# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.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 `%Pleroma.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: * `Pleroma.Uploaders.Uploader` * `Pleroma.Upload.Filter` """ alias Ecto.UUID 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() } defstruct [:id, :name, :tempfile, :content_type, :path] @spec store(source, options :: [option()]) :: {:ok, Map.t()} | {: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} <- Pleroma.Upload.Filter.filter(opts.filters, upload), {:ok, url_spec} <- Pleroma.Uploaders.Uploader.put_file(opts.uploader, upload) do {:ok, %{ "type" => opts.activity_type, "url" => [ %{ "type" => "Link", "mediaType" => upload.content_type, "href" => url_from_spec(upload, opts.base_url, url_spec) } ], "name" => Map.get(opts, :description) || upload.name }} else {:error, error} -> Logger.error( "#{__MODULE__} store (using #{inspect(opts.uploader)}) failed: #{inspect(error)}" ) {:error, error} 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 -> {Pleroma.Config.get!([:instance, :banner_upload_limit]), "Image"} :avatar -> {Pleroma.Config.get!([:instance, :avatar_upload_limit]), "Image"} :background -> {Pleroma.Config.get!([:instance, :background_upload_limit]), "Image"} _ -> {Pleroma.Config.get!([:instance, :upload_limit]), "Document"} end opts = %{ activity_type: Keyword.get(opts, :activity_type, activity_type), size_limit: Keyword.get(opts, :size_limit, size_limit), uploader: Keyword.get(opts, :uploader, Pleroma.Config.get([__MODULE__, :uploader])), filters: Keyword.get(opts, :filters, Pleroma.Config.get([__MODULE__, :filters])), description: Keyword.get(opts, :description), base_url: Keyword.get( opts, :base_url, Pleroma.Config.get([__MODULE__, :base_url], Pleroma.Web.base_url()) ) } # TODO: 1.0+ : remove old config compatibility opts = if Pleroma.Config.get([__MODULE__, :strip_exif]) == true && !Enum.member?(opts.filters, Pleroma.Upload.Filter.Mogrify) do Logger.warn(""" Pleroma: configuration `:instance, :strip_exif` is deprecated, please instead set: :pleroma, Pleroma.Upload, [filters: [Pleroma.Upload.Filter.Mogrify]] :pleroma, Pleroma.Upload.Filter.Mogrify, args: ["strip", "auto-orient"] """) Pleroma.Config.put([Pleroma.Upload.Filter.Mogrify], args: ["strip", "auto-orient"]) Map.put(opts, :filters, opts.filters ++ [Pleroma.Upload.Filter.Mogrify]) else opts end if Pleroma.Config.get([:instance, :dedupe_media]) == true && !Enum.member?(opts.filters, Pleroma.Upload.Filter.Dedupe) do Logger.warn(""" Pleroma: configuration `:instance, :dedupe_media` is deprecated, please instead set: :pleroma, Pleroma.Upload, [filters: [Pleroma.Upload.Filter.Dedupe]] """) Map.put(opts, :filters, opts.filters ++ [Pleroma.Upload.Filter.Dedupe]) else opts end end defp prepare_upload(%Plug.Upload{} = file, opts) do with :ok <- check_file_size(file.path, opts.size_limit), {:ok, content_type, name} <- Pleroma.MIME.file_mime_type(file.path, file.filename) do {:ok, %__MODULE__{ id: UUID.generate(), name: name, tempfile: file.path, content_type: content_type }} end end defp prepare_upload(%{"img" => "data:image/" <> image_data}, opts) do parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data) data = Base.decode64!(parsed["data"], ignore: :whitespace) hash = String.downcase(Base.encode16(:crypto.hash(:sha256, data))) with :ok <- check_binary_size(data, opts.size_limit), tmp_path <- tempfile_for_image(data), {:ok, content_type, name} <- Pleroma.MIME.bin_mime_type(data, hash <> "." <> parsed["filetype"]) do {:ok, %__MODULE__{ id: UUID.generate(), name: name, tempfile: tmp_path, content_type: content_type }} end end # For Mix.Tasks.MigrateLocalUploads defp prepare_upload(%__MODULE__{tempfile: path} = upload, _opts) do with {:ok, content_type} <- Pleroma.MIME.file_mime_type(path) do {:ok, %__MODULE__{upload | content_type: content_type}} end end 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 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 else false -> {:error, :file_too_large} error -> error end end defp check_file_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("profile_pics") {: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 Pleroma.Config.get([__MODULE__, :link_name], false) do "?name=#{URI.encode(name, &char_unescaped?/1)}" else "" end prefix = if is_nil(Pleroma.Config.get([__MODULE__, :base_url])) do "media" else "" end [base_url, prefix, path] |> Path.join() end defp url_from_spec(_upload, _base_url, {:url, url}), do: url end