(Swift) Refresh Expiring OAuth2 Access Token for Azure Registered App

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func chilkatTest() {
    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get OAuth2 Access Token for Azure Registered App

    // This example will examine the JSON and expiration date, and if near expiration will
    // refresh the access token.

    let json = CkoJsonObject()!
    var success: Bool = json.loadFile("qa_data/tokens/_myAzureApp.json")
    if success != true {
        print("Failed to load the access token.")
        return
    }

    // The contents of the JSON look like this:
    // {
    //   "token_type": "Bearer",
    //   "scope": "User.Read Mail.ReadWrite Mail.Send",
    //   "expires_in": 3600,
    //   "ext_expires_in": 0,
    //   "access_token": "EwBAA8l6B...",
    //   "refresh_token": "MCRMdbe6Cd...",
    //   "id_token": "eyJ0eXAiOiJ...",
    //   "expires_on": "1494112119"
    // }

    // The "expires_on" value is a Unix time.
    let dtExpire = CkoDateTime()!
    dtExpire.setFromUnixTime(false, t: json.int(of: "expires_on").intValue)

    // If this date/time expires within 10 minutes of the current system time, refresh the token.
    if dtExpire.expires(within: 10, units: "minutes") != true {
        print("No need to refresh, the access token won't expire within the next 10 minutes.")
        return
    }

    // OK, we need to refresh the access token..
    let oauth2 = CkoOAuth2()!

    // Note: The endpoint depends on the Azure App Registration.
    // See How to Choose the Correct Endpoints for your Azure App Registration
    oauth2.tokenEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token"

    // Use your client ID.
    oauth2.clientId = "CLIENT_ID"

    // Get the existing refresh token.
    oauth2.refreshToken = json.string(of: "refresh_token")

    // Send the HTTP POST to refresh the access token.
    success = oauth2.refreshAccessToken()
    if success == false {
        print("\(oauth2.lastErrorText!)")
        return
    }

    print("OAuth2 authorization granted!")
    print("Access Token = \(oauth2.accessToken!)")

    // Get the full JSON response:
    json.load(oauth2.accessTokenResponse)
    json.emitCompact = false

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if json.hasMember("expires_on") != true {
        dtExpire.setFromCurrentSystemTime()
        dtExpire.addSeconds(json.int(of: "expires_in").intValue)
        json.append("expires_on", value: dtExpire.getAsUnixTimeStr(false))
    }

    print("\(json.emit()!)")

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

}