Objective-C

Decode Microsoft Graph ID Token

See more Microsoft Graph Examples

Demonstrates how to decode a Microsoft Graph ID token. Objective-C

#import <CkoJsonObject.h>
#import <CkoJwt.h>
#import <NSString.h>

BOOL success = NO;

//  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"
//  }

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
success = [jsonToken LoadFile: @"qa_data/tokens/microsoftGraph.json"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load the JSON file...");
    return;
}

//  Use Chilkat's JWT API to examine the id_token..
CkoJwt *jwt = [[CkoJwt alloc] init];
NSString *idToken = [jsonToken StringOf: @"id_token"];

//  Extract the JOSE header..
NSString *jose = [jwt GetHeader: idToken];

CkoJsonObject *jsonHeader = [[CkoJsonObject alloc] init];
[jsonHeader Load: jose];
jsonHeader.EmitCompact = NO;
NSLog(@"%@",[jsonHeader Emit]);

//  The JOSE header looks like this:

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

NSString *claims = [jwt GetPayload: idToken];

CkoJsonObject *jsonClaims = [[CkoJsonObject alloc] init];
[jsonClaims Load: claims];
jsonClaims.EmitCompact = NO;
NSLog(@"%@",[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..
NSString *ver = [jsonClaims StringOf: @"ver"];
NSString *iss = [jsonClaims StringOf: @"iss"];
NSString *s_sub = [jsonClaims StringOf: @"sub"];
NSString *aud = [jsonClaims StringOf: @"aud"];
int exp = [[jsonClaims IntOf: @"exp"] intValue];
int iat = [[jsonClaims IntOf: @"iat"] intValue];
int nbf = [[jsonClaims IntOf: @"nbf"] intValue];
NSString *name = [jsonClaims StringOf: @"name"];
NSString *preferred_username = [jsonClaims StringOf: @"preferred_username"];
NSString *oid = [jsonClaims StringOf: @"oid"];
NSString *tid = [jsonClaims StringOf: @"tid"];
NSString *aio = [jsonClaims StringOf: @"aio"];