Xojo Plugin Requires Chilkat v10.1.2+

Schwab OAuth2 in a Desktop App

See more Schwab Examples

Demonstrates how to get a Charles Schwab OAuth2 access token from a desktop application or script. Xojo Plugin

Dim success As Boolean
success = False

//  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.

Dim oauth2 As New 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 = True
oauth2.CodeChallenge = False

oauth2.Scope = ""

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
Dim url As String
url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess = False) Then
    System.DebugLog(oauth2.LastErrorText)
    Return
End If

System.DebugLog("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 = False) Then
    System.DebugLog(oauth2.LastErrorText)
    Return
End If

//  Wait for the user to approve or deny authorization in the browser.
Dim numMsWaited As Int32
numMsWaited = 0
While (numMsWaited < 90000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs 100
    numMsWaited = numMsWaited + 100
Wend

//  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()
    System.DebugLog("No response from the browser!")
    Return
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
    System.DebugLog("OAuth2 failed to complete.")
    System.DebugLog(oauth2.FailureInfo)
    Return
End If

If (oauth2.AuthFlowState = 4) Then
    System.DebugLog("OAuth2 authorization was denied.")
    System.DebugLog(oauth2.AccessTokenResponse)
    Return
End If

If (oauth2.AuthFlowState <> 3) Then
    System.DebugLog("Unexpected AuthFlowState:" + Str(oauth2.AuthFlowState))
    Return
End If

//  Save the full JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
success = sbJson.Append(oauth2.AccessTokenResponse)
success = sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",False)

//  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"
//  }

System.DebugLog("OAuth2 authorization granted!")
System.DebugLog("Access Token = " + oauth2.AccessToken)