Node.js tls.DEFAULT_MAX_VERSION 方法

tls.DEFAULT_MAX_VERSION是 tls 模块中 TLS 类的内置应用程序编程接口，用于返回 tls.createSecureContext() 的 maxVersion 选项的默认值。

句法：

const tls.DEFAULT_MAX_VERSION

参数：此方法不接受任何参数。

返回值：此方法返回 tls.createSecureContext() 的 maxVersion 选项的默认值。

如何生成私钥和公钥证书？

私钥：打开记事本并复制粘贴以下密钥：

现在将文件保存为private-key.pem

公共证书：打开记事本并复制粘贴以下密钥：

现在将文件保存为public-cert.pem

示例 1：文件名：index.js

// Node.js program to demonstrate the
// tls.DEFAULT_MAX_VERSION method
  
var tls = require('tls'),
    fs = require('fs'),
  
    // Port and host address for server    
    PORT = 1337,
    HOST = '127.0.0.1',
    value = null;
  
// Private key and public certificate
// for access
var options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
  
// Creating and initializing server
var server = tls.createServer(options,
    function (socket) {
  
        // Print the data that we received
        socket.on('data', function (data) {
            console.log('\nReceived: %s ',
                data.toString().replace(/(\n)/gm, ""));
        });
  
        // Stopping the server
        // by using the close() method
        server.close(() => {
            console.log("Server closed successfully");
        });
    });
  
// Start listening on a specific port and
// address by using listen() method
server.listen(PORT, HOST, function () {
    console.log("I'm listening at %s, on "
        + "port %s", HOST, PORT);
});
  
// Creating and initializing client
var client = tls.connect(PORT, HOST,
    options, function () {
  
        // Getting max version by using
        // tls.DEFAULT_MAX_VERSION method
        value = tls.DEFAULT_MAX_VERSION;
  
        client.write(" max version : " + value);
  
        client.end(() => {
            console.log("Client closed successfully");
        });
    });

使用以下命令运行 index.js 文件：

node index.js

输出：

I'm listening at 127.0.0.1, on port 1337
Client closed successfully

Received:  max version : TLSv1.3
Server closed successfully

示例 2：文件名：index.js

// Node.js program to demonstrate the
// tls.DEFAULT_MAX_VERSION method
  
var tls = require('tls'),
    fs = require('fs'),
  
    // Port and host address for server    
    PORT = 1337,
    HOST = '127.0.0.1';
  
// Private key and public certificate
// for access
var options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
  
// Creating and initializing server
var server = tls.createServer(options,
    function (socket) {
  
        // Getting max version by using
        // tls.DEFAULT_MAX_VERSION method
        value = tls.DEFAULT_MAX_VERSION;
  
        socket.write(" max version : " + value);
  
        // Stopping the server
        // by using the close() method
        server.close(() => {
            console.log("Server closed successfully")
        });
    });
  
// Start listening on a specific port and address
// by using listen() method
server.listen(PORT, HOST, function () {
    console.log(
        "I'm listening at %s, on port %s",
        HOST, PORT);
});
  
// Creating and initializing client
var client = tls.connect(PORT, HOST,
    options, function () {
        console.log("client is connected");
    });
  
client.on("data", function (data) {
  
    console.log('Received: %s',
        data.toString().replace(/(\n)/gm, ""));
  
    // Close the connection after 
    // receiving the message
    client.end(() => {
        console.log("client closed successfully")
    });
});

使用以下命令运行 index.js 文件：

node index.js

输出：

I'm listening at 127.0.0.1, on port 1337
client is connected
Received:  max version : TLSv1.3
client closed successfully
Server closed successfully

参考： https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_tls_default_max_version