[#91] Add support namespaces

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

cmd/http-gw/settings.go

@@ -49,6 +49,8 @@ const (
 
 	defaultBufferMaxSizeForPut = 1024 * 1024 // 1mb
 
+	defaultNamespaceHeader = "X-Frostfs-Namespace"
+
 	cfgServer      = "server"
 	cfgTLSEnabled  = "tls.enabled"
 	cfgTLSCertFile = "tls.cert_file"
@@ -116,6 +118,10 @@ const (
 	cfgBucketsCacheLifetime = "cache.buckets.lifetime"
 	cfgBucketsCacheSize     = "cache.buckets.size"
 
+	// Bucket resolving options.
+	cfgResolveNamespaceHeader   = "resolve_bucket.namespace_header"
+	cfgResolveDefaultNamespaces = "resolve_bucket.default_namespaces"
+
 	// Command line args.
 	cmdHelp          = "help"
 	cmdVersion       = "version"
@@ -199,6 +205,10 @@ func settings() *viper.Viper {
 	v.SetDefault(cfgPprofAddress, "localhost:8083")
 	v.SetDefault(cfgPrometheusAddress, "localhost:8084")
 
+	// resolve bucket
+	v.SetDefault(cfgResolveNamespaceHeader, defaultNamespaceHeader)
+	v.SetDefault(cfgResolveDefaultNamespaces, []string{"", "root"})
+
 	// Binding flags
 	if err := v.BindPFlag(cfgPprofEnabled, flags.Lookup(cmdPprof)); err != nil {
 		panic(err)