C++

Get XOAUTH2 Access Token from Google OAuth 2.0 Authorization Server

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Obtains an OAUTH2 access token from the Google OAuth 2.0 Authorization Server. This is for Server to server applications using Google API's that need an access token. See https://developers.google.com/accounts/docs/OAuth2ServiceAccount C++

#include <CkHttp.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkHttp http;

    //  --------------------------------------------------------------------------------
    //  For a step-by-step guide for setting up your Google Workspace service account,
    //  see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
    //  --------------------------------------------------------------------------------
    //  Begin by loading your Google service account key (.p12)
    CkCert cert;
    success = cert.LoadPfxFile("c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12","notasecret");
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    //  The ISS is your service account email address ending in gserviceaccount.com.
    const char *iss = "chilkatsvc@chilkat25.iam.gserviceaccount.com";

    //  The scope is always the following string:
    const char *scope = "https://mail.google.com/";

    //  The sub is your company email address
    const char *oauth_sub = "bob@yourcompany.com";

    //  The access token is valid for this number of seconds.
    int numSec = 3600;

    const char *accessToken = http.g_SvcOauthAccessToken(iss,scope,oauth_sub,numSec,cert);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }
    else {
        std::cout << "access token: " << accessToken << "\r\n";
    }

    //  The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one.
    }