Add Input Validation for Zendesk Subdomain
Lack of input validation of the Zendesk subdomain could expose users of the library to Server Side Request Forgery (SSRF).
Validate the provided Zendesk subdomain to be a valid subdomain in:
- getAuthUrl
- getAccessToken
References
- PR: #466
- Security Advisory: GHSA-q348-f93x-9gx4