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package main
import (
"encoding/json"
"flag"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"os"
)
var (
clientSecret = flag.String("cs", "", "github oauth client secret")
clientID = flag.String("ci", "", "github oauth client id")
)
type Conf struct {
ClientId string
ClientSecret string
RedirectUrl string
}
type Token struct {
AccessToken string `json:"access_token"`
}
// 认证并获取用户信息
func OAuth(w http.ResponseWriter, r *http.Request) {
var (
err error
)
// 获取 code
code := r.URL.Query().Get("code")
// 通过 code, 获取 token
var tokenAuthUrl = GetTokenAuthURL(code)
var token *Token
if token, err = GetToken(tokenAuthUrl); err != nil {
fmt.Println(err)
return
}
// 通过token，获取用户信息
var userInfo map[string]interface{}
if userInfo, err = GetUserInfo(token); err != nil {
fmt.Println("获取用户信息失败，错误信息为:", err)
return
}
// 将用户信息返回前端
var userInfoBytes []byte
if userInfoBytes, err = json.Marshal(userInfo); err != nil {
fmt.Println("在将用户信息(map)转为用户信息([]byte)时发生错误，错误信息为:", err)
return
}
w.Header().Set("Content-Type", "application/json")
if _, err = w.Write(userInfoBytes); err != nil {
fmt.Println("在将用户信息([]byte)返回前端时发生错误，错误信息为:", err)
return
}
}
// 通过code获取token认证url
func GetTokenAuthURL(code string) string {
return fmt.Sprintf(
"https://github.com/login/oauth/access_token?client_id=%s&client_secret=%s&code=%s",
*clientID, *clientSecret, code,
)
}
// 获取 token
func GetToken(url string) (*Token, error) {
// 形成请求
var req *http.Request
var err error
if req, err = http.NewRequest(http.MethodGet, url, nil); err != nil {
return nil, err
}
req.Header.Set("accept", "application/json")
// 发送请求并获得响应
var (
httpClient = http.Client{}
res *http.Response
respBody = make([]byte, 0)
token Token
)
if res, err = httpClient.Do(req); err != nil {
return nil, err
}
respBody, err = ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
log.Printf("token: %s", string(respBody))
// 将响应体解析为 token，并返回
err = json.Unmarshal(respBody, &token)
if err != nil {
return nil, err
}
return &token, nil
}
// 获取用户信息
func GetUserInfo(token *Token) (map[string]interface{}, error) {
// 形成请求
var userInfoUrl = "https://api.github.com/user" // github用户信息获取接口
var req *http.Request
var err error
if req, err = http.NewRequest(http.MethodGet, userInfoUrl, nil); err != nil {
return nil, err
}
req.Header.Set("accept", "application/json")
req.Header.Set("Authorization", fmt.Sprintf("token %s", token.AccessToken))
// 发送请求并获取响应
var client = http.Client{}
var res *http.Response
if res, err = client.Do(req); err != nil {
return nil, err
}
// 将响应的数据写入 userInfo 中，并返回
var userInfo = make(map[string]interface{})
if err = json.NewDecoder(res.Body).Decode(&userInfo); err != nil {
return nil, err
}
return userInfo, nil
}
func Html(w http.ResponseWriter, r *http.Request) {
// 解析指定文件生成模板对象
var (
temp *template.Template
err error
)
dir, _ := os.Getwd()
if temp, err = template.ParseFiles(dir + "/oauth.html"); err != nil {
fmt.Println("读取文件失败，错误信息为:", err)
return
}
// 利用给定数据渲染模板(html页面)，并将结果写入w，返回给前端
if err = temp.Execute(w, Conf{
ClientId: *clientID,
ClientSecret: *clientSecret,
RedirectUrl: "http://127.0.0.1:9000/oauth/callback",
}); err != nil {
fmt.Println("读取渲染html页面失败，错误信息为:", err)
return
}
}
func UserInfo(w http.ResponseWriter, r *http.Request) {
token := r.URL.Query().Get("token")
log.Printf("UserInfo token: %s", token)
var (
err error
userInfo map[string]interface{}
)
if userInfo, err = GetUserInfo(&Token{AccessToken: token}); err != nil {
fmt.Println("获取用户信息失败，错误信息为:", err)
return
}
// 将用户信息返回前端
var userInfoBytes []byte
if userInfoBytes, err = json.Marshal(userInfo); err != nil {
fmt.Println("在将用户信息(map)转为用户信息([]byte)时发生错误，错误信息为:", err)
return
}
w.Header().Set("Content-Type", "application/json")
if _, err = w.Write(userInfoBytes); err != nil {
fmt.Println("在将用户信息([]byte)返回前端时发生错误，错误信息为:", err)
return
}
}
func main() {
flag.Parse()
log.Printf("clientSecrets: %s,clientID: %s", *clientSecret, *clientID)
if *clientSecret == "" || *clientID == "" {
log.Fatal("clientSecrets or clientID is required")
}
http.HandleFunc("/", Html)
http.HandleFunc("/oauth/callback", OAuth)
http.HandleFunc("/getUserInfo", UserInfo)
if err := http.ListenAndServe(":9000", nil); err != nil {
fmt.Println("监听失败，错误信息为:", err)
return
}
}
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