(Objective-C) Retrieve the Okta JSON Web Keys (JWK)

Demonstrates how to get the Okta web keys (JWK) that will be needed to locally validate an access token. This example is for the case where Okta is the identity platform for your App or API. (See https://developer.okta.com/docs/reference/api/oidc/#composing-your-base-url)

Note: This example uses the URL

https://dev-765951.okta.com/oauth2/${authServerId}/v1/authorize

If you have a developer account, you can use the default authorization server that was created along with your account, in which case the full URL looks like this:

https://dev-765951.okta.com/oauth2/default/v1/authorize

Also: You'll need to change "dev-765951" to use your own Okta domain.

For more information, see https://developer.okta.com/docs/reference/api/oidc/#keys

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>
#import <NSString.h>

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

CkoHttp *http = [[CkoHttp alloc] init];
BOOL success;

// Implements the following CURL command:

// curl -X GET \
// https://dev-765951.okta.com/oauth2/${authServerId}/v1/keys?client_id=$my_client_id

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://dev-765951.okta.com/oauth2/${authServerId}/v1/keys?client_id=$my_client_id" sbContent: sbResponseBody];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[jResp LoadSb: sbResponseBody];
jResp.EmitCompact = NO;

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",[jResp Emit]);

int respStatusCode = [http.LastStatus intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",http.LastHeader);
    NSLog(@"%@",@"Failed.");
    return;
}

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "keys": [
//     {
//       "kty": "RSA",
//       "alg": "RS256",
//       "kid": "anSaRDPfWGOSCVNZEIZB9quCbNsdsvl5uWGBzxbudWQ",
//       "use": "sig",
//       "e": "AQAB",
//       "n": "jT8uAgd5wF7d3aiCjdxbVXk7EDio2ScqAjWCL2LXbY3bpj6RV4dswZTqBg0-vuIh1SBqjoufDV3fHAJcewv2dfEdfUKawBxTIcLgeSu_NoUsZ6zmHqYKC9U0awgP3s5_Yqcr7YMxurrPRNRdKNsFFF2lhCDJ-4gCO4CWiCUdptlmMfI7_pBxx9bgh1F-ulVKt_RUo-4A7tXwwJhBhWaECKoye04BACccSNkth8flGSvjXNIVKcAMHYQ3oDfB6U5zXcFuDVEBJI__hzA9920QRXrloIv_G0QmYgbaf4iRpd-3B6-PQ4-VK-FGm3t9eTwoFv6CARpyXrjaOeuLB1HaVw"
//     }
//   ]
// }

// Sample code for parsing the JSON response...
// Use the following online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

NSString *kty = 0;
NSString *alg = 0;
NSString *kid = 0;
NSString *use = 0;
NSString *e = 0;
NSString *n = 0;

int i = 0;
int count_i = [[jResp SizeOfArray: @"keys"] intValue];
while (i < count_i) {
    jResp.I = [NSNumber numberWithInt: i];
    kty = [jResp StringOf: @"keys[i].kty"];
    alg = [jResp StringOf: @"keys[i].alg"];
    kid = [jResp StringOf: @"keys[i].kid"];
    use = [jResp StringOf: @"keys[i].use"];
    e = [jResp StringOf: @"keys[i].e"];
    n = [jResp StringOf: @"keys[i].n"];
    i = i + 1;
}