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package admin
import (
"encoding/json"
"net/http"
"os"
"time"
"git.huntm.net/wedding/server/guest"
"github.com/golang-jwt/jwt/v5"
)
type AdminHandler struct {
adminStore adminStore
guestStore guest.GuestStore
}
type adminStore interface {
Find(admin Admin) (Admin, error)
}
type appError struct {
Error error
Message string
Code int
}
func NewAdminHandler(adminStore adminStore, guestStore guest.GuestStore) *AdminHandler {
return &AdminHandler{adminStore, guestStore}
}
func (adminHandler *AdminHandler) ServeHTTP(responseWriter http.ResponseWriter, request *http.Request) {
switch {
case request.Method == http.MethodOptions:
responseWriter.WriteHeader(http.StatusOK)
case request.Method == http.MethodPost && request.URL.Path == "/admin/login":
adminHandler.handleLogIn(responseWriter, request)
default:
responseWriter.WriteHeader(http.StatusNotFound)
}
}
func (adminHandler *AdminHandler) handleLogIn(responseWriter http.ResponseWriter, request *http.Request) {
token, err := adminHandler.logIn(request)
if err != nil {
http.Error(responseWriter, err.Message, err.Code)
} else {
responseWriter.Write(token)
}
}
func (adminHandler *AdminHandler) logIn(request *http.Request) ([]byte, *appError) {
requestAdmin, err := adminHandler.decodeCredentials(request)
if err != nil {
return []byte{}, &appError{err, "failed to unmarshal request", http.StatusBadRequest}
}
_, err = adminHandler.adminStore.Find(requestAdmin)
if err != nil {
return []byte{}, &appError{err, "admin not found", http.StatusUnauthorized}
}
expirationTime := adminHandler.setExpirationTime()
claims := adminHandler.createClaims(requestAdmin, expirationTime)
key, err := adminHandler.readKey()
if err != nil {
return []byte{}, &appError{err, "failed to read secret key", http.StatusInternalServerError}
}
token, err := adminHandler.createToken(claims, key)
if err != nil {
return []byte{}, &appError{err, "failed to create token", http.StatusInternalServerError}
}
guests, err := adminHandler.guestStore.Get()
if err != nil {
return []byte{}, &appError{err, "failed to get guests", http.StatusInternalServerError}
}
jsonBytes, err := adminHandler.marshalResponse(guests, token)
if err != nil {
return []byte{}, &appError{err, "failed to marshal response", http.StatusInternalServerError}
}
return jsonBytes, nil
}
func (adminHandler *AdminHandler) decodeCredentials(request *http.Request) (Admin, error) {
var admin Admin
err := json.NewDecoder(request.Body).Decode(&admin)
defer request.Body.Close()
return admin, err
}
func (adminHandler *AdminHandler) setExpirationTime() time.Time {
return time.Now().Add(15 * time.Minute)
}
func (adminHandler *AdminHandler) createClaims(admin Admin, expirationTime time.Time) *Claims {
return &Claims{
admin,
jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(expirationTime),
},
}
}
func (adminHandler *AdminHandler) readKey() ([]byte, error) {
// TODO: use properties file
return os.ReadFile("C:\\Users\\mhunt\\admin.pem")
}
func (adminHandler *AdminHandler) createToken(claims *Claims, key []byte) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString(key)
}
func (adminHandler *AdminHandler) marshalResponse(guests []guest.Guest, token string) ([]byte, error) {
loginResponse := adminHandler.createLoginResponse(guests, token)
return json.Marshal(loginResponse)
}
func (adminHandler *AdminHandler) createLoginResponse(guests []guest.Guest, token string) *LoginResponse {
return &LoginResponse{guests, token}
}
|
