(C) Okta: Refresh Access Token with the Auth Code Flow

Demonstrates how to refresh a token that was obtained using the authorization code flow.

For more information, see https://developer.okta.com/docs/guides/implement-auth-code-pkce/use-flow/

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#include <C_CkJsonObject.h>
#include <C_CkOAuth2.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkOAuth2 oauth2;
    HCkStringBuilder sbJson;

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

    // See Get Okta Access Token using Authorization Code Flow with PKCE 
    // for sample code showing how to obtain an Okta access token using the authorization code flow for native apps (with PKCE).

    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/okta.json");
    if (success != TRUE) {
        printf("Failed to load myob.json\n");
        CkJsonObject_Dispose(jsonToken);
        return;
    }

    oauth2 = CkOAuth2_Create();

    CkOAuth2_putTokenEndpoint(oauth2,"https://{yourOktaDomain}/oauth2/default/v1/token");

    // Replace these with actual values.
    CkOAuth2_putClientId(oauth2,"OKTA_CLIENT_ID");
    CkOAuth2_putClientSecret(oauth2,"OKTA_CLIENT_SECRET");

    // Get the "refresh_token"
    CkOAuth2_putRefreshToken(oauth2,CkJsonObject_stringOf(jsonToken,"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    CkOAuth2_putVerboseLogging(oauth2,TRUE);
    success = CkOAuth2_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkJsonObject_Dispose(jsonToken);
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // Load the access token response into the json object 
    CkJsonObject_Load(jsonToken,CkOAuth2_accessTokenResponse(oauth2));

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    sbJson = CkStringBuilder_Create();
    CkJsonObject_putEmitCompact(jsonToken,FALSE);
    CkJsonObject_EmitSb(jsonToken,sbJson);
    CkStringBuilder_WriteFile(sbJson,"qa_data/tokens/okta.json","utf-8",FALSE);

    printf("OAuth2 authorization granted!\n");
    printf("New Access Token = %s\n",CkOAuth2_accessToken(oauth2));


    CkJsonObject_Dispose(jsonToken);
    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);

    }