(Visual FoxPro) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loJson
LOCAL loReq
LOCAL loHttp
LOCAL loResp
LOCAL loFac

lnSuccess = 0

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

loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loJson.LoadFile("qa_data/tokens/msGraphCalendar.json")
IF (lnSuccess <> 1) THEN
    RELEASE loJson
    CANCEL
ENDIF

loReq = CreateObject('Chilkat.HttpRequest')
loReq.AddParam("grant_type","refresh_token")
loReq.AddParam("redirect_uri","http://localhost:3017/")
loReq.AddParam("client_id","MICROSOFT-GRAPH-CLIENT-ID")
loReq.AddParam("client_secret","MICROSOFT-GRAPH-CLIENT-SECRET")
loReq.AddParam("refresh_token",loJson.StringOf("refresh_token"))
loReq.AddParam("scope","openid profile offline_access user.readwrite calendars.readwrite files.readwrite")

loHttp = CreateObject('Chilkat.Http')

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

loResp = CreateObject('Chilkat.HttpResponse')
lnSuccess = loHttp.HttpReq("https://login.microsoftonline.com/common/oauth2/v2.0/token",loReq,loResp)
IF (lnSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loJson
    RELEASE loReq
    RELEASE loHttp
    RELEASE loResp
    CANCEL
ENDIF

* Load the JSON response.
loJson.Load(loResp.BodyStr)
loJson.EmitCompact = 0

* Show the JSON response.
? loJson.Emit()

? "Response status code: " + STR(loResp.StatusCode)

* If the response status code is not 200, then it's an error.
IF (loResp.StatusCode <> 200) THEN
    RELEASE loJson
    RELEASE loReq
    RELEASE loHttp
    RELEASE loResp
    CANCEL
ENDIF

* Save the refreshed access token JSON to a file for future requests.
loFac = CreateObject('Chilkat.FileAccess')
loFac.WriteEntireTextFile("qa_data/tokens/msGraphCalendar.json",loJson.Emit(),"utf-8",0)

? "Success."

RELEASE loJson
RELEASE loReq
RELEASE loHttp
RELEASE loResp
RELEASE loFac