231 lines
6.9 KiB
Elixir
231 lines
6.9 KiB
Elixir
defmodule Mobilizon.Resources do
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@moduledoc """
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The Resources context.
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"""
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alias Ecto.Adapters.SQL
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alias Ecto.Multi
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alias Ecto.UUID
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alias Mobilizon.Actors
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Resources.Resource
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alias Mobilizon.Storage.{Page, Repo}
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import Ecto.Query
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require Logger
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@resource_preloads [:actor, :creator, :children, :parent]
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@doc """
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Returns the list of recent resources for a group
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"""
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@spec get_resources_for_group(Actor.t(), integer | nil, integer | nil) :: Page.t()
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def get_resources_for_group(%Actor{id: group_id}, page \\ nil, limit \\ nil) do
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Resource
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|> where(actor_id: ^group_id)
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|> order_by(desc: :published_at)
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|> preload([r], [:actor, :creator])
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|> Page.build_page(page, limit)
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end
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@doc """
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Returns the list of resources for a resource folder.
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"""
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@spec get_resources_for_folder(Resource.t(), integer | nil, integer | nil) :: Page.t()
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def get_resources_for_folder(resource, page \\ nil, limit \\ nil)
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def get_resources_for_folder(
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%Resource{id: "root_" <> _group_id, actor_id: group_id},
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page,
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limit
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) do
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Resource
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|> where([r], r.actor_id == ^group_id and is_nil(r.parent_id))
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|> order_by(asc: :type, asc: :title)
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|> preload([r], [:actor, :creator])
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|> Page.build_page(page, limit)
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end
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def get_resources_for_folder(%Resource{id: resource_id}, page, limit) do
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Resource
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|> where([r], r.parent_id == ^resource_id)
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|> order_by(asc: :type, asc: :title)
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|> preload([r], [:actor, :creator])
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|> Page.build_page(page, limit)
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end
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@doc """
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Get a resource by it's ID
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"""
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@spec get_resource(integer | String.t()) :: Resource.t() | nil
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def get_resource(nil), do: nil
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def get_resource(id), do: Repo.get(Resource, id)
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@spec get_resource_with_preloads(integer | String.t()) :: Resource.t() | nil
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def get_resource_with_preloads(id) do
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Resource
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|> Repo.get(id)
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|> Repo.preload(@resource_preloads)
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end
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@spec get_resource_by_group_and_path_with_preloads(String.t() | integer, String.t()) ::
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Resource.t() | nil
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def get_resource_by_group_and_path_with_preloads(group_id, "/") do
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with {:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id) do
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%Resource{
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actor_id: group_id,
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id: "root_#{group_id}",
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actor: group,
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path: "/",
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title: "Root"
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}
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end
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end
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def get_resource_by_group_and_path_with_preloads(group_id, path) do
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Resource
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|> Repo.get_by(actor_id: group_id, path: path)
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|> Repo.preload(@resource_preloads)
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end
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@doc """
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Get a resource by it's URL
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"""
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@spec get_resource_by_url(String.t()) :: Resource.t() | nil
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def get_resource_by_url(url), do: Repo.get_by(Resource, url: url)
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@spec get_resource_by_url_with_preloads(String.t()) :: Resource.t() | nil
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def get_resource_by_url_with_preloads(url) do
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Resource
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|> Repo.get_by(url: url)
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|> Repo.preload(@resource_preloads)
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end
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@doc """
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Creates a resource.
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"""
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@spec create_resource(map) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
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def create_resource(attrs \\ %{}) do
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Multi.new()
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|> do_find_parent_path(Map.get(attrs, :parent_id))
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|> Multi.insert(:insert, fn %{find_parent_path: path} ->
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Resource.changeset(
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%Resource{},
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Map.put(attrs, :path, "#{path}/#{String.replace(attrs.title, "/", "")}")
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)
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end)
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|> Repo.transaction()
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|> case do
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{:ok, %{insert: %Resource{} = resource}} ->
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{:ok, resource}
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{:error, operation, reason, _changes} ->
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{:error, "Error while inserting resource when #{operation} because of #{inspect(reason)}"}
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end
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end
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@doc """
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Updates a resource.
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Since a resource can be a folder and hold children, we do the following in a transaction:
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* Get the parent path so that we can reconstruct the path for current resource (if moved or simply renamed)
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* Update all children with the new parent path
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* Update the resource path itself
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"""
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@spec update_resource(Resource.t(), map) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
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def update_resource(%Resource{title: old_title} = resource, attrs) do
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Multi.new()
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|> find_parent_path(resource, attrs)
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|> update_children(resource, attrs)
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|> Multi.update(:update, fn %{find_parent_path: path} ->
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title = Map.get(attrs, :title, old_title)
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Resource.changeset(
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resource,
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Map.put(attrs, :path, "#{path}/#{String.replace(title, "/", "")}")
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)
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end)
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|> Repo.transaction()
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|> case do
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{:ok,
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%{
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find_parent_path: _parent_path,
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update: %Resource{} = resource,
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update_children: children
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}} ->
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resource = Map.put(resource, :children, children)
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{:ok, resource}
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# collect errors into record changesets
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{:error, operation, reason, _changes} ->
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{:error, "Error while updating resource when #{operation} because of #{inspect(reason)}"}
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end
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end
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@spec find_parent_path(Multi.t(), Resource.t(), map()) :: Multi.t()
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defp find_parent_path(
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%Multi{} = multi,
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%Resource{parent_id: old_parent_id} = _resource,
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attrs
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) do
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updated_parent_id = Map.get(attrs, :parent_id, old_parent_id)
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Logger.debug("Finding parent path for updated_parent_id #{inspect(updated_parent_id)}")
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do_find_parent_path(multi, updated_parent_id)
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end
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@spec do_find_parent_path(Multi.t(), String.t() | nil) :: Multi.t()
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defp do_find_parent_path(%Multi{} = multi, nil),
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do: Multi.run(multi, :find_parent_path, fn _, _ -> {:ok, ""} end)
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defp do_find_parent_path(%Multi{} = multi, parent_id) do
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Multi.run(multi, :find_parent_path, fn _repo, _changes ->
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case get_resource(parent_id) do
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%Resource{path: path} = _resource -> {:ok, path}
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_ -> {:error, :not_found}
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end
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end)
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end
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# sobelow_skip ["SQL.Query"]
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@spec update_children(Multi.t(), Resource.t(), map()) :: Multi.t()
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defp update_children(
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%Multi{} = multi,
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%Resource{
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id: id,
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type: :folder,
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title: old_title,
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actor_id: actor_id
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},
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attrs
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) do
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title = Map.get(attrs, :title, old_title)
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Multi.run(multi, :update_children, fn repo, %{find_parent_path: path} ->
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{:ok, uuid} = UUID.dump(id)
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{query, params} =
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{"UPDATE resource SET path = CONCAT($1::text, title) WHERE actor_id = $2 AND parent_id = $3::uuid",
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["#{path}/#{title}/", actor_id, uuid]}
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{:ok, _} =
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SQL.query(
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repo,
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query,
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params
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)
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children = repo.all(from(r in Resource, where: r.parent_id == ^id))
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{:ok, children}
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end)
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end
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defp update_children(multi, _, _),
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do: Multi.run(multi, :update_children, fn _, _ -> {:ok, ""} end)
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@doc """
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Deletes a resource
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"""
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@spec delete_resource(Resource.t()) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
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def delete_resource(%Resource{} = resource), do: Repo.delete(resource)
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end
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