summaryrefslogtreecommitdiff
path: root/lib/pleroma/upload.ex
blob: 17822dc5eb65959e5ad753f9550d0a119de058d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 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.
  * `:width` - width of the media in pixels
  * `:height` - height of the media in pixels
  * `:blurhash` - string hash of the image encoded with the blurhash algorithm (https://blurha.sh/)

  Related behaviors:

  * `Pleroma.Uploaders.Uploader`
  * `Pleroma.Upload.Filter`

  """
  alias Ecto.UUID
  alias Pleroma.Config
  alias Pleroma.Maps
  require Logger

  @type source ::
          Plug.Upload.t()
          | (data_uri_string :: String.t())
          | {:from_local, name :: String.t(), id :: String.t(), path :: String.t()}
          | map()

  @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(),
          width: integer(),
          height: integer(),
          blurhash: String.t(),
          path: String.t()
        }
  defstruct [:id, :name, :tempfile, :content_type, :width, :height, :blurhash, :path]

  defp get_description(opts, upload) do
    case {opts[:description], Pleroma.Config.get([Pleroma.Upload, :default_description])} do
      {description, _} when is_binary(description) -> description
      {_, :filename} -> upload.name
      {_, str} when is_binary(str) -> str
      _ -> ""
    end
  end

  @spec store(source, options :: [option()]) :: {:ok, Map.t()} | {:error, any()}
  @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."
  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),
         description = get_description(opts, upload),
         {_, true} <-
           {:description_limit,
            String.length(description) <= Pleroma.Config.get([:instance, :description_limit])},
         {:ok, url_spec} <- Pleroma.Uploaders.Uploader.put_file(opts.uploader, upload) do
      {:ok,
       %{
         "type" => opts.activity_type,
         "mediaType" => upload.content_type,
         "url" => [
           %{
             "type" => "Link",
             "mediaType" => upload.content_type,
             "href" => url_from_spec(upload, opts.base_url, url_spec)
           }
           |> Maps.put_if_present("width", upload.width)
           |> Maps.put_if_present("height", upload.height)
         ],
         "name" => description
       }
       |> Maps.put_if_present("blurhash", upload.blurhash)}
    else
      {:description_limit, _} ->
        {:error, :description_too_long}

      {: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

    %{
      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: base_url()
    }
  end

  defp prepare_upload(%Plug.Upload{} = file, opts) do
    with :ok <- check_file_size(file.path, opts.size_limit) do
      {:ok,
       %__MODULE__{
         id: UUID.generate(),
         name: file.filename,
         tempfile: file.path,
         content_type: file.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 = Base.encode16(:crypto.hash(:sha256, data), lower: true)

    with :ok <- check_binary_size(data, opts.size_limit),
         tmp_path <- tempfile_for_image(data),
         {:ok, %{mime_type: content_type}} <-
           Majic.perform({:bytes, data}, pool: Pleroma.MajicPool),
         [ext | _] <- MIME.extensions(content_type) do
      {:ok,
       %__MODULE__{
         id: UUID.generate(),
         name: hash <> "." <> ext,
         tempfile: tmp_path,
         content_type: content_type
       }}
    end
  end

  # For Mix.Tasks.MigrateLocalUploads
  defp prepare_upload(%__MODULE__{tempfile: path} = upload, _opts) do
    with {:ok, %{mime_type: content_type}} <- Majic.perform(path, pool: Pleroma.MajicPool) 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

    [base_url, path]
    |> Path.join()
  end

  defp url_from_spec(_upload, _base_url, {:url, url}), do: url

  def base_url do
    uploader = Config.get([Pleroma.Upload, :uploader])
    upload_base_url = Config.get([Pleroma.Upload, :base_url])
    public_endpoint = Config.get([uploader, :public_endpoint])

    case uploader do
      Pleroma.Uploaders.Local ->
        upload_base_url || Pleroma.Web.Endpoint.url() <> "/media/"

      Pleroma.Uploaders.S3 ->
        bucket = Config.get([Pleroma.Uploaders.S3, :bucket])
        truncated_namespace = Config.get([Pleroma.Uploaders.S3, :truncated_namespace])
        namespace = Config.get([Pleroma.Uploaders.S3, :bucket_namespace])

        bucket_with_namespace =
          cond do
            !is_nil(truncated_namespace) ->
              truncated_namespace

            !is_nil(namespace) ->
              namespace <> ":" <> bucket

            true ->
              bucket
          end

        if public_endpoint do
          Path.join([public_endpoint, bucket_with_namespace])
        else
          Path.join([upload_base_url, bucket_with_namespace])
        end

      _ ->
        public_endpoint || upload_base_url || Pleroma.Web.Endpoint.url() <> "/media/"
    end
  end
end