chore: initial commit

internal/middleware/jwt.go

@@ -0,0 +1,184 @@
+package middleware
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"server/internal/config"
+	"server/internal/pkg/errs"
+	"server/internal/pkg/httputil"
+	"strings"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type JWTMiddleware struct {
+	cfg *config.JWTConfig
+}
+
+type contextKey string
+
+const UserContextKey contextKey = "user"
+
+const RefreshTokenType = "refresh"
+
+type Claims struct {
+	UserID int32 `json:"user_id"`
+	jwt.RegisteredClaims
+}
+
+type RefreshClaims struct {
+	UserID int32  `json:"user_id"`
+	Type   string `json:"type"`
+	jwt.RegisteredClaims
+}
+
+func NewJWTMiddleware(cfg *config.Config) *JWTMiddleware {
+	jwtCfg := cfg.JWTConfig
+
+	return &JWTMiddleware{cfg: &jwtCfg}
+}
+
+func GetClaims(ctx context.Context) (*Claims, bool) {
+	claims, ok := ctx.Value(UserContextKey).(*Claims)
+	return claims, ok
+}
+
+// ParseToken 解析accessToken
+func (m *JWTMiddleware) ParseToken(tokenStr string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(
+		tokenStr,
+		&Claims{},
+		func(token *jwt.Token) (interface{}, error) {
+			return []byte(m.cfg.Secret), nil
+		},
+	)
+
+	if err != nil || !token.Valid {
+		return nil, errs.ErrInvalidToken
+	}
+
+	claims, ok := token.Claims.(*Claims)
+	if !ok {
+		return nil, errs.ErrInvalidTokenClaims
+	}
+
+	if claims.UserID == 0 {
+		return nil, errs.ErrInvalidTokenClaims
+	}
+
+	return claims, nil
+}
+
+// ParseRefreshToken 解析RefreshToken
+func (m *JWTMiddleware) ParseRefreshToken(tokenStr string) (*RefreshClaims, error) {
+	token, err := jwt.ParseWithClaims(
+		tokenStr,
+		&RefreshClaims{},
+		func(token *jwt.Token) (interface{}, error) {
+			return []byte(m.cfg.Secret), nil
+		},
+	)
+
+	if err != nil {
+		// Token 已过期
+		if errors.Is(err, jwt.ErrTokenExpired) {
+			return nil, errs.ErrExpiredRefreshToken
+		}
+
+		// 签名错误、格式错误、非法 Token
+		return nil, errs.ErrInvalidRefreshToken
+	}
+
+	if !token.Valid {
+		return nil, errs.ErrInvalidRefreshToken
+	}
+
+	claims, ok := token.Claims.(*RefreshClaims)
+	if !ok {
+		return nil, errs.ErrInvalidRefreshToken
+	}
+
+	if claims.UserID == 0 {
+		return nil, errs.ErrInvalidRefreshToken
+	}
+
+	if claims.Type != RefreshTokenType {
+		return nil, errs.ErrInvalidRefreshToken
+	}
+
+	return claims, nil
+}
+
+func (m *JWTMiddleware) Middleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		auth := r.Header.Get("Authorization")
+
+		if auth == "" {
+			httputil.Fail(w, errs.ErrUnauthenticated)
+			return
+		}
+
+		parts := strings.SplitN(auth, " ", 2)
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			httputil.Fail(w, errs.ErrUnauthenticated)
+			return
+		}
+
+		tokenStr := parts[1]
+
+		claims, err := m.ParseToken(tokenStr)
+		if err != nil {
+			httputil.Fail(w, errs.ErrInvalidToken)
+			return
+		}
+
+		ctx := context.WithValue(r.Context(), UserContextKey, claims)
+
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func (m *JWTMiddleware) GenerateAccessToken(userID int32) (string, time.Time, error) {
+	now := time.Now()
+	expiresAt := now.Add(m.cfg.Expire)
+
+	accessClaims := Claims{
+		UserID: userID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expiresAt),
+			IssuedAt:  jwt.NewNumericDate(now),
+		},
+	}
+
+	accessToken := jwt.NewWithClaims(jwt.SigningMethodHS256, accessClaims)
+	token, err := accessToken.SignedString([]byte(m.cfg.Secret))
+	if err != nil {
+		return "", time.Time{}, err
+	}
+
+	return token, expiresAt, nil
+}
+
+func (m *JWTMiddleware) GenerateRefreshToken(userID int32) (string, time.Time, error) {
+	now := time.Now()
+	expiresAt := now.Add(m.cfg.RefreshExpire)
+
+	refreshClaims := RefreshClaims{
+		UserID: userID,
+		Type:   RefreshTokenType,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expiresAt),
+			IssuedAt:  jwt.NewNumericDate(now),
+		},
+	}
+
+	refreshToken := jwt.NewWithClaims(jwt.SigningMethodHS256, refreshClaims)
+	token, err := refreshToken.SignedString([]byte(m.cfg.Secret))
+	if err != nil {
+		return "", time.Time{}, err
+	}
+
+	return token, expiresAt, nil
+}