Xojo Plugin

Decode Microsoft Graph ID Token

See more Microsoft Graph Examples

Demonstrates how to decode a Microsoft Graph ID token. Xojo Plugin

Dim success As Boolean
success = False

//  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"
//  }

Dim jsonToken As New Chilkat.JsonObject
success = jsonToken.LoadFile("qa_data/tokens/microsoftGraph.json")
If (success = False) Then
    System.DebugLog("Failed to load the JSON file...")
    Return
End If

//  Use Chilkat's JWT API to examine the id_token..
Dim jwt As New Chilkat.Jwt
Dim idToken As String
idToken = jsonToken.StringOf("id_token")

//  Extract the JOSE header..
Dim jose As String
jose = jwt.GetHeader(idToken)

Dim jsonHeader As New Chilkat.JsonObject
success = jsonHeader.Load(jose)
jsonHeader.EmitCompact = False
System.DebugLog(jsonHeader.Emit())

//  The JOSE header looks like this:

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

Dim claims As String
claims = jwt.GetPayload(idToken)

Dim jsonClaims As New Chilkat.JsonObject
success = jsonClaims.Load(claims)
jsonClaims.EmitCompact = False
System.DebugLog(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..
Dim ver As String
ver = jsonClaims.StringOf("ver")
Dim iss As String
iss = jsonClaims.StringOf("iss")
Dim s_sub As String
s_sub = jsonClaims.StringOf("sub")
Dim aud As String
aud = jsonClaims.StringOf("aud")
Dim exp As Int32
exp = jsonClaims.IntOf("exp")
Dim iat As Int32
iat = jsonClaims.IntOf("iat")
Dim nbf As Int32
nbf = jsonClaims.IntOf("nbf")
Dim name As String
name = jsonClaims.StringOf("name")
Dim preferred_username As String
preferred_username = jsonClaims.StringOf("preferred_username")
Dim oid As String
oid = jsonClaims.StringOf("oid")
Dim tid As String
tid = jsonClaims.StringOf("tid")
Dim aio As String
aio = jsonClaims.StringOf("aio")