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(VBScript) Get Ebay OAuth2 in a Desktop App

Demonstrates how to get a Ebay OAuth2 access token from a desktop application or script.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

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

set oauth2 = CreateObject("Chilkat_9_5_0.OAuth2")

' See the Ebay documentation about Access token types
' Also see the Ebay documentation about authorization code grant flow

' Ebay OAuth2 only allows for SSL/TLS with localhost redirect URLs (i.e. https://localhost:<portNumber>/)
' 
' We want the access token to come back to your desktop app, but without TLS (the redirect from your local browser to 
' your application does not traverse a network (both are on localhost), and therefore no TLS is necessary).
' To get around the https problem, you'll need to script
' on your web server to respond with it's own redirect.  Think of it this way:  If Ebay won't redirect to http://localhost:<portNumber>,
' then just setup a web server script that will send a redirect response to http://localhost:<portNumber>

' This script 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'] );
' ?>

' Ebay is odd in that it wants the redirect URL indirectly.
' You need to provide the RuName (eBay Redirect URL name)
oauth2.AppCallbackUrl = "Chilkat_Softwar-ChilkatS-chilka-qydjs"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://auth.sandbox.ebay.com/oauth2/authorize"
oauth2.TokenEndpoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token"

' Replace these with actual values.
oauth2.ClientId = "EBAY_CLIENT_ID"
oauth2.ClientSecret = "EBAY_CLIENT_SECRET"
oauth2.UseBasicAuth = 1
oauth2.CodeChallenge = 0

' The scope query param indicates the access to be provided by the token.
' Multiple scopes can be specified by separating each with a SPACE char.
' See the Ebay OAuth scopes documentation

oauth2.Scope = "https://api.ebay.com/oauth/api_scope https://api.ebay.com/oauth/api_scope/buy.order.readonly https://api.ebay.com/oauth/api_scope/buy.guest.order https://api.ebay.com/oauth/api_scope/sell.marketing.readonly https://api.ebay.com/oauth/api_scope/sell.marketing https://api.ebay.com/oauth/api_scope/sell.inventory.readonly https://api.ebay.com/oauth/api_scope/sell.inventory https://api.ebay.com/oauth/api_scope/sell.account.readonly https://api.ebay.com/oauth/api_scope/sell.account https://api.ebay.com/oauth/api_scope/sell.fulfillment.readonly https://api.ebay.com/oauth/api_scope/sell.fulfillment https://api.ebay.com/oauth/api_scope/sell.analytics.readonly https://api.ebay.com/oauth/api_scope/sell.marketplace.insights.readonly https://api.ebay.com/oauth/api_scope/commerce.catalog.readonly https://api.ebay.com/oauth/api_scope/buy.shopping.cart https://api.ebay.com/oauth/api_scope/buy.offer.auction"

' Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> 1) Then
    outFile.WriteLine(oauth2.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("url = " & 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
' The Ebay 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
Do While (numMsWaited < 60000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs 100
    numMsWaited = numMsWaited + 100
Loop

' 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 (oauth2.AuthFlowState < 3) Then
    success = oauth2.Cancel()
    outFile.WriteLine("No response from the browser!")
    WScript.Quit
End If

' 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 (oauth2.AuthFlowState = 5) Then
    outFile.WriteLine("OAuth2 failed to complete.")
    outFile.WriteLine(oauth2.FailureInfo)
    WScript.Quit
End If

If (oauth2.AuthFlowState = 4) Then
    outFile.WriteLine("OAuth2 authorization was denied.")
    outFile.WriteLine(oauth2.AccessTokenResponse)
    WScript.Quit
End If

If (oauth2.AuthFlowState <> 3) Then
    outFile.WriteLine("Unexpected AuthFlowState:" & oauth2.AuthFlowState)
    WScript.Quit
End If

' Save the full JSON access token response to a file.
set sbJson = CreateObject("Chilkat_9_5_0.StringBuilder")
success = sbJson.Append(oauth2.AccessTokenResponse)
success = sbJson.WriteFile("qa_data/tokens/ebay-access-token.json","utf-8",0)

' The full JSON received looks like this:
' {
'   "access_token": "v^1.1#i^1#p^3#f^0#I^3#r^0#t^H4sIAAA... 3+fBIAAA==",
'   "expires_in": 7200,
'   "refresh_token": "v^1.1#i^1#f^0#p^3#r^1#I^3#t^Ul4xMF8wOkIxQzAzQjg1ND ... fMSNFXjEyODQ=",
'   "refresh_token_expires_in": 47304000,
'   "token_type": "User Access Token"
' }

outFile.WriteLine("OAuth2 authorization granted!")
outFile.WriteLine("Access Token = " & oauth2.AccessToken)

outFile.Close

 

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