(MFC) Check PayPal Access Token Expiration

Checks to see if the PayPal access token expired.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkDateTime.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // Note: Requires Chilkat v9.5.0.64 or greater.

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

    // In the example linked here: PayPal OAuth2 Token,
    // we fetched a PayPal access token and saved it to a JSON file.
    // We also recorded the current date/time.
    // Load this JSON file and compare the current date/time with the fetch date/time
    // and the "expires_in" value to see if the token is expired.

    CkJsonObject json;
    bool success = json.LoadFile("qa_data/tokens/paypal.json");
    if (success != true) {
        strOut.append("Failed to load access key json file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the current date/time.
    CkDateTime dateTime;
    bool bLocalTime = false;
    int dtNow = dateTime.GetAsUnixTime(bLocalTime);

    // Get the access token create date/time
    int dtCreate = json.IntOf("tokenCreateTimeUtc");

    // Find out how many seconds have elapsed.
    int numSeconds = dtNow - dtCreate;

    // Get the expires_in value from the JSON.
    int expires_in = json.IntOf("expires_in");

    strOut.append("token age (in seconds) = ");
    strOut.appendInt(numSeconds);
    strOut.append("\r\n");
    strOut.append("expires_in = ");
    strOut.appendInt(expires_in);
    strOut.append("\r\n");

    // If the token expired, or if it will expire in 5 minutes or less,
    // get another token.
    if (numSeconds < (expires_in - 300)) {
        strOut.append("The token is not yet expired.  No need to fetch another.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Time to fetch a new access token...");
    strOut.append("\r\n");

    // Get another token..
    // See the example at Get PayPal OAuth2 Token
    // to get another token..


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }