(Xojo Plugin) 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

Dim json As New Chilkat.JsonObject
Dim success As Boolean
success = json.LoadFile("qa_data/tokens/rabobank.json")
If (success <> True) Then
    Return
End If

// {
//   "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

Dim req As New Chilkat.HttpRequest
req.AddParam "grant_type","refresh_token"
req.AddParam "refresh_token",json.StringOf("refresh_token")

Dim http As New Chilkat.Http

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

Dim resp As Chilkat.HttpResponse
resp = http.PostUrlEncoded("https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",req)
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// Load the JSON response.
success = json.Load(resp.BodyStr)
json.EmitCompact = False

// Show the JSON response.
System.DebugLog(json.Emit())

System.DebugLog("Response status code: " + Str(resp.StatusCode))

// If the response status code is not 200, then it's an error.
If (resp.StatusCode <> 200) Then
    Return
End If

// Save the refreshed access token JSON to a file for future requests.
Dim fac As New Chilkat.FileAccess
success = fac.WriteEntireTextFile("qa_data/tokens/rabobank.json",json.Emit(),"utf-8",False)