(Java) Quickbooks OAuth2 in a Desktop App

Demonstrates how to get a QuickBooks OAuth2 access token from a desktop application or script.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // ------------------------------------------------------------------------------------------------
    // IMPORTANT: You first need to define an App in the Quickbooks Developer Dashboard.
    // See How to Create an App in QuickBooks Developer Dashboard
    // ------------------------------------------------------------------------------------------------

    // This example is for desktop applicatons (it is not for code that runs on a web server).
    // You'll need to add a line (or a few lines of code) to popup a web browser that navigates to a URL.
    // This is explained in the comments below.

    // This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
    // repeatedly refreshed without user interaction, as shown in this example: Refresh Quickbooks OAuth2 Access Token.

    CkOAuth2 oauth2 = new CkOAuth2();
    boolean success;

    // QuickBooks OAuth2 allows for an "http://localhost:<portNumber>/" callback URL for sandbox testing,
    // but not for production.
    // For a desktop app, you must provide a script on your web server to redirect to "http://localhost/<portNumber>"
    // It can be written in C#, PHP, or whatever desired.  It must include the query string in the redirection.
    // For example, in PHP your script would look like this:

    // <?php
    //   header( 'Location: http://localhost:3017?' . $_SERVER['QUERY_STRING'] );
    // ?>

    oauth2.put_AppCallbackUrl("https://yourwebserver.com/OAuth2.php");
    oauth2.put_ListenPort(3017);

    oauth2.put_AuthorizationEndpoint("https://appcenter.intuit.com/connect/oauth2");
    oauth2.put_TokenEndpoint("https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer");

    // Replace these with actual values.
    oauth2.put_ClientId("QUICKBOOKS-CLIENT-ID");
    oauth2.put_ClientSecret("QUICKBOOKS-CLIENT-SECRET");
    oauth2.put_UseBasicAuth(true);
    oauth2.put_CodeChallenge(false);

    // Indicate the desired access.  Possible scopes that can appear in the list are:
    // com.intuit.quickbooks.accounting:  QuickBooks Online API
    // com.intuit.quickbooks.payment:  QuickBooks Payments API
    // openid:  OpenID Connect processing
    // profile:  user's given and family names
    // email:  user's email address
    // phone:  user's phone number
    // address:  user's physical address
    oauth2.put_Scope("com.intuit.quickbooks.accounting");

    // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
    String url = oauth2.startAuth();
    if (oauth2.get_LastMethodSuccess() != true) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    System.out.println("url = " + url);

    // At this point, your application should load the URL in a browser.
    // For example, 
    // in C#: System.Diagnostics.Process.Start(url);
    // in Java: Desktop.getDesktop().browse(new URI(url));
    // in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
    //              wsh.Run url
    // in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
    // in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl
    // in dBASE: run(false, 'rundll32 url.dll,FileProtocolHandler "' + lcUrl + '"')
    // The QuickBooks account owner would interactively accept or deny the authorization request.

    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...

    // Now wait for the authorization.
    // We'll wait for a max of 60 seconds.
    int numMsWaited = 0;
    while ((numMsWaited < 60000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited+100;
        }

    // If there was no response from the browser within 60 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if (oauth2.get_AuthFlowState() < 3) {
        oauth2.Cancel();
        System.out.println("No response from the browser!");
        return;
        }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    if (oauth2.get_AuthFlowState() == 5) {
        System.out.println("OAuth2 failed to complete.");
        System.out.println(oauth2.failureInfo());
        return;
        }

    if (oauth2.get_AuthFlowState() == 4) {
        System.out.println("OAuth2 authorization was denied.");
        System.out.println(oauth2.accessTokenResponse());
        return;
        }

    if (oauth2.get_AuthFlowState() != 3) {
        System.out.println("Unexpected AuthFlowState:" + oauth2.get_AuthFlowState());
        return;
        }

    // Save the full JSON access token response to a file.
    CkStringBuilder sbJson = new CkStringBuilder();
    sbJson.Append(oauth2.accessTokenResponse());
    sbJson.WriteFile("qa_data/tokens/qb-access-token.json","utf-8",false);

    // The full JSON received looks like this:
    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

    System.out.println("OAuth2 authorization granted!");
    System.out.println("Access Token = " + oauth2.accessToken());
  }
}