(Delphi ActiveX) Azure REST API Access Token

Demonstrates how to request an Azure REST API OAUTH2 access token.

Note: In order to access resources a Service Principal needs to be created in your Tenant. It is really convenient to do it via AZ CLI:

az ad sp create-for-rbac --name [APP_NAME] --password [CLIENT_SECRET]

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: TChilkatRest;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
success: Integer;
strResponseBody: WideString;
respStatusCode: Integer;
json: TChilkatJsonObject;

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

rest := TChilkatRest.Create(Self);

// URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
bTls := 1;
port := 443;
bAutoReconnect := 1;
success := rest.Connect('login.microsoftonline.com',port,bTls,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(rest.ConnectFailReason));
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// Add query params to the request.
rest.AddQueryParam('grant_type','client_credentials');
rest.AddQueryParam('client_id','APP_ID');
rest.AddQueryParam('client_secret','CLIENT_SECRET');
// Note: The resource must match the API for which you're using the access token..
rest.AddQueryParam('resource','https://management.azure.com/');

strResponseBody := rest.FullRequestFormUrlEncoded('POST','/TENANT_ID/oauth2/token');
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
respStatusCode := rest.ResponseStatusCode;
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(rest.ResponseHeader);
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(strResponseBody);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.Load(strResponseBody);
json.EmitCompact := 0;
Memo1.Lines.Add(json.Emit());

// The result is an access token such as the following:

// {
//   "token_type": "Bearer",
//   "expires_in": "3600",
//   "ext_expires_in": "3600",
//   "expires_on": "1557864616",
//   "not_before": "1557860716",
//   "resource": "https://management.azure.com/",
//   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
// }

// We'll save this JSON to a file for other examples to use..
json.WriteFile('qa_data/tokens/azureToken.json');
end;