nginx 官方镜像njs 使用

实际上nginx 官方docker 镜像已经包含了njs 模块了

参考使用

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• 环境准备
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version: "3"
services:
  api:
    image: nginx:1.20.2
    volumes:
    - "./nginx.conf:/etc/nginx/nginx.conf"
    - "./js:/opt/js"
    ports:
    - "80:80"

• • 
    
• nginx 配置
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user root;  
load_module modules/ngx_http_js_module.so;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  text/html;
    gzip  on;
    real_ip_header     X-Forwarded-For;
    js_import /opt/js/http.js;
    js_set $foo     http.foo;
    resolver 114.114.114.114;
    js_set $summary http.summary;
    js_set $hash    http.hash;
    server {
       listen 80;
       charset utf-8;
       default_type text/html;
       location / {
            add_header X-Foo $foo;
            js_content http.baz;
        }

 location = /summary {
            return 200 $summary;
        }

  location = /hello {
            js_content http.hello;
        }

  # since 0.7.0
        location = /fetch {
            js_content                   http.fetch;
        }

        # since 0.7.0
        location = /crypto {
            add_header Hash $hash;
            return     200;
        }
     }
}

• js 模块

function foo(r) {
    r.log("hello from foo() handler");
    return "foo";
}

function summary(r) {
    var a, s, h;

 s = "JS summary\n\n";

   s += "Method: " + r.method + "\n";
    s += "HTTP version: " + r.httpVersion + "\n";
    s += "Host: " + r.headersIn.host + "\n";
    s += "Remote Address: " + r.remoteAddress + "\n";
    s += "URI: " + r.uri + "\n";

 s += "Headers:\n";
    for (h in r.headersIn) {
        s += "  header '" + h + "' is '" + r.headersIn[h] + "'\n";
    }

   s += "Args:\n";
    for (a in r.args) {
        s += "  arg '" + a + "' is '" + r.args[a] + "'\n";
    }

  return s;
}

function baz(r) {
    r.status = 200;
    r.headersOut.foo = 1234;
    r.headersOut['Content-Type'] = "text/plain; charset=utf-8";
    r.headersOut['Content-Length'] = 15;
    r.sendHeader();
    r.send("nginx");
    r.send("java");
    r.send("script");

   r.finish();
}

function hello(r) {
    r.return(200, "Hello world!");
}

// since 0.7.0
async function fetch(r) {
    let result = await (
        await ngx.fetch('http://nginx.org/en/docs/http/ngx_http_js_module.html')
        ).text();
    r.return(200, JSON.stringify(result, undefined, 4));
}

// since 0.7.0
async function hash(r) {
    let hash = await crypto.subtle.digest('SHA-512', r.headersIn.host);
    r.setReturnValue(Buffer.from(hash).toString('hex'));
}

export default {foo, summary, baz, hello, fetch, hash};

• 效果
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fetch

说明

目前来说如果直接使用了官方的nginx 同时需要脚本灵活的能力，njs 模块是一个很不错的选择，而且目前来说已经越来越强大了，当前npm 模块的支持

目前不是很强大，但是可以基于其他模式改进，可以参考以下链接