feat: add wecom internal support (#452)

Signed-off-by: 0x2a <stevesough@gmail.com>

idp/wecom_inter.go

@@ -0,0 +1,167 @@
+// 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"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"golang.org/x/oauth2"
+)
+
+//This idp is using wecom internal application api as idp
+type WeComInternalIdProvider struct {
+	Client *http.Client
+	Config *oauth2.Config
+}
+
+func NewWeComInternalIdProvider(clientId string, clientSecret string, redirectUrl string) *WeComInternalIdProvider {
+	idp := &WeComInternalIdProvider{}
+
+	config := idp.getConfig(clientId, clientSecret, redirectUrl)
+	idp.Config = config
+
+	return idp
+}
+
+func (idp *WeComInternalIdProvider) SetHttpClient(client *http.Client) {
+	idp.Client = client
+}
+
+func (idp *WeComInternalIdProvider) getConfig(clientId string, clientSecret string, redirectUrl string) *oauth2.Config {
+	var config = &oauth2.Config{
+		ClientID:     clientId,
+		ClientSecret: clientSecret,
+		RedirectURL:  redirectUrl,
+	}
+
+	return config
+}
+
+type WecomInterToken struct {
+	Errcode     int    `json:"errcode"`
+	Errmsg      string `json:"errmsg"`
+	AccessToken string `json:"access_token"`
+	ExpiresIn   int    `json:"expires_in"`
+}
+
+// GetToken use code get access_token (*operation of getting code ought to be done in front)
+// get more detail via: https://developer.work.weixin.qq.com/document/path/91039
+func (idp *WeComInternalIdProvider) GetToken(code string) (*oauth2.Token, error) {
+	pTokenParams := &struct {
+		CorpId     string `json:"corpid"`
+		Corpsecret string `json:"corpsecret"`
+	}{idp.Config.ClientID, idp.Config.ClientSecret}
+	resp, err := idp.Client.Get(fmt.Sprintf("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=%s&corpsecret=%s", pTokenParams.CorpId, pTokenParams.Corpsecret))
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	pToken := &WecomInterToken{}
+	err = json.Unmarshal(data, pToken)
+	if err != nil {
+		return nil, err
+	}
+	if pToken.Errcode != 0 {
+		return nil, fmt.Errorf("pToken.Errcode = %d, pToken.Errmsg = %s", pToken.Errcode, pToken.Errmsg)
+	}
+
+	token := &oauth2.Token{
+		AccessToken: pToken.AccessToken,
+		Expiry:      time.Unix(time.Now().Unix()+int64(pToken.ExpiresIn), 0),
+	}
+
+	raw := make(map[string]interface{})
+	raw["code"] = code
+	token = token.WithExtra(raw)
+
+	return token, nil
+}
+
+type WecomInternalUserResp struct {
+	Errcode int    `json:"errcode"`
+	Errmsg  string `json:"errmsg"`
+	UserId  string `json:"UserId"`
+	OpenId  string `json:"OpenId"`
+}
+
+type WecomInternalUserInfo struct {
+	Errcode int    `json:"errcode"`
+	Errmsg  string `json:"errmsg"`
+	Name    string `json:"name"`
+	Email   string `json:"email"`
+	Avatar  string `json:"avatar"`
+	OpenId  string `json:"open_userid"`
+}
+
+func (idp *WeComInternalIdProvider) GetUserInfo(token *oauth2.Token) (*UserInfo, error) {
+	//Get userid first
+	accessToken := token.AccessToken
+	code := token.Extra("code").(string)
+	resp, err := idp.Client.Get(fmt.Sprintf("https://qyapi.weixin.qq.com/cgi-bin/user/getuserinfo?access_token=%s&code=%s", accessToken, code))
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	userResp := &WecomInternalUserResp{}
+	err = json.Unmarshal(data, userResp)
+	if err != nil {
+		return nil, err
+	}
+	if userResp.Errcode != 0 {
+		return nil, fmt.Errorf("userIdResp.Errcode = %d, userIdResp.Errmsg = %s", userResp.Errcode, userResp.Errmsg)
+	}
+	if userResp.OpenId != "" {
+		return nil, fmt.Errorf("not an internal user")
+	}
+	//Use userid and accesstoken to get user information
+	resp, err = idp.Client.Get(fmt.Sprintf("https://qyapi.weixin.qq.com/cgi-bin/user/get?access_token=%s&userid=%s", accessToken, userResp.UserId))
+	if err != nil {
+		return nil, err
+	}
+
+	data, err = io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	infoResp := &WecomInternalUserInfo{}
+	err = json.Unmarshal(data, infoResp)
+	if err != nil {
+		return nil, err
+	}
+	if infoResp.Errcode != 0 {
+		return nil, fmt.Errorf("userInfoResp.errcode = %d, userInfoResp.errmsg = %s", infoResp.Errcode, infoResp.Errmsg)
+	}
+	userInfo := UserInfo{
+		Id:          infoResp.OpenId,
+		Username:    infoResp.Name,
+		DisplayName: infoResp.Name,
+		Email:       infoResp.Email,
+		AvatarUrl:   infoResp.Avatar,
+	}
+
+	return &userInfo, nil
+}