添加 OIDC 和 OAuth2 服务器的基础结构，包括配置、数据库模型、服务、处理器和路由。新增登录页面模板，支持用户认证和授权流程。

middleware/auth.go

@@ -0,0 +1,59 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v4"
+)
+
+func BearerAuth(jwtSecret []byte) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "missing authorization header"})
+			c.Abort()
+			return
+		}
+
+		// 检查 Bearer 前缀
+		parts := strings.Split(authHeader, " ")
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "invalid authorization header"})
+			c.Abort()
+			return
+		}
+
+		tokenString := parts[1]
+
+		// 解析和验证令牌
+		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+			// 验证签名算法
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, jwt.ErrSignatureInvalid
+			}
+			return jwtSecret, nil
+		})
+
+		if err != nil {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
+			c.Abort()
+			return
+		}
+
+		if !token.Valid {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
+			c.Abort()
+			return
+		}
+
+		// 将令牌中的声明存储在上下文中
+		if claims, ok := token.Claims.(jwt.MapClaims); ok {
+			c.Set("user_id", uint(claims["sub"].(float64)))
+			c.Set("scope", claims["scope"].(string))
+		}
+
+		c.Next()
+	}
+}