126 lines
3.7 KiB
Go
126 lines
3.7 KiB
Go
package security
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import (
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"errors"
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"net/http"
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"strings"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"github.com/labstack/echo/v5"
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"trankilou.fr/lassistanoque/backend/internal/config"
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"trankilou.fr/lassistanoque/backend/internal/domain"
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"trankilou.fr/lassistanoque/backend/internal/service/auth"
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)
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// Claims personnalisées embarquées dans le JWT.
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type Claims struct {
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UserID string `json:"uid"`
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Email string `json:"email"`
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Firstname string `json:"firstname"`
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Lastname string `json:"lastname"`
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jwt.RegisteredClaims
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}
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type JwtTokenManager struct {
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secret []byte
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accessTTL time.Duration
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refreshTTL time.Duration
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issuer string
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}
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func NewJwtTokenManager(accessTTL, refreshTTL time.Duration, issuer string) *JwtTokenManager {
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cfg := config.GetConfig()
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return &JwtTokenManager{
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secret: []byte(cfg.JWTSecret),
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accessTTL: accessTTL,
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refreshTTL: refreshTTL,
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issuer: issuer,
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}
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}
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// GenerateAccessToken crée un JWT de courte durée (ex: 15 min) utilisé
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// pour authentifier les requêtes API.
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func (tm *JwtTokenManager) GenerateAccessToken(user *domain.User) (string, time.Time, error) {
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expiresAt := time.Now().Add(tm.accessTTL)
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claims := Claims{
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UserID: user.ID,
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Email: user.Email,
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Firstname: user.Firstname,
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Lastname: user.Lastname,
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: tm.issuer,
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Subject: user.ID,
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ExpiresAt: jwt.NewNumericDate(expiresAt),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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signed, err := token.SignedString(tm.secret)
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return signed, expiresAt, err
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}
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// GenerateRefreshToken crée un token de longue durée (ex: 7 jours) utilisé
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// uniquement pour obtenir un nouvel access token, jamais pour appeler l'API directement.
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func (tm *JwtTokenManager) GenerateRefreshToken(userID string) (string, time.Time, error) {
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expiresAt := time.Now().Add(tm.refreshTTL)
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claims := jwt.RegisteredClaims{
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Issuer: tm.issuer,
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Subject: userID,
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ExpiresAt: jwt.NewNumericDate(expiresAt),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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signed, err := token.SignedString(tm.secret)
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return signed, expiresAt, err
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}
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// ParseAndValidate décode et vérifie la signature + l'expiration d'un JWT.
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func (tm *JwtTokenManager) ParseAndValidate(tokenString string) (*domain.User, error) {
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, errors.New("méthode de signature inattendue")
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}
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return tm.secret, nil
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})
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if err != nil {
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return nil, err
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}
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if !token.Valid {
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return nil, errors.New("token invalide")
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}
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return &domain.User{
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ID: claims.UserID,
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Email: claims.Email,
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Firstname: claims.Firstname,
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Lastname: claims.Lastname,
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}, nil
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}
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func (tm *JwtTokenManager) TokenMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c *echo.Context) error {
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header := c.Request().Header.Get("Authorization")
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if header == "" {
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return echo.NewHTTPError(http.StatusUnauthorized, "en-tête Authorization manquant")
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}
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parts := strings.SplitN(header, " ", 2)
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if len(parts) != 2 || parts[0] != "Bearer" {
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return echo.NewHTTPError(http.StatusUnauthorized, "format attendu: Bearer <token>")
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}
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claims, err := tm.ParseAndValidate(parts[1])
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if err != nil {
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return echo.NewHTTPError(http.StatusUnauthorized, "token invalide ou expiré")
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}
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// Rend les infos disponibles aux handlers suivants via c.Get(...)
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c.Set(auth.ContextUserIDKey, claims.ID)
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c.Set(auth.ContextEmailKey, claims.Email)
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c.Set(auth.ContextNameKey, claims.Firstname+" "+claims.Lastname)
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return next(c)
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}
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}
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