Htpasswd should not enforce the uid attribute

[jimmy-lt]

The Htpasswd currently enforces the username to the uid attribute.

simplesamlphp-module-authcrypt/src/Auth/Source/Htpasswd.php

Line 100 in 689b2ee

$attributes = array_merge(['uid' => [$username]], $this->attributes);

Ideally this attribute should be user configurable.

The documentation recommends to use urn:oasis:names:tc:SAML:2.0:attrname-format:uri for attribute's NameFormat but forcing the attribute name to uid goes against this.

[tvdijen]

Agreed, so the solution involves two steps:

1. Making the attribute configurable
2. Ensure that the configured name complies with configured NameFormat