(VBScript) Schwab OAuth2 in a Desktop App

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

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Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

' 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.

set oauth2 = CreateObject("Chilkat.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.AppCallbackUrl = "https://yourwebserver.com/OAuth2.php"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://api.schwabapi.com/v1/oauth/authorize"
oauth2.TokenEndpoint = "https://api.schwabapi.com/v1/oauth/token"

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

oauth2.Scope = ""

' Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess = 0) Then
    outFile.WriteLine(oauth2.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("url = " & 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 = 0) Then
    outFile.WriteLine(oauth2.LastErrorText)
    WScript.Quit
End If

' Wait for the user to approve or deny authorization in the browser.
numMsWaited = 0
Do While (numMsWaited < 90000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs 100
    numMsWaited = numMsWaited + 100
Loop

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

' 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.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.StringBuilder")
success = sbJson.Append(oauth2.AccessTokenResponse)
success = sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",0)

' 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"
' }

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

outFile.Close