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 <C_CkJsonObject.h>
#include <C_CkDateTime.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttp.h>
#include <C_CkHttpResponse.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    HCkDateTime dtExpire;
    HCkHttpRequest req;
    HCkHttp http;
    HCkHttpResponse resp;
    HCkFileAccess fac;

    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.

    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/dynamicsCrm.json");
    if (success != TRUE) {
        CkJsonObject_Dispose(json);
        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.
    dtExpire = CkDateTime_Create();
    CkDateTime_SetFromUnixTime(dtExpire,FALSE,CkJsonObject_IntOf(json,"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...
    // 

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

    http = CkHttp_Create();

    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpReq(http,"https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token",req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkDateTime_Dispose(dtExpire);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Load the JSON response.
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    CkJsonObject_putEmitCompact(json,FALSE);

    // Show the JSON response.
    printf("%s\n",CkJsonObject_emit(json));

    printf("Response status code: %d\n",CkHttpResponse_getStatusCode(resp));

    // If the response status code is not 200, then it's an error.
    if (CkHttpResponse_getStatusCode(resp) != 200) {
        CkJsonObject_Dispose(json);
        CkDateTime_Dispose(dtExpire);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        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 (CkJsonObject_HasMember(json,"expires_on") != TRUE) {
        CkDateTime_SetFromCurrentSystemTime(dtExpire);
        CkDateTime_AddSeconds(dtExpire,CkJsonObject_IntOf(json,"expires_in"));
        CkJsonObject_AppendString(json,"expires_on",CkDateTime_getAsUnixTimeStr(dtExpire,FALSE));
    }

    // Save the refreshed access token JSON to a file for future requests.
    fac = CkFileAccess_Create();
    CkFileAccess_WriteEntireTextFile(fac,"qa_data/tokens/dynamicsCrm.json",CkJsonObject_emit(json),"utf-8",FALSE);


    CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dtExpire);
    CkHttpRequest_Dispose(req);
    CkHttp_Dispose(http);
    CkHttpResponse_Dispose(resp);
    CkFileAccess_Dispose(fac);

    }