feat: add Douyin OAuth provider (#753)

idp/douyin.go

@@ -0,0 +1,198 @@
+// Copyright 2022 The Casdoor 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 (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"time"
+
+	"golang.org/x/oauth2"
+)
+
+type DouyinIdProvider struct {
+	Client *http.Client
+	Config *oauth2.Config
+}
+
+func NewDouyinIdProvider(clientId string, clientSecret string, redirectUrl string) *DouyinIdProvider {
+	idp := &DouyinIdProvider{}
+	idp.Config = idp.getConfig(clientId, clientSecret, redirectUrl)
+	return idp
+}
+
+func (idp *DouyinIdProvider) SetHttpClient(client *http.Client) {
+	idp.Client = client
+}
+
+func (idp *DouyinIdProvider) getConfig(clientId string, clientSecret string, redirectUrl string) *oauth2.Config {
+	var endpoint = oauth2.Endpoint{
+		TokenURL: "https://open.douyin.com/oauth/access_token",
+		AuthURL:  "https://open.douyin.com/platform/oauth/connect",
+	}
+
+	var config = &oauth2.Config{
+		Scopes:       []string{"user_info"},
+		Endpoint:     endpoint,
+		ClientID:     clientId,
+		ClientSecret: clientSecret,
+		RedirectURL:  redirectUrl,
+	}
+
+	return config
+}
+
+// get more details via: https://open.douyin.com/platform/doc?doc=docs/openapi/account-permission/get-access-token
+/*
+{
+  "data": {
+    "access_token": "access_token",
+    "description": "",
+    "error_code": "0",
+    "expires_in": "86400",
+    "open_id": "aaa-bbb-ccc",
+    "refresh_expires_in": "86400",
+    "refresh_token": "refresh_token",
+    "scope": "user_info"
+  },
+  "message": "<nil>"
+}
+*/
+
+type DouyinTokenResp struct {
+	Data struct {
+		AccessToken  string `json:"access_token"`
+		ExpiresIn    int64  `json:"expires_in"`
+		OpenId       string `json:"open_id"`
+		RefreshToken string `json:"refresh_token"`
+		Scope        string `json:"scope"`
+	} `json:"data"`
+	Message string `json:"message"`
+}
+
+// GetToken use code to get access_token
+// get more details via: https://open.douyin.com/platform/doc?doc=docs/openapi/account-permission/get-access-token
+func (idp *DouyinIdProvider) GetToken(code string) (*oauth2.Token, error) {
+	payload := url.Values{}
+	payload.Set("code", code)
+	payload.Set("grant_type", "authorization_code")
+	payload.Set("client_key", idp.Config.ClientID)
+	payload.Set("client_secret", idp.Config.ClientSecret)
+	resp, err := idp.Client.PostForm(idp.Config.Endpoint.TokenURL, payload)
+	if err != nil {
+		return nil, err
+	}
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	tokenResp := &DouyinTokenResp{}
+	err = json.Unmarshal(data, tokenResp)
+	if err != nil {
+		return nil, fmt.Errorf("fail to unmarshal token response: %s", err.Error())
+	}
+
+	token := &oauth2.Token{
+		AccessToken:  tokenResp.Data.AccessToken,
+		RefreshToken: tokenResp.Data.RefreshToken,
+		Expiry:       time.Unix(time.Now().Unix()+tokenResp.Data.ExpiresIn, 0),
+	}
+
+	raw := make(map[string]interface{})
+	raw["open_id"] = tokenResp.Data.OpenId
+	token = token.WithExtra(raw)
+
+	return token, nil
+}
+
+// get more details via: https://open.douyin.com/platform/doc?doc=docs/openapi/account-management/get-account-open-info
+/*
+{
+  "data": {
+    "avatar": "https://example.com/x.jpeg",
+    "city": "上海",
+    "country": "中国",
+    "description": "",
+    "e_account_role": "<nil>",
+    "error_code": "0",
+    "gender": "<nil>",
+    "nickname": "张伟",
+    "open_id": "0da22181-d833-447f-995f-1beefea5bef3",
+    "province": "上海",
+    "union_id": "1ad4e099-4a0c-47d1-a410-bffb4f2f64a4"
+  }
+}
+*/
+
+type DouyinUserInfo struct {
+	Data struct {
+		Avatar  string `json:"avatar"`
+		City    string `json:"city"`
+		Country string `json:"country"`
+		// 0->unknown, 1->male, 2->female
+		Gender   int64  `json:"gender"`
+		Nickname string `json:"nickname"`
+		OpenId   string `json:"open_id"`
+		Province string `json:"province"`
+	} `json:"data"`
+}
+
+// GetUserInfo use token to get user profile
+func (idp *DouyinIdProvider) GetUserInfo(token *oauth2.Token) (*UserInfo, error) {
+	body := &struct {
+		AccessToken string `json:"access_token"`
+		OpenId      string `json:"open_id"`
+	}{token.AccessToken, token.Extra("open_id").(string)}
+	data, err := json.Marshal(body)
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequest("GET", "https://open.douyin.com/oauth/userinfo/", bytes.NewReader(data))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Add("access-token", token.AccessToken)
+	req.Header.Add("Accept", "application/json")
+	req.Header.Add("Content-Type", "application/json")
+	resp, err := idp.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+
+	respBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var douyinUserInfo DouyinUserInfo
+	err = json.Unmarshal(respBody, &douyinUserInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	userInfo := UserInfo{
+		Id:          douyinUserInfo.Data.OpenId,
+		Username:    douyinUserInfo.Data.Nickname,
+		DisplayName: douyinUserInfo.Data.Nickname,
+		AvatarUrl:   douyinUserInfo.Data.Avatar,
+	}
+	return &userInfo, nil
+}

idp/provider.go

@@ -86,6 +86,8 @@ func GetIdProvider(typ string, subType string, clientId string, clientSecret str
 		return NewCasdoorIdProvider(clientId, clientSecret, redirectUrl, hostUrl)
 	} else if typ == "Okta" {
 		return NewOktaIdProvider(clientId, clientSecret, redirectUrl, hostUrl)
+	} else if typ == "Douyin" {
+		return NewDouyinIdProvider(clientId, clientSecret, redirectUrl)
 	} else if isGothSupport(typ) {
 		return NewGothIdProvider(typ, clientId, clientSecret, redirectUrl)
 	} else if typ == "Bilibili" {