VBScript Requires Chilkat v10.1.2+
Dynamics CRM OAuth2 Access Token

Demonstrates how to get a Microsoft Dynamics CRM OAuth2 access token from a desktop (installed) application or script.
Chilkat VBScript Downloads

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

'  To further clarify, see OAuth 2.0 Authorization Flow

set oauth2 = CreateObject("Chilkat.OAuth2")

'  This should be the port in the localhost redirect URL for your app.
'  Important: Make sure the redirect URI in your Azure app registration 
'  is exactly "http://localhost:3017/".  Don't forget the ending "/" char.
'  The redirect URL would look like "http://localhost:3017/" if the port number is 3017.
oauth2.ListenPort = 3017

'  Get the endpoints from the Azure Portal in the "endpoints" section of App Registrations..
'  The DYNAMICS-ENDPOINT-GUID is a Tenant dynamics-endpoint-guid  such as 1b54e7ee-d61b-4f12-a621-a6b2805b98c2
oauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize"
oauth2.TokenEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token"

'  Replace these with actual values.
oauth2.ClientId = "DYNAMICS-CRM-CLIENT-ID"
oauth2.ClientSecret = "DYNAMICS-CRM-SECRET-KEY"

oauth2.Resource = "https://mydynamicsdomain.api.crm.dynamics.com"

oauth2.RedirectAllowHtml = "<html><body><p>Thank you for granting access.</p></bod></html>"
oauth2.RedirectDenyHtml = "<html><body><p>Maybe next time...</p></bod></html>"

'  Begin the OAuth2 Authorization code 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

'  We can pre-check the URL by sending a GET to catch any up-front errors.
'  If we receive JSON with an error in response, then we don't proceed any farther.

'  If we receive an HTML response, and the response status = 200, then all should be OK.
'  We can proceed by displaying an interactive browser loaded with the url.
set http = CreateObject("Chilkat.Http")
set sbPreCheck = CreateObject("Chilkat.StringBuilder")
success = http.QuickGetSb(url,sbPreCheck)
If ((http.LastStatus <> 200) Or (sbPreCheck.StartsWith("{",1) <> 1)) Then
    outFile.WriteLine("JSON Error Response:")
    outFile.WriteLine(sbPreCheck.GetAsString())
    WScript.Quit
End If

'  If the HTTP request itself failed, then examine the error.
If (success = 0) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

'  OK.. the pre-flight check seems OK, go ahead with getting the interactive user authorization..

'  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

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:

'  {
'    "token_type": "Bearer",
'    "scope": "user_impersonation",
'    "expires_in": "3599",
'    "ext_expires_in": "0",
'    "expires_on": "1524783438",
'    "not_before": "1524779538",
'    "resource": "https://mydomain.api.crm.dynamics.com",
'    "access_token": "...",
'    "refresh_token": "...",
'    "id_token": "..."
'  }

'  If an "expires_on" member does not exist, then add the JSON member by
'  getting the current system date/time and adding the "expires_in" seconds.
'  This way we'll know when the token expires.
If (json.HasMember("expires_on") <> 1) Then
    set dtExpire = CreateObject("Chilkat.CkDateTime")
    success = dtExpire.SetFromCurrentSystemTime()
    success = dtExpire.AddSeconds(json.IntOf("expires_in"))
    success = json.AppendString("expires_on",dtExpire.GetAsUnixTimeStr(0))
End If

outFile.WriteLine(json.Emit())

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

outFile.Close