Add PrincipalIdentifierStrategy to SessionRegistryImpl for custom principal matching#18794
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Signed-off-by: 98001yash <yashchauhan.gaya@gmail.com>
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This change introduces a pluggable PrincipalIdentifierStrategy
to SessionRegistryImpl to allow custom principal matching logic.
Currently, SessionRegistryImpl relies on equals() when determining
whether two principals represent the same user. In OAuth2/OIDC
scenarios, principal instances (e.g. DefaultOidcUser) may differ
across authentications due to varying attributes, causing
session management (such as maximumSessions) to treat the same
logical user as distinct principals.
This enhancement allows applications to provide a custom
PrincipalIdentifierStrategy to define logical identity matching,
while preserving the existing equals()-based behavior by default
for backward compatibility.
Tests have been added to verify:
Fixes gh-18622