(Unicode C++) Get a Xero OAuth2 Access Token

Gets a Xero OAuth2 access token.

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

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

void ChilkatSample(void)
    {
    // For more information about the OAuth2, see OAuth 2.0 Authorization Flow

    CkOAuth2W oauth2;

    // For Xero OAuth2, set the listen port equal to the port used
    // in the Authorized Redirect URL for the Client ID.
    // For example, in this case the Authorized Redirect URL would be http://localhost:55568/
    // Your app should choose a port not likely not used by any other application.
    // See Xero OAuth2 for Desktop Apps for more information.
    oauth2.put_ListenPort(55568);

    oauth2.put_AuthorizationEndpoint(L"https://login.xero.com/identity/connect/authorize");
    oauth2.put_TokenEndpoint(L"https://identity.xero.com/connect/token");

    // Replace these with actual values.
    oauth2.put_ClientId(L"XERO_APP_OAUTH2_CLIENT_ID");
    oauth2.put_ClientSecret(L"XERO_APP_OAUTH2_CLIENT_SECRET");
    oauth2.put_UseBasicAuth(true);

    // See https://developer.xero.com/documentation/oauth2/scopes for a complete list of scopes.
    // You will need to change the scopes depending on what access is needed..
    oauth2.put_Scope(L"openid profile email accounting.transactions accounting.attachments accounting.settings payroll.employees offline_access");

    // 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() != true) {
        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.
    bool 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/xero-access-token.json",L"utf-8",false);

    // The saved JSON response looks like this:

    // 	{
    // 	 "access_token": "...",
    // 	 "token_type": "Bearer",
    // 	 "expires_in": 3600,
    // 	 "refresh_token": "..."
    // 	}
    // 
    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"Access Token = %s\n",oauth2.accessToken());
    }