Lazarus Pascal Requires Chilkat v11.0.0+

Azure OAuth2 Client Credentials Grant Flow

See more OAuth2 Examples

Demonstrates how to get an OAuth2 access token for an Azure Registered App using the Client Credentials Grant Flow.

Note: Your Azure app must be registered as a single-tenant app to use client credentials.

Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.HttpRequest,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  req: THttpRequest;
  url: string;
  resp: THttpResponse;
  statusCode: Integer;
  json: TJsonObject;

begin
  success := False;

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

  http := THttp.Create;

  req := THttpRequest.Create;
  req.AddParam('client_secret','CLIENT_SECRET');
  req.AddParam('client_id','CLIENT_ID');

  //  See Understanding Scopes in Azure OAuth2 Client Credentials Flow
  req.AddParam('scope','https://graph.microsoft.com/.default');

  req.AddParam('grant_type','client_credentials');

  //  Note: Your Azure app must be registered as a single-tenant app to use client credentials.
  //  Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
  url := 'https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token';

  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  resp := THttpResponse.Create;
  success := http.HttpReq(url,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := resp.StatusCode;
  WriteLn('Response status code = ' + statusCode);

  json := TJsonObject.Create;
  json.Load(resp.BodyStr);

  json.EmitCompact := False;
  WriteLn(json.Emit());

  //  Sample successful output:

  //  {
  //    "token_type": "Bearer",
  //    "expires_in": 3599,
  //    "ext_expires_in": 3599,
  //    "access_token": "eyJ0eX...K0jOERg"
  //  }

  if (statusCode = 200) then
    begin
      json.WriteFile('qa_data/tokens/azureClientCredentialsToken.json');
      WriteLn('Success.');
    end
  else
    begin
      WriteLn('Failed.');
    end;


  http.Free;
  req.Free;
  resp.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.