mirror of
https://github.com/philomena-dev/philomena.git
synced 2024-11-25 04:47:59 +01:00
61 lines
1.6 KiB
Elixir
61 lines
1.6 KiB
Elixir
defmodule PhilomenaWeb.ScraperPlug do
|
|
@filename_regex ~r/filename="([^"]+)"/
|
|
|
|
@spec init(keyword()) :: keyword()
|
|
def init(opts) do
|
|
opts
|
|
end
|
|
|
|
@spec call(Plug.Conn.t(), keyword()) :: Plug.Conn.t()
|
|
def call(conn, opts) do
|
|
params_name = Keyword.get(opts, :params_name, "image")
|
|
params_key = Keyword.get(opts, :params_key, "image")
|
|
|
|
case conn.params do
|
|
%{^params_name => %{^params_key => %Plug.Upload{}}} ->
|
|
conn
|
|
|
|
%{"scraper_cache" => url} when not is_nil(url) and url != "" ->
|
|
url
|
|
|> PhilomenaProxy.Http.get()
|
|
|> maybe_fixup_params(url, opts, conn)
|
|
|
|
_ ->
|
|
conn
|
|
end
|
|
end
|
|
|
|
# Writing the tempfile doesn't allow traversal
|
|
# sobelow_skip ["Traversal.FileModule"]
|
|
defp maybe_fixup_params({:ok, %{status: 200} = resp}, url, opts, conn) do
|
|
params_name = Keyword.get(opts, :params_name, "image")
|
|
params_key = Keyword.get(opts, :params_key, "image")
|
|
name = extract_filename(url, resp.headers)
|
|
file = Plug.Upload.random_file!(UUID.uuid1())
|
|
|
|
File.write!(file, resp.body)
|
|
|
|
fake_upload = %Plug.Upload{
|
|
path: file,
|
|
content_type: "application/octet-stream",
|
|
filename: name
|
|
}
|
|
|
|
put_in(conn.params[params_name][params_key], fake_upload)
|
|
end
|
|
|
|
defp maybe_fixup_params(_response, _url, _opts, conn), do: conn
|
|
|
|
defp extract_filename(url, headers) do
|
|
name =
|
|
with [value | _] <- headers["content-disposition"],
|
|
[name] <- Regex.run(@filename_regex, value, capture: :all_but_first) do
|
|
name
|
|
else
|
|
_ ->
|
|
Path.basename(url)
|
|
end
|
|
|
|
String.slice(name, 0, 127)
|
|
end
|
|
end
|