rename all remaining packages to internal/ (#12418)

This is to ensure that there are no projects
that try to import `minio/minio/pkg` into
their own repo. Any such common packages should
go to `https://github.com/minio/pkg`

internal/net/port.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package net
+
+import (
+	"errors"
+	"strconv"
+)
+
+// Port - network port
+type Port uint16
+
+// String - returns string representation of port.
+func (p Port) String() string {
+	return strconv.Itoa(int(p))
+}
+
+// ParsePort - parses string into Port
+func ParsePort(s string) (p Port, err error) {
+	if s == "https" {
+		return Port(443), nil
+	} else if s == "http" {
+		return Port(80), nil
+	}
+
+	var i int
+	if i, err = strconv.Atoi(s); err != nil {
+		return p, errors.New("invalid port number")
+	}
+
+	if i < 0 || i > 65535 {
+		return p, errors.New("port must be between 0 to 65535")
+	}
+
+	return Port(i), nil
+}