新增 Web 浏览端(Go+Vue 报表系统)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/backend/internal/auth/jwt.go

@@ -0,0 +1,55 @@
+package auth
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+const tokenTTL = 12 * time.Hour
+
+type Claims struct {
+	UserID   int64  `json:"uid"`
+	Username string `json:"usr"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+type Manager struct{ secret []byte }
+
+func NewManager(secret []byte) *Manager { return &Manager{secret: secret} }
+
+func (m *Manager) Issue(userID int64, username, role string) (string, time.Time, error) {
+	exp := time.Now().Add(tokenTTL)
+	claims := Claims{
+		UserID:   userID,
+		Username: username,
+		Role:     role,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(exp),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	tok := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	s, err := tok.SignedString(m.secret)
+	return s, exp, err
+}
+
+func (m *Manager) Parse(tokenStr string) (*Claims, error) {
+	tok, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (any, error) {
+		if t.Method.Alg() != jwt.SigningMethodHS256.Alg() {
+			return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
+		}
+		return m.secret, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := tok.Claims.(*Claims)
+	if !ok || !tok.Valid {
+		return nil, errors.New("invalid token")
+	}
+	return claims, nil
+}