Unicode C

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. Unicode C

#include <C_CkOAuth2W.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkOAuth2W oauth2;
    const wchar_t *url;
    int numMsWaited;
    HCkStringBuilderW sbJson;

    success = FALSE;

    // To further clarify, see OAuth 2.0 Authorization Flow

    oauth2 = CkOAuth2W_Create();

    // 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.
    CkOAuth2W_putListenPort(oauth2,3017);

    // 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.
    CkOAuth2W_putAuthorizationEndpoint(oauth2,L"https://chilkat.myshopify.com/admin/oauth/authorize");
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://chilkat.myshopify.com/admin/oauth/access_token");

    // Replace this with your actual API KEY (client ID)
    CkOAuth2W_putClientId(oauth2,L"SHOPIFY_API_KEY");

    // This is for Require Proof Key for Code Exchange (PKCE)
    // See OAuth2 PKCE Explained
    CkOAuth2W_putCodeChallenge(oauth2,TRUE);
    CkOAuth2W_putCodeChallengeMethod(oauth2,L"S256");

    // Set requested scopes.  See https://help.shopify.com/api/getting-started/authentication/oauth
    CkOAuth2W_putScope(oauth2,L"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 = CkOAuth2W_startAuth(oauth2);
    if (CkOAuth2W_getLastMethodSuccess(oauth2) != TRUE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success = CkOAuth2W_LaunchBrowser(oauth2,url);
    if (success == FALSE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // Wait for the user to approve or deny authorization in the browser.
    numMsWaited = 0;
    while ((numMsWaited < 90000) && (CkOAuth2W_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2W_SleepMs(oauth2,100);
        numMsWaited = numMsWaited + 100;
    }

    // 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 (CkOAuth2W_getAuthFlowState(oauth2) < 3) {
        CkOAuth2W_Cancel(oauth2);
        wprintf(L"No response from the browser!\n");
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // 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 (CkOAuth2W_getAuthFlowState(oauth2) == 5) {
        wprintf(L"OAuth2 failed to complete.\n");
        wprintf(L"%s\n",CkOAuth2W_failureInfo(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) == 4) {
        wprintf(L"OAuth2 authorization was denied.\n");
        wprintf(L"%s\n",CkOAuth2W_accessTokenResponse(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) != 3) {
        wprintf(L"Unexpected AuthFlowState:%d\n",CkOAuth2W_getAuthFlowState(oauth2));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"Access Token = %s\n",CkOAuth2W_accessToken(oauth2));

    // Save the full JSON access token response to a file.
    sbJson = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbJson,CkOAuth2W_accessTokenResponse(oauth2));
    CkStringBuilderW_WriteFile(sbJson,L"qa_data/tokens/shopify-access-token.json",L"utf-8",FALSE);

    // The saved JSON response looks like this:

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


    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);

    }