Node.js

Automatically Refresh Token for 401 Unauthorized

See more Google Calendar Examples

Demonstrates how to automatically refresh an access token (without user interaction) when the token expires and a 401 Unauthorized response is received. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var tokenFilePath = "qa_data/tokens/googleCalendar.json";

    // Get our current access token.
    var jsonToken = new chilkat.JsonObject();
    success = jsonToken.LoadFile(tokenFilePath);
    if (jsonToken.HasMember("access_token") == false) {
        console.log("No access token found.");
        return;
    }

    var http = new chilkat.Http();
    http.AuthToken = jsonToken.StringOf("access_token");

    var jsonResponse = http.QuickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList");
    if (http.LastMethodSuccess !== true) {

        if (http.LastStatus !== 401) {
            console.log(http.LastErrorText);
            console.log("----");
            console.log(http.LastResponseBody);
            return;
        }

        // The access token must've expired. 
        // Refresh the access token and then retry the request.
        var oauth2 = new chilkat.OAuth2();

        oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token";

        // Replace these with actual values.
        oauth2.ClientId = "GOOGLE-CLIENT-ID";
        oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET";

        // Get the "refresh_token"
        oauth2.RefreshToken = jsonToken.StringOf("refresh_token");

        // Send the HTTP POST to refresh the access token..
        success = oauth2.RefreshAccessToken();
        if (success !== true) {
            console.log(oauth2.LastErrorText);
            return;
        }

        // The response contains a new access token, but we must keep
        // our existing refresh token for when we need to refresh again in the future.
        jsonToken.UpdateString("access_token",oauth2.AccessToken);

        // Save the new JSON access token response to a file.
        var sbJson = new chilkat.StringBuilder();
        jsonToken.EmitCompact = false;
        jsonToken.EmitSb(sbJson);
        sbJson.WriteFile(tokenFilePath,"utf-8",false);

        console.log("OAuth2 authorization granted!");
        console.log("New Access Token = " + oauth2.AccessToken);

        // re-try the original request.
        http.AuthToken = oauth2.AccessToken;
        jsonResponse = http.QuickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList");
        if (http.LastMethodSuccess !== true) {
            console.log(http.LastErrorText);
            return;
        }

    }

    console.log(jsonResponse);
    console.log("-----------------------------");

}

chilkatExample();