Node.js server.addContext() 方法

server.addContext()是 tls 模块中 Socket 类的内置应用程序编程接口，用于添加安全上下文以供客户端使用。

句法：

server.addContext(hostname, context)

参数：此方法将以下参数作为参数：

主机名：表示主机名的服务器名称。
context：来自 tls.createSecureContext() 选项参数的任何属性。

返回值：此方法不返回任何值。

如何生成私钥和公共证书？

私钥：打开记事本并复制粘贴以下密钥：

将文件另存为private-key.pem

公共证书：打开记事本并复制粘贴以下密钥：

将文件另存为public-cert.pem

示例 1：文件名：index.js

// Node.js program to demonstrate the
// server.setBroadcast() 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) {
  
    // Print the data that we received
    socket.on("data", function (data) {
        console.log('\nReceived: %s ',
            data.toString().replace(/(\n)/gm, ""));
    });
  
});
  
// Adding context into the server
server.addContext('127.0.0.2', options.key);
console.log("context is added");
  
// Start listening on a specific 
// port and address
server.listen(PORT, HOST, function () {
    console.log("I'm listening at %s, "
        + "on port %s", HOST, PORT);
});
  
// When an error occurs, show it.
server.on("error", function (error) {
  
    console.error(error);
    // Close the connection after the
    // error occurred.
    // server.destroy();
});
  
server.on("end", () => {
    server.end();
    //server.destroy();
})
  
  
// Creating and initializing client
var client = tls.connect(PORT, HOST, 
            options, function () {
  
    // Check if the authorization worked
    if (client.authorized) {
        console.log("Connection authorized"
        + " by a Certificate Authority.");
    } else {
        console.log("Connection not authorized: "
                + client.authorizationError)
    }
  
    // Send a friendly message
    client.write(
        "I am the client sending you a message.");
    client.end();
});
  
client.on("close", function () {
    console.log("Connection closed");
});
  
// When an error occurs, show it.
client.on("error", function (error) {
  
    console.error(error);
  
    // Close the connection after
    // the error occurred.
    client.destroy();
});

输出：

context is added
I'm listening at 127.0.0.1, on port 1337
Connection not authorized: DEPTH_ZERO_SELF_SIGNED_CERT

Received: I am the client sending you a message.
Connection closed

示例 2：文件名：index.js

// Node.js program to demonstrate the
// server.addcontext() 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) {
  
    // Print the data that we received
    socket.on('data', function (data) {
        console.log('\nReceived: %s ',
            data.toString()
                .replace(/(\n)/gm, ""));
    });
});
  
// Adding context into the server
// by using addContext() method
server.addContext('127.0.0.2', options.key);
console.log("context is added");
  
// Start listening on a specific
// port and address
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 () {
  
    // Send a friendly message
    client.write("I am the client "
        + "sending you a message.");
    client.end();
});

使用以下命令运行 index.js 文件：

node index.js

输出：

context is added
I'm listening at 127.0.0.1, on port 1337

Received: I am the client sending you a message.

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