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Refresh a Dynamics CRM OAuth2 Access Token

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Demonstrates how to refresh an expiring Dynamics CRM access token using the refresh token. endpoint.

(If a REST API call fails with a 401 unauthorized error, an application can auto-recover by refreshing the access token, and then re-send the request using the new token.)

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Local $bSuccess = False

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

; We previously obtained an access token and saved the JSON to a file using this example:
; Get Dynamics CRM OAuth2 Access Token

; This example will examine the JSON and expiration date, and if near expiration will
; refresh the access token.

$oJson = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJson.LoadFile("qa_data/tokens/dynamicsCrm.json")
If ($bSuccess <> True) Then
    Exit
EndIf

; The contents of the JSON look like this:
; {
;   "token_type": "Bearer",
;   "scope": "user_impersonation",
;   "expires_in": "3599",
;   "ext_expires_in": "0",
;   "expires_on": "1524783438",
;   "not_before": "1524779538",
;   "resource": "https://mydomain.api.crm.dynamics.com",
;   "access_token": "...",
;   "refresh_token": "...",
;   "id_token": "..."
; }

; The "expires_on" value is a Unix time.
$oDtExpire = ObjCreate("Chilkat.CkDateTime")
$oDtExpire.SetFromUnixTime(False,$oJson.IntOf("expires_on"))

; If this date/time expires within 10 minutes of the current system time, refresh the token.

; OK, we need to refresh the access token by sending a POST...
; 

$oReq = ObjCreate("Chilkat.HttpRequest")
$oReq.AddParam "grant_type","refresh_token"
$oReq.AddParam "redirect_uri","http://localhost:3017/"
$oReq.AddParam "client_id","DYNAMICS-CRM-CLIENT-ID"
$oReq.AddParam "client_secret","DYNAMICS-CRM-SECRET-KEY"
$oReq.AddParam "refresh_token",$oJson.StringOf("refresh_token")
$oReq.AddParam "resource","https://mydynamicsdomain.api.crm.dynamics.com"

$oHttp = ObjCreate("Chilkat.Http")

$oReq.HttpVerb = "POST"
$oReq.ContentType = "application/x-www-form-urlencoded"

$oResp = ObjCreate("Chilkat.HttpResponse")
$bSuccess = $oHttp.HttpReq("https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token",$oReq,$oResp)
If ($bSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

; Load the JSON response.
$oJson.Load($oResp.BodyStr)
$oJson.EmitCompact = False

; Show the JSON response.
ConsoleWrite($oJson.Emit() & @CRLF)

ConsoleWrite("Response status code: " & $oResp.StatusCode & @CRLF)

; If the response status code is not 200, then it's an error.
If ($oResp.StatusCode <> 200) Then
    Exit
EndIf

; If an "expires_on" member does not exist, then add the JSON member by
; getting the current system date/time and adding the "expires_in" seconds.
; This way we'll know when the token expires.
If ($oJson.HasMember("expires_on") <> True) Then
    $oDtExpire.SetFromCurrentSystemTime()
    $oDtExpire.AddSeconds($oJson.IntOf("expires_in"))
    $oJson.AppendString("expires_on",$oDtExpire.GetAsUnixTimeStr(False))
EndIf

; Save the refreshed access token JSON to a file for future requests.
$oFac = ObjCreate("Chilkat.FileAccess")
$oFac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",$oJson.Emit(),"utf-8",False)