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OAuth2 using an HTTP Proxy (for a Desktop Application)

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Shows how to send OAuth2 communications through an HTTP proxy in a desktop application, using Microsoft Graph as an example. This method applies to all OAuth2 applications. AutoIt

Local $bSuccess = False

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

; To use an HTTP proxy with OAuth2, create a Chilkat socket object and specify the details.
$oSocket = ObjCreate("Chilkat.Socket")
; Use your HTTP proxy server domain or IP address.
$oSocket.HttpProxyHostname = "myproxyserver.com"
; Change this to the listening port of your HTTP proxy server (if necessary)
$oSocket.HttpProxyPort = 808
; Specify login/password if needed.
$oSocket.HttpProxyUsername = "myProxyLogin"
$oSocket.HttpProxyPassword = "myProxyPassword"
$oSocket.HttpProxyForHttp = True

$oOauth2 = ObjCreate("Chilkat.OAuth2")

; We don't need to connect the socket beforehand.
; Just tell oauth2 to use the socket which has the HTTP proxy properties.
$bSuccess = $oOauth2.UseConnection($oSocket)

; 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.
$oOauth2.ListenPort = 3017

$oOauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize"
$oOauth2.TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token"

; Replace these with actual values.
$oOauth2.ClientId = "MICROSOFT-GRAPH-CLIENT-ID"
; This is your app password:
$oOauth2.ClientSecret = "MICROSOFT-GRAPH-CLIENT-SECRET"

$oOauth2.CodeChallenge = False
; Provide a SPACE separated list of scopes.
; See https://developer.microsoft.com/en-us/graph/docs/authorization/permission_scopes 

; Important: To get a refresh token in the final response, you have to ask for "offline_access" scope
$oOauth2.Scope = "openid profile offline_access user.readwrite mail.readwrite mail.send files.readwrite"

; 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

ConsoleWrite("url = " & $sUrl & @CRLF)

; 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.Read Mail.ReadWrite Mail.Send",
;   "expires_in": 3600,
;   "ext_expires_in": 0,
;   "access_token": "EwBAA8l6B...",
;   "refresh_token": "MCRMdbe...",
;   "id_token": "eyJ0eXA..."
; }

; 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")
$oFac.WriteEntireTextFile("qa_data/tokens/microsoftGraph.json",$oJson.Emit(),"utf-8",False)