Add OAuth2 authentication

server/oauth2/manager.go

@@ -0,0 +1,33 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package oauth2
+
+import "errors"
+
+// Manager handles OAuth2 providers.
+type Manager struct {
+	providers map[string]Provider
+}
+
+// Provider returns the given provider.
+func (m *Manager) Provider(name string) (Provider, error) {
+	if provider, found := m.providers[name]; found {
+		return provider, nil
+	}
+
+	return nil, errors.New("oauth2 provider not found")
+}
+
+// AddProvider add a new OAuth2 provider.
+func (m *Manager) AddProvider(name string, provider Provider) {
+	m.providers[name] = provider
+}
+
+// NewManager returns a new Manager.
+func NewManager(clientID, clientSecret, redirectURL string) *Manager {
+	m := &Manager{providers: make(map[string]Provider)}
+	m.AddProvider("google", newGoogleProvider(clientID, clientSecret, redirectURL))
+	return m
+}