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| package main
import (
"context"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"golang.org/x/oauth2"
"golang.org/x/oauth2/github"
)
var (
githubOauthConfig = &oauth2.Config{
ClientID: "Ov23liHgJhetSUt45V9r",
ClientSecret: "ClientSecret",
RedirectURL: "http://localhost:8080/callback",
Endpoint: github.Endpoint,
Scopes: []string{"user:email"},
}
oauthStateString = "random"
)
func main() {
http.HandleFunc("/", handleMain)
http.HandleFunc("/login", handleGitHubLogin)
http.HandleFunc("/callback", handleGitHubCallback)
http.HandleFunc("/logout", handleLogout)
log.Println("Started running on http://localhost:8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}
func handleMain(w http.ResponseWriter, r *http.Request) {
var htmlIndex = `<html><body><a href="/login">Log in with GitHub</a></body></html>`
io.WriteString(w, htmlIndex)
}
func handleGitHubLogin(w http.ResponseWriter, r *http.Request) {
url := githubOauthConfig.AuthCodeURL(oauthStateString)
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
type GitHubUser struct {
Login string `json:"login"`
ID int `json:"id"`
AvatarURL string `json:"avatar_url"`
HTMLURL string `json:"html_url"`
Name string `json:"name"`
Company string `json:"company"`
Blog string `json:"blog"`
Location string `json:"location"`
Email string `json:"email"`
Bio string `json:"bio"`
}
func handleGitHubCallback(w http.ResponseWriter, r *http.Request) {
if r.FormValue("state") != oauthStateString {
log.Println("invalid oauth state")
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
token, err := githubOauthConfig.Exchange(context.Background(), r.FormValue("code"))
if err != nil {
log.Println("code exchange failed: ", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
client := githubOauthConfig.Client(context.Background(), token)
resp, err := client.Get("https://api.github.com/user")
if err != nil {
log.Println("failed getting user info: ", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
defer resp.Body.Close()
var user GitHubUser
if err := json.NewDecoder(resp.Body).Decode(&user); err != nil {
log.Println("failed decoding response body: ", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
fmt.Fprintf(w, `<html><body>
<h1>User Info</h1>
<p><strong>Login:</strong> %s</p>
<p><strong>ID:</strong> %d</p>
<p><strong>Avatar URL:</strong> <img src="%s" alt="avatar" ></p>
<p><strong>Profile URL:</strong> <a href="%s">%s</a></p>
<p><strong>Name:</strong> %s</p>
<p><strong>Company:</strong> %s</p>
<p><strong>Blog:</strong> %s</p>
<p><strong>Location:</strong> %s</p>
<p><strong>Email:</strong> %s</p>
<p><strong>Bio:</strong> %s</p>
</body></html>`,
user.Login,
user.ID,
user.AvatarURL,
user.HTMLURL, user.HTMLURL,
user.Name,
user.Company,
user.Blog,
user.Location,
user.Email,
user.Bio)
}
func handleLogout(w http.ResponseWriter, r *http.Request) {
http.SetCookie(w, &http.Cookie{
Name: "github_oauth_token",
Value: "",
Path: "/",
MaxAge: -1,
})
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}
|
