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(Excel) Get a Xero OAuth2 Access Token

Gets a Xero OAuth2 access token.

Download Excel Class Modules

Chilkat Excel Class Modules

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

Dim oauth2 As Chilkat.OAuth2
Set oauth2 = Chilkat.NewOAuth2

' For Xero OAuth2, set the listen port equal to the port used
' in the Authorized Redirect URL for the Client ID.
' For example, in this case the Authorized Redirect URL would be http://localhost:55568/
' Your app should choose a port not likely not used by any other application.
' See Xero OAuth2 for Desktop Apps for more information.
oauth2.ListenPort = 55568

oauth2.AuthorizationEndpoint = "https://login.xero.com/identity/connect/authorize"
oauth2.TokenEndpoint = "https://identity.xero.com/connect/token"

' Replace these with actual values.
oauth2.ClientId = "XERO_APP_OAUTH2_CLIENT_ID"
oauth2.ClientSecret = "XERO_APP_OAUTH2_CLIENT_SECRET"
oauth2.UseBasicAuth = True

' See https://developer.xero.com/documentation/oauth2/scopes for a complete list of scopes.
' You will need to change the scopes depending on what access is needed..
oauth2.Scope = "openid profile email accounting.transactions accounting.attachments accounting.settings payroll.employees offline_access"

' Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.

url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> True) Then
    Debug.Print oauth2.LastErrorText
    Exit Sub
End If

Debug.Print "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
' in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
' in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
' in dBASE: run(false, 'rundll32 url.dll,FileProtocolHandler "' + lcUrl + '"')
' The Google 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...
' System.Diagnostics.Process.Start(url);

' 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 30 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
    Dim success As Boolean
    success = oauth2.Cancel()
    Debug.Print "No response from the browser!"
    Exit Sub
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
    Debug.Print "OAuth2 failed to complete."
    Debug.Print oauth2.FailureInfo
    Exit Sub
End If

If (oauth2.AuthFlowState = 4) Then
    Debug.Print "OAuth2 authorization was denied."
    Debug.Print oauth2.AccessTokenResponse
    Exit Sub
End If

If (oauth2.AuthFlowState <> 3) Then
    Debug.Print "Unexpected AuthFlowState:"; oauth2.AuthFlowState
    Exit Sub
End If

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

' The saved JSON response looks like this:

' 	{
' 	 "access_token": "...",
' 	 "token_type": "Bearer",
' 	 "expires_in": 3600,
' 	 "refresh_token": "..."
' 	}
' 
Debug.Print "OAuth2 authorization granted!"
Debug.Print "Access Token = "; oauth2.AccessToken

 

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