(AutoIt) Shopify OAuth2 Authentication

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This example shows how to obtain an initial access token for a Shopify application using OAuth2 authentication specifically for non-web applications. This process requires displaying a browser window to secure user authorization. In contrast, web-based applications use a different method to obtain an OAuth2 token, as they redirect back to the application via a URL. Note: Once you have the access token, all subsequent Chilkat examples that rely on an already-obtained token are applicable to both web and non-web applications.

Note: This example requires Chilkat v10.1.2 or greater.

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; To further clarify, see OAuth 2.0 Authorization Flow

$oOauth2 = ObjCreate("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.
; Make sure that "http://localhost:3017/" is listed in your Whitelisted Redirection URLs for your Shopify app.
$oOauth2.ListenPort = 3017

; The full content of the Authorization Endpoin for Shopify looks like this:
; https://{shop}.myshopify.com/admin/oauth/authorize?client_id={api_key}&scope={scopes}&redirect_uri={redirect_uri}&state={nonce}&grant_options[]={option}

; Replace "chilkat" with your shop name.
$oOauth2.AuthorizationEndpoint = "https://chilkat.myshopify.com/admin/oauth/authorize"
$oOauth2.TokenEndpoint = "https://chilkat.myshopify.com/admin/oauth/access_token"

; Replace this with your actual API KEY (client ID)
$oOauth2.ClientId = "SHOPIFY_API_KEY"

; This is for Require Proof Key for Code Exchange (PKCE)
; See OAuth2 PKCE Explained
$oOauth2.CodeChallenge = True
$oOauth2.CodeChallengeMethod = "S256"

; Set requested scopes.  See https://help.shopify.com/api/getting-started/authentication/oauth
$oOauth2.Scope = "read_product_listings,read_customers,read_orders,read_draft_orders"

; 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

; Launch the default browser on the system and navigate to the url.
; The LaunchBrowser method was added in Chilkat v10.1.2.
Local $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)

; Save the full JSON access token response to a file.
$oSbJson = ObjCreate("Chilkat.StringBuilder")
$oSbJson.Append($oOauth2.AccessTokenResponse)
$oSbJson.WriteFile("qa_data/tokens/shopify-access-token.json","utf-8",False)

; The saved JSON response looks like this:

; {
;   "access_token": "1364e43a5332583188cb27bc85469b1f",
;   "scope": "read_product_listings,read_customers,read_orders,read_draft_orders"
; }