(Unicode C++) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account key.

Chilkat C/C++ Library Downloads
MS Visual C/C++ C++ Builder Linux C/C++ Alpine Linux C/C++	MacOS C/C++ iOS C/C++ Android C/C++ MinGW C/C++

#include <CkPfxW.h>
#include <CkAuthGoogleW.h>
#include <CkSocketW.h>

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

    // --------------------------------------------------------------------------------
    // 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
    // --------------------------------------------------------------------------------

    // First load the PKCS12 (.p12 / .pfx) into a PFX object.
    CkPfxW pfx;
    bool success = pfx.LoadPfxFile(L"qa_data/pfx/chilkat25-cbd7b42afbd8.p12",L"notasecret");
    if (success != true) {
        wprintf(L"%s\n",pfx.lastErrorText());
        return;
    }

    CkAuthGoogleW gAuth;
    success = gAuth.SetP12(pfx);

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

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

    // The sub is your company email address
    const wchar_t *oauth_sub = L"info@chilkat.xyz";

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

    gAuth.put_EmailAddress(iss);
    gAuth.put_Scope(scope);
    gAuth.put_ExpireNumSeconds(numSec);
    gAuth.put_SubEmailAddress(oauth_sub);

    // Connect to www.googleapis.com
    CkSocketW tlsSock;
    success = tlsSock.Connect(L"www.googleapis.com",443,true,5000);
    if (success != true) {
        wprintf(L"%s\n",tlsSock.lastErrorText());
        return;
    }

    // Send the request to obtain the access token.
    success = gAuth.ObtainAccessToken(tlsSock);
    if (success != true) {
        wprintf(L"%s\n",gAuth.lastErrorText());
        return;
    }

    // Examine the access token:
    wprintf(L"Access Token: %s\n",gAuth.accessToken());
    }