move config parsing in separate package for each service

web/pkg/config/defaultconfig.go

@@ -1,5 +1,7 @@
 package config
 
+import "github.com/owncloud/ocis/ocis-pkg/version"
+
 func DefaultConfig() *Config {
 	return &Config{
 		Debug: Debug{
@@ -15,7 +17,8 @@ func DefaultConfig() *Config {
 			CacheTTL:  604800, // 7 days
 		},
 		Service: Service{
-			Name: "web",
+			Name:    "web",
+			Version: version.String, // TODO: ensure everywhere or remove
 		},
 		Tracing: Tracing{
 			Enabled:   false,

web/pkg/config/parser/parse.go

@@ -0,0 +1,42 @@
+package parser
+
+import (
+	"errors"
+
+	ociscfg "github.com/owncloud/ocis/ocis-pkg/config"
+	"github.com/owncloud/ocis/web/pkg/config"
+
+	"github.com/owncloud/ocis/ocis-pkg/config/envdecode"
+)
+
+// ParseConfig loads accounts configuration from known paths.
+func ParseConfig(cfg *config.Config) error {
+	_, err := ociscfg.BindSourcesToStructs(cfg.Service.Name, cfg)
+	if err != nil {
+		return err
+	}
+
+	// provide with defaults for shared logging, since we need a valid destination address for BindEnv.
+	if cfg.Log == nil && cfg.Commons != nil && cfg.Commons.Log != nil {
+		cfg.Log = &config.Log{
+			Level:  cfg.Commons.Log.Level,
+			Pretty: cfg.Commons.Log.Pretty,
+			Color:  cfg.Commons.Log.Color,
+			File:   cfg.Commons.Log.File,
+		}
+	} else if cfg.Log == nil && cfg.Commons == nil {
+		cfg.Log = &config.Log{}
+	}
+
+	// load all env variables relevant to the config in the current context.
+	if err := envdecode.Decode(cfg); err != nil {
+		// no environment variable set for this config is an expected "error"
+		if !errors.Is(err, envdecode.ErrNoTargetFieldsAreSet) {
+			return err
+		}
+	}
+
+	// sanitize config
+
+	return nil
+}