Setting EntityID

Hi,

It looks like the SSO module is getting the destination address from incoming HTTP requests to derive an EntityID that it will then send in SAML requests. There doesn't seem to be a way to manually specify this value in the module configuration. This poses a problem if Omeka is in a private network served by a Reverse Proxy. Indeed, the IdP will then receive in the SAML request an "AssertionConsumerServiceURL" tag including Omeka's private address and this URL will be inaccessible to it. Is it possible to plan an evolution to be able to specify the EntityID field of the Service Provider as is done in other SSO plugins (eg: SAML Catalyst for Moodle)?