(Java) Datev OAuth2 Access Token

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Note: This example requires Chilkat v10.1.3 or greater.

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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[])
  {
    // To further clarify, see OAuth 2.0 Authorization Flow

    CkOAuth2 oauth2 = new CkOAuth2();

    // Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
    oauth2.put_ListenPort(3017);

    // 

    oauth2.put_AuthorizationEndpoint("https://login.datev.de/openidsandbox/authorize");
    oauth2.put_TokenEndpoint("https://sandbox-api.datev.de/token");

    // Replace this with your actual client ID.
    oauth2.put_ClientId("DATEV_CLIENT_ID");
    oauth2.put_ClientSecret("DATEV_CLIENT_SECRET");

    oauth2.put_CodeChallenge(true);
    oauth2.put_CodeChallengeMethod("S256");

    oauth2.put_Scope("openid profile email datev:accounting:clients accounting:documents datev:accounting:extf-files-import");

    // Begin the OAuth2 authorization code 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;
        }

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    boolean success = oauth2.LaunchBrowser(url);
    if (success == false) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    // Wait for the interactive user to grant permission in the interactive browser session.
    // We'll wait for a max of 90 seconds.
    int numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited+100;
        }

    // If there was no response from the browser within 90 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/datev.json","utf-8",false);

    // The saved JSON response looks like this:

    // {
    // 	"refresh_token": "ZDA5Y .... FFhTXc9",
    // 	"refresh_token_expires_in": 39600,
    // 	"id_token": "eyJ .... Q9w",
    // 	"access_token": "MTM .... 1UDA9",
    // 	"token_type": "bearer",
    // 	"expires_in": 900		
    // }

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