# Portions of this file are derived from Pleroma: # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only # Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/upload.ex defmodule Mobilizon.Web.Upload do @moduledoc """ Manage user uploads Options: * `:type`: presets for activity type (defaults to Document) and size limits from app configuration * `:description`: upload alternative text * `:base_url`: override base url * `:uploader`: override uploader * `:filters`: override filters * `:size_limit`: override size limit * `:activity_type`: override activity type The `%Mobilizon.Web.Upload{}` struct: all documented fields are meant to be overwritten in filters: * `:id` - the upload id. * `:name` - the upload file name. * `:path` - the upload path: set at first to `id/name` but can be changed. Keep in mind that the path is once created permanent and changing it (especially in uploaders) is probably a bad idea! * `:tempfile` - path to the temporary file. Prefer in-place changes on the file rather than changing the path as the temporary file is also tracked by `Plug.Upload{}` and automatically deleted once the request is over. Related behaviors: * `Mobilizon.Web.Upload.Uploader` * `Mobilizon.Web.Upload.Filter` """ alias Ecto.UUID alias Mobilizon.Config alias Mobilizon.Web.Endpoint alias Mobilizon.Web.Upload.{Filter, MIME, Uploader} require Logger @type source :: Plug.Upload.t() | (data_uri_string :: String.t()) | {:from_local, name :: String.t(), id :: String.t(), path :: String.t()} @type option :: {:type, :avatar | :banner | :background} | {:description, String.t()} | {:activity_type, String.t()} | {:size_limit, nil | non_neg_integer()} | {:uploader, module()} | {:filters, [module()]} @type t :: %__MODULE__{ id: String.t(), name: String.t(), tempfile: String.t(), content_type: String.t(), path: String.t(), size: integer() } defstruct [:id, :name, :tempfile, :content_type, :path, :size] @spec store(source, options :: [option()]) :: {:ok, map()} | {:error, any()} def store(upload, opts \\ []) do opts = get_opts(opts) with {:ok, upload} <- prepare_upload(upload, opts), upload = %__MODULE__{upload | path: upload.path || "#{upload.id}/#{upload.name}"}, {:ok, upload} <- Filter.filter(opts.filters, upload), {:ok, url_spec} <- Uploader.put_file(opts.uploader, upload) do {:ok, %{ name: Map.get(opts, :description) || upload.name, url: url_from_spec(upload, opts.base_url, url_spec), content_type: upload.content_type, size: upload.size }} else {:error, error} -> Logger.error( "#{__MODULE__} store (using #{inspect(opts.uploader)}) failed: #{inspect(error)}" ) {:error, error} end end def remove(url, opts \\ []) do with opts <- get_opts(opts), %URI{path: "/media/" <> path, host: host} <- URI.parse(url), {:same_host, true} <- {:same_host, host == Endpoint.host()} do Uploader.remove_file(opts.uploader, path) else %URI{} = _uri -> {:error, "URL doesn't match pattern"} {:same_host, _} -> Logger.error("Media can't be deleted because its URL doesn't match current host") end end def char_unescaped?(char) do URI.char_unreserved?(char) or char == ?/ end defp get_opts(opts) do {size_limit, activity_type} = case Keyword.get(opts, :type) do :banner -> {Config.get!([:instance, :banner_upload_limit]), "Image"} :avatar -> {Config.get!([:instance, :avatar_upload_limit]), "Image"} _ -> {Config.get!([:instance, :upload_limit]), nil} end %{ activity_type: Keyword.get(opts, :activity_type, activity_type), size_limit: Keyword.get(opts, :size_limit, size_limit), uploader: Keyword.get(opts, :uploader, Config.get([__MODULE__, :uploader])), filters: Keyword.get(opts, :filters, Config.get([__MODULE__, :filters])), description: Keyword.get(opts, :description), allow_list_mime_types: Keyword.get( opts, :allow_list_mime_types, Config.get([__MODULE__, :allow_list_mime_types]) ), base_url: Keyword.get( opts, :base_url, Config.get([__MODULE__, :base_url], Endpoint.url()) ) } end defp prepare_upload(%Plug.Upload{} = file, opts) do with {:ok, size} <- check_file_size(file.path, opts.size_limit), {:ok, content_type, name} <- MIME.file_mime_type(file.path, file.filename), :ok <- check_allowed_mime_type(content_type, opts.allow_list_mime_types) do {:ok, %__MODULE__{ id: UUID.generate(), name: name, tempfile: file.path, content_type: content_type, size: size }} end end defp prepare_upload(%{body: body, name: name} = _file, opts) do with :ok <- check_binary_size(body, opts.size_limit), tmp_path <- tempfile_for_image(body), {:ok, content_type, name} <- MIME.file_mime_type(tmp_path, name), :ok <- check_allowed_mime_type(content_type, opts.allow_list_mime_types) do {:ok, %__MODULE__{ id: UUID.generate(), name: name, tempfile: tmp_path, content_type: content_type, size: byte_size(body) }} end end defp check_file_size(path, size_limit) when is_integer(size_limit) and size_limit > 0 do with {:ok, %{size: size}} <- File.stat(path), true <- size <= size_limit do {:ok, size} else false -> {:error, :file_too_large} error -> error end end defp check_file_size(_, _), do: :ok defp check_binary_size(binary, size_limit) when is_integer(size_limit) and size_limit > 0 and byte_size(binary) >= size_limit do {:error, :file_too_large} end defp check_binary_size(_, _), do: :ok # Creates a tempfile using the Plug.Upload Genserver which cleans them up # automatically. defp tempfile_for_image(data) do {:ok, tmp_path} = Plug.Upload.random_file("temp_files") {:ok, tmp_file} = File.open(tmp_path, [:write, :raw, :binary]) IO.binwrite(tmp_file, data) tmp_path end defp url_from_spec(%__MODULE__{name: name}, base_url, {:file, path}) do path = URI.encode(path, &char_unescaped?/1) <> if Config.get([__MODULE__, :link_name], false) do "?name=#{URI.encode(name, &char_unescaped?/1)}" else "" end [base_url, "media", path] |> Path.join() end defp url_from_spec(_upload, _base_url, {:url, url}), do: url @spec check_allowed_mime_type(String.t(), List.t()) :: :ok | {:error, :atom} defp check_allowed_mime_type(content_type, allow_list_mime_types) do if Enum.any?(allow_list_mime_types, &(&1 == content_type)), do: :ok, else: {:error, :mime_type_not_allowed} end end