(Objective-C) Azure Key Vault Get the Latest Version of a Certificate

See more Azure Key Vault Examples

Demonstrates how to get the latest version of a certificate in Azure Key Vault.

Note: This example requires Chilkat v9.5.0.96 or later.

For more information, see https://learn.microsoft.com/en-us/rest/api/keyvault/certificates/get-certificate/get-certificate?tabs=HTTP

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

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

// See Azure Key Vault Get Certificates for a more detailed explanation
// for how Chilkat is automatically getting the OAuth2 access token for your application.

BOOL success;

// Provide information needed for Chilkat to automatically get an OAuth2 access token as needed.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"client_id" value: @"APP_ID"];
[json UpdateString: @"client_secret" value: @"APP_PASSWORD"];
[json UpdateString: @"resource" value: @"https://vault.azure.net"];
[json UpdateString: @"token_endpoint" value: @"https://login.microsoftonline.com/TENANT_ID/oauth2/token"];

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

// Instead of providing an actual access token, we give Chilkat the information that allows it to 
// automatically fetch the access token using the OAuth2 client credentials flow.
http.AuthToken = [json Emit];

// Replace VAULT_NAME with the name of your Azure Key Vault.
[http SetUrlVar: @"certName" value: @"importCert01"];

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://VAULT_NAME.vault.azure.net/certificates/{$certName}?api-version=7.4" sbContent: sbResponse];
if (success == NO) {

    int statusCode = [http.LastStatus intValue];
    if (statusCode == 0) {
        // We did not get a response from the server..
        NSLog(@"%@",http.LastErrorText);
    }
    else {
        // We received a response, but it was an error.
        NSLog(@"%@%d",@"Error response status code: ",statusCode);
        NSLog(@"%@",@"Error response:");
        NSLog(@"%@",[sbResponse GetAsString]);
    }

    return;
}

CkoJsonObject *jsonResp = [[CkoJsonObject alloc] init];
[jsonResp LoadSb: sbResponse];
jsonResp.EmitCompact = NO;

NSLog(@"%@",[jsonResp Emit]);

// A sample JSON response is show at the bottom.

// Let's do two things with the result.
// 1) Load the DER of the cert into a Chilkat Cert object.
// 2) Get the Key Vault version id of the certificate.

CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadFromBase64: [jsonResp StringOf: @"cer"]];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    NSLog(@"%@",@"Failed to load certificate from Base64 DER.");
    return;
}

// The Azure Key Vault's "version" of the certificate is the hex string at the end of the "id", "kid", and "sid" JSON members.
// For example:  "7140c8755ed14839b5d86a9f7e7f0497"
CkoStringBuilder *sbId = [[CkoStringBuilder alloc] init];
[sbId Append: [jsonResp StringOf: @"id"]];
NSString *certVersion = [sbId GetAfterFinal: @"/" removeFlag: NO];
NSLog(@"%@%@",@"The key vault cert version is ",certVersion);

// {
//   "id": "https://kvchilkat.vault.azure.net/certificates/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//   "kid": "https://kvchilkat.vault.azure.net/keys/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//   "sid": "https://kvchilkat.vault.azure.net/secrets/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//   "x5t": "I_e3776K5Q_6PN1HHvJoI2ZGQRQ",
//   "cer": "MIIGXjCCB .... cjTsi7yIY=",
//   "attributes": {
//     "enabled": true,
//     "nbf": 1633996800,
//     "exp": 1728691199,
//     "created": 1697411128,
//     "updated": 1697411128,
//     "recoveryLevel": "CustomizedRecoverable+Purgeable",
//     "recoverableDays": 7
//   },
//   "policy": {
//     "id": "https://kvchilkat.vault.azure.net/certificates/importCert01/policy",
//     "key_props": {
//       "exportable": true,
//       "kty": "RSA",
//       "key_size": 4096,
//       "reuse_key": false
//     },
//     "secret_props": {
//       "contentType": "application/x-pkcs12"
//     },
//     "x509_props": {
//       "subject": "CN=\"Chilkat Software, Inc.\", O=\"Chilkat Software, Inc.\", S=Illinois, C=US",
//       "ekus": [
//         "1.3.6.1.5.5.7.3.3"
//       ],
//       "key_usage": [
//         "digitalSignature"
//       ],
//       "validity_months": 37,
//       "basic_constraints": {
//         "ca": false
//       }
//     },
//     "lifetime_actions": [
//       {
//         "trigger": {
//           "lifetime_percentage": 80
//         },
//         "action": {
//           "action_type": "EmailContacts"
//         }
//       }
//     ],
//     "issuer": {
//       "name": "Unknown"
//     },
//     "attributes": {
//       "enabled": true,
//       "created": 1697411128,
//       "updated": 1697411128
//     }
//   }
// }