forked from AkkomaGang/akkoma
6c396fcab4
When no image description is filled in, Pleroma allowed fallbacks. Those were (based on a setting) either the filename, or a fixed description. Neither are good options for image descriptions imo, so here we remove this. Note that there's two tests removed who supposedly tested something else. But examining closer, they didn't seem to test what they claimed to test, so I removed them rather than try to "fix" them.
260 lines
8.5 KiB
Elixir
260 lines
8.5 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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path: String.t()
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}
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defstruct [:id, :name, :tempfile, :content_type, :width, :height, :blurhash, :path]
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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(opts, :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: Keyword.get(opts, :filters, Pleroma.Config.get([__MODULE__, :filters])),
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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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}}
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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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}}
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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 || Pleroma.Web.Endpoint.url() <> "/media/"
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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 || Pleroma.Web.Endpoint.url() <> "/media/"
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end
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end
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end
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