(Swift) Dropbox Refresh OAuth2 Access Token

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

For more information, see https://www.dropbox.com/developers/documentation/http/documentation

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func chilkatTest() {
    var success: Bool = false

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

    let http = CkoHttp()!

    // Implements the following CURL command:

    // curl -X GET https://api.dropbox.com/oauth2/token \
    //     -d grant_type=refresh_token \
    //     -d refresh_token=<YOUR_REFRESH_TOKEN> \
    //     -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    http.login = "DROPBOX_APP_KEY"
    http.password = "DROPBOX_APP_SECRET"

    // Get the refresh token from the JSON we saved when originally getting the access token.
    // (See Get Dropbox OAuth2 Access Token w/ Refresh Token
    let json = CkoJsonObject()!
    success = json.loadFile("qa_data/tokens/dropbox.json")
    if success == false {
        print("\(json.lastErrorText!)")
        return
    }

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

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

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

    let sbResponseBody = CkoStringBuilder()!
    resp.getBodySb(sbResponseBody)

    let jResp = CkoJsonObject()!
    jResp.loadSb(sbResponseBody)
    jResp.emitCompact = false

    print("Response Body:")
    print("\(jResp.emit()!)")

    var respStatusCode: Int = resp.statusCode.intValue
    print("Response Status Code = \(respStatusCode)")
    if respStatusCode >= 400 {
        print("Response Header:")
        print("\(resp.header!)")
        print("Failed.")
        return
    }

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
    //   "token_type": "bearer",
    //   "expires_in": 14400
    // }

    var access_token: String? = jResp.string(of: "access_token")
    print("New Access Token: \(access_token!)")

    // Perhaps update our Dropbox JSON file with the new access token.
    // (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
    json.update("access_token", value: access_token)

    json.writeFile("qa_data/tokens/dropbox.json")

}