(Visual FoxPro) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loOauth2
LOCAL lnSuccess
LOCAL lcUrl
LOCAL lnNumMsWaited
LOCAL loSbJson

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2 = CreateObject('Chilkat.OAuth2')

* 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'] );
* ?>

loOauth2.AppCallbackUrl = "https://yourwebserver.com/OAuth2.php"
loOauth2.ListenPort = 3017

loOauth2.AuthorizationEndpoint = "https://merchant.wish.com/v3/oauth/authorize"
loOauth2.TokenEndpoint = "https://merchant.wish.com/api/v3/oauth/access_token"

loOauth2.UncommonOptions = "EXCHANGE_CODE_FOR_TOKEN_USING_GET"

* Replace these with actual values.
loOauth2.ClientId = "WISH-CLIENT-ID"
loOauth2.ClientSecret = "WISH-CLIENT-SECRET"

loOauth2.Scope = ""

* Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
lcUrl = loOauth2.StartAuth()
IF (loOauth2.LastMethodSuccess <> 1) THEN
    ? loOauth2.LastErrorText
    RELEASE loOauth2
    CANCEL
ENDIF

? "url = " + lcUrl

* 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.
lnNumMsWaited = 0
DO WHILE (lnNumMsWaited < 60000) AND (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 100
ENDDO

* 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 (loOauth2.AuthFlowState < 3) THEN
    loOauth2.Cancel()
    ? "No response from the browser!"
    RELEASE loOauth2
    CANCEL
ENDIF

* 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 (loOauth2.AuthFlowState = 5) THEN
    ? "OAuth2 failed to complete."
    ? loOauth2.FailureInfo
    RELEASE loOauth2
    CANCEL
ENDIF

IF (loOauth2.AuthFlowState = 4) THEN
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    RELEASE loOauth2
    CANCEL
ENDIF

IF (loOauth2.AuthFlowState <> 3) THEN
    ? "Unexpected AuthFlowState:" + STR(loOauth2.AuthFlowState)
    RELEASE loOauth2
    CANCEL
ENDIF

* Save the full JSON access token response to a file.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJson = CreateObject('Chilkat.StringBuilder')
loSbJson.Append(loOauth2.AccessTokenResponse)
loSbJson.WriteFile("qa_data/tokens/wish.json","utf-8",0)

* 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"
*   }
* }

? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken

RELEASE loOauth2
RELEASE loSbJson