Calling getTopLevelGroups is slow inside GroupLDAPStorageMapper#getLDAPGroupMappingsConverted (#8430)

Closes #14820 
---------
Co-authored-by: Michal Hajas <mhajas@redhat.com>

federation/ldap/src/main/java/org/keycloak/storage/ldap/mappers/membership/group/GroupLDAPStorageMapper.java

@@ -54,7 +54,6 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 import java.util.function.Function;
-import java.util.function.Predicate;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -338,7 +337,9 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
 
     private void dropNonExistingKcGroups(RealmModel realm, SynchronizationResult syncResult, Set<String> visitedGroupIds) {
         // Remove keycloak groups, which don't exist in LDAP
-        getAllKcGroups(realm)
+        GroupModel parent = getKcGroupsPathGroup(realm);
+
+        getAllKcGroups(realm, parent)
                 .filter(kcGroup -> !visitedGroupIds.contains(kcGroup.getId()))
                 .forEach(kcGroup -> {
                     logger.debugf("Removing Keycloak group '%s', which doesn't exist in LDAP", kcGroup.getName());
@@ -361,22 +362,22 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
     }
 
 
-    protected GroupModel findKcGroupByLDAPGroup(RealmModel realm, LDAPObject ldapGroup) {
+    protected GroupModel findKcGroupByLDAPGroup(RealmModel realm, GroupModel parent, LDAPObject ldapGroup) {
         String groupNameAttr = config.getGroupNameLdapAttribute();
         String groupName = ldapGroup.getAttributeAsString(groupNameAttr);
 
         if (config.isPreserveGroupsInheritance()) {
             // Override if better effectivity or different algorithm is needed
-            return getAllKcGroups(realm)
+            return getAllKcGroups(realm, parent)
                     .filter(group -> Objects.equals(group.getName(), groupName)).findFirst().orElse(null);
         } else {
             // Without preserved inheritance, it's always at groups path
-            return KeycloakModelUtils.findGroupByPath(realm, getKcGroupPathFromLDAPGroupName(groupName));
+            return session.groups().getGroupByName(realm, parent, groupName);
         }
     }
 
-    protected GroupModel findKcGroupOrSyncFromLDAP(RealmModel realm, LDAPObject ldapGroup, UserModel user) {
-        GroupModel kcGroup = findKcGroupByLDAPGroup(realm, ldapGroup);
+    protected GroupModel findKcGroupOrSyncFromLDAP(RealmModel realm, GroupModel parent, LDAPObject ldapGroup, UserModel user) {
+        GroupModel kcGroup = findKcGroupByLDAPGroup(realm, parent, ldapGroup);
 
         if (kcGroup == null) {
 
@@ -385,7 +386,7 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
                 // Better to sync all groups from LDAP with preserved inheritance
                 if (!syncFromLDAPPerformedInThisTransaction) {
                     syncDataFromFederationProviderToKeycloak(realm);
-                    kcGroup = findKcGroupByLDAPGroup(realm, ldapGroup);
+                    kcGroup = findKcGroupByLDAPGroup(realm, parent, ldapGroup);
                 }
             } else {
                 String groupNameAttr = config.getGroupNameLdapAttribute();
@@ -656,11 +657,12 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
         if (mode == LDAPGroupMapperMode.IMPORT && isCreate) {
 
             List<LDAPObject> ldapGroups = getLDAPGroupMappings(ldapUser);
-
+            if (!ldapGroups.isEmpty()) {
+                GroupModel parent = getKcGroupsPathGroup(realm);
                 // Import role mappings from LDAP into Keycloak DB
                 for (LDAPObject ldapGroup : ldapGroups) {
 
-                GroupModel kcGroup = findKcGroupOrSyncFromLDAP(realm, ldapGroup, user);
+                    GroupModel kcGroup = findKcGroupOrSyncFromLDAP(realm, parent, ldapGroup, user);
                     if (kcGroup != null) {
                         logger.debugf("User '%s' joins group '%s' during import from LDAP", user.getUsername(), kcGroup.getName());
                         user.joinGroup(kcGroup);
@@ -668,6 +670,7 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
                 }
             }
         }
+    }
 
 
     protected String getMembershipUserLdapAttribute() {
@@ -760,14 +763,18 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
             }
 
             List<LDAPObject> ldapGroups = getLDAPGroupMappings(ldapUser);
+            if (!ldapGroups.isEmpty()) {
+                GroupModel parent = getKcGroupsPathGroup(realm);
 
                 cachedLDAPGroupMappings = ldapGroups.stream()
-                    .map(ldapGroup -> findKcGroupOrSyncFromLDAP(realm, ldapGroup, this))
+                        .map(ldapGroup -> findKcGroupOrSyncFromLDAP(realm, parent, ldapGroup, this))
                         .filter(Objects::nonNull)
                         .collect(Collectors.toSet());
 
                 return cachedLDAPGroupMappings.stream();
             }
+            return Stream.empty();
+        }
     }
 
     // LDAP groups path operations
@@ -783,7 +790,7 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
      * Provides KC group defined as groups path or null (top-level group) if corresponding group is not available.
      */
     protected GroupModel getKcGroupsPathGroup(RealmModel realm) {
-        return config.isTopLevelGroupsPath() ? null : KeycloakModelUtils.findGroupByPath(realm, config.getGroupsPath());
+        return config.isTopLevelGroupsPath() ? null : KeycloakModelUtils.findGroupByPath(session.groups(), realm, config.getGroupsPath());
     }
 
     /**
@@ -813,9 +820,7 @@ public class GroupLDAPStorageMapper extends AbstractLDAPStorageMapper implements
     /**
      * Provides a stream of all KC groups (with their sub groups) from groups path configured by the "Groups Path" configuration property.
      */
-    protected Stream<GroupModel> getAllKcGroups(RealmModel realm) {
-        GroupModel topParentGroup = getKcGroupsPathGroup(realm);
-
+    protected Stream<GroupModel> getAllKcGroups(RealmModel realm, GroupModel topParentGroup) {
         Stream<GroupModel> allGroups = realm.getGroupsStream();
         if (topParentGroup == null) return allGroups;
 

federation/ldap/src/main/java/org/keycloak/storage/ldap/mappers/membership/group/GroupLDAPStorageMapperFactory.java

@@ -304,7 +304,7 @@ public class GroupLDAPStorageMapperFactory extends AbstractLDAPStorageMapperFact
         LDAPUtils.validateCustomLdapFilter(config.getConfig().getFirst(GroupMapperConfig.GROUPS_LDAP_FILTER));
 
         String group = new GroupMapperConfig(config).getGroupsPath();
-        if (!GroupMapperConfig.DEFAULT_LDAP_GROUPS_PATH.equals(group) && KeycloakModelUtils.findGroupByPath(realm, group) == null) {
+        if (!GroupMapperConfig.DEFAULT_LDAP_GROUPS_PATH.equals(group) && KeycloakModelUtils.findGroupByPath(session.groups(), realm, group) == null) {
             throw new ComponentValidationException("ldapErrorMissingGroupsPathGroup");
         }
     }

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmCacheManager.java

@@ -26,6 +26,7 @@ import org.keycloak.models.cache.infinispan.events.RealmCacheInvalidationEvent;
 import org.keycloak.models.cache.infinispan.stream.GroupListPredicate;
 import org.keycloak.models.cache.infinispan.stream.HasRolePredicate;
 import org.keycloak.models.cache.infinispan.stream.InClientPredicate;
+import org.keycloak.models.cache.infinispan.stream.InGroupPredicate;
 import org.keycloak.models.cache.infinispan.stream.InRealmPredicate;
 
 import java.util.Set;
@@ -96,6 +97,10 @@ public class RealmCacheManager extends CacheManager {
         addInvalidations(GroupListPredicate.create().realm(realmId), invalidations);
     }
 
+    public void groupNameInvalidations(String groupId, Set<String> invalidations) {
+        addInvalidations(InGroupPredicate.create().group(groupId), invalidations);
+    }
+
     public void clientAdded(String realmId, String clientUUID, String clientId, Set<String> invalidations) {
         invalidations.add(RealmCacheSession.getRealmClientsQueryCacheKey(realmId));
     }

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmCacheSession.java

@@ -277,6 +277,7 @@ public class RealmCacheSession implements CacheRealmProvider {
 
     private void invalidateGroup(String id, String realmId, boolean invalidateQueries) {
         invalidateGroup(id);
+        cache.groupNameInvalidations(id, invalidations);
         if (invalidateQueries) {
             cache.groupQueriesInvalidations(realmId, invalidations);
         }
@@ -564,6 +565,14 @@ public class RealmCacheSession implements CacheRealmProvider {
         return realm + ".top.groups";
     }
 
+    static String getGroupByNameCacheKey(String realm, String parentId, String name) {
+        if (parentId != null) {
+            return realm + ".group." + parentId + "." + name;
+        } else {
+            return realm + ".group.top." + name;
+        }
+    }
+
     static String getRolesCacheKey(String container) {
         return container + ROLES_QUERY_SUFFIX;
     }
@@ -886,6 +895,33 @@ public class RealmCacheSession implements CacheRealmProvider {
         return adapter;
     }
 
+    @Override
+    public GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        String cacheKey = getGroupByNameCacheKey(realm.getId(), parent != null? parent.getId(): null, name);
+        GroupNameQuery query = cache.get(cacheKey, GroupNameQuery.class);
+        if (query != null) {
+            logger.tracev("Group by name cache hit: {0}", name);
+        }
+        if (query == null) {
+            Long loaded = cache.getCurrentRevision(cacheKey);
+            GroupModel model = getGroupDelegate().getGroupByName(realm, parent, name);
+            if (model == null) return null;
+            if (invalidations.contains(model.getId())) return model;
+            query = new GroupNameQuery(loaded, cacheKey, model.getId(), realm);
+            cache.addRevisioned(query, startupRevision);
+            return model;
+        } else if (invalidations.contains(cacheKey)) {
+            return getGroupDelegate().getGroupByName(realm, parent, name);
+        } else {
+            String groupId = query.getGroupId();
+            if (invalidations.contains(groupId)) {
+                return getGroupDelegate().getGroupByName(realm, parent, name);
+            }
+            return getGroupById(realm, groupId);
+        }
+
+    }
+
     @Override
     public void moveGroup(RealmModel realm, GroupModel group, GroupModel toParent) {
         invalidateGroup(group.getId(), realm.getId(), true);

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/entities/GroupNameQuery.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.models.cache.infinispan.entities;
+
+import org.keycloak.models.RealmModel;
+
+public class GroupNameQuery extends AbstractRevisioned implements InRealm {
+    private final String realm;
+    private final String realmName;
+    private final String groupId;
+
+    public GroupNameQuery(Long revisioned, String id, String groupId, RealmModel realm) {
+        super(revisioned, id);
+        this.realm = realm.getId();
+        this.realmName = realm.getName();
+        this.groupId = groupId;
+    }
+
+    public String getGroupId() {
+        return groupId;
+    }
+
+    public String getRealm() {
+        return realm;
+    }
+
+    @Override
+    public String toString() {
+        return "GroupNameQuery{" +
+                "id='" + getId() + "'" +
+                "realmName='" + realmName + '\'' +
+                '}';
+    }
+}

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/events/GroupMovedEvent.java

@@ -62,6 +62,7 @@ public class GroupMovedEvent extends InvalidationEvent implements RealmCacheInva
     @Override
     public void addInvalidations(RealmCacheManager realmCache, Set<String> invalidations) {
         realmCache.groupQueriesInvalidations(realmId, invalidations);
+        realmCache.groupNameInvalidations(groupId, invalidations);
         if (newParentId != null) {
             invalidations.add(newParentId);
         }

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/events/GroupRemovedEvent.java

@@ -60,6 +60,7 @@ public class GroupRemovedEvent extends InvalidationEvent implements RealmCacheIn
     @Override
     public void addInvalidations(RealmCacheManager realmCache, Set<String> invalidations) {
         realmCache.groupQueriesInvalidations(realmId, invalidations);
+        realmCache.groupNameInvalidations(groupId, invalidations);
         if (parentId != null) {
             invalidations.add(parentId);
         }

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/events/GroupUpdatedEvent.java

@@ -54,7 +54,7 @@ public class GroupUpdatedEvent extends InvalidationEvent implements RealmCacheIn
 
     @Override
     public void addInvalidations(RealmCacheManager realmCache, Set<String> invalidations) {
-        // Nothing. ID already invalidated
+        realmCache.groupNameInvalidations(groupId, invalidations);
     }
 
     public static class ExternalizerImpl implements Externalizer<GroupUpdatedEvent> {

model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/stream/InGroupPredicate.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2022 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.models.cache.infinispan.stream;
+
+import org.keycloak.models.cache.infinispan.entities.GroupNameQuery;
+import org.keycloak.models.cache.infinispan.entities.Revisioned;
+
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.Serializable;
+import java.util.Map;
+import java.util.function.Predicate;
+import org.infinispan.commons.marshall.Externalizer;
+import org.infinispan.commons.marshall.MarshallUtil;
+import org.infinispan.commons.marshall.SerializeWith;
+
+@SerializeWith(InGroupPredicate.ExternalizerImpl.class)
+public class InGroupPredicate implements Predicate<Map.Entry<String, Revisioned>>, Serializable {
+    private String group;
+
+    public static InGroupPredicate create() {
+        return new InGroupPredicate();
+    }
+
+    public InGroupPredicate group(String id) {
+        group = id;
+        return this;
+    }
+
+    @Override
+    public boolean test(Map.Entry<String, Revisioned> entry) {
+        Object value = entry.getValue();
+        if (value == null) return false;
+        if (!(value instanceof GroupNameQuery)) return false;
+
+        return group.equals(((GroupNameQuery)value).getGroupId());
+    }
+
+    public static class ExternalizerImpl implements Externalizer<InGroupPredicate> {
+
+        private static final int VERSION_1 = 1;
+
+        @Override
+        public void writeObject(ObjectOutput output, InGroupPredicate obj) throws IOException {
+            output.writeByte(VERSION_1);
+
+            MarshallUtil.marshallString(obj.group, output);
+        }
+
+        @Override
+        public InGroupPredicate readObject(ObjectInput input) throws IOException, ClassNotFoundException {
+            switch (input.readByte()) {
+                case VERSION_1:
+                    return readObjectVersion1(input);
+                default:
+                    throw new IOException("Unknown version");
+            }
+        }
+
+        public InGroupPredicate readObjectVersion1(ObjectInput input) throws IOException, ClassNotFoundException {
+            InGroupPredicate res = new InGroupPredicate();
+            res.group = MarshallUtil.unmarshallString(input);
+
+            return res;
+        }
+    }
+}

model/infinispan/src/main/java/org/keycloak/models/sessions/infinispan/entities/wildfly/InGroupPredicateWFExternalizer.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2022 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.models.sessions.infinispan.entities.wildfly;
+
+import org.keycloak.models.cache.infinispan.stream.InGroupPredicate;
+
+public class InGroupPredicateWFExternalizer extends InfinispanExternalizerAdapter<InGroupPredicate> {
+
+    public InGroupPredicateWFExternalizer() {
+        super(InGroupPredicate.class, new InGroupPredicate.ExternalizerImpl());
+    }
+}

model/infinispan/src/main/resources/META-INF/services/org.wildfly.clustering.marshalling.Externalizer

@@ -55,6 +55,7 @@ org.keycloak.models.sessions.infinispan.entities.wildfly.LockEntryWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.ActionTokenValueEntityWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.RoleAddedEventWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.InClientPredicateWFExternalizer
+org.keycloak.models.sessions.infinispan.entities.wildfly.InGroupPredicateWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.UserFullInvalidationEventWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.ClientRemovedSessionEventWFExternalizer
 org.keycloak.models.sessions.infinispan.entities.wildfly.SessionPredicateWFExternalizer

model/jpa/src/main/java/org/keycloak/models/jpa/JpaRealmProvider.java

@@ -435,6 +435,20 @@ public class JpaRealmProvider implements RealmProvider, ClientProvider, ClientSc
         return adapter;
     }
 
+    @Override
+    public GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        TypedQuery<String> query = em.createNamedQuery("getGroupIdByNameAndParent", String.class);
+        query.setParameter("name", name);
+        query.setParameter("realm", realm.getId());
+        query.setParameter("parent", parent != null ? parent.getId() : GroupEntity.TOP_PARENT_ID);
+        List<String> entities = query.getResultList();
+        if (entities.isEmpty()) return null;
+        if (entities.size() > 1) throw new IllegalStateException("Should not be more than one Group with same name");
+        String id = query.getResultList().get(0);
+
+        return session.groups().getGroupById(realm, id);
+    }
+
     @Override
     public void moveGroup(RealmModel realm, GroupModel group, GroupModel toParent) {
         if (toParent != null && group.getId().equals(toParent.getId())) {

model/jpa/src/main/java/org/keycloak/models/jpa/entities/GroupEntity.java

@@ -37,7 +37,8 @@ import java.util.LinkedList;
         @NamedQuery(name="getGroupCountByNameContainingFromIdList", query="select count(u) from GroupEntity u where u.realm = :realm and lower(u.name) like lower(concat('%',:search,'%')) and u.id in :ids"),
         @NamedQuery(name="getTopLevelGroupIds", query="select u.id from GroupEntity u where u.parentId = :parent and u.realm = :realm order by u.name ASC"),
         @NamedQuery(name="getGroupCount", query="select count(u) from GroupEntity u where u.realm = :realm"),
-        @NamedQuery(name="getTopLevelGroupCount", query="select count(u) from GroupEntity u where u.realm = :realm and u.parentId = :parent")
+        @NamedQuery(name="getTopLevelGroupCount", query="select count(u) from GroupEntity u where u.realm = :realm and u.parentId = :parent"),
+        @NamedQuery(name="getGroupIdByNameAndParent", query="select u.id from GroupEntity u where u.realm = :realm and u.parentId = :parent and u.name = :name")
 })
 @Entity
 @Table(name="KEYCLOAK_GROUP",

model/legacy-private/src/main/java/org/keycloak/storage/GroupStorageManager.java

@@ -55,6 +55,11 @@ public class GroupStorageManager extends AbstractStorageManager<GroupStorageProv
         return provider.getGroupById(realm, id);
     }
 
+    @Override
+    public GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        return localStorage().getGroupByName(realm, parent, name);
+    }
+
     @Override
     public Stream<GroupModel> searchGroupsByAttributes(RealmModel realm, Map<String, String> attributes, Integer firstResult, Integer maxResults) {
         Stream<GroupModel> local = localStorage().searchGroupsByAttributes(realm, attributes, firstResult, maxResults);

model/map/src/main/java/org/keycloak/models/map/group/MapGroupProvider.java

@@ -93,6 +93,28 @@ public class MapGroupProvider implements GroupProvider {
                 : entityToAdapterFunc(realm).apply(entity);
     }
 
+    @Override
+    public GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        if (name == null) {
+            return null;
+        }
+
+        LOG.tracef("getGroupByName(%s, %s)%s", realm, name, getShortStackTrace());
+
+        DefaultModelCriteria<GroupModel> mcb = criteria();
+        mcb = mcb.compare(SearchableFields.NAME, Operator.EQ, name)
+                .compare(SearchableFields.REALM_ID, Operator.EQ, realm.getId());
+        if (parent != null) {
+            mcb = mcb.compare(SearchableFields.PARENT_ID, Operator.EQ, parent.getId());
+        } else {
+            mcb = mcb.compare(SearchableFields.PARENT_ID, Operator.NOT_EXISTS);
+        }
+        QueryParameters<GroupModel> queryParameters = withCriteria(mcb);
+        String groupId = storeWithRealm(realm).read(queryParameters).findFirst().map(MapGroupEntity::getId)
+                .orElse(null);
+        return groupId == null ? null : session.groups().getGroupById(realm, groupId);
+    }
+
     @Override
     public Stream<GroupModel> getGroupsStream(RealmModel realm) {
         return getGroupsStreamInternal(realm, null, null);

server-spi-private/src/main/java/org/keycloak/models/utils/KeycloakModelUtils.java

@@ -36,6 +36,7 @@ import org.keycloak.models.ClientScopeModel;
 import org.keycloak.models.ClientSecretConstants;
 import org.keycloak.models.Constants;
 import org.keycloak.models.GroupModel;
+import org.keycloak.models.GroupProvider;
 import org.keycloak.models.IdentityProviderModel;
 import org.keycloak.models.KeycloakContext;
 import org.keycloak.models.KeycloakSession;
@@ -763,6 +764,43 @@ public final class KeycloakModelUtils {
         return segments;
     }
 
+    public static GroupModel findGroupByPath(GroupProvider groupProvider, RealmModel realm, String path) {
+        if (path == null) {
+            return null;
+        }
+        if (path.startsWith(GROUP_PATH_SEPARATOR)) {
+            path = path.substring(1);
+        }
+        if (path.endsWith(GROUP_PATH_SEPARATOR)) {
+            path = path.substring(0, path.length() - 1);
+        }
+        String[] split = path.split(GROUP_PATH_SEPARATOR);
+        if (split.length == 0) return null;
+        return getGroupModel(groupProvider, realm, null, split, 0);
+    }
+
+    private static GroupModel getGroupModel(GroupProvider groupProvider, RealmModel realm, GroupModel parent, String[] split, int index) {
+        StringBuilder nameBuilder = new StringBuilder();
+        for (int i = index; i < split.length; i++) {
+            nameBuilder.append(split[i]);
+            GroupModel group = groupProvider.getGroupByName(realm, parent, nameBuilder.toString());
+            if (group != null) {
+                if (i < split.length-1) {
+                    return getGroupModel(groupProvider, realm, group, split, i+1);
+                } else {
+                    return group;
+                }
+            }
+            nameBuilder.append(GROUP_PATH_SEPARATOR);
+        }
+        return null;
+    }
+
+    /**
+     *
+     * @deprecated please use {@link #findGroupByPath(GroupProvider, RealmModel, String)} instead
+     */
+    @Deprecated
     public static GroupModel findGroupByPath(RealmModel realm, String path) {
         if (path == null) {
             return null;

server-spi/src/main/java/org/keycloak/storage/group/GroupLookupProvider.java

@@ -19,9 +19,7 @@ package org.keycloak.storage.group;
 import org.keycloak.models.GroupModel;
 import org.keycloak.models.RealmModel;
 
-import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 public interface GroupLookupProvider {
@@ -35,6 +33,19 @@ public interface GroupLookupProvider {
      */
     GroupModel getGroupById(RealmModel realm, String id);
 
+    /**
+     * Returns a group from the given realm with the corresponding name and parent
+     *
+     * @param realm  Realm.
+     * @param parent parent Group. If {@code null} top level groups are searched
+     * @param name   name.
+     * @return GroupModel with the corresponding name.
+     */
+    default GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        return (parent == null ? realm.getTopLevelGroupsStream() : parent.getSubGroupsStream())
+                .filter(groupModel -> groupModel.getName().equals(name)).findFirst().orElse(null);
+    }
+
     /**
      * Returns the group hierarchy with the given string in name for the given realm.
      *

testsuite/integration-arquillian/servers/auth-server/services/testsuite-providers/src/main/java/org/keycloak/testsuite/federation/HardcodedGroupStorageProvider.java

@@ -52,6 +52,12 @@ public class HardcodedGroupStorageProvider implements GroupStorageProvider {
         return null;
     }
 
+    @Override
+    public GroupModel getGroupByName(RealmModel realm, GroupModel parent, String name) {
+        if (this.groupName.equals(name)) return new HardcodedGroupAdapter(realm);
+        return null;
+    }
+
     @Override
     public Stream<GroupModel> searchForGroupByNameStream(RealmModel realm, String search, Boolean exact, Integer firstResult, Integer maxResults) {
         if (Boolean.parseBoolean(component.getConfig().getFirst(HardcodedGroupStorageProviderFactory.DELAYED_SEARCH))) try {

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/federation/ldap/LDAPGroupMapperTest.java

@@ -94,31 +94,31 @@ public class LDAPGroupMapperTest extends AbstractLDAPTest {
             // 1 - Grant some groups in LDAP
 
             // This group should already exists as it was imported from LDAP
-            GroupModel group1 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1");
+            GroupModel group1 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1");
             john.joinGroup(group1);
 
             // This group should already exists as it was imported from LDAP
-            GroupModel group11 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1/group11");
+            GroupModel group11 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1/group11");
             mary.joinGroup(group11);
 
             // This group should already exists as it was imported from LDAP
-            GroupModel group12 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1/group12");
+            GroupModel group12 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1/group12");
             john.joinGroup(group12);
             mary.joinGroup(group12);
 
             // This group should already exists as it was imported from LDAP
-            GroupModel groupWithSlashesInName = KeycloakModelUtils.findGroupByPath(appRealm, "Team 2016/2017");
+            GroupModel groupWithSlashesInName = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "Team 2016/2017");
             john.joinGroup(groupWithSlashesInName);
             mary.joinGroup(groupWithSlashesInName);
 
             // This group should already exists as it was imported from LDAP
-            GroupModel groupChildWithSlashesInName = KeycloakModelUtils.findGroupByPath(appRealm, "defaultGroup1/Team Child 2018/2019");
+            GroupModel groupChildWithSlashesInName = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "defaultGroup1/Team Child 2018/2019");
             john.joinGroup(groupChildWithSlashesInName);
             mary.joinGroup(groupChildWithSlashesInName);
 
-            Assert.assertEquals("Team SubChild 2020/2021", KeycloakModelUtils.findGroupByPath(appRealm, "defaultGroup1/Team Child 2018/2019/Team SubChild 2020/2021").getName());
-            Assert.assertEquals("defaultGroup14", KeycloakModelUtils.findGroupByPath(appRealm, "defaultGroup13/Team SubChild 2022/2023/A/B/C/D/E/defaultGroup14").getName());
-            Assert.assertEquals("Team SubChild 2026/2027", KeycloakModelUtils.findGroupByPath(appRealm, "Team Root 2024/2025/A/B/C/D/defaultGroup15/Team SubChild 2026/2027").getName());
+            Assert.assertEquals("Team SubChild 2020/2021", KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "defaultGroup1/Team Child 2018/2019/Team SubChild 2020/2021").getName());
+            Assert.assertEquals("defaultGroup14", KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "defaultGroup13/Team SubChild 2022/2023/A/B/C/D/E/defaultGroup14").getName());
+            Assert.assertEquals("Team SubChild 2026/2027", KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "Team Root 2024/2025/A/B/C/D/defaultGroup15/Team SubChild 2026/2027").getName());
         });
 
 
@@ -146,11 +146,11 @@ public class LDAPGroupMapperTest extends AbstractLDAPTest {
             LDAPTestContext ctx = LDAPTestContext.init(session);
             RealmModel appRealm = ctx.getRealm();
 
-            GroupModel group1 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1");
-            GroupModel group11 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1/group11");
-            GroupModel group12 = KeycloakModelUtils.findGroupByPath(appRealm, "/group1/group12");
-            GroupModel groupTeam20162017 = KeycloakModelUtils.findGroupByPath(appRealm, "Team 2016/2017");
-            GroupModel groupTeamChild20182019 = KeycloakModelUtils.findGroupByPath(appRealm, "defaultGroup1/Team Child 2018/2019");
+            GroupModel group1 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1");
+            GroupModel group11 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1/group11");
+            GroupModel group12 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "/group1/group12");
+            GroupModel groupTeam20162017 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "Team 2016/2017");
+            GroupModel groupTeamChild20182019 = KeycloakModelUtils.findGroupByPath(session.groups(), appRealm, "defaultGroup1/Team Child 2018/2019");
             UserModel john = session.users().getUserByUsername(appRealm, "johnkeycloak");
             UserModel mary = session.users().getUserByUsername(appRealm, "marykeycloak");
 

testsuite/model/src/test/java/org/keycloak/testsuite/model/group/GroupModelTest.java

@@ -22,6 +22,7 @@ import org.keycloak.models.Constants;
 import org.keycloak.models.GroupModel;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
+import org.keycloak.models.utils.KeycloakModelUtils;
 import org.keycloak.testsuite.model.KeycloakModelTest;
 
 import java.util.Arrays;
@@ -29,9 +30,11 @@ import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
+import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.nullValue;
 
 public class GroupModelTest extends KeycloakModelTest {
 
@@ -99,4 +102,125 @@ public class GroupModelTest extends KeycloakModelTest {
         });
     }
 
+    @Test
+    public void testGroupByName() {
+        String subGroupId1 = withRealm(realmId, (session, realm) -> {
+            GroupModel group = session.groups().createGroup(realm, "parent-1");
+            GroupModel subGroup = session.groups().createGroup(realm, "sub-group-1", group);
+           return subGroup.getId();
+        });
+
+        String subGroupId2 = withRealm(realmId, (session, realm) -> {
+            GroupModel group = session.groups().createGroup(realm, "parent-2");
+            GroupModel subGroup = session.groups().createGroup(realm, "sub-group-1", group);
+            return subGroup.getId();
+        });
+        withRealm(realmId, (session, realm) -> {
+            GroupModel group1 = session.groups().getGroupByName(realm, null,"parent-1");
+            GroupModel group2 = session.groups().getGroupByName(realm, null,"parent-2");
+
+            GroupModel subGroup1 = session.groups().getGroupByName(realm, group1,"sub-group-1");
+            GroupModel subGroup2 = session.groups().getGroupByName(realm, group2,"sub-group-1");
+
+            assertThat(subGroup1.getId(), equalTo(subGroupId1));
+            assertThat(subGroup1.getName(), equalTo("sub-group-1"));
+            assertThat(subGroup2.getId(), equalTo(subGroupId2));
+            assertThat(subGroup2.getName(), equalTo("sub-group-1"));
+            return null;
+        });
+    }
+
+    @Test
+    public void testConflictingNames() {
+        final String conflictingGroupName = "conflicting-group-name";
+
+        String parentGroupWithChildId = withRealm(realmId, (session, realm) -> {
+            GroupModel parentGroupWithChild = session.groups().createGroup(realm, "parent-1");
+            GroupModel subGroup1 = session.groups().createGroup(realm, conflictingGroupName, parentGroupWithChild);
+            return parentGroupWithChild.getId();
+        });
+
+        String parentGroupWithConflictingNameId = withRealm(realmId, (session, realm) -> session.groups().createGroup(realm, conflictingGroupName).getId());
+        String parentGroupWithoutChildrenId = withRealm(realmId, (session, realm) -> session.groups().createGroup(realm, "parent-2").getId());
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel searchedGroup = session.groups().getGroupByName(realm, null, conflictingGroupName);
+            assertThat(searchedGroup, notNullValue());
+            assertThat(searchedGroup.getId(), equalTo(parentGroupWithConflictingNameId));
+            return null;
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel parentGroupWithChild = session.groups().getGroupById(realm, parentGroupWithChildId);
+            GroupModel searchedGroup = session.groups().getGroupByName(realm, parentGroupWithChild, conflictingGroupName);
+            assertThat(searchedGroup, notNullValue());
+            assertThat(searchedGroup.getParentId(), equalTo(parentGroupWithChildId));
+            return null;
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel parentGroupWithoutChildren = session.groups().getGroupById(realm, parentGroupWithoutChildrenId);
+            GroupModel searchedGroup = session.groups().getGroupByName(realm, parentGroupWithoutChildren, conflictingGroupName);
+            assertThat(searchedGroup, nullValue());
+            return null;
+        });
+    }
+
+    @Test
+    public void testGroupByNameCacheInvalidation() {
+        String subGroupId1 = withRealm(realmId, (session, realm) -> {
+            GroupModel group = session.groups().createGroup(realm, "parent-1");
+            GroupModel subGroup = session.groups().createGroup(realm, "sub-group-1", group);
+            return subGroup.getId();
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel group1 = session.groups().getGroupByName(realm, null, "parent-1");
+            GroupModel subGroup1 = session.groups().getGroupByName(realm, group1, "sub-group-1");
+            assertThat(subGroup1.getId(), equalTo(subGroupId1));
+            return null;
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel group1 = session.groups().getGroupByName(realm, null, "parent-1");
+            GroupModel subGroup1 = session.groups().getGroupByName(realm, group1, "sub-group-1");
+            session.groups().removeGroup(realm, subGroup1);
+            return null;
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel group1 = session.groups().getGroupByName(realm, null, "parent-1");
+            GroupModel subGroup1 = session.groups().getGroupByName(realm, group1, "sub-group-1");
+            assertThat(subGroup1, nullValue());
+            return null;
+        });
+
+    }
+    @Test
+    public void testFindGroupByPath() {
+        String subGroupId1 = withRealm(realmId, (session, realm) -> {
+            GroupModel group = session.groups().createGroup(realm, "parent-1");
+            GroupModel subGroup = session.groups().createGroup(realm, "sub-group-1", group);
+            return subGroup.getId();
+        });
+
+        String subGroupIdWithSlash = withRealm(realmId, (session, realm) -> {
+            GroupModel group = session.groups().createGroup(realm, "parent-2");
+            GroupModel subGroup = session.groups().createGroup(realm, "sub-group/1", group);
+            return subGroup.getId();
+        });
+
+        withRealm(realmId, (session, realm) -> {
+            GroupModel group1 = KeycloakModelUtils.findGroupByPath(session.groups(), realm, "/parent-1");
+            GroupModel group2 = KeycloakModelUtils.findGroupByPath(session.groups(), realm, "/parent-2");
+            assertThat(group1.getName(), equalTo("parent-1"));
+            assertThat(group2.getName(), equalTo("parent-2"));
+
+            GroupModel subGroup1 = KeycloakModelUtils.findGroupByPath(session.groups(), realm, "/parent-1/sub-group-1");
+            GroupModel subGroup2 = KeycloakModelUtils.findGroupByPath(session.groups(), realm, "/parent-2/sub-group/1");
+            assertThat(subGroup1.getId(), equalTo(subGroupId1));
+            assertThat(subGroup2.getId(), equalTo(subGroupIdWithSlash));
+            return null;
+        });
+    }
 }