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(Delphi DLL) Get an Azure AD Access Token

Demonstrates how to obtain an Azure AD access token for authentication using a client ID, client secret, and tenant ID.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, FileAccess, Socket, AuthAzureAD, JsonObject, StringBuilder, StringArray;

...

procedure TForm1.Button1Click(Sender: TObject);
var
socket: HCkSocket;
success: Boolean;
azureAD: HCkAuthAzureAD;
json: HCkJsonObject;
fac: HCkFileAccess;
sa: HCkStringArray;
sbIdToken: HCkStringBuilder;
jsonIdToken: HCkJsonObject;
aud: PWideChar;
iss: PWideChar;
iat: Integer;
nbf: Integer;
exp: Integer;
aio: PWideChar;
app_displayname: PWideChar;
appid: PWideChar;
appidacr: PWideChar;
idp: PWideChar;
oid: PWideChar;
sid: PWideChar;
s_sub: PWideChar;
tid: PWideChar;
uti: PWideChar;
ver: PWideChar;

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

socket := CkSocket_Create();

// Make a TLS connection to login.microsoftonline.com, waiting at most 5000 milliseconds.
success := CkSocket_Connect(socket,'login.microsoftonline.com',443,True,5000);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

// Create an Azure AD auth object, and provide the required information for authorization.
azureAD := CkAuthAzureAD_Create();
CkAuthAzureAD_putClientId(azureAD,'AZURE_AD_CLIENT_ID');
CkAuthAzureAD_putClientSecret(azureAD,'AZURE_AD_CLIENT_SECRET');
CkAuthAzureAD_putTenantId(azureAD,'AZURE_TENANT_ID');

CkAuthAzureAD_putResource(azureAD,'https://outlook.office365.com/');

// Retrieve the access token using the TLS connection to login.microsoftonline.com
success := CkAuthAzureAD_ObtainAccessToken(azureAD,socket);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

// Show the access token, and then save it to a JSON file
// for future use (such as with a REST method call).
Memo1.Lines.Add('Azure AD Access Token = ' + CkAuthAzureAD__accessToken(azureAD));

json := CkJsonObject_Create();
CkJsonObject_AppendString(json,'accessToken',CkAuthAzureAD__accessToken(azureAD));

// Save our access token to a file.  It will be used in subsequent REST API calls.
fac := CkFileAccess_Create();
CkFileAccess_WriteEntireTextFile(fac,'qa_data/tokens/azureAD_office365.json',CkJsonObject__emit(json),'utf-8',False);

// Let's get the id information out of the access token.
// Our JSON looks like this:
// {"accessToken":"eyJ0eXAiO---TdjT3RjIn0.eyJhdWQiOiJo---jEuMCJ9.CIx0sUT8s---KvzKKUw"}

// I used "---" instead of "..." to indicate a large quantity of omitted chars.
// The accessToken is a long string composed of 3 base64 strings concatenated with "." chars.
// The 1st part is the JOSE header.  If you decode from base64, you'll get the JSON JOSE header.
// The 2nd part is the id token.  When decoded this is the JSON that contains information about the authenticated application.
// The 3rd part is binary and does not decode to JSON.

// Let's get the information from the 2nd part (the id token)
sa := CkStringArray_Create();
CkStringArray_SplitAndAppend(sa,CkJsonObject__stringOf(json,'accessToken'),'.');

sbIdToken := CkStringBuilder_Create();
// The 2nd string is at index 1.
CkStringBuilder_Append(sbIdToken,CkStringArray__getString(sa,1));
CkStringBuilder_Decode(sbIdToken,'base64','utf-8');

jsonIdToken := CkJsonObject_Create();
CkJsonObject_LoadSb(jsonIdToken,sbIdToken);
CkJsonObject_putEmitCompact(jsonIdToken,False);
Memo1.Lines.Add(CkJsonObject__emit(jsonIdToken));

// We have something like this:
// {
//   "aud": "https://outlook.office365.com/",
//   "iss": "https://sts.windows.net/6e8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
//   "iat": 1586350465,
//   "nbf": 1586350465,
//   "exp": 1586354365,
//   "aio": "42dgYNjyOtX8ZZB7JLfMFJGeKUmvAA==",
//   "app_displayname": "ChilkatTest",
//   "appid": "f125d695-c50e-456e-a578-a486f06d1213",
//   "appidacr": "1",
//   "idp": "https://sts.windows.net/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
//   "oid": "7545a2fd-3f0d-48a4-9c58-a1a5700a24b1",
//   "sid": "ab981252-9378-4d0c-964b-eb2e1451138f",
//   "sub": "7546a2fc-3f0d-48a4-9c58-a1a5700a24b1",
//   "tid": "6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd",
//   "uti": "huIJBAa1tvGpczwV5S1BAA",
//   "ver": "1.0"
// }

// Get the desired information from the JSON:
aud := CkJsonObject__stringOf(jsonIdToken,'aud');
iss := CkJsonObject__stringOf(jsonIdToken,'iss');
iat := CkJsonObject_IntOf(jsonIdToken,'iat');
nbf := CkJsonObject_IntOf(jsonIdToken,'nbf');
exp := CkJsonObject_IntOf(jsonIdToken,'exp');
aio := CkJsonObject__stringOf(jsonIdToken,'aio');
app_displayname := CkJsonObject__stringOf(jsonIdToken,'app_displayname');
appid := CkJsonObject__stringOf(jsonIdToken,'appid');
appidacr := CkJsonObject__stringOf(jsonIdToken,'appidacr');
idp := CkJsonObject__stringOf(jsonIdToken,'idp');
oid := CkJsonObject__stringOf(jsonIdToken,'oid');
sid := CkJsonObject__stringOf(jsonIdToken,'sid');
s_sub := CkJsonObject__stringOf(jsonIdToken,'sub');
tid := CkJsonObject__stringOf(jsonIdToken,'tid');
uti := CkJsonObject__stringOf(jsonIdToken,'uti');
ver := CkJsonObject__stringOf(jsonIdToken,'ver');

CkSocket_Dispose(socket);
CkAuthAzureAD_Dispose(azureAD);
CkJsonObject_Dispose(json);
CkFileAccess_Dispose(fac);
CkStringArray_Dispose(sa);
CkStringBuilder_Dispose(sbIdToken);
CkJsonObject_Dispose(jsonIdToken);

end;

 

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