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/*
* JBoss, Home of Professional Open Source
* Copyright 2013 Red Hat, Inc., and individual 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.wildfly.security.auth.server;
import java.security.Principal;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
import org.wildfly.common.Assert;
import org.wildfly.security.evidence.Evidence;
/**
* A realm mapper. Examines authentication identity information and translates it into a realm name. If the realm
* mapper does not recognize the authentication information, a default realm will be chosen.
*
* @author David M. Lloyd
*/
@FunctionalInterface
public interface RealmMapper {
/**
* Get the realm mapping. Return {@code null} if the default realm should be used.
*
* @param principal the authentication principal (or {@code null} if none is known for this authentication)
* @param evidence the authentication evidence (or {@code null} if none is known for this authentication)
* @return the realm, or {@code null} if no particular realm matches the authentication information
*/
String getRealmMapping(Principal principal, Evidence evidence);
/**
* A realm mapper which always falls back to a default realm.
*/
RealmMapper DEFAULT_REALM_MAPPER = single(null);
/**
* Create a realm mapper that always maps to the given realm.
*
* @param realmName the realm name to return, or {@code null} if the default realm should be used
* @return the realm mapper returning {@code realmName}
*/
static RealmMapper single(String realmName) {
return (principal, evidence) -> realmName;
}
/**
* Create a realm mapper that matches when the given predicate matches.
*
* @param matchRule the match rule (must not be {@code null})
* @param realmName the realm name to return, or {@code null} to return the default realm
* @return the realm mapper (not {@code null})
*/
static RealmMapper matching(BiPredicate matchRule, String realmName) {
Assert.checkNotNullParam("matchRule", matchRule);
return (p, e) -> matchRule.test(p, e) ? realmName : null;
}
/**
* Create a realm mapper that matches when the given predicate matches the principal.
*
* @param matchRule the match rule (must not be {@code null})
* @param realmName the realm name to return, or {@code null} to return the default realm
* @return the realm mapper (not {@code null})
*/
static RealmMapper matchingPrincipal(Predicate matchRule, String realmName) {
Assert.checkNotNullParam("matchRule", matchRule);
return matching((p, e) -> matchRule.test(p), realmName);
}
/**
* Create a realm mapper that matches when the principal is of the given type.
*
* @param principalType the principal type class (must not be {@code null})
* @param realmName the realm name to return, or {@code null} to return the default realm
* @return the realm mapper (not {@code null})
*/
static RealmMapper matchingPrincipalType(Class principalType, String realmName) {
Assert.checkNotNullParam("principalType", principalType);
return matchingPrincipal(principalType::isInstance, realmName);
}
/**
* Create a realm mapper that matches when the given predicate matches the evidence.
*
* @param matchRule the match rule (must not be {@code null})
* @param realmName the realm name to return, or {@code null} to return the default realm
* @return the realm mapper (not {@code null})
*/
static RealmMapper matchingEvidence(Predicate matchRule, String realmName) {
Assert.checkNotNullParam("matchRule", matchRule);
return matching((p, e) -> matchRule.test(e), realmName);
}
/**
* Create a realm mapper that matches when the evidence is of the given type.
*
* @param evidenceType the evidence type class (must not be {@code null})
* @param realmName the realm name to return, or {@code null} to return the default realm
* @return the realm mapper (not {@code null})
*/
static RealmMapper matchingEvidenceType(Class evidenceType, String realmName) {
Assert.checkNotNullParam("evidenceType", evidenceType);
return matchingEvidence(evidenceType::isInstance, realmName);
}
/**
* Create an aggregate realm mapping strategy.
*
* @param mapper1 the first mapper to try (must not be {@code null})
* @param mapper2 the second mapper to try (must not be {@code null})
* @return an aggregated mapper (not {@code null})
*/
static RealmMapper aggregate(RealmMapper mapper1, RealmMapper mapper2) {
Assert.checkNotNullParam("mapper1", mapper1);
Assert.checkNotNullParam("mapper2", mapper2);
return (principal, evidence) -> {
String mapping = mapper1.getRealmMapping(principal, evidence);
if (mapping == null) mapping = mapper2.getRealmMapping(principal, evidence);
return mapping;
};
}
/**
* Create an aggregate realm mapping strategy.
*
* @param mappers the mappers to try (must not be {@code null})
* @return an aggregated mapper (not {@code null})
*/
static RealmMapper aggregate(RealmMapper... mappers) {
Assert.checkNotNullParam("mappers", mappers);
return (principal, evidence) -> {
for (RealmMapper mapper : mappers) if (mapper != null) {
String mapping = mapper.getRealmMapping(principal, evidence);
if (mapping != null) return mapping;
}
return null;
};
}
}
