Delphi ActiveX Requires Chilkat v10.1.2+

Shopify OAuth2 Authentication

See more OAuth2 Examples

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. Delphi ActiveX

var
success: Integer;
oauth2: TChilkatOAuth2;
url: WideString;
numMsWaited: Integer;
sbJson: TChilkatStringBuilder;

begin
success := 0;

//  To further clarify, see OAuth 2.0 Authorization Flow

oauth2 := TChilkatOAuth2.Create(Self);

//  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.
oauth2.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.
oauth2.AuthorizationEndpoint := 'https://chilkat.myshopify.com/admin/oauth/authorize';
oauth2.TokenEndpoint := 'https://chilkat.myshopify.com/admin/oauth/access_token';

//  Replace this with your actual API KEY (client ID)
oauth2.ClientId := 'SHOPIFY_API_KEY';

//  This is for Require Proof Key for Code Exchange (PKCE)
//  See OAuth2 PKCE Explained
oauth2.CodeChallenge := 1;
oauth2.CodeChallengeMethod := 'S256';

//  Set requested scopes.  See https://help.shopify.com/api/getting-started/authentication/oauth
oauth2.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.
url := oauth2.StartAuth();
if (oauth2.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

//  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
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

//  Wait for the user to approve or deny authorization in the browser.
numMsWaited := 0;
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) do
  begin
    oauth2.SleepMs(100);
    numMsWaited := numMsWaited + 100;
  end;

//  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
  begin
    oauth2.Cancel();
    Memo1.Lines.Add('No response from the browser!');
    Exit;
  end;

//  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
  begin
    Memo1.Lines.Add('OAuth2 failed to complete.');
    Memo1.Lines.Add(oauth2.FailureInfo);
    Exit;
  end;

if (oauth2.AuthFlowState = 4) then
  begin
    Memo1.Lines.Add('OAuth2 authorization was denied.');
    Memo1.Lines.Add(oauth2.AccessTokenResponse);
    Exit;
  end;

if (oauth2.AuthFlowState <> 3) then
  begin
    Memo1.Lines.Add('Unexpected AuthFlowState:' + IntToStr(oauth2.AuthFlowState));
    Exit;
  end;

Memo1.Lines.Add('OAuth2 authorization granted!');
Memo1.Lines.Add('Access Token = ' + oauth2.AccessToken);

//  Save the full JSON access token response to a file.
sbJson := TChilkatStringBuilder.Create(Self);
sbJson.Append(oauth2.AccessTokenResponse);
sbJson.WriteFile('qa_data/tokens/shopify-access-token.json','utf-8',0);

//  The saved JSON response looks like this:

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