(Objective-C) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <CkoCert.h>
#import <CkoPrivateKey.h>
#import <CkoHttpResponse.h>
#import <CkoStringBuilder.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;

// The following JSON is sent in the request body.

// {
//   "grant_type": "client_credentials",
//   "client_id": 1234,
//   "client_secret": "23456abcde"
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"grant_type" value: @"client_credentials"];
[json UpdateInt: @"client_id" value: [NSNumber numberWithInt: 1234]];
[json UpdateString: @"client_secret" value: @"23456abcde"];

[http SetRequestHeader: @"Content-type" value: @"application/json"];

// Add the client certificate TLS authentication.
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadFromFile: @"qa_data/certs_and_keys/union_client_certificate.crt"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadAnyFormatFile: @"qa_data/certs_and_keys/union_client_certificate.nopass.key" password: @""];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

// Associate the private key with the cert.
// This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
success = [cert SetPrivateKey: privKey];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Tell HTTP to use the cert for client TLS certificate authentication.
success = [http SetSslClientCert: cert];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoHttpResponse *resp = [http PostJson3: @"https://api-test.rsap.ca/oauth/token" contentType: @"application/json" json: json];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

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

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

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");

    return;
}

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

// {
//   "token_type": "Bearer",
//   "expires_in": 3600,
//   "access_token": "eyJ0eXAi...LnE"
// }

// This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
// or it can simply get a new access token before each request (if you're not doing too many requests).
success = [jResp WriteFile: @"qa_data/tokens/rsapToken.json"];