feat(login): Captcha upgrade and add the function to ban IP addresses (#250)

http/middleware/limiter.go

@@ -0,0 +1,22 @@
+package middleware
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/lejianwen/rustdesk-api/v2/global"
+	"github.com/lejianwen/rustdesk-api/v2/http/response"
+	"net/http"
+)
+
+func Limiter() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		loginLimiter := global.LoginLimiter
+		clientIp := c.ClientIP()
+		banned, _ := loginLimiter.CheckSecurityStatus(clientIp)
+		if banned {
+			response.Fail(c, http.StatusLocked, response.TranslateMsg(c, "Banned"))
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}