feat: unified config (#533)

* chore: add yaml config ref

* feat: add initial implementation of a traefik like cli

* refactor: remove dependency on traefik

* chore: update example env

* refactor: update build

* chore: remove unused code

* fix: fix translations not loading

* feat: add experimental config file support

* chore: mod tidy

* fix: review comments

* refactor: move tinyauth to separate package

* chore: add quotes to all env variables

* chore: resolve go mod and sum conflicts

* chore: go mod tidy

* fix: review comments

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_file.go

@@ -0,0 +1,35 @@
+package loaders
+
+import (
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/paerser/cli"
+	"github.com/traefik/paerser/file"
+	"github.com/traefik/paerser/flag"
+)
+
+type FileLoader struct{}
+
+func (f *FileLoader) Load(args []string, cmd *cli.Command) (bool, error) {
+	flags, err := flag.Parse(args, cmd.Configuration)
+
+	if err != nil {
+		return false, err
+	}
+
+	// I guess we are using traefik as the root name
+	configFileFlag := "traefik.experimental.configFile"
+
+	if _, ok := flags[configFileFlag]; !ok {
+		return false, nil
+	}
+
+	log.Warn().Msg("Using experimental file config loader, this feature is experimental and may change or be removed in future releases")
+
+	err = file.Decode(flags[configFileFlag], cmd.Configuration)
+
+	if err != nil {
+		return false, 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
+}