Backend: API handlers, WebSocket manager, K8s client, CRDT, auth

server/internal/auth/token.go

@@ -0,0 +1,74 @@
+package auth
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
+)
+
+type Claims struct {
+	UserID   string `json:"user_id"`
+	Username string `json:"username"`
+	jwt.RegisteredClaims
+}
+
+type TokenManager struct {
+	secretKey string
+}
+
+func NewTokenManager(secretKey string) *TokenManager {
+	return &TokenManager{
+		secretKey: secretKey,
+	}
+}
+
+func (tm *TokenManager) CreateToken(userID, username string) (string, error) {
+	claims := &Claims{
+		UserID:   userID,
+		Username: username,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			NotBefore: jwt.NewNumericDate(time.Now()),
+		},
+	}
+	
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenString, err := token.SignedString([]byte(tm.secretKey))
+	if err != nil {
+		return "", err
+	}
+	
+	return tokenString, nil
+}
+
+func (tm *TokenManager) ValidateToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		return []byte(tm.secretKey), nil
+	})
+	
+	if err != nil || !token.Valid {
+		return nil, err
+	}
+	
+	claims, ok := token.Claims.(*Claims)
+	if !ok {
+		return nil, jwt.ErrSignatureInvalid
+	}
+	
+	return claims, nil
+}
+
+func ExtractToken(ctx context.Context) string {
+	// Extract token fromAuthorization header
+	authHeader := ctx.Value("Authorization")
+	if authHeader != nil {
+		header := authHeader.(string)
+		if strings.HasPrefix(header, "Bearer ") {
+			return strings.TrimPrefix(header, "Bearer ")
+		}
+	}
+	return ""
+}