(Objective-C) Banco Inter OAuth2 Client Credentials

Generate an OAuth2 access token needed to consume the Inter APIs.

For more information, see https://developers.bancointer.com.br/reference/token-3

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

// First load the certificate and private key, and set as the HTTP object's client certificate.
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadFromFile: @"<nome arquivo certificado>.crt"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

CkoBinData *bdPrivKey = [[CkoBinData alloc] init];
success = [bdPrivKey LoadFile: @"<nome arquivo chave privada>.key"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load <nome");
    return;
}

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadAnyFormat: bdPrivKey password: @""];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

success = [cert SetPrivateKey: privKey];
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 = @"/oauth/v2/token";
req.ContentType = @"application/x-www-form-urlencoded";
[req AddParam: @"grant_type" value: @"client_credentials"];
// Requested scopes in OAuth2 are typically SPACE separated.
[req AddParam: @"scope" value: @"boleto-cobranca.read boleto-cobranca.write"];
[req AddHeader: @"accept" value: @"application/json"];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://cdpj.partners.bancointer.com.br/oauth/v2/token" req: req];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[resp GetBodyJson: jResp];
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;
}

success = [jResp WriteFile: @"qa_data/tokens/banco_inter_client_credentials.json"];
if (success == NO) {
    NSLog(@"%@",@"Failed to save JSON access token file.");
    return;
}

NSLog(@"%@",@"Success.");