[java-oidc-common] branch dev/JCOMOIDC-139 updated: Add ui_locales setting on message encoder

[Phil Smart]

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philsmart pushed a commit to branch dev/JCOMOIDC-139
in repository java-oidc-common.

View the commit online:
http://git.shibboleth.net/view/?p=java-oidc-common.git;a=commit;h=ac595659318c116464c176c63f521feed4e8c513

The following commit(s) were added to refs/heads/dev/JCOMOIDC-139 by this push:
     new ac59565  Add ui_locales setting on message encoder
ac59565 is described below

commit ac595659318c116464c176c63f521feed4e8c513
Author: Phil Smart <philip.smart at jisc.ac.uk>
AuthorDate: Wed Oct 15 14:22:31 2025 +0100

    Add ui_locales setting on message encoder
---
 .../oidc/profile/encoding/impl/AbstractOIDCMessageEncoder.java     | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/oidc-common-profile-impl/src/main/java/net/shibboleth/oidc/profile/encoding/impl/AbstractOIDCMessageEncoder.java b/oidc-common-profile-impl/src/main/java/net/shibboleth/oidc/profile/encoding/impl/AbstractOIDCMessageEncoder.java
index c9f87dc..b3b35da 100644
--- a/oidc-common-profile-impl/src/main/java/net/shibboleth/oidc/profile/encoding/impl/AbstractOIDCMessageEncoder.java
+++ b/oidc-common-profile-impl/src/main/java/net/shibboleth/oidc/profile/encoding/impl/AbstractOIDCMessageEncoder.java
@@ -30,6 +30,7 @@ import org.opensaml.messaging.encoder.servlet.AbstractHttpServletResponseMessage
 import org.slf4j.Logger;
 
 import com.nimbusds.jwt.JWT;
+import com.nimbusds.langtag.LangTag;
 import com.nimbusds.oauth2.sdk.ResponseMode;
 import com.nimbusds.oauth2.sdk.ResponseType;
 import com.nimbusds.oauth2.sdk.id.State;
@@ -260,6 +261,12 @@ public abstract class AbstractOIDCMessageEncoder extends AbstractHttpServletResp
             params.add(new Pair<>("login_hint", req.getLoginHint()));          
         }
         
+        if (!req.getUiLocales().isEmpty()) { 
+            final String locales = req.getUiLocales().stream().map(LangTag::toString).filter(s -> !s.isEmpty())
+                .collect(Collectors.joining(" "));
+            params.add(new Pair<>("ui_locales", locales));          
+        }
+        
         if (req.providerSupportsClaimsParameter()) {
             // Add ACRs to claims if any before the claims are serialised
             AuthenticationContextClassReferenceSupport.buildACRClaimsRequest(req);

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