Shopware App Bundle Authentication Failure due to Trailing Slash

[DannyDan]

Summary
Authentication fails in the Shopware app-bundle when the shop_url property contains a trailing slash, causing token retrieval to fail due to malformed URL construction.

Description
When using the Shopware app-bundle in a Symfony server backend application, if the shop_url property ends with a forward slash (/), the authentication process fails. This occurs because the URL for obtaining the OAuth token becomes malformed, resulting in a double slash in the path.
Current Behavior

When shop_url ends with a slash (e.g., "www.test.de/")
The resulting OAuth token URL becomes: "www.test.de//api/oauth/token"
Authentication fails due to the malformed URL with double slashes

Expected Behavior
OAuth token URL should always be correctly formed with a single slash
Authentication should succeed regardless of whether shop_url has a trailing slash
Expected URL format: "www.test.de/api/oauth/token"

Steps to Reproduce
Configure Shopware app-bundle in a Symfony server backend application
Set shop_url property with a trailing slash (e.g., "www.test.de/")
Attempt to authenticate
Observe authentication failure

Impact
Critical severity as it prevents successful authentication
Affects all implementations where shop_url might contain a trailing slash
May cause production issues if not caught during development

Suggested Fix
Implement URL normalization for the shop_url property:

Either strip trailing slashes from shop_url before use
Or implement proper URL path joining that handles slashes correctly

Environment
Component: Shopware app-bundle
Framework: Symfony
Context: Server backend application

Additional Notes
This issue requires immediate attention as it affects core authentication functionality. Consider adding validation or automatic normalization of the shop_url property to prevent this issue.

[nsaliu]

This issue was solved in this project shopware/app-php-sdk by shopware/app-php-sdk#26 and this one shopware/app-php-sdk#32 (will be merged soon) will fix the proof generation.

[shyim]

fixed