Option to sign and verify paths instead of absolute URLs

[melbings]

On our multi-tenant system, separate tenants operate on separate domains. It's possible that such a domain might change one day - rendering all the links that might still "float around" invalid.

It might be useful to have the option to base the signature process on absolute URL or path only?

E.g., sign the URL https://foo.mycompany.com/do-something with the full URL (https://foo.mycompany.com) or the path only (/do-something).

We might be able to provide a PR if this seems useful for anybody else.

[weaverryan]

That seems reasonable. Actually, we could probably ALWAYS sign the path, not the full URL - I can't think of why the domain needs to be in the signature. But, for safety, an option is probably better (we could choose, in the future, to force that option to be set if we wanted to deprecate the old way).

I believe the logic is all in this class: https://github.com/SymfonyCasts/verify-email-bundle/blob/eb7bc997f36ad872a0d56bf209fe37fed148b0a7/src/VerifyEmailHelper.php - you'd need to change both how the signature is created in one method and how the signature is checked in another.

Cheers!