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61 lines
1.6 KiB
Elixir
61 lines
1.6 KiB
Elixir
defmodule PhilomenaWeb.ScraperPlug do
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@filename_regex ~r/filename="([^"]+)"/
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@spec init(keyword()) :: keyword()
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def init(opts) do
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opts
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end
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@spec call(Plug.Conn.t(), keyword()) :: Plug.Conn.t()
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def call(conn, opts) do
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params_name = Keyword.get(opts, :params_name, "image")
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params_key = Keyword.get(opts, :params_key, "image")
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case conn.params do
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%{^params_name => %{^params_key => %Plug.Upload{}}} ->
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conn
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%{"scraper_cache" => url} when not is_nil(url) and url != "" ->
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url
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|> PhilomenaProxy.Http.get()
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|> maybe_fixup_params(url, opts, conn)
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_ ->
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conn
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end
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end
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# Writing the tempfile doesn't allow traversal
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# sobelow_skip ["Traversal.FileModule"]
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defp maybe_fixup_params({:ok, %{status: 200} = resp}, url, opts, conn) do
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params_name = Keyword.get(opts, :params_name, "image")
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params_key = Keyword.get(opts, :params_key, "image")
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name = extract_filename(url, resp.headers)
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file = Plug.Upload.random_file!(UUID.uuid1())
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File.write!(file, resp.body)
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fake_upload = %Plug.Upload{
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path: file,
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content_type: "application/octet-stream",
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filename: name
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}
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put_in(conn.params[params_name][params_key], fake_upload)
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end
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defp maybe_fixup_params(_response, _url, _opts, conn), do: conn
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defp extract_filename(url, headers) do
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name =
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with [value | _] <- headers["content-disposition"],
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[name] <- Regex.run(@filename_regex, value, capture: :all_but_first) do
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name
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else
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_ ->
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Path.basename(url)
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end
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String.slice(name, 0, 127)
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end
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end
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