(Swift) 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.)

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

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

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func chilkatTest() {
    var success: Bool = 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 Rabobank OAuth2 Access Token

    let json = CkoJsonObject()!
    success = json.loadFile("qa_data/tokens/rabobank.json")
    if success != true {
        return
    }

    // {
    //   "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

    let req = CkoHttpRequest()!
    req.addParam("grant_type", value: "refresh_token")
    req.addParam("refresh_token", value: json.string(of: "refresh_token"))

    let http = CkoHttp()!

    // 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"

    req.httpVerb = "POST"
    req.contentType = "application/x-www-form-urlencoded"

    let resp = CkoHttpResponse()!
    success = http.httpReq("https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token", request: req, response: resp)
    if success == false {
        print("\(http.lastErrorText!)")
        return
    }

    // Load the JSON response.
    json.load(resp.bodyStr)
    json.emitCompact = false

    // Show the JSON response.
    print("\(json.emit()!)")

    print("Response status code: \(resp.statusCode.intValue)")

    // If the response status code is not 200, then it's an error.
    if resp.statusCode.intValue != 200 {
        return
    }

    // Save the refreshed access token JSON to a file for future requests.
    let fac = CkoFileAccess()!
    fac.writeEntireTextFile("qa_data/tokens/rabobank.json", fileData: json.emit(), charset: "utf-8", includePreamble: false)

}