查看“Nginx+lua+redis实现post请求接口黑名单”的源代码

==== 概述 ====
需求：所有访问/webapi/**的请求必须是POST请求，而且根据请求参数过滤不符合规则的非法请求(黑名单), 这些请求一律不转发到后端服务器(Tomcat)
实现思路：通过在Nginx上进行访问限制，通过Lua来灵活实现业务需求，而Redis用于存储黑名单列表。

==== 具体实现 ====
1.lua代码

本例中限制规则包括(post请求，ip地址黑名单，请求参数中imsi,tel值和黑名单)

 cat /usr/local/nginx/conf/lua/ipblacklist.lua
 ngx.req.read_body()
 
 local redis = require "resty.redis"
 local red = redis.new()
 red.connect(red, '127.0.0.1', '6379')
 
 local myIP = ngx.req.get_headers()["X-Real-IP"]
 if myIP == nil then
   myIP = ngx.req.get_headers()["x_forwarded_for"]
 end
 if myIP == nil then
   myIP = ngx.var.remote_addr
 end
 
 if ngx.re.match(ngx.var.uri,"^(/webapi/).*$") then
    local method = ngx.var.request_method
    if method == 'POST' then
        local args = ngx.req.get_post_args()
 
        local hasIP = red:sismember('black.ip',myIP)
        local hasIMSI = red:sismember('black.imsi',args.imsi)
        local hasTEL = red:sismember('black.tel',args.tel)
        if hasIP==1 or hasIMSI==1 or hasTEL==1 then
            --ngx.say("This is 'Black List' request")
            ngx.exit(ngx.HTTP_FORBIDDEN)
          end
        else
            --ngx.say("This is 'POST' request")
            ngx.exit(ngx.HTTP_FORBIDDEN)
          end
         end

2.nginx.conf

 location / {
 root html;
 index index.html index.htm;
 
 access_by_lua_file /usr/local/nginx/conf/lua/ipblacklist.lua;
 
 proxy_pass http://127.0.0.1:8080;
 client_max_body_size 1m;
 }
3.添加黑名单规则数据

 #redis-cli sadd black.ip '153.34.118.50'
 #redis-cli sadd black.imsi '460123456789' 
 #redis-cli sadd black.tel '15888888888'
可以通过redis-cli smembers black.imsi 查看列表明细

4.验证结果

 <nowiki>curl -d "imsi=460123456789&tel=15800000000" "http://www.kjios.com/myapi/111"
 <html>
 <head><title>404 Not Found</title></head>
 <body bgcolor="white">
 <center><h1>404 Not Found</h1></center>
 <hr><center>nginx</center>
 </body>
 </html></nowiki>