(Unicode C) Wish for Merchants -- Get OAuth2 Access Token for Desktop App

Demonstrates how to get a Wish for Merchants OAuth2 access token from a desktop application or script.

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#include <C_CkOAuth2W.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkOAuth2W oauth2;
    BOOL success;
    const wchar_t *url;
    int numMsWaited;
    HCkStringBuilderW sbJson;

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

    // This example is for desktop applicatons (it is not for code that runs on a web server).
    // You'll need to add a line (or a few lines of code) to popup a web browser that navigates to a URL.
    // This is explained in the comments below.

    // 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 Wish OAuth2 Access Token.

    oauth2 = CkOAuth2W_Create();

    // Wish OAuth2 does not allow a localhost callback URI such as "http://localhost:<portNumber>/"
    // For a desktop app, you must provide a script on your web server to redirect to "http://localhost/<portNumber>"
    // It can be written in C#, PHP, or whatever desired.  It must include the query string in the redirection.
    // For example, in PHP your script would look like this:

    // <?php
    //   header( 'Location: http://localhost:3017?' . $_SERVER['QUERY_STRING'] );
    // ?>

    CkOAuth2W_putAppCallbackUrl(oauth2,L"https://yourwebserver.com/OAuth2.php");
    CkOAuth2W_putListenPort(oauth2,3017);

    CkOAuth2W_putAuthorizationEndpoint(oauth2,L"https://merchant.wish.com/v3/oauth/authorize");
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://merchant.wish.com/api/v3/oauth/access_token");

    CkOAuth2W_putUncommonOptions(oauth2,L"EXCHANGE_CODE_FOR_TOKEN_USING_GET");

    // Replace these with actual values.
    CkOAuth2W_putClientId(oauth2,L"WISH-CLIENT-ID");
    CkOAuth2W_putClientSecret(oauth2,L"WISH-CLIENT-SECRET");

    CkOAuth2W_putScope(oauth2,L"");

    // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
    url = CkOAuth2W_startAuth(oauth2);
    if (CkOAuth2W_getLastMethodSuccess(oauth2) != TRUE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

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

    // At this point, your application should load the URL in a browser.
    // For example, 
    // in C#: System.Diagnostics.Process.Start(url);
    // in Java: Desktop.getDesktop().browse(new URI(url));
    // in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
    //              wsh.Run url
    // in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
    // in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
    // The Wish account owner would interactively accept or deny the authorization request.

    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...

    // Now wait for the authorization.
    // We'll wait for a max of 60 seconds.
    numMsWaited = 0;
    while ((numMsWaited < 60000) && (CkOAuth2W_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2W_SleepMs(oauth2,100);
        numMsWaited = numMsWaited + 100;
    }

    // If there was no response from the browser within 60 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if (CkOAuth2W_getAuthFlowState(oauth2) < 3) {
        CkOAuth2W_Cancel(oauth2);
        wprintf(L"No response from the browser!\n");
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    if (CkOAuth2W_getAuthFlowState(oauth2) == 5) {
        wprintf(L"OAuth2 failed to complete.\n");
        wprintf(L"%s\n",CkOAuth2W_failureInfo(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) == 4) {
        wprintf(L"OAuth2 authorization was denied.\n");
        wprintf(L"%s\n",CkOAuth2W_accessTokenResponse(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) != 3) {
        wprintf(L"Unexpected AuthFlowState:%d\n",CkOAuth2W_getAuthFlowState(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // Save the full JSON access token response to a file.
    sbJson = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbJson,CkOAuth2W_accessTokenResponse(oauth2));
    CkStringBuilderW_WriteFile(sbJson,L"qa_data/tokens/wish.json",L"utf-8",FALSE);

    // The full JSON received looks like this:
    // {
    //   "message": "",
    //   "code": 0,
    //   "data": {
    //     "access_token": "15af1c191c1243b029bc1660b5c08ce7",
    //     "scopes": [
    //       "epc:read",
    //       "epc:write",
    //       "fbs:read",
    //       "fbs:write",
    //       "fbw:read",
    //       "fbw:write",
    //       "infractions:read",
    //       "infractions:write",
    //       "insurance:read",
    //       "insurance:write",
    //       "loans:read",
    //       "loans:write",
    //       "merchant:read",
    //       "merchant:write",
    //       "notifications:read",
    //       "notifications:write",
    //       "orders:read",
    //       "orders:write",
    //       "payments:read",
    //       "payments:write",
    //       "penalties:read",
    //       "penalties:write",
    //       "product_boost:read",
    //       "product_boost:write",
    //       "products:read",
    //       "products:write",
    //       "ratings:read",
    //       "ratings:write",
    //       "returns:read",
    //       "returns:write",
    //       "tickets:read",
    //       "tickets:write"
    //     ],
    //     "merchant_id": "5eb3f605178f5be2c784fa02",
    //     "expiry_time": "2020-12-17T16:55:09.594+00:00",
    //     "refresh_token": "55a38e44df674a1e859891624b2c4c23"
    //   }
    // }

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"Access Token = %s\n",CkOAuth2W_accessToken(oauth2));


    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);

    }