Set Locale.ROOT when use String.toLowerCase (#9215)

(cherry picked from commit aa7ac0b)

Author: basil

core/src/main/java/hudson/PluginManager.java

@@ -1435,13 +1435,13 @@ public HttpResponse doPluginsSearch(@QueryParameter String query, @QueryParamete
                     if (query == null || query.isBlank()) {
                         return true;
                     }
-                    return (plugin.name != null && plugin.name.toLowerCase().contains(query.toLowerCase())) ||
-                        (plugin.title != null && plugin.title.toLowerCase().contains(query.toLowerCase())) ||
-                        (plugin.excerpt != null && plugin.excerpt.toLowerCase().contains(query.toLowerCase())) ||
+                    return (plugin.name != null && plugin.name.toLowerCase(Locale.ROOT).contains(query.toLowerCase(Locale.ROOT))) ||
+                        (plugin.title != null && plugin.title.toLowerCase(Locale.ROOT).contains(query.toLowerCase(Locale.ROOT))) ||
+                        (plugin.excerpt != null && plugin.excerpt.toLowerCase(Locale.ROOT).contains(query.toLowerCase(Locale.ROOT))) ||
                         plugin.hasCategory(query) ||
                         plugin.getCategoriesStream()
                             .map(UpdateCenter::getCategoryDisplayName)
-                            .anyMatch(category -> category != null && category.toLowerCase().contains(query.toLowerCase())) ||
+                            .anyMatch(category -> category != null && category.toLowerCase(Locale.ROOT).contains(query.toLowerCase(Locale.ROOT))) ||
                         plugin.hasWarnings() && query.equalsIgnoreCase("warning:");
                 })
                 .limit(Math.max(limit - plugins.size(), 1))

core/src/main/java/hudson/model/AutoCompletionCandidates.java

@@ -32,6 +32,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Locale;
 import javax.servlet.ServletException;
 import jenkins.model.Jenkins;
 import org.kohsuke.stapler.HttpResponse;
@@ -172,6 +173,6 @@ private String contextualNameOf(Item i) {
     }
 
     private static boolean startsWithImpl(String str, String prefix, boolean ignoreCase) {
-        return ignoreCase ? str.toLowerCase().startsWith(prefix.toLowerCase()) : str.startsWith(prefix);
+        return ignoreCase ? str.toLowerCase(Locale.ROOT).startsWith(prefix.toLowerCase(Locale.ROOT)) : str.startsWith(prefix);
     }
 }

core/src/main/java/hudson/search/FixedSet.java

@@ -27,6 +27,7 @@
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 
 /**
  * Set of {@link SearchItem}s that are statically known upfront.
@@ -61,7 +62,7 @@ public void suggest(String token, List<SearchItem> result) {
         boolean caseInsensitive = UserSearchProperty.isCaseInsensitive();
         for (SearchItem i : items) {
             String name = i.getSearchName();
-            if (name != null && (name.contains(token) || (caseInsensitive && name.toLowerCase().contains(token.toLowerCase())))) {
+            if (name != null && (name.contains(token) || (caseInsensitive && name.toLowerCase(Locale.ROOT).contains(token.toLowerCase(Locale.ROOT))))) {
                 result.add(i);
             }
         }

core/src/main/java/jenkins/security/BasicHeaderProcessor.java

@@ -9,6 +9,7 @@
 import hudson.util.Scrambler;
 import java.io.IOException;
 import java.util.List;
+import java.util.Locale;
 import java.util.logging.Logger;
 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
@@ -64,7 +65,7 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
         HttpServletResponse rsp = (HttpServletResponse) response;
         String authorization = req.getHeader("Authorization");
 
-        if (authorization != null && authorization.toLowerCase().startsWith("Basic ".toLowerCase())) {
+        if (authorization != null && authorization.toLowerCase(Locale.ROOT).startsWith("Basic ".toLowerCase(Locale.ROOT))) {
             // authenticate the user
             String uidpassword = Scrambler.descramble(authorization.substring(6));
             int idx = uidpassword.indexOf(':');