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LinkTargetFinder.java
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LinkTargetFinder.java
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/*
* Copyright (c) 2020 Evolveum and contributors
*
* This work is dual-licensed under the Apache License 2.0
* and European Union Public License. See LICENSE file for details.
*/
package com.evolveum.midpoint.model.impl.lens.projector.policy;
import static java.util.Collections.emptySet;
import static org.apache.commons.lang3.BooleanUtils.isTrue;
import static org.apache.commons.lang3.ObjectUtils.defaultIfNull;
import static com.evolveum.midpoint.schema.util.ObjectTypeUtil.asObjectable;
import static com.evolveum.midpoint.schema.util.ObjectTypeUtil.objectReferenceListToPrismReferenceValues;
import java.util.*;
import java.util.stream.Collectors;
import javax.xml.namespace.QName;
import com.evolveum.midpoint.util.exception.*;
import com.evolveum.midpoint.util.logging.LoggingUtils;
import org.apache.commons.collections4.SetUtils;
import org.jetbrains.annotations.NotNull;
import com.evolveum.midpoint.model.impl.lens.EvaluatedPolicyRuleImpl;
import com.evolveum.midpoint.model.impl.lens.LensContext;
import com.evolveum.midpoint.model.impl.lens.assignments.EvaluatedAssignmentImpl;
import com.evolveum.midpoint.model.impl.lens.assignments.EvaluatedAssignmentTargetImpl;
import com.evolveum.midpoint.prism.PrismObject;
import com.evolveum.midpoint.prism.PrismReferenceValue;
import com.evolveum.midpoint.schema.result.OperationResult;
import com.evolveum.midpoint.util.logging.Trace;
import com.evolveum.midpoint.util.logging.TraceManager;
import com.evolveum.midpoint.xml.ns._public.common.common_3.*;
/**
* Finds link targets based on a collection of selectors.
*/
class LinkTargetFinder implements AutoCloseable {
private static final Trace LOGGER = TraceManager.getTrace(LinkTargetFinder.class);
private static final String OP_GET_TARGETS = LinkTargetFinder.class.getName() + ".getTargets";
@NotNull private final PolicyRuleScriptExecutor beans;
@NotNull private final LensContext<?> context;
@NotNull private final EvaluatedPolicyRuleImpl rule;
@NotNull private final OperationResult result;
LinkTargetFinder(@NotNull PolicyRuleScriptExecutor policyRuleScriptExecutor,
@NotNull LensContext<?> context, @NotNull EvaluatedPolicyRuleImpl rule,
@NotNull OperationResult parentResult) {
this.beans = policyRuleScriptExecutor;
this.context = context;
this.rule = rule;
this.result = parentResult.createMinorSubresult(OP_GET_TARGETS);
}
List<PrismObject<? extends ObjectType>> getTargets(LinkTargetObjectSelectorType selector) {
try {
return getTargetsInternal(selector);
} catch (Throwable t) {
result.recordFatalError(t);
throw t;
}
}
private List<PrismObject<? extends ObjectType>> getTargetsInternal(LinkTargetObjectSelectorType selector) {
LOGGER.trace("Selecting matching link targets for {} with rule={}", selector, rule);
// We must create new set because we will remove links from it later.
Set<PrismReferenceValue> links = new HashSet<>(getLinksInChangeSituation(selector));
LOGGER.trace("Links matching change situation: {}", links);
if (!selector.getRelation().isEmpty()) {
applyRelationFilter(links, selector.getRelation());
LOGGER.trace("Links matching also relation(s): {}", links);
}
if (isTrue(selector.isMatchesRuleAssignment())) {
applyMatchingRuleAssignment(links);
LOGGER.trace("Links matching also policy rule assignment: {}", links);
}
if (isTrue(selector.isMatchesConstraint())) {
applyMatchingPolicyRuleConstraints(links);
LOGGER.trace("Links matching also policy constraints: {}", links);
}
if (selector.getType() != null) {
// This is just to avoid resolving objects with non-matching type
applyObjectType(links, selector.getType());
LOGGER.trace("Links matching also object type: {}", links);
}
Collection<PrismObject<? extends ObjectType>> resolvedObjects = resolveLinks(links);
List<PrismObject<? extends ObjectType>> matchingObjects = getMatchingObjects(resolvedObjects, selector);
LOGGER.trace("Final matching objects: {}", matchingObjects);
return matchingObjects;
}
private List<PrismObject<? extends ObjectType>> getMatchingObjects(Collection<PrismObject<? extends ObjectType>> objects,
ObjectSelectorType selector) {
List<PrismObject<? extends ObjectType>> matching = new ArrayList<>();
for (PrismObject<? extends ObjectType> object : objects) {
try {
if (beans.repositoryService.selectorMatches(selector, object, null, LOGGER, "")) {
matching.add(object);
}
} catch (CommonException e) {
LoggingUtils.logUnexpectedException(LOGGER, "Couldn't match link target {} for {} when filtering link targets", e,
object, context.getFocusContextRequired().getObjectAny());
}
}
return matching;
}
private Collection<PrismObject<? extends ObjectType>> resolveLinks(Set<PrismReferenceValue> links) {
Map<String, PrismObject<? extends ObjectType>> objects = new HashMap<>();
for (PrismReferenceValue link : links) {
String oid = link.getOid();
if (!objects.containsKey(oid)) {
try {
Class<? extends ObjectType> clazz = getClassForType(link.getTargetType());
objects.put(oid, beans.repositoryService.getObject(clazz, oid, null, result));
} catch (SchemaException | ObjectNotFoundException e) {
LoggingUtils.logUnexpectedException(LOGGER, "Couldn't resolve reference {} in {} when applying script on link targets",
e, link, context.getFocusContextRequired().getObjectAny());
}
}
}
return objects.values();
}
private void applyObjectType(Set<PrismReferenceValue> links, QName type) {
Class<?> clazz = getClassForType(type);
links.removeIf(link -> beans.prismContext.getSchemaRegistry().isAssignableFrom(clazz, link.getTargetType()));
}
@NotNull
private Class<? extends ObjectType> getClassForType(QName type) {
Class<?> clazz = beans.prismContext.getSchemaRegistry().getCompileTimeClass(type);
if (clazz == null) {
throw new IllegalStateException("Unknown type " + type);
} else if (!ObjectType.class.isAssignableFrom(clazz)) {
throw new IllegalStateException("Type " + type + " is not an ObjectType, it is " + clazz);
} else {
//noinspection unchecked
return (Class<? extends ObjectType>) clazz;
}
}
private void applyMatchingRuleAssignment(Set<PrismReferenceValue> links) {
EvaluatedAssignmentImpl<?> evaluatedAssignment = rule.getEvaluatedAssignment();
if (evaluatedAssignment == null) {
throw new IllegalStateException("'matchesRuleAssignment' filter is selected but there's no evaluated assignment"
+ " known for policy rule {}" + rule);
}
Set<String> oids = evaluatedAssignment.getRoles().stream()
.filter(EvaluatedAssignmentTargetImpl::appliesToFocus)
.map(EvaluatedAssignmentTargetImpl::getOid)
.collect(Collectors.toSet());
links.removeIf(link -> !oids.contains(link.getOid()));
}
private void applyMatchingPolicyRuleConstraints(Set<PrismReferenceValue> links) {
Set<String> oids = rule.getAllTriggers().stream()
.flatMap(trigger -> trigger.getTargetObjects().stream())
.map(PrismObject::getOid)
.collect(Collectors.toSet());
links.removeIf(link -> !oids.contains(link.getOid()));
}
private void applyRelationFilter(Set<PrismReferenceValue> links, List<QName> relations) {
links.removeIf(link -> !beans.prismContext.relationMatches(relations, link.getRelation()));
}
@NotNull
private Set<PrismReferenceValue> getLinksInChangeSituation(LinkTargetObjectSelectorType selector) {
switch (defaultIfNull(selector.getChangeSituation(), LinkChangeSituationType.ALWAYS)) {
case ALWAYS:
return SetUtils.union(getLinkedOld(), getLinkedNew());
case ADDED:
return SetUtils.difference(getLinkedNew(), getLinkedOld());
case REMOVED:
return SetUtils.difference(getLinkedOld(), getLinkedNew());
case UNCHANGED:
return SetUtils.intersection(getLinkedOld(), getLinkedNew());
case CHANGED:
return SetUtils.disjunction(getLinkedOld(), getLinkedNew());
case IN_NEW:
return getLinkedNew();
case IN_OLD:
return getLinkedOld();
default:
throw new AssertionError(selector.getChangeSituation());
}
}
private Set<PrismReferenceValue> getLinkedOld() {
ObjectType objectOld = asObjectable(context.getFocusContextRequired().getObjectOld());
return objectOld instanceof AssignmentHolderType ?
new HashSet<>(objectReferenceListToPrismReferenceValues(((AssignmentHolderType) objectOld).getRoleMembershipRef())) :
emptySet();
}
private Set<PrismReferenceValue> getLinkedNew() {
ObjectType objectNew = asObjectable(context.getFocusContextRequired().getObjectNew());
return objectNew instanceof AssignmentHolderType ?
new HashSet<>(objectReferenceListToPrismReferenceValues(((AssignmentHolderType) objectNew).getRoleMembershipRef())) :
emptySet();
}
@Override
public void close() {
result.computeStatusIfUnknown();
}
}