(C++) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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#include <CkJsonObject.h>
#include <CkRest.h>

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

    // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
    // and saved in a JSON file.  

    // First get our previously obtained refresh token.
    // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
    CkJsonObject jsonToken;
    bool success = jsonToken.LoadFile("qa_data/tokens/geoop.json");

    CkRest rest;

    // Connect to GeoOp...
    bool bAutoReconnect = true;
    success = rest.Connect("login.geoop.com",443,true,bAutoReconnect);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Set the X-Version header.
    rest.AddHeader("X-Version","1.0");

    // Provide the required form params to get the new access token
    std::cout << "refresh_token = " << jsonToken.stringOf("refresh_token") << "\r\n";
    rest.AddQueryParam("refresh_token",jsonToken.stringOf("refresh_token"));
    rest.AddQueryParam("grant_type","refresh_token");
    rest.AddQueryParam("client_id","GEOOP-CLIENT-ID");
    rest.AddQueryParam("client_secret","GEOOP-CLIENT-SECRET");

    const char *responseBody = rest.fullRequestFormUrlEncoded("POST","/oauth2/token");
    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // If the response status code did not indicate success, then see what happened..
    if (rest.get_ResponseStatusCode() != 200) {
        std::cout << "Request Header: " << "\r\n";
        std::cout << rest.lastRequestHeader() << "\r\n";
        std::cout << "----" << "\r\n";
        std::cout << "Response StatusCode = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "Response StatusLine: " << rest.responseStatusText() << "\r\n";
        std::cout << "Response Header:" << "\r\n";
        std::cout << rest.responseHeader() << "\r\n";
        std::cout << responseBody << "\r\n";
        return;
    }

    CkJsonObject json;
    json.put_EmitCompact(false);
    json.Load(responseBody);

    // Show the full JSON response.  It should contain the new access token...
    std::cout << json.emit() << "\r\n";
    }