(Go) 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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    // 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 := chilkat.NewPfx()
    success := pfx.LoadPfxFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret")
    if success != true {
        fmt.Println(pfx.LastErrorText())
        pfx.DisposePfx()
        return
    }

    gAuth := chilkat.NewAuthGoogle()
    success = gAuth.SetP12(pfx)

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

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

    // Request an access token that is valid for this many seconds.
    gAuth.SetExpireNumSeconds(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.)
    gAuth.SetSubEmailAddress("")

    // 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 := chilkat.NewSocket()
    success = tlsSock.Connect("www.googleapis.com",443,true,5000)
    if success != true {
        fmt.Println(tlsSock.LastErrorText())
        pfx.DisposePfx()
        gAuth.DisposeAuthGoogle()
        tlsSock.DisposeSocket()
        return
    }

    // Send the request to obtain the access token.
    success = gAuth.ObtainAccessToken(tlsSock)
    if success != true {
        fmt.Println(gAuth.LastErrorText())
        pfx.DisposePfx()
        gAuth.DisposeAuthGoogle()
        tlsSock.DisposeSocket()
        return
    }

    // Examine the access token:
    fmt.Println("Access Token: ", gAuth.AccessToken())

    pfx.DisposePfx()
    gAuth.DisposeAuthGoogle()
    tlsSock.DisposeSocket()