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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Upload.Filter.Dedupe do
   6   @behaviour Pleroma.Upload.Filter
   7   alias Pleroma.Upload
   8
   9   def filter(%Upload{name: name, tempfile: tempfile} = upload) do
  10     extension =
  11       name
  12       |> String.split(".")
  13       |> List.last()
  14
  15     shasum =
  16       :crypto.hash(:sha256, File.read!(tempfile))
  17       |> Base.encode16(case: :lower)
  18
  19     filename = shasum <> "." <> extension
  20     {:ok, %Upload{upload | id: shasum, path: filename}}
  21   end
  22
  23   def filter(_), do: :ok
  24 end