import ballerina/io;
import ballerina/websocket;

// Defines the WebSocket client to call the OAuth2 secured APIs.
// The client is enriched with the `Authorization: Bearer <token>` header by
// passing the [`websocket:OAuth2ClientCredentialsGrantConfig`](https://docs.central.ballerina.io/ballerina/websocket/latest/records/OAuth2ClientCredentialsGrantConfig) for the `auth` configuration
// of the client.
websocket:Client securedEP = check new("wss://localhost:9090/foo/bar",
    auth = {
        tokenUrl: "https://localhost:9445/oauth2/token",
        clientId: "FlfJYKBD2c925h4lkycqNZlC2l4a",
        clientSecret: "PJz0UhTJMrHOo68QQNpvnqAY_3Aa",
        scopes: ["admin"],
        clientConfig: {
            secureSocket: {
                cert: "../resource/path/to/public.crt"
            }
        }
    },
    secureSocket = {
        cert: "../resource/path/to/public.crt"
    }
);

public function main() returns error? {
    check securedEP->writeMessage("Hello, World!");
    string textMessage = check securedEP->readMessage();
    io:println(textMessage);
}

Client - OAuth2 Client Credentials grant type

A client, which is secured with OAuth2 client credentials grant type can be used to connect to a secured service.
The client is enriched with the Authorization: Bearer <token> header by passing the websocket:OAuth2ClientCredentialsGrantConfig for the auth configuration of the client.

For more information on the underlying module, see the OAuth2 module.

import ballerina/io;
import ballerina/websocket;
websocket:Client securedEP = check new("wss://localhost:9090/foo/bar",
    auth = {
        tokenUrl: "https://localhost:9445/oauth2/token",
        clientId: "FlfJYKBD2c925h4lkycqNZlC2l4a",
        clientSecret: "PJz0UhTJMrHOo68QQNpvnqAY_3Aa",
        scopes: ["admin"],
        clientConfig: {
            secureSocket: {
                cert: "../resource/path/to/public.crt"
            }
        }
    },
    secureSocket = {
        cert: "../resource/path/to/public.crt"
    }
);

Defines the WebSocket client to call the OAuth2 secured APIs. The client is enriched with the Authorization: Bearer <token> header by passing the websocket:OAuth2ClientCredentialsGrantConfig for the auth configuration of the client.

public function main() returns error? {
    check securedEP->writeMessage("Hello, World!");
    string textMessage = check securedEP->readMessage();
    io:println(textMessage);
}
# As a prerequisite, start a sample service secured with OAuth2.
# You may need to change the trusted certificate file path.
bal run websocket_client_oauth2_client_credentials_grant_type.bal
Hello, World!