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Cache on URI not registration #56

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Merged
buckett merged 2 commits into from
Jan 6, 2026
Merged

Cache on URI not registration #56

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8e19b6c
Cache on URI not registration
buckett Jan 2, 2026
237658b
Fix race condition in JwtDecoder caching with computeIfAbsent (#57)
Copilot Jan 2, 2026
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35 changes: 16 additions & 19 deletions ...lti13/security/oauth2/client/lti/authentication/OidcLaunchFlowAuthenticationProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -163,27 +163,24 @@ private OidcIdToken createOidcToken(ClientRegistration clientRegistration, Strin
}

private JwtDecoder getJwtDecoder(ClientRegistration clientRegistration) {
JwtDecoder jwtDecoder = this.jwtDecoders.get(clientRegistration.getRegistrationId());
if (jwtDecoder == null) {
if (!StringUtils.hasText(clientRegistration.getProviderDetails().getJwkSetUri())) {
OAuth2Error oauth2Error = new OAuth2Error(
MISSING_SIGNATURE_VERIFIER_ERROR_CODE,
"Failed to find a Signature Verifier for Client Registration: '" +
clientRegistration.getRegistrationId() + "'. Check to ensure you have configured the JwkSet URI.",
null
);
throw new OAuth2AuthenticationException(oauth2Error, oauth2Error.toString());
}
// TODO This should look at the Cache-Control header so to expire old jwtDecoders.
// Canvas looks to rotate it's keys monthly.
String jwkSetUri = clientRegistration.getProviderDetails().getJwkSetUri();
NimbusJwtDecoder.JwkSetUriJwtDecoderBuilder decoderBuilder = NimbusJwtDecoder.withJwkSetUri(jwkSetUri).jwsAlgorithm(SignatureAlgorithm.from(JwsAlgorithms.RS256));
final String jwkSetUri = clientRegistration.getProviderDetails().getJwkSetUri();
if (!StringUtils.hasText(jwkSetUri)) {
OAuth2Error oauth2Error = new OAuth2Error(
MISSING_SIGNATURE_VERIFIER_ERROR_CODE,
"Failed to find a Signature Verifier for Client Registration: '" +
clientRegistration.getRegistrationId() + "'. Check to ensure you have configured the JwkSet URI.",
null
);
throw new OAuth2AuthenticationException(oauth2Error, oauth2Error.toString());
}
// TODO This should look at the Cache-Control header so to expire old jwtDecoders.
// Canvas looks to rotate its keys monthly.
return this.jwtDecoders.computeIfAbsent(jwkSetUri, uri -> {
NimbusJwtDecoder.JwkSetUriJwtDecoderBuilder decoderBuilder = NimbusJwtDecoder.withJwkSetUri(uri).jwsAlgorithm(SignatureAlgorithm.from(JwsAlgorithms.RS256));
if (restOperations != null) {
decoderBuilder.restOperations(restOperations);
}
jwtDecoder = decoderBuilder.build();
this.jwtDecoders.put(clientRegistration.getRegistrationId(), jwtDecoder);
}
return jwtDecoder;
return decoderBuilder.build();
});
}
}