Initial commit: Gitea Project Management System

Features:
- Complete project management system with Epic/Story/Task hierarchy
- Vue.js 3 + Element Plus frontend with kanban board
- Go backend with Gin framework and GORM
- OAuth2 integration with Gitea
- Docker containerization with MySQL
- RESTful API for project, task, and user management
- JWT authentication and authorization
- Responsive web interface with dashboard

internal/middleware/auth.go

@@ -0,0 +1,93 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"giteapm/config"
+	"giteapm/internal/models"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserID   uint   `json:"user_id"`
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		tokenString := c.GetHeader("Authorization")
+		if tokenString == "" {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "缺少授权令牌"})
+			c.Abort()
+			return
+		}
+
+		if strings.HasPrefix(tokenString, "Bearer ") {
+			tokenString = tokenString[7:]
+		}
+
+		token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+			return []byte(cfg.JWT.Secret), nil
+		})
+
+		if err != nil || !token.Valid {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "无效的授权令牌"})
+			c.Abort()
+			return
+		}
+
+		claims, ok := token.Claims.(*Claims)
+		if !ok {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "无效的令牌格式"})
+			c.Abort()
+			return
+		}
+
+		user, err := models.GetUserByID(claims.UserID)
+		if err != nil {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "用户不存在"})
+			c.Abort()
+			return
+		}
+
+		c.Set("user", user)
+		c.Set("user_id", claims.UserID)
+		c.Set("username", claims.Username)
+		c.Set("role", claims.Role)
+		c.Next()
+	}
+}
+
+func RequireRole(roles ...string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		userRole, exists := c.Get("role")
+		if !exists {
+			c.JSON(http.StatusForbidden, gin.H{"error": "无法获取用户角色"})
+			c.Abort()
+			return
+		}
+
+		for _, role := range roles {
+			if userRole == role {
+				c.Next()
+				return
+			}
+		}
+
+		c.JSON(http.StatusForbidden, gin.H{"error": "权限不足"})
+		c.Abort()
+	}
+}
+
+func GetCurrentUser(c *gin.Context) (*models.User, error) {
+	user, exists := c.Get("user")
+	if !exists {
+		return nil, jwt.ErrTokenMalformed
+	}
+	return user.(*models.User), nil
+}