go first commit

go_cloud/pkg/jwt/jwt.go

@@ -0,0 +1,84 @@
+package jwt
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"go.b0esche.cloud/backend/internal/database"
+
+	"github.com/golang-jwt/jwt/v4"
+	"github.com/google/uuid"
+)
+
+type Claims struct {
+	UserID    string   `json:"user_id"`
+	OrgIDs    []string `json:"org_ids"`
+	SessionID string   `json:"session_id"`
+	jwt.RegisteredClaims
+}
+
+type Manager struct {
+	secret []byte
+}
+
+func NewManager(secret string) *Manager {
+	return &Manager{secret: []byte(secret)}
+}
+
+func (m *Manager) Generate(userID string, orgIDs []string, sessionID string) (string, error) {
+	claims := Claims{
+		UserID:    userID,
+		OrgIDs:    orgIDs,
+		SessionID: sessionID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(15 * time.Minute)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(m.secret)
+}
+
+func (m *Manager) Validate(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return m.secret, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, errors.New("invalid token")
+}
+
+func (m *Manager) ValidateWithSession(ctx context.Context, tokenString string, db *database.DB) (*Claims, *database.Session, error) {
+	claims, err := m.Validate(tokenString)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	sessionID, err := uuid.Parse(claims.SessionID)
+	if err != nil {
+		return nil, nil, errors.New("invalid session ID in token")
+	}
+
+	session, err := db.GetSession(ctx, sessionID)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if session.RevokedAt != nil || time.Now().After(session.ExpiresAt) {
+		return nil, nil, errors.New("session invalid")
+	}
+
+	return claims, session, nil
+}