(VB.NET) 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.
Dim pfx As New Chilkat.Pfx
Dim success As Boolean = pfx.LoadPfxFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret")
If (success <> True) Then
    Debug.WriteLine(pfx.LastErrorText)
    Exit Sub
End If


Dim gAuth As New Chilkat.AuthGoogle
success = gAuth.SetP12(pfx)

' Set the client email address.
gAuth.EmailAddress = "pip-563@chilkatcloud.iam.gserviceaccount.com"

' Choose a scope.
gAuth.Scope = "https://www.googleapis.com/auth/cloud-platform"

' Request an access token that is valid for this many seconds.
gAuth.ExpireNumSeconds = 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.SubEmailAddress = ""

' 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.
Dim tlsSock As New Chilkat.Socket
success = tlsSock.Connect("www.googleapis.com",443,True,5000)
If (success <> True) Then
    Debug.WriteLine(tlsSock.LastErrorText)
    Exit Sub
End If


' Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock)
If (success <> True) Then
    Debug.WriteLine(gAuth.LastErrorText)
    Exit Sub
End If


' Examine the access token:
Debug.WriteLine("Access Token: " & gAuth.AccessToken)