Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/middleware/auth.go

@@ -0,0 +1,95 @@
+package middleware
+
+import (
+	"fmt"
+	"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")
+		fmt.Printf("[DEBUG] Auth middleware: Authorization header = %q\n", authHeader)
+
+		if authHeader == "" {
+			fmt.Printf("[DEBUG] Auth middleware: no Authorization header, returning 401\n")
+			response.Unauthorized(c, "authorization header is required")
+			c.Abort()
+			return
+		}
+
+		// 提取Token
+		parts := strings.SplitN(authHeader, " ", 2)
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			fmt.Printf("[DEBUG] Auth middleware: invalid Authorization header format\n")
+			response.Unauthorized(c, "invalid authorization header format")
+			c.Abort()
+			return
+		}
+
+		token := parts[1]
+		fmt.Printf("[DEBUG] Auth middleware: token = %q\n", token[:min(20, len(token))]+"...")
+
+		// 验证Token
+		claims, err := jwtService.ParseToken(token)
+		if err != nil {
+			fmt.Printf("[DEBUG] Auth middleware: failed to parse token: %v\n", err)
+			response.Unauthorized(c, "invalid token")
+			c.Abort()
+			return
+		}
+
+		fmt.Printf("[DEBUG] Auth middleware: parsed claims, user_id = %q, username = %q\n", claims.UserID, claims.Username)
+
+		// 将用户信息存入上下文
+		c.Set("user_id", claims.UserID)
+		c.Set("username", claims.Username)
+
+		c.Next()
+	}
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+// 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
+		parts := strings.SplitN(authHeader, " ", 2)
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			c.Next()
+			return
+		}
+
+		token := parts[1]
+
+		// 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()
+	}
+}