felixauringer commented on code in PR #3223:
URL: https://github.com/apache/james-project/pull/3223#discussion_r4166742983


##########
server/protocols/jwt/src/main/java/org/apache/james/jwt/PublicKeyReader.java:
##########
@@ -46,7 +58,13 @@ private Optional<PublicKey> publicKeyFrom(PEMParser reader) {
                 return Optional.of(new 
JcaPEMKeyConverter().getPublicKey((SubjectPublicKeyInfo) readPEM));
             }
             if (readPEM instanceof X509CertificateHolder) {
-                SubjectPublicKeyInfo keyInfo = ((X509CertificateHolder) 
readPEM).getSubjectPublicKeyInfo();
+                X509CertificateHolder certHolder = (X509CertificateHolder) 
readPEM;
+                Date now = Date.from(clock.instant());
+                if (now.before(certHolder.getNotBefore()) || 
now.after(certHolder.getNotAfter())) {
+                    LOGGER.warn("Certificate is not valid at {}. Validity: [{} 
- {}]",
+                        now, certHolder.getNotBefore(), 
certHolder.getNotAfter());
+                }

Review Comment:
   Yes, sometimes certificates are necessary that would not be valid in a 
normal browser (e.g. for testing).
   But the issue there is the certificate chain, not the validity period. If 
you self-sign, why not just choose a proper validity period?



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