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diff --git a/lib/majic/plug.ex b/lib/majic/plug.ex
index 99d78cc..0dbc79e 100644
--- a/lib/majic/plug.ex
+++ b/lib/majic/plug.ex
@@ -1,142 +1,141 @@
if Code.ensure_loaded?(Plug) do
defmodule Majic.PlugError do
defexception [:message]
end
defmodule Majic.Plug do
@moduledoc """
A `Plug` to automatically set the `content_type` of every `Plug.Upload`.
One of the required option of `pool`, `server` or `once` must be set.
Additional options:
* `fix_extension`, default true: enable use of `Majic.Extension`,
* options for `Majic.Extension`.
To use a majic pool:
```
plug Majic.Plug, pool: MyApp.MajicPool
```
To use a single majic server:
```
plug Majic.Plug, server: MyApp.MajicServer
```
To start a majic process at each file (not recommended):
```
plug Majic.Plug, once: true
```
"""
@behaviour Plug
@impl Plug
def init(opts) do
cond do
Keyword.has_key?(opts, :pool) -> true
Keyword.has_key?(opts, :server) -> true
Keyword.has_key?(opts, :once) -> true
true -> raise(Majic.PlugError, "No server/pool/once option defined")
end
opts
|> Keyword.put_new(:fix_extension, true)
|> Keyword.put_new(:append, false)
|> Keyword.put_new(:subtype_as_extension, false)
end
@impl Plug
def call(conn, opts) do
collected = collect_uploads([], conn.body_params, [])
Enum.reduce(collected, conn, fn {param_path, upload}, conn ->
{array_index, param_path} =
case param_path do
[index, :array | path] ->
{index, path}
path ->
{nil, path}
end
param_path = Enum.reverse(param_path)
upload =
case Majic.perform(upload.path, opts) do
{:ok, magic} -> fix_upload(upload, magic, opts)
{:error, error} -> raise(Majic.PlugError, "Failed to majic: #{inspect(error)}")
end
conn
|> put_in_if_exists(:params, param_path, upload, array_index)
|> put_in_if_exists(:body_params, param_path, upload, array_index)
end)
end
defp collect_uploads(path, params, acc) do
Enum.reduce(params, acc, fn value, acc -> collect_upload(path, value, acc) end)
end
# An upload!
defp collect_upload(path, {k, %{__struct__: Plug.Upload} = upload}, acc) do
[{[k | path], upload} | acc]
end
# Ignore structs.
defp collect_upload(_path, {_, %{__struct__: _}}, acc) do
acc
end
# Nested map.
defp collect_upload(path, {k, v}, acc) when is_map(v) do
collect_uploads([k | path], v, acc)
end
defp collect_upload(path, {k, v}, acc) when is_list(v) do
Enum.reduce(Enum.with_index(v), acc, fn {item, index}, acc ->
collect_upload([:array, k | path], {index, item}, acc)
end)
end
defp collect_upload(_path, _, acc) do
acc
end
defp fix_upload(upload, magic, opts) do
filename =
if Keyword.get(opts, :fix_extension) do
- IO.puts("FIXING EXTENSION #{inspect opts}")
ext_opts = [
append: Keyword.get(opts, :append, false),
subtype_as_extension: Keyword.get(opts, :subtype_as_extension, false)
]
Majic.Extension.fix(upload.filename, magic, ext_opts)
end
%{upload | content_type: magic.mime_type, filename: filename || upload.filename}
end
# put value at path in conn.
defp put_in_if_exists(conn, key, path, value, nil) do
if get_in(Map.get(conn, key), path) do
Map.put(conn, key, put_in(Map.get(conn, key), path, value))
else
conn
end
end
# change value at index in list at path in conn.
defp put_in_if_exists(conn, key, path, value, index) do
if array = get_in(Map.get(conn, key), path) do
array = List.replace_at(array, index, value)
Map.put(conn, key, put_in(Map.get(conn, key), path, array))
else
conn
end
end
end
end

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