Delphi ActiveX Requires Chilkat v10.1.2+

GeoOp OAuth2 Authorisation Code Grant (Public App)

See more OAuth2 Examples

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow. Delphi ActiveX

var
success: Integer;
oauth2: TChilkatOAuth2;
url: WideString;
numMsWaited: Integer;
fac: TCkFileAccess;

begin
success := 0;

//  It requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

oauth2 := TChilkatOAuth2.Create(Self);

//  This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
oauth2.ListenPort := 3017;

oauth2.AuthorizationEndpoint := 'https://login.geoop.com/oauth2/code';
oauth2.TokenEndpoint := 'https://login.geoop.com/oauth2/token';

//  Replace the client ID with an actual value.
oauth2.ClientId := 'GEOOP-APPLICATION-ID';
//  The ClientSecret should remain empty for a GeoOp public application
oauth2.ClientSecret := '';

//  We need a few special settings for GeoOp
oauth2.Scope := 'default';
oauth2.CodeChallenge := 0;
//  Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
//  Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
//  number matches the ListenPort above.
oauth2.LocalHost := 'none';

//  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 user to approve or deny authorization in the browser.
numMsWaited := 0;
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) do
  begin
    oauth2.SleepMs(100);
    numMsWaited := numMsWaited + 100;
  end;

//  If the browser does not respond within the specified time, AuthFlowState will be:
//  
//  1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
//  2: Waiting for Final Response – The thread is awaiting the final access token response.
//  In either case, cancel the background task initiated by StartAuth.

if (oauth2.AuthFlowState < 3) then
  begin
    oauth2.Cancel();
    Memo1.Lines.Add('No response from the browser!');
    Exit;
  end;

//  Check AuthFlowState to determine if authorization was granted, denied, or failed:
//  
//  3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
//  4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
//  5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

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

//  Save the entire JSON response, which includes the access token, for future calls.
//  The JSON AccessTokenResponse looks like this:
//  {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

fac := TCkFileAccess.Create(Self);
fac.WriteEntireTextFile('qa_data/tokens/geoop.json',oauth2.AccessTokenResponse,'utf-8',0);

Memo1.Lines.Add('Success.');