Node.js server.addContext() Method
Last Updated :
06 Apr, 2023
The server.addContext() is an inbuilt application programming interface of class Socket within tls module which is used to add the security context for the use of the client.
Syntax:
server.addContext(hostname, context)
Parameters: This method takes the following argument as a parameter:
- hostname: A server name indicating hostname.
- context: Any of the properties from the tls.createSecureContext() options arguments.
Return Value: This method does not return any value.
How to generate private keys and public certificates?
Private key: Open Notepad and copy and paste the following key:
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
Save the file as a private key.pem
Public certificate: Open Notepad and copy and paste the following key:
-----BEGIN CERTIFICATE-----
MIICfzCCAegCCQDxxeXw914Y2DANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMC
SU4xEzARBgNVBAgMCldlc3RiZW5nYWwxEDAOBgNVBAcMB0tvbGthdGExFDASBgNV
BAoMC1BhbmNvLCBJbmMuMRUwEwYDVQQDDAxSb2hpdCBQcmFzYWQxIDAeBgkqhkiG
9w0BCQEWEXJvZm9mb2ZAZ21haWwuY29tMB4XDTIwMDkwOTA1NTExN1oXDTIwMTAw
OTA1NTExN1owgYMxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApXZXN0YmVuZ2FsMRAw
DgYDVQQHDAdLb2xrYXRhMRQwEgYDVQQKDAtQYW5jbywgSW5jLjEVMBMGA1UEAwwM
Um9oaXQgUHJhc2FkMSAwHgYJKoZIhvcNAQkBFhFyb2ZvZm9mQGdtYWlsLmNvbTCB
nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAt/EfcF3FG4TneOBWr4JhOUdyuCXm
Dhy5yO3VKtQfPxr+5d0joCSnn/5vYDNSr1MfedZmqVxrXFoMAdPCd71BNmDmeLVi
QK61WREtASP0ZhQMoUBT+R3Fpdy0jPS0YoT/fBd96CJCmgsQOS8Tq5IKVeB61MyC
kwAQ2Goe0T3sdVkCAwEAATANBgkqhkiG9w0BAQsFAAOBgQATe6ixdAjoV7BSHgRX
bXM2+IZLq8kq3s7ck0EZrRVhsivutcaZwDXRCCinB+OlPedbzXwNZGvVX0nwPYHG
BfiXwdiuZeVJ88ni6Fm6RhoPtu2QF1UExfBvSXuMBgR+evp+e3QadNpGx6Ppl1aC
hWF6W2H9+MAlU7yvtmCQQuZmfQ==
-----END CERTIFICATE-----
Save the file as public-cert.pem
Example 1: Filename: index.js
javascript
const tls = require( 'tls' ),
fs = require( 'fs' ),
PORT = 1337,
HOST = '127.0.0.1' ;
const options = {
key: fs.readFileSync( 'private-key.pem' ),
cert: fs.readFileSync( 'public-cert.pem' ),
rejectUnauthorized: false
};
const server = tls.createServer(options,
function (socket) {
socket.on( "data" , function (data) {
console.log( '\nReceived: %s ' ,
data.toString().replace(/(\n)/gm, "" ));
});
});
server.addContext( '127.0.0.2' , options.key);
console.log( "context is added" );
server.listen(PORT, HOST, function () {
console.log( "I'm listening at %s, "
+ "on port %s" , HOST, PORT);
});
server.on( "error" , function (error) {
console.error(error);
});
server.on( "end" , () => {
server.end();
})
const client = tls.connect(PORT, HOST,
options, function () {
if (client.authorized) {
console.log( "Connection authorized"
+ " by a Certificate Authority." );
} else {
console.log( "Connection not authorized: "
+ client.authorizationError)
}
client.write(
"I am the client sending you a message." );
client.end();
});
client.on( "close" , function () {
console.log( "Connection closed" );
});
client.on( "error" , function (error) {
console.error(error);
client.destroy();
});
|
Output:
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
Example 2: Filename: index.js
javascript
const tls = require( 'tls' ),
fs = require( 'fs' ),
PORT = 1337,
HOST = '127.0.0.1' ;
const options = {
key: fs.readFileSync( 'private-key.pem' ),
cert: fs.readFileSync( 'public-cert.pem' ),
rejectUnauthorized: false
};
const server = tls.createServer(options,
function (socket) {
socket.on( 'data' , function (data) {
console.log( '\nReceived: %s ' ,
data.toString()
.replace(/(\n)/gm, "" ));
});
});
server.addContext( '127.0.0.2' , options.key);
console.log( "context is added" );
server.listen(PORT, HOST, function () {
console.log( "I'm listening at %s, "
+ "on port %s" , HOST, PORT);
});
const client = tls.connect(PORT,
HOST, options, function () {
client.write( "I am the client "
+ "sending you a message." );
client.end();
});
|
Run the index.js file using the following command:
node index.js
Output:
context is added
I'm listening at 127.0.0.1, on port 1337
Received: I am the client sending you a message.
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_server_addcontext_hostname_context
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