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(MFC) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkOAuth2.h>
#include <CkRest.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    CkString strOut;

    bool success = true;

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

    //  This example uses a previously obtained access token having permission for the
    //  Google Drive scope.

    //  The access token (and refresh token) was previously saved to a JSON file with this format:
    //  See Get Google Drive OAuth2 Access Token

    //  {
    //    "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
    //    "expires_in": 3600,
    //    "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
    //    "scope": "https://www.googleapis.com/auth/drive",
    //    "token_type": "Bearer"
    //  }

    CkJsonObject json;
    const char *tokenFilePath = "qa_data/tokens/googleDrive.json";
    json.LoadFile(tokenFilePath);

    CkOAuth2 oauth2;
    oauth2.put_AccessToken(json.stringOf("access_token"));
    oauth2.put_RefreshToken(json.stringOf("refresh_token"));

    CkRest rest;

    //  Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    //  Provide the authentication credentials (i.e. the access token)
    rest.SetAuthOAuth2(oauth2);

    //  We'll test with a simple request to empty trash.
    //  If our access token expired, we'll get a 401 response..
    const char *jsonResponse = rest.fullRequestNoBody("DELETE","/drive/v3/files/trash");
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  If the access token expired, we'll get a 401 response status with this response body:
    //  {
    //   "error": {
    //    "errors": [
    //     {
    //      "domain": "global",
    //      "reason": "authError",
    //      "message": "Invalid Credentials",
    //      "locationType": "header",
    //      "location": "Authorization"
    //     }
    //    ],
    //    "code": 401,
    //    "message": "Invalid Credentials"
    //   }
    //  }
    if (rest.get_ResponseStatusCode() == 401) {

        strOut.append("Refreshing access token...");
        strOut.append("\r\n");

        oauth2.put_AuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth");
        oauth2.put_TokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

        //   Replace these with actual values.
        oauth2.put_ClientId("GOOGLE-CLIENT-ID");
        oauth2.put_ClientSecret("GOOGLE-CLIENT-SECRET");
        oauth2.put_Scope("https://www.googleapis.com/auth/drive");

        //  Use OAuth2 to refresh the access token.
        success = oauth2.RefreshAccessToken();
        if (success != true) {
            strOut.append(oauth2.lastErrorText());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        //  Save the new access token and refresh token to our XML file (so we can refresh it again when needed).
        json.UpdateString("access_token",oauth2.accessToken());
        json.UpdateString("refresh_token",oauth2.refreshToken());
        CkFileAccess fac;
        fac.WriteEntireTextFile(tokenFilePath,json.emit(),"utf-8",false);

        strOut.append("Access Token Refreshed!");
        strOut.append("\r\n");

        //  Retry the request with the new access token..
        jsonResponse = rest.fullRequestNoBody("DELETE","/drive/v3/files/trash");
        if (rest.get_LastMethodSuccess() != true) {
            strOut.append(rest.lastErrorText());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

    }

    //  A successful response will have a status code equal to 204 and the response body is empty.
    //  (If not successful, then there should be a JSON response body with information..)
    if (rest.get_ResponseStatusCode() != 204) {
        strOut.append("response status code = ");
        strOut.appendInt(rest.get_ResponseStatusCode());
        strOut.append("\r\n");
        strOut.append("response status text = ");
        strOut.append(rest.responseStatusText());
        strOut.append("\r\n");
        strOut.append("response header: ");
        strOut.append(rest.responseHeader());
        strOut.append("\r\n");
        strOut.append("response JSON: ");
        strOut.append(jsonResponse);
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Trash Emptied!");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

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