机架攻击:IP 地址数组 [英] Rack-Attack: Array of IP addresses

问题描述

我正在尝试创建一组 IP 地址，以便在应用程序运行时 Rack-Attack 可以从允许访问应用程序的 IP 地址集中进行识别.所以我所做的如下:

I'm trying to create an array of IP addresses so that when the application is ran Rack-Attack can identify from the set of IP addresses that are allowed to access the application. So what I have done is as followed:

  a = "127.0.0.1"
  Rack::Attack.blacklist('allow from localhost') do |req|
    p "#{'127.0.0.1' == req.ip} "
   a != req.ip 
  end

以上有效，因此本地主机可以访问该应用程序，但我尝试了以下似乎不起作用的以下方法:

The above works, so localhost can access the application but I have tried the following below which seems to not work what so ever:

a = "127.0.0.1", "1.2.3.4"
  Rack::Attack.blacklist('allow from localhost') do |req|
    a.select{|x| x != req.ip}.join("")
  end

有人可以解释一下这样做的正确方法是什么.你可以看到我创建了一个数组.我想让 Rack::Attack 检测数组中的 IP 地址是否可以访问.

Can someone explain what the correct way would be to do this. You can see that I create an array. I want Rack::Attack to detect whether the IP address in the array has access or not.

推荐答案

一种有效的方法是使用 Set，一个类似于数组的容器，但提供对单个、唯一元素的快速查找.

An efficient way to do this would be to use a Set, a container that's like an array but provides fast lookup on individual, unique elements.

因此，请记住这一点:

allowed = %w[ 127.0.0.1 1.2.3.4 ].to_set

Rack::Attack.blacklist('allow from localhost') do |req|
  !allowed.include?(req.ip)
end

在您的原始声明中:

a = "x", "y"

在这种情况下，a 被分配给列表中的第一件事，"x"，其余的被忽略.

In this case a is assigned to the first thing in that list, "x", and the rest is ignored.

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