(PureBasic) 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

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkFileAccess.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkHttpRequest.pb"

Procedure ChilkatExample()

    ; 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

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkJsonObject::ckLoadFile(json,"qa_data/tokens/rabobank.json")
    If success <> 1
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    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

    req.i = CkHttpRequest::ckCreate()
    If req.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttpRequest::ckAddParam(req,"grant_type","refresh_token")
    CkHttpRequest::ckAddParam(req,"refresh_token",CkJsonObject::ckStringOf(json,"refresh_token"))

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
    CkHttp::setCkBasicAuth(http, 1)
    CkHttp::setCkLogin(http, "YOUR_APP_CLIENT_ID")
    CkHttp::setCkPassword(http, "YOUR_APP_CLIENT_SECRET")

    resp.i = CkHttp::ckPostUrlEncoded(http,"https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",req)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkJsonObject::ckDispose(json)
        CkHttpRequest::ckDispose(req)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    ; Load the JSON response.
    CkJsonObject::ckLoad(json,CkHttpResponse::ckBodyStr(resp))
    CkJsonObject::setCkEmitCompact(json, 0)

    ; Show the JSON response.
    Debug CkJsonObject::ckEmit(json)

    Debug "Response status code: " + Str(CkHttpResponse::ckStatusCode(resp))

    ; If the response status code is not 200, then it's an error.
    If CkHttpResponse::ckStatusCode(resp) <> 200
        CkJsonObject::ckDispose(json)
        CkHttpRequest::ckDispose(req)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    CkHttpResponse::ckDispose(resp)

    ; Save the refreshed access token JSON to a file for future requests.
    fac.i = CkFileAccess::ckCreate()
    If fac.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkFileAccess::ckWriteEntireTextFile(fac,"qa_data/tokens/rabobank.json",CkJsonObject::ckEmit(json),"utf-8",0)


    CkJsonObject::ckDispose(json)
    CkHttpRequest::ckDispose(req)
    CkHttp::ckDispose(http)
    CkFileAccess::ckDispose(fac)


    ProcedureReturn
EndProcedure