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281 lines
8.7 KiB
Elixir
281 lines
8.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Upload do
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@moduledoc """
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Manage user uploads
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Options:
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* `:type`: presets for activity type (defaults to Document) and size limits from app configuration
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* `:description`: upload alternative text
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* `:base_url`: override base url
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* `:uploader`: override uploader
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* `:filters`: override filters
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* `:size_limit`: override size limit
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* `:activity_type`: override activity type
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The `%Pleroma.Upload{}` struct: all documented fields are meant to be overwritten in filters:
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* `:id` - the upload id.
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* `:name` - the upload file name.
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* `:path` - the upload path: set at first to `id/name` but can be changed. Keep in mind that the path
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is once created permanent and changing it (especially in uploaders) is probably a bad idea!
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* `:tempfile` - path to the temporary file. Prefer in-place changes on the file rather than changing the
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path as the temporary file is also tracked by `Plug.Upload{}` and automatically deleted once the request is over.
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* `:width` - width of the media in pixels
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* `:height` - height of the media in pixels
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* `:blurhash` - string hash of the image encoded with the blurhash algorithm (https://blurha.sh/)
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Related behaviors:
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* `Pleroma.Uploaders.Uploader`
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* `Pleroma.Upload.Filter`
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"""
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alias Ecto.UUID
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alias Pleroma.Config
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alias Pleroma.Maps
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alias Pleroma.Web.ActivityPub.Utils
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require Logger
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@type source ::
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Plug.Upload.t()
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| (data_uri_string :: String.t())
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| {:from_local, name :: String.t(), id :: String.t(), path :: String.t()}
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| map()
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@type option ::
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{:type, :avatar | :banner | :background}
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| {:description, String.t()}
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| {:activity_type, String.t()}
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| {:size_limit, nil | non_neg_integer()}
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| {:uploader, module()}
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| {:filters, [module()]}
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@type t :: %__MODULE__{
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id: String.t(),
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name: String.t(),
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tempfile: String.t(),
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content_type: String.t(),
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width: integer(),
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height: integer(),
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blurhash: String.t(),
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description: String.t(),
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path: String.t()
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}
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@always_enabled_filters [Pleroma.Upload.Filter.Dedupe]
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defstruct [
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:id,
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:name,
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:tempfile,
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:content_type,
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:width,
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:height,
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:blurhash,
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:description,
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:path
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]
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@spec store(source, options :: [option()]) :: {:ok, Map.t()} | {:error, any()}
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@doc "Store a file. If using a `Plug.Upload{}` as the source, be sure to use `Majic.Plug` to ensure its content_type and filename is correct."
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def store(upload, opts \\ []) do
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opts = get_opts(opts)
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with {:ok, upload} <- prepare_upload(upload, opts),
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upload = %__MODULE__{upload | path: upload.path || "#{upload.id}/#{upload.name}"},
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{:ok, upload} <- Pleroma.Upload.Filter.filter(opts.filters, upload),
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description = Map.get(upload, :description) || "",
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{_, true} <-
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{:description_limit,
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String.length(description) <= Pleroma.Config.get([:instance, :description_limit])},
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{:ok, url_spec} <- Pleroma.Uploaders.Uploader.put_file(opts.uploader, upload) do
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{:ok,
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%{
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"id" => Utils.generate_object_id(),
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"type" => opts.activity_type,
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"mediaType" => upload.content_type,
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"url" => [
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%{
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"type" => "Link",
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"mediaType" => upload.content_type,
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"href" => url_from_spec(upload, opts.base_url, url_spec)
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}
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|> Maps.put_if_present("width", upload.width)
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|> Maps.put_if_present("height", upload.height)
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],
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"name" => description
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}
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|> Maps.put_if_present("blurhash", upload.blurhash)}
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else
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{:description_limit, _} ->
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{:error, :description_too_long}
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{:error, error} ->
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Logger.error(
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"#{__MODULE__} store (using #{inspect(opts.uploader)}) failed: #{inspect(error)}"
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)
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{:error, error}
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end
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end
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def char_unescaped?(char) do
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URI.char_unreserved?(char) or char == ?/
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end
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defp get_opts(opts) do
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{size_limit, activity_type} =
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case Keyword.get(opts, :type) do
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:banner ->
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{Pleroma.Config.get!([:instance, :banner_upload_limit]), "Image"}
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:avatar ->
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{Pleroma.Config.get!([:instance, :avatar_upload_limit]), "Image"}
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:background ->
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{Pleroma.Config.get!([:instance, :background_upload_limit]), "Image"}
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_ ->
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{Pleroma.Config.get!([:instance, :upload_limit]), "Document"}
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end
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%{
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activity_type: Keyword.get(opts, :activity_type, activity_type),
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size_limit: Keyword.get(opts, :size_limit, size_limit),
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uploader: Keyword.get(opts, :uploader, Pleroma.Config.get([__MODULE__, :uploader])),
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filters:
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Enum.uniq(
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Keyword.get(opts, :filters, Pleroma.Config.get([__MODULE__, :filters])) ++
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@always_enabled_filters
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),
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description: Keyword.get(opts, :description),
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base_url: base_url()
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}
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end
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defp prepare_upload(%Plug.Upload{} = file, opts) do
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with :ok <- check_file_size(file.path, opts.size_limit) do
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{:ok,
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%__MODULE__{
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id: UUID.generate(),
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name: file.filename,
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tempfile: file.path,
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content_type: file.content_type,
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description: opts.description
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}}
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end
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end
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defp prepare_upload(%{img: "data:image/" <> image_data}, opts) do
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parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data)
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data = Base.decode64!(parsed["data"], ignore: :whitespace)
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hash = Base.encode16(:crypto.hash(:sha256, data), case: :lower)
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with :ok <- check_binary_size(data, opts.size_limit),
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tmp_path <- tempfile_for_image(data),
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{:ok, %{mime_type: content_type}} <-
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Majic.perform({:bytes, data}, pool: Pleroma.MajicPool),
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[ext | _] <- MIME.extensions(content_type) do
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{:ok,
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%__MODULE__{
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id: UUID.generate(),
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name: hash <> "." <> ext,
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tempfile: tmp_path,
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content_type: content_type,
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description: opts.description
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}}
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end
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end
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# For Mix.Tasks.MigrateLocalUploads
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defp prepare_upload(%__MODULE__{tempfile: path} = upload, _opts) do
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with {:ok, %{mime_type: content_type}} <- Majic.perform(path, pool: Pleroma.MajicPool) do
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{:ok, %__MODULE__{upload | content_type: content_type}}
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end
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end
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defp check_binary_size(binary, size_limit)
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when is_integer(size_limit) and size_limit > 0 and byte_size(binary) >= size_limit do
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{:error, :file_too_large}
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end
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defp check_binary_size(_, _), do: :ok
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defp check_file_size(path, size_limit) when is_integer(size_limit) and size_limit > 0 do
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with {:ok, %{size: size}} <- File.stat(path),
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true <- size <= size_limit do
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:ok
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else
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false -> {:error, :file_too_large}
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error -> error
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end
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end
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defp check_file_size(_, _), do: :ok
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# Creates a tempfile using the Plug.Upload Genserver which cleans them up
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# automatically.
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defp tempfile_for_image(data) do
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{:ok, tmp_path} = Plug.Upload.random_file("profile_pics")
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{:ok, tmp_file} = File.open(tmp_path, [:write, :raw, :binary])
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IO.binwrite(tmp_file, data)
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tmp_path
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end
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defp url_from_spec(%__MODULE__{name: name}, base_url, {:file, path}) do
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path =
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URI.encode(path, &char_unescaped?/1) <>
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if Pleroma.Config.get([__MODULE__, :link_name], false) do
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"?name=#{URI.encode(name, &char_unescaped?/1)}"
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else
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""
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end
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[base_url, path]
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|> Path.join()
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end
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defp url_from_spec(_upload, _base_url, {:url, url}), do: url
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def base_url do
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uploader = Config.get([Pleroma.Upload, :uploader])
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upload_base_url = Config.get([Pleroma.Upload, :base_url])
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public_endpoint = Config.get([uploader, :public_endpoint])
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case uploader do
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Pleroma.Uploaders.Local ->
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upload_base_url
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Pleroma.Uploaders.S3 ->
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bucket = Config.get([Pleroma.Uploaders.S3, :bucket])
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truncated_namespace = Config.get([Pleroma.Uploaders.S3, :truncated_namespace])
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namespace = Config.get([Pleroma.Uploaders.S3, :bucket_namespace])
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bucket_with_namespace =
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cond do
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!is_nil(truncated_namespace) ->
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truncated_namespace
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!is_nil(namespace) ->
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namespace <> ":" <> bucket
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true ->
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bucket
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end
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if public_endpoint do
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Path.join([public_endpoint, bucket_with_namespace])
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else
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Path.join([upload_base_url, bucket_with_namespace])
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end
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_ ->
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public_endpoint || upload_base_url
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end
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end
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end
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