C++

Refresh a Dynamics CRM OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to refresh an expiring Dynamics CRM access token using the refresh token. endpoint.

(If a REST API call fails with a 401 unauthorized error, an application can auto-recover by refreshing the access token, and then re-send the request using the new token.)

C++

#include <CkJsonObject.h>
#include <CkDateTime.h>
#include <CkHttpRequest.h>
#include <CkHttp.h>
#include <CkHttpResponse.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get Dynamics CRM OAuth2 Access Token

    // This example will examine the JSON and expiration date, and if near expiration will
    // refresh the access token.

    CkJsonObject json;
    success = json.LoadFile("qa_data/tokens/dynamicsCrm.json");
    if (success != true) {
        return;
    }

    // The contents of the JSON look like this:
    // {
    //   "token_type": "Bearer",
    //   "scope": "user_impersonation",
    //   "expires_in": "3599",
    //   "ext_expires_in": "0",
    //   "expires_on": "1524783438",
    //   "not_before": "1524779538",
    //   "resource": "https://mydomain.api.crm.dynamics.com",
    //   "access_token": "...",
    //   "refresh_token": "...",
    //   "id_token": "..."
    // }

    // The "expires_on" value is a Unix time.
    CkDateTime dtExpire;
    dtExpire.SetFromUnixTime(false,json.IntOf("expires_on"));

    // If this date/time expires within 10 minutes of the current system time, refresh the token.

    // OK, we need to refresh the access token by sending a POST...
    // 

    CkHttpRequest req;
    req.AddParam("grant_type","refresh_token");
    req.AddParam("redirect_uri","http://localhost:3017/");
    req.AddParam("client_id","DYNAMICS-CRM-CLIENT-ID");
    req.AddParam("client_secret","DYNAMICS-CRM-SECRET-KEY");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));
    req.AddParam("resource","https://mydynamicsdomain.api.crm.dynamics.com");

    CkHttp http;

    req.put_HttpVerb("POST");
    req.put_ContentType("application/x-www-form-urlencoded");

    CkHttpResponse resp;
    success = http.HttpReq("https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token",req,resp);
    if (success == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // Load the JSON response.
    json.Load(resp.bodyStr());
    json.put_EmitCompact(false);

    // Show the JSON response.
    std::cout << json.emit() << "\r\n";

    std::cout << "Response status code: " << resp.get_StatusCode() << "\r\n";

    // If the response status code is not 200, then it's an error.
    if (resp.get_StatusCode() != 200) {
        return;
    }

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if (json.HasMember("expires_on") != true) {
        dtExpire.SetFromCurrentSystemTime();
        dtExpire.AddSeconds(json.IntOf("expires_in"));
        json.AppendString("expires_on",dtExpire.getAsUnixTimeStr(false));
    }

    // Save the refreshed access token JSON to a file for future requests.
    CkFileAccess fac;
    fac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",json.emit(),"utf-8",false);
    }