Filter entities globally?

According to the docs, filtering identity providers is possible per SP.

We have 100s of SPs, and now I'm looking for a way to show a specific IdP only for a few SPs.

The only way I could make this work was by applying a snippet to those few SPs:

  'discopower.filter' => [
      'tags.include' => [
         'all'
      ],
      'entities.include' => [
          'https://needle.idp',
      ],
  ],

and then on every other SP excluding it:

  'discopower.filter' => [
      'entities.exclude' => [
          'https://needle.idp',
      ],
  ],

As said this works but a bit cumbersome as I'd have to make sure this will be there for each new SP etc.

Would it makes sense to be able to supply such a config at a higher level, for example in saml20-idp-hosted.php or some other place?

Start with the filtering section in docs/discopower.md and compare its per-SP configuration with the proposed saml20-idp-hosted.php location. Trace how discovery filters are loaded for each SP and determine where a higher-level setting could be applied. Done means the desired IdP visibility can be configured globally without adding snippets to every SP.