backend/internal/middleware/auth.go

package middleware

import (
	"strings"

	"github.com/gin-gonic/gin"

	"carrot_bbs/internal/pkg/response"
	"carrot_bbs/internal/service"
)

// Auth 认证中间件
func Auth(jwtService *service.JWTService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")

		if authHeader == "" {
			response.Unauthorized(c, "authorization header is required")
			c.Abort()
			return
		}

		// 提取Token
		prefix, token, found := strings.Cut(authHeader, " ")
		if !found || prefix != "Bearer" {
			response.Unauthorized(c, "invalid authorization header format")
			c.Abort()
			return
		}

		// 验证Token
		claims, err := jwtService.ParseToken(token)
		if err != nil {
			response.Unauthorized(c, "invalid token")
			c.Abort()
			return
		}

		// 将用户信息存入上下文
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)

		c.Next()
	}
}

// OptionalAuth 可选认证中间件
func OptionalAuth(jwtService *service.JWTService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.Next()
			return
		}

		// 提取Token
		prefix, token, found := strings.Cut(authHeader, " ")
		if !found || prefix != "Bearer" {
			c.Next()
			return
		}

		// 验证Token
		claims, err := jwtService.ParseToken(token)
		if err != nil {
			c.Next()
			return
		}

		// 将用户信息存入上下文
		c.Set("user_id", claims.UserID)
		c.Set("username", claims.Username)

		c.Next()
	}
}