(Unicode C) Okta Client Credentials FLow

The Client Credentials flow is recommended for use in machine-to-machine authentication. Your application will need to securely store its Client ID and Secret and pass those to Okta in exchange for an access token. At a high-level, the flow only has two steps:

• Your application passes its client credentials to your Okta authorization server.
• If the credentials are accurate, Okta responds with an access token.

Note: This example uses "customScope". You'll replace it with whatever scope(s) you've defined for your app. Scopes are defined in your Authorization Server. See Okta Authorization Server / Scopes

For more information, see https://developer.okta.com/docs/guides/implement-client-creds/use-flow/

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#include <C_CkHttpW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkHttpW http;
    BOOL success;
    HCkHttpRequestW req;
    HCkHttpResponseW resp;
    HCkStringBuilderW sbResponseBody;
    HCkJsonObjectW jResp;
    int respStatusCode;
    const wchar_t *access_token;
    const wchar_t *token_type;
    int expires_in;
    const wchar_t *scope;

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

    http = CkHttpW_Create();

    // Implements the following CURL command:

    // curl --request POST \
    //   --url https://{yourOktaDomain}/oauth2/default/v1/token \
    //   --header 'accept: application/json' \
    //   --user "client_id:client_secret" \
    //   --header 'cache-control: no-cache' \
    //   --header 'content-type: application/x-www-form-urlencoded' \
    //   --data 'grant_type=client_credentials&scope=customScope'

    CkHttpW_putLogin(http,L"client_id");
    CkHttpW_putPassword(http,L"client_secret");

    req = CkHttpRequestW_Create();
    CkHttpRequestW_putHttpVerb(req,L"POST");
    CkHttpRequestW_putPath(req,L"/oauth2/default/v1/token");
    CkHttpRequestW_putContentType(req,L"application/x-www-form-urlencoded");
    CkHttpRequestW_AddParam(req,L"grant_type",L"client_credentials");
    CkHttpRequestW_AddParam(req,L"scope",L"customScope");

    CkHttpRequestW_AddHeader(req,L"accept",L"application/json");

    resp = CkHttpW_PostUrlEncoded(http,L"https://{yourOktaDomain}/oauth2/default/v1/token",req);
    if (CkHttpW_getLastMethodSuccess(http) == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        return;
    }

    sbResponseBody = CkStringBuilderW_Create();
    CkHttpResponseW_GetBodySb(resp,sbResponseBody);
    jResp = CkJsonObjectW_Create();
    CkJsonObjectW_LoadSb(jResp,sbResponseBody);
    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");
        CkHttpResponseW_Dispose(resp);
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkStringBuilderW_Dispose(sbResponseBody);
        CkJsonObjectW_Dispose(jResp);
        return;
    }

    CkHttpResponseW_Dispose(resp);

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

    // {
    //   "access_token": "eyJraWQiO ... B2CnCLj7GRUW3mQ",
    //   "token_type": "Bearer",
    //   "expires_in": 3600,
    //   "scope": "customScope"
    // }

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    access_token = CkJsonObjectW_stringOf(jResp,L"access_token");
    token_type = CkJsonObjectW_stringOf(jResp,L"token_type");
    expires_in = CkJsonObjectW_IntOf(jResp,L"expires_in");
    scope = CkJsonObjectW_stringOf(jResp,L"scope");


    CkHttpW_Dispose(http);
    CkHttpRequestW_Dispose(req);
    CkStringBuilderW_Dispose(sbResponseBody);
    CkJsonObjectW_Dispose(jResp);

    }