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Dynamics CRM OAuth2 Access Token

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

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Local $bSuccess = False

; To further clarify, see OAuth 2.0 Authorization Flow

$oOauth2 = ObjCreate("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.
$oOauth2.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
$oOauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize"
$oOauth2.TokenEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token"

; Replace these with actual values.
$oOauth2.ClientId = "DYNAMICS-CRM-CLIENT-ID"
$oOauth2.ClientSecret = "DYNAMICS-CRM-SECRET-KEY"

$oOauth2.Resource = "https://mydynamicsdomain.api.crm.dynamics.com"

$oOauth2.RedirectAllowHtml = "<html><body><p>Thank you for granting access.</p></bod></html>"
$oOauth2.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.
Local $sUrl = $oOauth2.StartAuth()
If ($oOauth2.LastMethodSuccess <> True) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

; 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.
$oHttp = ObjCreate("Chilkat.Http")
$oSbPreCheck = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oHttp.QuickGetSb($sUrl,$oSbPreCheck)
If (($oHttp.LastStatus <> 200) Or ($oSbPreCheck.StartsWith("{",True) <> True)) Then
    ConsoleWrite("JSON Error Response:" & @CRLF)
    ConsoleWrite($oSbPreCheck.GetAsString() & @CRLF)
    Exit
EndIf

; If the HTTP request itself failed, then examine the error.
If ($bSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

; 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.
$bSuccess = $oOauth2.LaunchBrowser($sUrl)
If ($bSuccess = False) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

; Wait for the user to approve or deny authorization in the browser.
Local $iNumMsWaited = 0
While ($iNumMsWaited < 90000) And ($oOauth2.AuthFlowState < 3)
    $oOauth2.SleepMs 100
    $iNumMsWaited = $iNumMsWaited + 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 ($oOauth2.AuthFlowState < 3) Then
    $oOauth2.Cancel()
    ConsoleWrite("No response from the browser!" & @CRLF)
    Exit
EndIf

; 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 ($oOauth2.AuthFlowState = 5) Then
    ConsoleWrite("OAuth2 failed to complete." & @CRLF)
    ConsoleWrite($oOauth2.FailureInfo & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState = 4) Then
    ConsoleWrite("OAuth2 authorization was denied." & @CRLF)
    ConsoleWrite($oOauth2.AccessTokenResponse & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState <> 3) Then
    ConsoleWrite("Unexpected AuthFlowState:" & $oOauth2.AuthFlowState & @CRLF)
    Exit
EndIf

ConsoleWrite("OAuth2 authorization granted!" & @CRLF)
ConsoleWrite("Access Token = " & $oOauth2.AccessToken & @CRLF)

; Get the full JSON response:
$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.Load($oOauth2.AccessTokenResponse)
$oJson.EmitCompact = False

; 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 ($oJson.HasMember("expires_on") <> True) Then
    $oDtExpire = ObjCreate("Chilkat.CkDateTime")
    $oDtExpire.SetFromCurrentSystemTime()
    $oDtExpire.AddSeconds($oJson.IntOf("expires_in"))
    $oJson.AppendString("expires_on",$oDtExpire.GetAsUnixTimeStr(False))
EndIf

ConsoleWrite($oJson.Emit() & @CRLF)

; Save the JSON to a file for future requests.
$oFac = ObjCreate("Chilkat.FileAccess")
$oFac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",$oJson.Emit(),"utf-8",False)