WIP, but this is going to become my new blog CMS
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"time"
"github.com/dgrijalva/jwt-go"
)
func checkCredentials(username, password string) bool {
return username == appConfig.User.Nick && password == appConfig.User.Password
}
func jwtKey() []byte {
return []byte(appConfig.Server.JWTSecret)
}
func authMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// 1. Check basic auth
username, password, basicauth := r.BasicAuth()
if basicauth && checkCredentials(username, password) {
next.ServeHTTP(w, r)
return
}
// 2. Check JWT
if tokenCookie, err := r.Cookie("token"); err == nil {
if tkn, err := jwt.Parse(tokenCookie.Value, func(t *jwt.Token) (interface{}, error) {
return jwtKey(), nil
}); err == nil && tkn.Valid {
next.ServeHTTP(w, r)
return
}
}
// 3. Show login form
w.WriteHeader(http.StatusUnauthorized)
h, _ := json.Marshal(r.Header.Clone())
b, _ := ioutil.ReadAll(io.LimitReader(r.Body, 2000000)) // Only allow 20 Megabyte
_ = r.Body.Close()
if len(b) == 0 {
// Maybe it's a form
_ = r.ParseForm()
b = []byte(r.PostForm.Encode())
}
render(w, templateLogin, &renderData{
Data: map[string]string{
"loginmethod": r.Method,
"loginheaders": base64.StdEncoding.EncodeToString(h),
"loginbody": base64.StdEncoding.EncodeToString(b),
},
})
})
}
func checkIsLogin(next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if !checkLogin(rw, r) {
next.ServeHTTP(rw, r)
}
})
}
func checkLogin(w http.ResponseWriter, r *http.Request) bool {
if r.Method == http.MethodPost &&
r.Header.Get(contentType) == contentTypeWWWForm &&
r.FormValue("loginaction") == "login" &&
checkCredentials(r.FormValue("username"), r.FormValue("password")) {
// Do original request
loginbody, _ := base64.StdEncoding.DecodeString(r.FormValue("loginbody"))
req, _ := http.NewRequest(r.FormValue("loginmethod"), r.RequestURI, bytes.NewReader(loginbody))
// Copy original headers
loginheaders, _ := base64.StdEncoding.DecodeString(r.FormValue("loginheaders"))
var headers http.Header
json.Unmarshal(loginheaders, &headers)
for k, v := range headers {
req.Header[k] = v
}
// Set basic auth
req.SetBasicAuth(r.FormValue("username"), r.FormValue("password"))
// Send cookie
sendTokenCookie(w, r)
// Serve original request
d.ServeHTTP(w, req)
return true
}
return false
}
func sendTokenCookie(w http.ResponseWriter, r *http.Request) {
expiration := time.Now().Add(7 * 24 * time.Hour)
tokenString, err := jwt.NewWithClaims(jwt.SigningMethodHS256, &jwt.StandardClaims{ExpiresAt: expiration.Unix()}).SignedString(jwtKey())
if err != nil {
serveError(w, r, "Failed to sign JWT", http.StatusInternalServerError)
return
}
http.SetCookie(w, &http.Cookie{
Name: "token",
Value: tokenString,
Expires: expiration,
Secure: true,
HttpOnly: true,
SameSite: http.SameSiteStrictMode,
})
return
}