(Perl) Decode Microsoft Graph ID Token

Demonstrates how to decode a Microsoft Graph ID token.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

# In a previous example, we obtained a Microsoft Graph OAuth2 access token.
# This example loads the JSON saved from the previous example and decodes the id_token.

# 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 = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/microsoftGraph.json");
if ($success == 0) {
    print "Failed to load the JSON file..." . "\r\n";
    exit;
}

# Use Chilkat's JWT API to examine the id_token..
$jwt = chilkat::CkJwt->new();
$idToken = $jsonToken->stringOf("id_token");

# Extract the JOSE header..
$jose = $jwt->getHeader($idToken);

$jsonHeader = chilkat::CkJsonObject->new();
$jsonHeader->Load($jose);
$jsonHeader->put_EmitCompact(0);
print $jsonHeader->emit() . "\r\n";

# The JOSE header looks like this:

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

$claims = $jwt->getPayload($idToken);

$jsonClaims = chilkat::CkJsonObject->new();
$jsonClaims->Load($claims);
$jsonClaims->put_EmitCompact(0);
print $jsonClaims->emit() . "\r\n";

# 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");