(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.

    // --------------------------------------------------------------------------------
    // 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.
    pfx := Pfx_Ref.html">chilkat.NewPfx()
    success := pfx.LoadPfxFile("qa_data/pfx/chilkat25-cbd7b42afbd8.p12","notasecret")
    if success != true {
        fmt.Println(pfx.LastErrorText())
        pfx.DisposePfx()
        return
    }

    gAuth := AuthGoogle_Ref.html">chilkat.NewAuthGoogle()
    success = gAuth.SetP12(pfx)

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

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

    // The sub is your company email address
    oauth_sub := "info@chilkat.xyz"

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

    gAuth.SetEmailAddress(iss)
    gAuth.SetScope(scope)
    gAuth.SetExpireNumSeconds(numSec)
    gAuth.SetSubEmailAddress(oauth_sub)

    // Connect to www.googleapis.com
    tlsSock := Socket_Ref.html">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()