C++

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. C++

#include <CkJsonObject.h>
#include <CkHttp.h>
#include <CkOAuth2.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    const char *tokenFilePath = "qa_data/tokens/googleCalendar.json";

    // Get our current access token.
    CkJsonObject jsonToken;
    success = jsonToken.LoadFile(tokenFilePath);
    if (jsonToken.HasMember("access_token") == false) {
        std::cout << "No access token found." << "\r\n";
        return;
    }

    CkHttp http;
    http.put_AuthToken(jsonToken.stringOf("access_token"));

    const char *jsonResponse = http.quickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList");
    if (http.get_LastMethodSuccess() != true) {

        if (http.get_LastStatus() != 401) {
            std::cout << http.lastErrorText() << "\r\n";
            std::cout << "----" << "\r\n";
            std::cout << http.lastResponseBody() << "\r\n";
            return;
        }

        // The access token must've expired. 
        // Refresh the access token and then retry the request.
        CkOAuth2 oauth2;

        oauth2.put_TokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

        // Replace these with actual values.
        oauth2.put_ClientId("GOOGLE-CLIENT-ID");
        oauth2.put_ClientSecret("GOOGLE-CLIENT-SECRET");

        // Get the "refresh_token"
        oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"));

        // Send the HTTP POST to refresh the access token..
        success = oauth2.RefreshAccessToken();
        if (success != true) {
            std::cout << oauth2.lastErrorText() << "\r\n";
            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.
        CkStringBuilder sbJson;
        jsonToken.put_EmitCompact(false);
        jsonToken.EmitSb(sbJson);
        sbJson.WriteFile(tokenFilePath,"utf-8",false);

        std::cout << "OAuth2 authorization granted!" << "\r\n";
        std::cout << "New Access Token = " << oauth2.accessToken() << "\r\n";

        // re-try the original request.
        http.put_AuthToken(oauth2.accessToken());
        jsonResponse = http.quickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList");
        if (http.get_LastMethodSuccess() != true) {
            std::cout << http.lastErrorText() << "\r\n";
            return;
        }

    }

    std::cout << jsonResponse << "\r\n";
    std::cout << "-----------------------------" << "\r\n";
    }