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package api
import (
"crypto/rand"
"encoding/base64"
"encoding/json"
"log"
"net/http"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"golang.org/x/crypto/bcrypt"
)
type AuthHandler struct {
username string
passwordHash string
jwtSecret []byte
}
type loginRequest struct {
Username string `json:"username"`
Password string `json:"password"`
}
type Claims struct {
Username string `json:"username"`
jwt.RegisteredClaims
}
func NewAuthHandler(username, passwordHash, jwtSecret string) *AuthHandler {
if username == "" {
username = "admin"
}
secret := []byte(jwtSecret)
if len(secret) == 0 {
key := make([]byte, 32)
if _, err := rand.Read(key); err != nil {
secret = []byte("dev-secret-do-not-use-in-production")
} else {
secret = []byte(base64.RawURLEncoding.EncodeToString(key))
}
log.Println("[auth] jwt_secret nao configurado — usando chave gerada aleatoriamente")
}
if passwordHash == "" {
log.Fatal("[auth] ADMIN_PASSWORD_HASH ou ADMIN_PASSWORD deve ser definido")
}
return &AuthHandler{
username: username,
passwordHash: passwordHash,
jwtSecret: secret,
}
}
func (a *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
var req loginRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSON(w, http.StatusBadRequest, map[string]string{"error": "json invalido"})
return
}
if req.Username != a.username {
writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "credenciais invalidas"})
return
}
if err := bcrypt.CompareHashAndPassword([]byte(a.passwordHash), []byte(req.Password)); err != nil {
writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "credenciais invalidas"})
return
}
now := time.Now()
claims := Claims{
Username: req.Username,
RegisteredClaims: jwt.RegisteredClaims{
IssuedAt: jwt.NewNumericDate(now),
ExpiresAt: jwt.NewNumericDate(now.Add(7 * 24 * time.Hour)),
Subject: req.Username,
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
signed, err := token.SignedString(a.jwtSecret)
if err != nil {
writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "erro ao gerar token"})
return
}
writeJSON(w, http.StatusOK, map[string]string{"token": signed})
}
func (a *AuthHandler) Verify(w http.ResponseWriter, r *http.Request) {
tokenStr := extractToken(r)
if tokenStr == "" {
writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "token ausente"})
return
}
if !a.validateToken(tokenStr) {
writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "token invalido ou expirado"})
return
}
w.WriteHeader(http.StatusNoContent)
}
func (a *AuthHandler) Middleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.URL.Path, "/api/auth/") {
next.ServeHTTP(w, r)
return
}
if r.Method == http.MethodGet || r.Method == http.MethodOptions {
next.ServeHTTP(w, r)
return
}
tokenStr := extractToken(r)
if tokenStr == "" || !a.validateToken(tokenStr) {
writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "nao autorizado"})
return
}
next.ServeHTTP(w, r)
})
}
func (a *AuthHandler) validateToken(tokenStr string) bool {
claims := &Claims{}
token, err := jwt.ParseWithClaims(tokenStr, claims, func(t *jwt.Token) (any, error) {
return a.jwtSecret, nil
})
if err != nil || !token.Valid {
return false
}
return claims.Username == a.username
}
func extractToken(r *http.Request) string {
auth := r.Header.Get("Authorization")
if strings.HasPrefix(auth, "Bearer ") {
return strings.TrimPrefix(auth, "Bearer ")
}
cookie, err := r.Cookie("auth_token")
if err == nil && cookie.Value != "" {
return cookie.Value
}
return ""
}
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