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Get Google API Access Token using JSON Private Key using NIST Time Server Date/Time

Demonstrates how to get a Google API access token using a JSON service account private key, using the NIST time server date/time rather than the local system date/time. AutoIt

Local $bSuccess = False

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

; First, let's get the current date/time from time-c.nist.gov
$oSocket = ObjCreate("Chilkat.Socket")

; Connect to an NIST time server and read the current date/time
Local $iMaxWaitMs = 8000
Local $bUseTls = False
$bSuccess = $oSocket.Connect("time-c.nist.gov",37,$bUseTls,$iMaxWaitMs)
If ($bSuccess <> True) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

; The time server will send a big-endian 32-bit integer representing
; the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
; The ReceiveInt32 method will receive a 4-byte integer, but returns
; True or False to indicate success.  If successful, the integer
; is obtained via the ReceivedInt property.
Local $bigEndian = True
$bSuccess = $oSocket.ReceiveInt32($bigEndian)
If ($bSuccess <> True) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

$oDt = ObjCreate("Chilkat.CkDateTime")
$oDt.SetFromNtpTime($oSocket.ReceivedInt)

; Show the current local date/time
Local $bLocalTime = True
ConsoleWrite("Current local date/time: " & $oDt.GetAsRfc822($bLocalTime) & @CRLF)

$iMaxWaitMs = 10
$oSocket.Close($iMaxWaitMs)

; ------------------------------------------------------------------------
; OK, we have the current date/time.  We'll use it to set the IAT property
; in the code below.

; First load the JSON key into a string.
$oFac = ObjCreate("Chilkat.FileAccess")
Local $sJsonKey = $oFac.ReadEntireTextFile("qa_data/googleApi/ChilkatTest-ab2ecd52ef98.json","utf-8")
If ($oFac.LastMethodSuccess <> True) Then
    ConsoleWrite($oFac.LastErrorText & @CRLF)
    Exit
EndIf

; A JSON private key should look like this:

; 	{
; 	  "type": "service_account",
; 	  "project_id": "chilkattest-1350",
; 	  "private_key_id": "fa2e36ee26986eab628b59868af8bec1d1c64c38",
; 	  "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIjFa...28N64N2n1E4FYzBZjSdy\n-----END PRIVATE KEY-----\n",
; 	  "client_email": "598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a@developer.gserviceaccount.com",
; 	  "client_id": "598922945226-00rb0ppfg0snd9jo7bhvd4v17jtj2d3a.apps.googleusercontent.com",
; 	  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
; 	  "token_uri": "https://accounts.google.com/o/oauth2/token",
; 	  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
; 	  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a%40developer.gserviceaccount.com"
; 	}

$oGAuth = ObjCreate("Chilkat.AuthGoogle")
$oGAuth.JsonKey = $sJsonKey

; Choose a scope.
$oGAuth.Scope = "https://www.googleapis.com/auth/cloud-platform"

; Request an access token that is valid for this many seconds.
$oGAuth.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.)
$oGAuth.SubEmailAddress = ""

; ------------------------------------------------------------------------
; Set the IAT using the date/time from the NIST time server.
Local $iUnixTime = $oDt.GetAsUnixTime(False)
ConsoleWrite("unixTime = " & $iUnixTime & @CRLF)
$oGAuth.Iat = $iUnixTime

; 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.
$oTlsSock = ObjCreate("Chilkat.Socket")
$bSuccess = $oTlsSock.Connect("www.googleapis.com",443,True,5000)
If ($bSuccess <> True) Then
    ConsoleWrite($oTlsSock.LastErrorText & @CRLF)
    Exit
EndIf

; Send the request to obtain the access token.
$bSuccess = $oGAuth.ObtainAccessToken($oTlsSock)
If ($bSuccess <> True) Then
    ConsoleWrite($oGAuth.LastErrorText & @CRLF)
    Exit
EndIf

; Examine the access token:
ConsoleWrite("Access Token: " & $oGAuth.AccessToken & @CRLF)