Delphi DLL

Azure REST API Access Token

See more Azure OAuth2 Examples

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]

Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
strResponseBody: PWideChar;
respStatusCode: Integer;
json: HCkJsonObject;

begin
success := False;

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

rest := CkRest_Create();

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

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

strResponseBody := CkRest__fullRequestFormUrlEncoded(rest,'POST','/TENANT_ID/oauth2/token');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
respStatusCode := CkRest_getResponseStatusCode(rest);
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkRest__responseHeader(rest));
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(strResponseBody);
    Exit;
  end;

json := CkJsonObject_Create();
CkJsonObject_Load(json,strResponseBody);
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

// 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..
CkJsonObject_WriteFile(json,'qa_data/tokens/azureToken.json');

CkRest_Dispose(rest);
CkJsonObject_Dispose(json);

end;