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/config/identity/openid/validators.go

@@ -0,0 +1,92 @@
+// 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 openid
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+)
+
+// ID - holds identification name authentication validator target.
+type ID string
+
+// Validator interface describes basic implementation
+// requirements of various authentication providers.
+type Validator interface {
+	// Validate is a custom validator function for this provider,
+	// each validation is authenticationType or provider specific.
+	Validate(token string, duration string) (map[string]interface{}, error)
+
+	// ID returns provider name of this provider.
+	ID() ID
+}
+
+// ErrTokenExpired - error token expired
+var (
+	ErrTokenExpired = errors.New("token expired")
+)
+
+// Validators - holds list of providers indexed by provider id.
+type Validators struct {
+	sync.RWMutex
+	providers map[ID]Validator
+}
+
+// Add - adds unique provider to provider list.
+func (list *Validators) Add(provider Validator) error {
+	list.Lock()
+	defer list.Unlock()
+
+	if _, ok := list.providers[provider.ID()]; ok {
+		return fmt.Errorf("provider %v already exists", provider.ID())
+	}
+
+	list.providers[provider.ID()] = provider
+	return nil
+}
+
+// List - returns available provider IDs.
+func (list *Validators) List() []ID {
+	list.RLock()
+	defer list.RUnlock()
+
+	keys := []ID{}
+	for k := range list.providers {
+		keys = append(keys, k)
+	}
+
+	return keys
+}
+
+// Get - returns the provider for the given providerID, if not found
+// returns an error.
+func (list *Validators) Get(id ID) (p Validator, err error) {
+	list.RLock()
+	defer list.RUnlock()
+	var ok bool
+	if p, ok = list.providers[id]; !ok {
+		return nil, fmt.Errorf("provider %v doesn't exist", id)
+	}
+	return p, nil
+}
+
+// NewValidators - creates Validators.
+func NewValidators() *Validators {
+	return &Validators{providers: make(map[ID]Validator)}
+}