Delphi ActiveX Requires Chilkat v10.1.3+

Datev OAuth2 Access Token

See more Datev Examples

Demonstrates how to get a Datev OAuth2 access token from a desktop application or script. Delphi ActiveX

var
success: Integer;
oauth2: TChilkatOAuth2;
url: WideString;
numMsWaited: Integer;
sbJson: TChilkatStringBuilder;

begin
success := 0;

//  To further clarify, see OAuth 2.0 Authorization Flow

oauth2 := TChilkatOAuth2.Create(Self);

//  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 := 1;
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.
url := oauth2.StartAuth();
if (oauth2.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

//  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 = 0) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

//  Wait for the interactive user to grant permission in the interactive browser session.
//  We'll wait for a max of 90 seconds.
numMsWaited := 0;
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) do
  begin
    oauth2.SleepMs(100);
    numMsWaited := numMsWaited + 100;
  end;

//  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) then
  begin
    oauth2.Cancel();
    Memo1.Lines.Add('No response from the browser!');
    Exit;
  end;

//  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) then
  begin
    Memo1.Lines.Add('OAuth2 failed to complete.');
    Memo1.Lines.Add(oauth2.FailureInfo);
    Exit;
  end;

if (oauth2.AuthFlowState = 4) then
  begin
    Memo1.Lines.Add('OAuth2 authorization was denied.');
    Memo1.Lines.Add(oauth2.AccessTokenResponse);
    Exit;
  end;

if (oauth2.AuthFlowState <> 3) then
  begin
    Memo1.Lines.Add('Unexpected AuthFlowState:' + IntToStr(oauth2.AuthFlowState));
    Exit;
  end;

//  Save the full JSON access token response to a file.
sbJson := TChilkatStringBuilder.Create(Self);
sbJson.Append(oauth2.AccessTokenResponse);
sbJson.WriteFile('qa_data/tokens/datev.json','utf-8',0);

//  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		
//  }

Memo1.Lines.Add('OAuth2 authorization granted!');
Memo1.Lines.Add('Access Token = ' + oauth2.AccessToken);