Initial commit: TaskPool React panel

- React frontend with route-level code splitting
- Backend rebranded from Baihu to TaskPool
- DB brand migration script and local compatibility

internal/utils/token.go

@@ -0,0 +1,52 @@
+package utils
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserID       string `json:"user_id"`
+	Username     string `json:"username"`
+	TokenVersion int    `json:"version"`
+	jwt.RegisteredClaims
+}
+
+// GenerateToken 生成 JWT token
+func GenerateToken(userID string, username string, version int, expireDays int, secret string) (string, error) {
+	claims := Claims{
+		UserID:       userID,
+		Username:     username,
+		TokenVersion: version,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Duration(expireDays) * 24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+// ParseToken 解析 JWT token
+func ParseToken(tokenString string, secret string) (string, string, int, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (any, error) {
+		// 校验算法
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return []byte(secret), nil
+	})
+
+	if err != nil {
+		return "", "", 0, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims.UserID, claims.Username, claims.TokenVersion, nil
+	}
+
+	return "", "", 0, errors.New("invalid token")
+}