C++

Datev OAuth2 Access Token

See more Datev Examples

Demonstrates how to get a Datev OAuth2 access token from a desktop application or script. C++

#include <CkOAuth2.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  To further clarify, see OAuth 2.0 Authorization Flow

    CkOAuth2 oauth2;

    //  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.
    const char *url = oauth2.startAuth();
    if (oauth2.get_LastMethodSuccess() != true) {
        std::cout << oauth2.lastErrorText() << "\r\n";
        return;
    }

    //  Launch the default browser on the system and navigate to the url.
    //  The LaunchBrowser method was added in Chilkat v10.1.2.
    success = oauth2.LaunchBrowser(url);
    if (success == false) {
        std::cout << oauth2.lastErrorText() << "\r\n";
        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();
        std::cout << "No response from the browser!" << "\r\n";
        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) {
        std::cout << "OAuth2 failed to complete." << "\r\n";
        std::cout << oauth2.failureInfo() << "\r\n";
        return;
    }

    if (oauth2.get_AuthFlowState() == 4) {
        std::cout << "OAuth2 authorization was denied." << "\r\n";
        std::cout << oauth2.accessTokenResponse() << "\r\n";
        return;
    }

    if (oauth2.get_AuthFlowState() != 3) {
        std::cout << "Unexpected AuthFlowState:" << oauth2.get_AuthFlowState() << "\r\n";
        return;
    }

    //  Save the full JSON access token response to a file.
    CkStringBuilder sbJson;
    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		
    //  }

    std::cout << "OAuth2 authorization granted!" << "\r\n";
    std::cout << "Access Token = " << oauth2.accessToken() << "\r\n";
    }