             )
+             |> Repo.update!()
+
+             # update new_board, thread and post count
+             new_board
+             |> change(
+               thread_count: new_board.thread_count + 1,
+               post_count: new_board.post_count + thread.post_count
+             )
+             |> Repo.update!()
+
+             # update thread's original board_id with new_board's id
+             thread
+             |> change(board_id: new_board.id)
+             |> Repo.update!()
+
+             # update last post metadata info of both the old board and new board
+             MetadataBoard.update_last_post_info(old_board_meta, old_board.id)
+             MetadataBoard.update_last_post_info(new_board_meta, new_board.id)
+
+             # return old board data for reference
+             %{old_board_name: old_board.name, old_board_id: old_board.id}
+           else
+             Repo.rollback(:invalid_board_id)
+           end
+         end) do
+      # transaction success return purged thread data
+      {:ok, thread_data} ->
+        {:ok, thread_data}
+
+      # some other error
+      {:error, cs} ->
+        {:error, cs}
+    end
+  end
+
   @doc """
   Sets boolean indicating if the specified `Thread` is sticky given a `Thread` id
   """

lib/epochtalk_server_web/controllers/thread.ex

@@ -512,6 +512,67 @@ defmodule EpochtalkServerWeb.Controllers.Thread do
     end
   end
 
+  @doc """
+  Used to move a `Thread`
+  """
+  def move(conn, attrs) do
+    with user <- Guardian.Plug.current_resource(conn),
+         thread_id <- Validate.cast(attrs, "thread_id", :integer, required: true),
+         new_board_id <- Validate.cast(attrs, "new_board_id", :integer, required: true),
+         :ok <- ACL.allow!(conn, "threads.move"),
+         user_priority <- ACL.get_user_priority(conn),
+         {:can_read, {:ok, true}} <-
+           {:can_read, Board.get_read_access_by_thread_id(thread_id, user_priority)},
+         {:can_write, {:ok, true}} <-
+           {:can_write, Board.get_write_access_by_thread_id(thread_id, user_priority)},
+         {:is_active, true} <-
+           {:is_active, User.is_active?(user.id)},
+         {:board_banned, {:ok, false}} <-
+           {:board_banned, BoardBan.banned_from_board?(user, thread_id: thread_id)},
+         {:bypass_thread_owner, true} <-
+           {:bypass_thread_owner, can_authed_user_bypass_owner_on_thread_move(user, thread_id)},
+         {:ok, old_board_data} <- Thread.move(thread_id, new_board_id) do
+      render(conn, :move, old_board_data: old_board_data)
+    else
+      {:can_read, {:ok, false}} ->
+        ErrorHelpers.render_json_error(
+          conn,
+          403,
+          "Unauthorized, you do not have permission to read"
+        )
+
+      {:can_write, {:ok, false}} ->
+        ErrorHelpers.render_json_error(
+          conn,
+          403,
+          "Unauthorized, you do not have permission to write"
+        )
+
+      {:bypass_thread_owner, false} ->
+        ErrorHelpers.render_json_error(
+          conn,
+          403,
+          "Unauthorized, you do not have permission to move another user's thread"
+        )
+
+      {:board_banned, {:ok, true}} ->
+        ErrorHelpers.render_json_error(conn, 403, "Unauthorized, you are banned from this board")
+
+      {:is_active, false} ->
+        ErrorHelpers.render_json_error(
+          conn,
+          400,
+          "Account must be active to move thread"
+        )
+
+      {:error, data} ->
+        ErrorHelpers.render_json_error(conn, 400, data)
+
+      _ ->
+        ErrorHelpers.render_json_error(conn, 400, "Error, cannot move thread")
+    end
+  end
+
   @doc """
   Used to convert `Thread` slug to id
   """
@@ -685,4 +746,18 @@ defmodule EpochtalkServerWeb.Controllers.Thread do
       true
     )
   end
+
+  defp can_authed_user_bypass_owner_on_thread_move(user, thread_id) do
+    post = Thread.get_first_post_data_by_id(thread_id)
+
+    ACL.bypass_post_owner(
+      user,
+      post,
+      "threads.move",
+      "owner",
+      false,
+      true,
+      true
+    )
+  end
 end

lib/epochtalk_server_web/json/board_json.ex

@@ -90,9 +90,9 @@ defmodule EpochtalkServerWeb.Controllers.BoardJSON do
     # flatten needed boards data
     board =
       board
-      |> Map.merge(to_map_remove_nil(board.board))
+      |> Map.merge(remove_nil(board.board))
       |> Map.merge(
-        to_map_remove_nil(board.stats)
+        remove_nil(board.stats)
         |> Map.delete(:id)
       )
       |> Map.merge(board.thread)
@@ -157,8 +157,8 @@ defmodule EpochtalkServerWeb.Controllers.BoardJSON do
         # flatten needed boards data
         board =
           board
-          |> Map.merge(to_map_remove_nil(board.board))
-          |> Map.merge(to_map_remove_nil(board.stats))
+          |> Map.merge(remove_nil(board.board))
+          |> Map.merge(remove_nil(board.stats))
           |> Map.merge(board.thread)
 
         # delete unneeded properties
@@ -204,11 +204,16 @@ defmodule EpochtalkServerWeb.Controllers.BoardJSON do
     parent
   end
 
-  defp to_map_remove_nil(nil), do: %{}
+  defp remove_nil(nil), do: %{}
 
-  defp to_map_remove_nil(struct) do
+  defp remove_nil(struct) when is_struct(struct) do
     struct
     |> Map.from_struct()
+    |> remove_nil()
+  end
+
+  defp remove_nil(map) when is_map(map) do
+    map
     |> Enum.reject(fn {_, v} -> is_nil(v) end)
     |> Map.new()
   end

lib/epochtalk_server_web/json/thread_json.ex

@@ -140,6 +140,19 @@ defmodule EpochtalkServerWeb.Controllers.ThreadJSON do
   def purge(%{thread: thread}),
     do: thread
 
+  @doc """
+  Renders move `Thread`.
+
+    iex> old_board_data = %{
+    iex>   old_board_id: 2,
+    iex>   old_board_name: "General Discussion"
+    iex> }
+    iex> EpochtalkServerWeb.Controllers.ThreadJSON.move(%{old_board_data: old_board_data})
+    old_board_data
+  """
+  def move(%{old_board_data: old_board_data}),
+    do: old_board_data
+
   @doc """
   Renders `Thread` id for slug to id route.
   """

lib/epochtalk_server_web/router.ex

@@ -48,6 +48,7 @@ defmodule EpochtalkServerWeb.Router do
     post "/threads", Thread, :create
     post "/threads/:thread_id/lock", Thread, :lock
     post "/threads/:thread_id/sticky", Thread, :sticky
+    post "/threads/:thread_id/move", Thread, :move
     delete "/threads/:thread_id", Thread, :purge
     post "/threads/:thread_id/polls/vote", Poll, :vote
     delete "/threads/:thread_id/polls/vote", Poll, :delete_vote