Add IdProvider interface.

idp/github.go

@@ -0,0 +1,101 @@
+// 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 (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+
+	"golang.org/x/oauth2"
+)
+
+type GithubIdProvider struct{}
+
+func (idp *GithubIdProvider) GetConfig() *oauth2.Config {
+	var githubEndpoint = oauth2.Endpoint{
+		AuthURL:  "https://github.com/login/oauth/authorize",
+		TokenURL: "https://github.com/login/oauth/access_token",
+	}
+
+	var githubOauthConfig = &oauth2.Config{
+		Scopes:   []string{"user:email", "read:user"},
+		Endpoint: githubEndpoint,
+	}
+
+	return githubOauthConfig
+}
+
+func (idp *GithubIdProvider) GetEmail(httpClient *http.Client, token *oauth2.Token) string {
+	res := ""
+
+	type GithubEmail struct {
+		Email      string `json:"email"`
+		Primary    bool   `json:"primary"`
+		Verified   bool   `json:"verified"`
+		Visibility string `json:"visibility"`
+	}
+	var githubEmails []GithubEmail
+
+	req, err := http.NewRequest("GET", "https://api.github.com/user/emails", nil)
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Add("Authorization", "token "+token.AccessToken)
+	response, err := httpClient.Do(req)
+	if err != nil {
+		panic(err)
+	}
+	defer response.Body.Close()
+	contents, err := ioutil.ReadAll(response.Body)
+
+	err = json.Unmarshal(contents, &githubEmails)
+	if err != nil {
+		panic(err)
+	}
+	for _, v := range githubEmails {
+		if v.Primary == true {
+			res = v.Email
+			break
+		}
+	}
+	return res
+}
+
+func (idp *GithubIdProvider) GetLoginAndAvatar(httpClient *http.Client, token *oauth2.Token) (string, string) {
+	type GithubUser struct {
+		Login     string `json:"login"`
+		AvatarUrl string `json:"avatar_url"`
+	}
+	var githubUser GithubUser
+
+	req, err := http.NewRequest("GET", "https://api.github.com/user", nil)
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Add("Authorization", "token "+token.AccessToken)
+	response2, err := httpClient.Do(req)
+	if err != nil {
+		panic(err)
+	}
+	defer response2.Body.Close()
+	contents2, err := ioutil.ReadAll(response2.Body)
+	err = json.Unmarshal(contents2, &githubUser)
+	if err != nil {
+		panic(err)
+	}
+
+	return githubUser.Login, githubUser.AvatarUrl
+}

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
+}