(Unicode C) Banco Inter OAuth2 Client Credentials

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

Note: This example requires Chilkat v11.0.0 or greater.

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

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#include <C_CkHttpW.h>
#include <C_CkCertW.h>
#include <C_CkBinDataW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpW http;
    HCkCertW cert;
    HCkBinDataW bdPrivKey;
    HCkPrivateKeyW privKey;
    HCkHttpRequestW req;
    HCkHttpResponseW resp;
    HCkJsonObjectW jResp;
    int respStatusCode;

    success = FALSE;

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

    http = CkHttpW_Create();

    // First load the certificate and private key, and set as the HTTP object's client certificate.
    cert = CkCertW_Create();
    success = CkCertW_LoadFromFile(cert,L"<nome arquivo certificado>.crt");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        return;
    }

    bdPrivKey = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bdPrivKey,L"<nome arquivo chave privada>.key");
    if (success == FALSE) {
        wprintf(L"Failed to load <nome\n");
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        return;
    }

    privKey = CkPrivateKeyW_Create();
    success = CkPrivateKeyW_LoadAnyFormat(privKey,bdPrivKey,L"");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey));
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    success = CkCertW_SetPrivateKey(cert,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    success = CkHttpW_SetSslClientCert(http,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    req = CkHttpRequestW_Create();
    CkHttpRequestW_putHttpVerb(req,L"POST");
    CkHttpRequestW_putPath(req,L"/oauth/v2/token");
    CkHttpRequestW_putContentType(req,L"application/x-www-form-urlencoded");
    CkHttpRequestW_AddParam(req,L"grant_type",L"client_credentials");
    // Requested scopes in OAuth2 are typically SPACE separated.
    CkHttpRequestW_AddParam(req,L"scope",L"boleto-cobranca.read boleto-cobranca.write");
    CkHttpRequestW_AddHeader(req,L"accept",L"application/json");

    resp = CkHttpResponseW_Create();
    success = CkHttpW_HttpReq(http,L"https://cdpj.partners.bancointer.com.br/oauth/v2/token",req,resp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    jResp = CkJsonObjectW_Create();
    CkHttpResponseW_GetBodyJson(resp,jResp);
    CkJsonObjectW_putEmitCompact(jResp,FALSE);

    wprintf(L"Response Body:\n");
    wprintf(L"%s\n",CkJsonObjectW_emit(jResp));

    respStatusCode = CkHttpResponseW_getStatusCode(resp);
    wprintf(L"Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",CkHttpResponseW_header(resp));
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkJsonObjectW_Dispose(jResp);
        return;
    }

    success = CkJsonObjectW_WriteFile(jResp,L"qa_data/tokens/banco_inter_client_credentials.json");
    if (success == FALSE) {
        wprintf(L"Failed to save JSON access token file.\n");
        CkHttpW_Dispose(http);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bdPrivKey);
        CkPrivateKeyW_Dispose(privKey);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkJsonObjectW_Dispose(jResp);
        return;
    }

    wprintf(L"Success.\n");


    CkHttpW_Dispose(http);
    CkCertW_Dispose(cert);
    CkBinDataW_Dispose(bdPrivKey);
    CkPrivateKeyW_Dispose(privKey);
    CkHttpRequestW_Dispose(req);
    CkHttpResponseW_Dispose(resp);
    CkJsonObjectW_Dispose(jResp);

    }