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internal/webhandlers/auth_handler.go

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+// Filename: internal/webhandlers/auth_handler.go (最终现代化改造版)
+package webhandlers
+
+import (
+	"gemini-balancer/internal/middleware"
+	"gemini-balancer/internal/service" // [核心改造] 依赖service层
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// WebAuthHandler [核心改造] 依赖关系净化，注入SecurityService
+type WebAuthHandler struct {
+	securityService *service.SecurityService
+}
+
+// NewWebAuthHandler [核心改造] 构造函数更新
+func NewWebAuthHandler(securityService *service.SecurityService) *WebAuthHandler {
+	return &WebAuthHandler{
+		securityService: securityService,
+	}
+}
+
+// ShowLoginPage 保持不变
+func (h *WebAuthHandler) ShowLoginPage(c *gin.Context) {
+	errMsg := c.Query("error")
+	from := c.Query("from") // 可以从登录失败的页面返回
+	c.HTML(http.StatusOK, "auth.html", gin.H{
+		"error": errMsg,
+		"from":  from,
+	})
+}
+
+// HandleLogin [核心改造] 认证逻辑完全委托给SecurityService
+func (h *WebAuthHandler) HandleLogin(c *gin.Context) {
+	c.Redirect(http.StatusFound, "/login?error=DEPRECATED_LOGIN_METHOD")
+}
+
+// HandleLogout 保持不变
+func (h *WebAuthHandler) HandleLogout(c *gin.Context) {
+	middleware.ClearAdminSessionCookie(c)
+	c.Redirect(http.StatusFound, "/login")
+}