Node.js

Datev OAuth2 Access Token

See more Datev Examples

Demonstrates how to get a Datev OAuth2 access token from a desktop application or script. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // To further clarify, see OAuth 2.0 Authorization Flow

    var oauth2 = new chilkat.OAuth2();

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

    // 

    oauth2.AuthorizationEndpoint = "https://login.datev.de/openidsandbox/authorize";
    oauth2.TokenEndpoint = "https://sandbox-api.datev.de/token";

    // Replace this with your actual client ID.
    oauth2.ClientId = "DATEV_CLIENT_ID";
    oauth2.ClientSecret = "DATEV_CLIENT_SECRET";

    oauth2.CodeChallenge = true;
    oauth2.CodeChallengeMethod = "S256";

    oauth2.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.
    var url = oauth2.StartAuth();
    if (oauth2.LastMethodSuccess !== true) {
        console.log(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.
    success = oauth2.LaunchBrowser(url);
    if (success == false) {
        console.log(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.
    var numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.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.AuthFlowState < 3) {
        oauth2.Cancel();
        console.log("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.AuthFlowState == 5) {
        console.log("OAuth2 failed to complete.");
        console.log(oauth2.FailureInfo);
        return;
    }

    if (oauth2.AuthFlowState == 4) {
        console.log("OAuth2 authorization was denied.");
        console.log(oauth2.AccessTokenResponse);
        return;
    }

    if (oauth2.AuthFlowState !== 3) {
        console.log("Unexpected AuthFlowState:" + oauth2.AuthFlowState);
        return;
    }

    // Save the full JSON access token response to a file.
    var sbJson = new chilkat.StringBuilder();
    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		
    // }

    console.log("OAuth2 authorization granted!");
    console.log("Access Token = " + oauth2.AccessToken);

}

chilkatExample();