Add IdProvider interface.

idp/provider.go

@@ -0,0 +1,35 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package idp
+
+import (
+	"net/http"
+
+	"golang.org/x/oauth2"
+)
+
+type IdProvider interface {
+	GetConfig() *oauth2.Config
+	GetEmail(httpClient *http.Client, token *oauth2.Token) string
+	GetLoginAndAvatar(httpClient *http.Client, token *oauth2.Token) (string, string)
+}
+
+func GetIdProvider(providerType string) IdProvider {
+	if providerType == "github" {
+		return &GithubIdProvider{}
+	}
+
+	return nil
+}