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Compose web applications with functions
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lib/plug/parsers/multipart.ex
defmodule Plug.Parsers.MULTIPART do
@moduledoc """
Parses multipart request body.
"""
@behaviour Plug.Parsers
def parse(conn, "multipart", subtype, _headers, opts) when subtype in ["form-data", "mixed"] do
{adapter, state} = conn.adapter
case adapter.parse_req_multipart(state, opts, &handle_headers/1) do
{:ok, params, state} ->
{:ok, params, %{conn | adapter: {adapter, state}}}
{:more, _params, state} ->
{:error, :too_large, %{conn | adapter: {adapter, state}}}
end
end
def parse(conn, _type, _subtype, _headers, _opts) do
{:next, conn}
end
defp handle_headers(headers) do
case List.keyfind(headers, "content-disposition", 0) do
{_, disposition} -> handle_disposition(disposition, headers)
nil -> :skip
end
end
defp handle_disposition(disposition, headers) do
case :binary.split(disposition, ";") do
[_, params] ->
params = Plug.Conn.Utils.params(params)
if name = Map.get(params, "name") do
handle_disposition_params(name, params, headers)
else
:skip
end
[_] ->
:skip
end
end
defp handle_disposition_params(name, params, headers) do
if filename = Map.get(params, "filename") do
path = Plug.Upload.random_file!("multipart")
file = File.open!(path, [:write, :binary])
{:file, name, file, %Plug.Upload{filename: filename, path: path,
content_type: get_header(headers, "content-type")}}
else
{:binary, name}
end
end
defp get_header(headers, key) do
case List.keyfind(headers, key, 0) do
{^key, value} -> value
nil -> nil
end
end
end