(Lianja) Rabobank Refresh OAuth2 Access Token

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.)

For more information, see https://developer.rabobank.nl/implementoauth2

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// 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 Rabobank OAuth2 Access Token

loJson = createobject("CkJsonObject")
llSuccess = loJson.LoadFile("qa_data/tokens/rabobank.json")
if (llSuccess <> .T.) then
    release loJson
    return
endif

// {
//   "token_type": "Bearer",
//   "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
//   "expires_in": 3600,
//   "consented_on": 1584641121,
//   "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
//   "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
//   "refresh_token_expires_in": 157784760,
//   "expires_on": "1584644722"
// }

// Refresh the access token by sending a POST like this:
// 

// POST /oauth2/token
// Headers:
//     Content-Type: application/x-www-form-urlencoded
//     Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
// 
// Body (x-www-form-urlencoded):
//     grant_type: refresh_token
//     refresh_token: REFRESH_TOKEN

loReq = createobject("CkHttpRequest")
loReq.AddParam("grant_type","refresh_token")
loReq.AddParam("refresh_token",loJson.StringOf("refresh_token"))

loHttp = createobject("CkHttp")

// Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
loHttp.BasicAuth = .T.
loHttp.Login = "YOUR_APP_CLIENT_ID"
loHttp.Password = "YOUR_APP_CLIENT_SECRET"

loResp = loHttp.PostUrlEncoded("https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",loReq)
if (loHttp.LastMethodSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loJson
    release loReq
    release loHttp
    return
endif

// Load the JSON response.
loJson.Load(loResp.BodyStr)
loJson.EmitCompact = .F.

// 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
    return
endif

release loResp

// Save the refreshed access token JSON to a file for future requests.
loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/rabobank.json",loJson.Emit(),"utf-8",.F.)


release loJson
release loReq
release loHttp
release loFac