feat(login):基本完成用户登录，待测。

router/security.go

@@ -0,0 +1,23 @@
+package router
+
+import (
+	"electricity_bill_calc/cache"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func AuthenticatedSession(c *gin.Context) {
+	auth := c.Request.Header.Get("Authorization")
+	if len(auth) > 0 {
+		token := strings.Fields(auth)[1]
+		session, err := cache.RetreiveSession(token)
+
+		if err != nil {
+			c.AbortWithStatus(http.StatusForbidden)
+		}
+		c.Set("session", session)
+	}
+	c.Next()
+}