internal: walk config in go, check, parse and load from scheme like in python

closes #2719

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/config/config_test.go

@@ -0,0 +1,39 @@
+package config
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfigEnv(t *testing.T) {
+	os.Setenv("AUTHENTIK_SECRET_KEY", "bar")
+	cfg = nil
+	Get().fromEnv()
+	assert.Equal(t, "bar", Get().SecretKey)
+}
+
+func TestConfigEnv_Scheme(t *testing.T) {
+	os.Setenv("foo", "bar")
+	os.Setenv("AUTHENTIK_SECRET_KEY", "env://foo")
+	cfg = nil
+	Get().fromEnv()
+	assert.Equal(t, "bar", Get().SecretKey)
+}
+
+func TestConfigEnv_File(t *testing.T) {
+	file, err := os.CreateTemp("", "")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer os.Remove(file.Name())
+	file.Write([]byte("bar"))
+
+	os.Setenv("AUTHENTIK_SECRET_KEY", fmt.Sprintf("file://%s", file.Name()))
+	cfg = nil
+	Get().fromEnv()
+	assert.Equal(t, "bar", Get().SecretKey)
+}