(Objective-C) Isabel Connect Create Access Token given Valid Refresh Token

See more Ibanity Examples

Create (refresh) an access token given a valid refresh token.

For more information, see https://documentation.ibanity.com/isabel-connect/api#create-access-token

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#import <CkoHttp.h>
#import <CkoCert.h>
#import <CkoHttpRequest.h>
#import <CkoJsonObject.h>
#import <CkoCrypt2.h>
#import <NSString.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];

// Implements the following CURL command:

// curl -X POST https://api.ibanity.com/isabel-connect/oauth2/token \
// --cert certificate.pem:qwertyuiop1 \
// --key private_key.pem  \
// -H "Content-Type: application/x-www-form-urlencoded" \
// -H "Accept: application/vnd.api+json" \
// -H "Ibanity-Idempotency-Key: 94c5586e-e15e-4bae-a1fe-fdbefe1f11d3"  \
// -d grant_type=refresh_token \
// -d refresh_token=valid_refresh_token \
// -d client_id=valid_client_id \
// -d client_secret=valid_client_secret

// Ibanity provides the certificate + private key in PFX format.  This example will use the .pfx instead of the pair of PEM files.
// (It is also possible to implement using Chilkat with the PEM files, but PFX is easier.)
CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadPfxFile: @"qa_data/pfx/my_ibanity_certificate.pfx" password: @"my_pfx_password"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

success = [http SetSslClientCert: cert];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
req.HttpVerb = @"POST";
req.Path = @"/isabel-connect/oauth2/token";
req.ContentType = @"application/x-www-form-urlencoded";
[req AddParam: @"grant_type" value: @"refresh_token"];

// Load the previously obtained refresh token.
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
success = [jsonToken LoadFile: @"qa_data/tokens/isabel_refresh_token.json"];
if (success == NO) {
    NSLog(@"%@",@"No existing access token.");
    return;
}

[req AddParam: @"refresh_token" value: [jsonToken StringOf: @"refresh_token"]];

// Note: For sandbox testing, we literally want to use the strings
// "valid_client_id", and "valid_client_secret".
// For the live app, you would replace these with actual values.
[req AddParam: @"client_id" value: @"valid_client_id"];
[req AddParam: @"client_secret" value: @"valid_client_secret"];

[req AddHeader: @"Accept" value: @"application/vnd.api+json"];

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
NSString *idempotencyKey = [crypt GenerateUuid];
NSLog(@"%@%@",@"Ibanity-Idempotency-Key: ",idempotencyKey);
[req AddHeader: @"Ibanity-Idempotency-Key" value: idempotencyKey];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://api.ibanity.com/isabel-connect/oauth2/token" req: req];
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)

// Notice that we don't get a new refresh token.  The original refresh token is used each time we
// want to refresh.  However, we get a new access token.  This access token is to be used in Isabel API calls
// until we need to refresh again.
// {
//   "token_type": "Bearer",
//   "scope": "cloudconnect",
//   "expires_in": 1799,
//   "access_token": "access_token_1603365408"
// }

// 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 *token_type = [jResp StringOf: @"token_type"];
NSString *scope = [jResp StringOf: @"scope"];
int expires_in = [[jResp IntOf: @"expires_in"] intValue];
NSString *access_token = [jResp StringOf: @"access_token"];

// Save this to a file so we can load in other examples to include the access token in the HTTP request.
success = [jResp WriteFile: @"qa_data/tokens/isabel_access_token.json"];