Question

我的redis服务器中有一组IP地址被阻止。现在，当客户提出请求时，

请求必须由nginx拦截
检查remote_addr是否属于被阻止的IP
如果ip被阻止，则添加标头
然后使用request_uri重定向到实际的ip地址。

nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;

    keepalive_timeout  65;

    lua_shared_dict ip_status 1m;

    server {
        listen       9080;
        server_name  localhost;
        location ~ .* {
            rewrite_by_lua_file src/ip_check.lua;
        }
    }
}

的src / ip_check.lua

-- redis configuration
local redis_host                = "127.0.0.1"
local redis_port                = 6379  -- connection timeouts for redis in ms.
local redis_max_idle_timeout    = 10000
local redis_pool_size           = 2     --  don't set this too high!
local redis_timeout             = 200

-- check a set with this key for blacklist entries
local redis_key         = ngx.var.remote_addr
local ip_status         = ngx.shared.ip_status
local status_unblocked  = "0"
local status_blocked    = "1"
-- cache lookups for this many seconds
local cache_ttl         = 1800

local redirect_host             = "http://192.168.12.103:8080/Spring4MVCHelloWorld1"
local header_ip_status_key      = "Ip-Status"
-- value of the header to be sent when the client ip address is blocked
local header_ip_status_value    = "block"
local add_header                = status_unblocked

-- lookup the value in the cache
local cache_result = ip_status:get(redis_key)
if cache_result then
  if cache_result == status_blocked then
    add_header = status_blocked
  end
else
  -- lookup against redis
  local resty = require "resty.redis"
  local redis = resty:new()
  redis:set_timeout(redis_timeout)

  local connected, err = redis:connect(redis_host, redis_port)
  if not connected then
    ngx.log(ngx.ERR, "ip_check: could not connect to redis @"..redis_host..":"..redis_port.." - "..err)
  else
    ngx.log(ngx.ALERT, "ip_check: found connect to redis @"..redis_host..":"..redis_port.." - successful")

    local result, err = redis:get(redis_key)
    if not result then
      ngx.log(ngx.ERR, "ip_check: lookup failed for "..ngx.var.remote_addr.." - "..err)
    else
      if result == status_blocked then
        add_header = status_blocked
      end

      -- cache the result from redis
      ip_status:set(ip, add_header, cache_ttl)
    end

    redis:set_keepalive(redis_max_idle_timeout, redis_pool_size)
  end
end

ngx.log(ngx.ALERT, "ip_check: "..header_ip_status_key.." of "..ngx.var.remote_addr.." is "..add_header)
if add_header == status_blocked then
    ngx.header[header_ip_status_key] = header_ip_status_value
    ngx.req.set_header(header_ip_status_key, header_ip_status_value)
end

ngx.redirect(redirect_host..ngx.var.request_uri)

出于测试目的，我在值为1的redis中添加了127.0.0.1密钥。因此，重定向uri应该使用附加标头来命中。我面临的问题是无论我使用什么ngx.header或ngx.req.set_header， Ip-Status 标头都没有发送到重定向请求，而结束api也没有收到它

例如，如果我在浏览器中点击http://localhost:9080/hello，

请求标题

Host:"localhost:9080"
User-Agent:"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0"
Accept:"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
Accept-Language:"en-US,en;q=0.5"
Accept-Encoding:"gzip, deflate"
Connection:"keep-alive"

回复标题

Connection:"keep-alive"
Content-Length:"166"
Content-Type:"text/html"
Date:"Thu, 05 May 2016 08:06:33 GMT"
Location:"http://192.168.12.103:8080/Spring4MVCHelloWorld1/hello"
Server:"openresty/1.9.7.2"
ip-status:"block"

重定向的uri是http://localhost:9080/hello，

请求标题

Host:"192.168.12.103:8080"
User-Agent:"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0"
Accept:"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
Accept-Language:"en-US,en;q=0.5"
Accept-Encoding:"gzip, deflate"
Cookie:"JSESSIONID=4834843FE0E76170E429028E096A66E5"
Connection:"keep-alive"

回复标题

Content-Language:"en-US"
Content-Length:"166"
Content-Type:"text/html;charset=UTF-8"
Date:"Thu, 05 May 2016 08:06:33 GMT"
Server:"Apache-Coyote/1.1"

我能够在原始请求的响应标头中看到 Ip-Status 标头，但在重定向的uri的请求标头中却看不到。有关如何将标头发送到重定向的uri的任何帮助都将非常有用。

我是nginx和lua的新手。问，因为如果问题已经被问到，我无法找到任何相应的问题。

Answer 1

浏览器重定向到重定向的uri，而nginx无法控制标头。所以，我删除了

ngx.redirect(redirect_host..ngx.var.request_uri)

从src / ip_check.lua并更改了nginx.conf以进行代理调用，我能够观察到api能够接收到额外的标头。

修改后的nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;
    lua_shared_dict ip_status 1m;

    server {
        listen       9080;
        server_name  localhost;
        location ~ .* {
            set $backend_host   "http://192.168.12.103:8080/Spring4MVCHelloWorld1";
            access_by_lua_file src/ip_check.lua;
            proxy_pass $backend_host$request_uri;
        }
    }
}

此修改后的nginx.conf将向 $ backend_host $ request_uri 发出请求，浏览器将不知道所做的重定向。因此，在进行代理调用时，将发送由ngx.req.set_header设置的标头。所以，

ngx.header[header_ip_status_key] = header_ip_status_value

也可以从src / ip_check.lua中删除。

nginx lua在重写之前无法设置标头

1 个答案: