Delphi ActiveX

Decode Microsoft Graph ID Token

See more Microsoft Graph Examples

Demonstrates how to decode a Microsoft Graph ID token. Delphi ActiveX

var
success: Integer;
jsonToken: TChilkatJsonObject;
jwt: TChilkatJwt;
idToken: WideString;
jose: WideString;
jsonHeader: TChilkatJsonObject;
claims: WideString;
jsonClaims: TChilkatJsonObject;
ver: WideString;
iss: WideString;
s_sub: WideString;
aud: WideString;
exp: Integer;
iat: Integer;
nbf: Integer;
name: WideString;
preferred_username: WideString;
oid: WideString;
tid: WideString;
aio: WideString;

begin
success := 0;

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

//  This example loads an id_token and decodes it.

//  Our Microsoft Graph OAuth2 token looks like this:

//  {
//    "token_type": "Bearer",
//    "scope": "openid profile User.ReadWrite Mail.ReadWrite Mail.Send Files.ReadWrite User.Read Calendars.ReadWrite Group.ReadWrite.All",
//    "expires_in": 3600,
//    "ext_expires_in": 3600,
//    "access_token": "EwCQA8l6...0HhMKYwC",
//    "refresh_token": "MCWulIvzi2yD0S...igEFn51mqcByhZtAJg",
//    "id_token": "eyJ0eXAiOiJKV1...Q7lRDaR-7A",
//    "expires_on": "1562862714"
//  }

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/microsoftGraph.json');
if (success = 0) then
  begin
    Memo1.Lines.Add('Failed to load the JSON file...');
    Exit;
  end;

//  Use Chilkat's JWT API to examine the id_token..
jwt := TChilkatJwt.Create(Self);
idToken := jsonToken.StringOf('id_token');

//  Extract the JOSE header..
jose := jwt.GetHeader(idToken);

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

//  The JOSE header looks like this:

//  {
//    "typ": "JWT",
//    "alg": "RS256",
//    "kid": "1LTMzakihiRla_8z2BEJVXeWMqo"
//  }

claims := jwt.GetPayload(idToken);

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

//  The claims look like this:

//  {
//    "ver": "2.0",
//    "iss": "https://login.microsoftonline.com/9188040d-6c67-4c5b-b112-36a304b66dad/v2.0",
//    "sub": "AAAAAAAAAAAAAAAAAAAAAHJFryd6Gydo-XtTd1nhUNQ",
//    "aud": "18c456bd-db75-43fe-9724-9e5d821c68ff",
//    "exp": 1562945513,
//    "iat": 1562858813,
//    "nbf": 1562858813,
//    "name": "Matt Chilkat",
//    "preferred_username": "matt@example.com",
//    "oid": "00000000-0000-0000-3a33-fceb9b74cc15",
//    "tid": "9188040d-6c67-4c5b-b112-36a304b66dad",
//    "aio": "DfibJqKnWC1c0FS6G ... W6pvTrQuYzyq16ghY$"
//  }
//  

//  Use this online tool to generate parsing code from sample JSON: 
//  Generate Parsing Code from JSON

//  Get each of the claims..
ver := jsonClaims.StringOf('ver');
iss := jsonClaims.StringOf('iss');
s_sub := jsonClaims.StringOf('sub');
aud := jsonClaims.StringOf('aud');
exp := jsonClaims.IntOf('exp');
iat := jsonClaims.IntOf('iat');
nbf := jsonClaims.IntOf('nbf');
name := jsonClaims.StringOf('name');
preferred_username := jsonClaims.StringOf('preferred_username');
oid := jsonClaims.StringOf('oid');
tid := jsonClaims.StringOf('tid');
aio := jsonClaims.StringOf('aio');