(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.

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#include <C_CkPfx.h>
#include <C_CkAuthGoogle.h>
#include <C_CkSocket.h>

void ChilkatSample(void)
    {
    HCkPfx pfx;
    BOOL success;
    HCkAuthGoogle gAuth;
    HCkSocket tlsSock;

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

    // First load the PKCS12 (.p12 / .pfx) into a PFX object.
    pfx = CkPfx_Create();
    success = CkPfx_LoadPfxFile(pfx,"qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret");
    if (success != TRUE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkPfx_Dispose(pfx);
        return;
    }

    gAuth = CkAuthGoogle_Create();
    success = CkAuthGoogle_SetP12(gAuth,pfx);

    // Set the client email address.
    CkAuthGoogle_putEmailAddress(gAuth,"pip-563@chilkatcloud.iam.gserviceaccount.com");

    // Choose a scope.
    CkAuthGoogle_putScope(gAuth,"https://www.googleapis.com/auth/cloud-platform");

    // Request an access token that is valid for this many seconds.
    CkAuthGoogle_putExpireNumSeconds(gAuth,3600);

    // If the application is requesting delegated access:
    // The email address of the user for which the application is requesting delegated access,
    // then set the email address here. (Otherwise leave it empty.)
    CkAuthGoogle_putSubEmailAddress(gAuth,"");

    // Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
    // The Chilkat socket object is used so that the connection can be established
    // through proxies or an SSH tunnel if desired.
    tlsSock = CkSocket_Create();
    success = CkSocket_Connect(tlsSock,"www.googleapis.com",443,TRUE,5000);
    if (success != TRUE) {
        printf("%s\n",CkSocket_lastErrorText(tlsSock));
        CkPfx_Dispose(pfx);
        CkAuthGoogle_Dispose(gAuth);
        CkSocket_Dispose(tlsSock);
        return;
    }

    // Send the request to obtain the access token.
    success = CkAuthGoogle_ObtainAccessToken(gAuth,tlsSock);
    if (success != TRUE) {
        printf("%s\n",CkAuthGoogle_lastErrorText(gAuth));
        CkPfx_Dispose(pfx);
        CkAuthGoogle_Dispose(gAuth);
        CkSocket_Dispose(tlsSock);
        return;
    }

    // Examine the access token:
    printf("Access Token: %s\n",CkAuthGoogle_accessToken(gAuth));


    CkPfx_Dispose(pfx);
    CkAuthGoogle_Dispose(gAuth);
    CkSocket_Dispose(tlsSock);

    }