(Swift 3,4,5...) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
    // and saved in a JSON file.  

    // First get our previously obtained refresh token.
    // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
    let jsonToken = CkoJsonObject()!
    var success: Bool = jsonToken.loadFile("qa_data/tokens/geoop.json")

    let rest = CkoRest()!

    // Connect to GeoOp...
    var bAutoReconnect: Bool = true
    success = rest.connect("login.geoop.com", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // Set the X-Version header.
    rest.addHeader("X-Version", value: "1.0")

    // Provide the required form params to get the new access token
    print("refresh_token = \(jsonToken.string(of: "refresh_token")!)")
    rest.addQueryParam("refresh_token", value: jsonToken.string(of: "refresh_token"))
    rest.addQueryParam("grant_type", value: "refresh_token")
    rest.addQueryParam("client_id", value: "GEOOP-CLIENT-ID")
    rest.addQueryParam("client_secret", value: "GEOOP-CLIENT-SECRET")

    var responseBody: String? = rest.fullRequestFormUrlEncoded("POST", uriPath: "/oauth2/token")
    if rest.lastMethodSuccess != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // If the response status code did not indicate success, then see what happened..
    if rest.responseStatusCode.intValue != 200 {
        print("Request Header: ")
        print("\(rest.lastRequestHeader!)")
        print("----")
        print("Response StatusCode = \(rest.responseStatusCode.intValue)")
        print("Response StatusLine: \(rest.responseStatusText!)")
        print("Response Header:")
        print("\(rest.responseHeader!)")
        print("\(responseBody!)")
        return
    }

    let json = CkoJsonObject()!
    json.emitCompact = false
    json.load(responseBody)

    // Show the full JSON response.  It should contain the new access token...
    print("\(json.emit()!)")

}