VBScript

Square OAuth2 Access Token

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Demonstrates how to get an access token for the Square API. This example is for desktop apps only (not web apps). VBScript

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

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

set oauth2 = CreateObject("Chilkat.OAuth2")

' This should be the port in the localhost callback URL for your app.  
' The callback URL would look like "http://localhost:3017/" if the port number is 3017.
oauth2.ListenPort = 3017

' To use the production system, change the domains here to "connect.squareup.com"
oauth2.AuthorizationEndpoint = "https://connect.squareupsandbox.com/oauth2/authorize"
oauth2.TokenEndpoint = "https://connect.squareupsandbox.com/oauth2/token"

' Replace these with actual values.
oauth2.ClientId = "APPLICATION_ID"
oauth2.ClientSecret = "APPLICATION_SECRET"

' Make sure to include the scopes you'll need.
oauth2.Scope = "ITEMS_WRITE ITEMS_READ"

' Begin the OAuth2 three-legged 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

' Add the session=False query param to the URL.
set sbUrl = CreateObject("Chilkat.StringBuilder")
success = sbUrl.Append(url)
success = sbUrl.Append("&session=False")
' Launch this URL in the browser.
url = sbUrl.GetAsString()

' Launch the system's default browser navigated to the URL.
success = oauth2.LaunchBrowser(url)
If (success = 0) Then
    outFile.WriteLine(oauth2.LastErrorText)
    WScript.Quit
End If

' Now wait for the authorization.
' We'll wait for a max of 30 seconds.
numMsWaited = 0
Do While (numMsWaited < 30000) 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
    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

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

' Get the full JSON response:
set json = CreateObject("Chilkat.JsonObject")
success = json.Load(oauth2.AccessTokenResponse)
json.EmitCompact = 0

' The JSON response looks like this:

' {
'   "access_token": "EAAAE...depV",
'   "token_type": "bearer",
'   "expires_at": "2020-09-04T23:30:18Z",
'   "merchant_id": "MLQA83866KSR5",
'   "refresh_token": "EQAAEE...jeVfD6MV"
' }

outFile.WriteLine(json.Emit())

' Save the JSON to a file for future requests.
set fac = CreateObject("Chilkat.FileAccess")
success = fac.WriteEntireTextFile("qa_data/tokens/square.json",json.Emit(),"utf-8",0)

outFile.Close