(Unicode C++) X.com OAuth 2.0 Refresh Access Token

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Note: This example requires Chilkat v10.1.2 or greater.

For more information, see https://docs.x.com/resources/fundamentals/authentication/oauth-2-0/authorization-code

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#include <CkJsonObjectW.h>
#include <CkOAuth2W.h>
#include <CkDateTimeW.h>
#include <CkStringBuilderW.h>

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

    CkJsonObjectW jsonToken;
    bool success = jsonToken.LoadFile(L"qa_data/tokens/x.json");
    if (success != true) {
        wprintf(L"Failed to load x.json\n");
        return;
    }

    // The access token JSON looks something like this:

    // {
    //   "token_type": "bearer",
    //   "expires_in": 7200,
    //   "access_token": "VmNDLVZiYUZwejY5Mkx3RblFTmo3ek1leTRGclMuZFVOUTVUTWpNbVZKb1N5OjE3NDAxNjk4MDVxNTE6MToxOaF0OjE",
    //   "scope": "block.read follows.read offline.access tweet.write block.write like.write like.read users.read tweet.read follows.write",
    //   "refresh_token": "eThOWVVFSTRqdVp3QTFndGsxM2ZGZmFyNWVrU0phM1JKbGdrbGNWRGJzb1loOjE3NDAwMjk4MDUxNTI6MTowOnJ0OjE"
    // }

    CkOAuth2W oauth2;

    oauth2.put_TokenEndpoint(L"https://api.x.com/2/oauth2/token");

    // Replace this with your actual X.com OAuth2 Client ID and Client Secret
    oauth2.put_ClientId(L"OAUTH2_CLIENT_ID");
    oauth2.put_ClientSecret(L"OAUTH2_CLIENT_SECRET");

    // Get the "refresh_token"
    oauth2.put_RefreshToken(jsonToken.stringOf(L"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken();
    if (success != true) {
        wprintf(L"%s\n",oauth2.lastErrorText());
        return;
    }

    // Load the access token response into the json object 
    jsonToken.Load(oauth2.accessTokenResponse());

    // 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 (jsonToken.HasMember(L"expires_on") == false) {
        CkDateTimeW dtExpire;
        dtExpire.SetFromCurrentSystemTime();
        dtExpire.AddSeconds(jsonToken.IntOf(L"expires_in"));
        jsonToken.AppendString(L"expires_on",dtExpire.getAsUnixTimeStr(false));
    }

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    CkStringBuilderW sbJson;
    jsonToken.put_EmitCompact(false);
    jsonToken.EmitSb(sbJson);
    sbJson.WriteFile(L"qa_data/tokens/x.json",L"utf-8",false);

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"New Access Token = %s\n",oauth2.accessToken());
    }