Unicode C++

Schwab OAuth2 in a Desktop App

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Demonstrates how to get a Charles Schwab OAuth2 access token from a desktop application or script. Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

    // To further clarify, see OAuth 2.0 Authorization Flow

    // This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
    // repeatedly refreshed without user interaction, as shown in this example: Refresh Schwab OAuth2 Access Token.

    CkOAuth2W oauth2;

    // Your applicaton must use your own public web server as an intermediate
    // to receive and forward the redirect to localhost.
    // See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

    oauth2.put_AppCallbackUrl(L"https://yourwebserver.com/OAuth2.php");
    oauth2.put_ListenPort(3017);

    oauth2.put_AuthorizationEndpoint(L"https://api.schwabapi.com/v1/oauth/authorize");
    oauth2.put_TokenEndpoint(L"https://api.schwabapi.com/v1/oauth/token");

    // Replace these with actual values.
    oauth2.put_ClientId(L"APP_KEY");
    oauth2.put_ClientSecret(L"APP_SECRET");
    oauth2.put_UseBasicAuth(true);
    oauth2.put_CodeChallenge(false);

    oauth2.put_Scope(L"");

    // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
    const wchar_t *url = oauth2.startAuth();
    if (oauth2.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",oauth2.lastErrorText());
        return;
    }

    wprintf(L"url = %s\n",url);

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success = oauth2.LaunchBrowser(url);
    if (success == false) {
        wprintf(L"%s\n",oauth2.lastErrorText());
        return;
    }

    // Wait for the user to approve or deny authorization in the browser.
    int numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited + 100;
    }

    // If the browser does not respond within the specified time, AuthFlowState will be:
    // 
    // 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
    // 2: Waiting for Final Response – The thread is awaiting the final access token response.
    // In either case, cancel the background task initiated by StartAuth.

    if (oauth2.get_AuthFlowState() < 3) {
        oauth2.Cancel();
        wprintf(L"No response from the browser!\n");
        return;
    }

    // Check AuthFlowState to determine if authorization was granted, denied, or failed:
    // 
    // 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
    // 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
    // 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

    if (oauth2.get_AuthFlowState() == 5) {
        wprintf(L"OAuth2 failed to complete.\n");
        wprintf(L"%s\n",oauth2.failureInfo());
        return;
    }

    if (oauth2.get_AuthFlowState() == 4) {
        wprintf(L"OAuth2 authorization was denied.\n");
        wprintf(L"%s\n",oauth2.accessTokenResponse());
        return;
    }

    if (oauth2.get_AuthFlowState() != 3) {
        wprintf(L"Unexpected AuthFlowState:%d\n",oauth2.get_AuthFlowState());
        return;
    }

    // Save the full JSON access token response to a file.
    CkStringBuilderW sbJson;
    sbJson.Append(oauth2.accessTokenResponse());
    sbJson.WriteFile(L"qa_data/tokens/schwab-access-token.json",L"utf-8",false);

    // The full JSON received looks like this:
    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

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