refactor: remove dependency on traefik

internal/utils/loaders/loader_env.go

@@ -0,0 +1,25 @@
+package loaders
+
+import (
+	"fmt"
+	"os"
+	"tinyauth/internal/config"
+
+	"github.com/traefik/paerser/cli"
+	"github.com/traefik/paerser/env"
+)
+
+type EnvLoader struct{}
+
+func (e *EnvLoader) Load(_ []string, cmd *cli.Command) (bool, error) {
+	vars := env.FindPrefixedEnvVars(os.Environ(), config.DefaultNamePrefix, cmd.Configuration)
+	if len(vars) == 0 {
+		return false, nil
+	}
+
+	if err := env.Decode(vars, config.DefaultNamePrefix, cmd.Configuration); err != nil {
+		return false, fmt.Errorf("failed to decode configuration from environment variables: %w", err)
+	}
+
+	return true, nil
+}

internal/utils/loaders/loader_flag.go

@@ -0,0 +1,22 @@
+package loaders
+
+import (
+	"fmt"
+
+	"github.com/traefik/paerser/cli"
+	"github.com/traefik/paerser/flag"
+)
+
+type FlagLoader struct{}
+
+func (*FlagLoader) Load(args []string, cmd *cli.Command) (bool, error) {
+	if len(args) == 0 {
+		return false, nil
+	}
+
+	if err := flag.Decode(args, cmd.Configuration); err != nil {
+		return false, fmt.Errorf("failed to decode configuration from flags: %w", err)
+	}
+
+	return true, nil
+}