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|
package main
import (
"errors"
"fmt"
"log"
"net/http"
"net/url"
"time"
jwt "github.com/golang-jwt/jwt/v4"
"riedstra.dev/mitch/go-website/page"
"riedstra.dev/mitch/go-website/users"
)
var ErrInvalidJWTToken = errors.New("invalid JWT token")
func (a *App) Err5xx(w http.ResponseWriter, r *http.Request,
statusCode int, title, desc string) {
page.Render5xx(w, r, map[string]interface{}{
"Error": title,
"Description": desc,
}, statusCode)
}
func (a *App) Err500Default(w http.ResponseWriter, r *http.Request) {
a.Err5xx(w, r, http.StatusInternalServerError, "Internal server error",
"Internal server error.")
}
func (a *App) LogoutHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.SetCookie(w, &http.Cookie{
Name: "Auth",
HttpOnly: a.auth.HTTPOnly,
SameSite: a.auth.SameSiteStrict,
Secure: a.auth.Secure,
Value: "logout",
Expires: time.Now().Add(time.Second),
})
http.Redirect(w, r, "/", http.StatusFound)
})
}
func (a *App) LoginHandler() http.Handler { //nolint
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
loggedIn := a.IsLoggedIn(r)
next, _ := url.Parse(r.URL.Query().Get("next"))
if r.Method == "GET" && !loggedIn {
page.RenderForPath(w, r, "login")
return
}
if r.Method == "GET" && loggedIn {
if next.Path != "" {
http.Redirect(w, r, next.Path, http.StatusFound)
return
}
http.Redirect(w, r, "/dashboard", http.StatusFound)
return
}
if r.Method != "POST" {
a.Err500Default(w, r)
return
}
username := r.FormValue("username")
password := r.FormValue("password")
var (
err error
u *users.SiteUser
found = false
)
for _, u = range a.auth.Users {
if u.Username == username {
err = u.CheckPassword(password)
found = true
}
}
if err != nil || !found {
page.Render(w, r, "login", map[string]interface{}{
"Error": "Invalid username or password",
"Username": username,
}, http.StatusUnauthorized)
return
}
token := jwt.NewWithClaims(jwt.SigningMethodHS512, &jwt.StandardClaims{
ExpiresAt: time.Now().Add(
time.Hour * time.Duration(a.auth.LoginHours)).Unix(),
Id: u.Username,
})
ss, err := token.SignedString([]byte(a.auth.TokenKey))
if err != nil {
log.Println("login: encountered while setting up JWT: ", err)
a.Err500Default(w, r)
return
}
http.SetCookie(w, &http.Cookie{
Name: "Auth",
HttpOnly: a.auth.HTTPOnly,
SameSite: a.auth.SameSiteStrict,
Secure: a.auth.Secure,
Value: ss,
})
http.Redirect(w, r, "/login", http.StatusFound)
})
}
func (a *App) IsLoggedIn(r *http.Request) bool {
_, err := a.GetAuthToken(r)
if err != nil {
log.Printf("%s IsLoggedIn: false", r.URL.Path)
return false
}
log.Printf("%s IsLoggedIn: true", r.URL.Path)
return true
}
func (a *App) GetAuthToken(r *http.Request) (*jwt.Token, error) {
c, err := r.Cookie("Auth")
if err != nil {
return nil, fmt.Errorf("getting auth token: %w", err)
}
token, err := jwt.Parse(c.Value,
func(token *jwt.Token) (interface{}, error) {
return []byte(a.auth.TokenKey), nil
},
)
if err != nil {
return nil, fmt.Errorf("while parsing jwt %w", err)
}
if !token.Valid {
return token, ErrInvalidJWTToken
}
return token, nil
}
func (a *App) RequiresLogin(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !a.IsLoggedIn(r) {
log.Printf("Unauthorized request %s %s", r.Method, r.URL.Path)
page.Render(w, r, "login", map[string]interface{}{
"Error": "You must login to view this page",
}, http.StatusUnauthorized)
return
}
next.ServeHTTP(w, r)
})
}
|
