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* Licensed to the University Corporation for Advanced Internet Development,
* Inc. (UCAID) under one or more contributor license agreements. See the
* NOTICE file distributed with this work for additional information regarding
* copyright ownership. The UCAID licenses this file to You 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.opensaml.saml2.metadata.provider;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.xml.namespace.QName;
import org.opensaml.saml2.common.SAML2Helper;
import org.opensaml.saml2.metadata.EntitiesDescriptor;
import org.opensaml.saml2.metadata.EntityDescriptor;
import org.opensaml.saml2.metadata.RoleDescriptor;
import org.opensaml.xml.XMLObject;
import org.opensaml.xml.io.Unmarshaller;
import org.opensaml.xml.io.UnmarshallingException;
import org.opensaml.xml.parse.ParserPool;
import org.opensaml.xml.util.DatatypeHelper;
import org.opensaml.xml.util.XMLHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
/** An abstract, base, implementation of a metadata provider. */
public abstract class AbstractMetadataProvider extends BaseMetadataProvider {
/** Class logger. */
private final Logger log = LoggerFactory.getLogger(AbstractMetadataProvider.class);
/** Whether the metadata provider has been initialized. */
private boolean initialized;
/**
* Whether problems during initialization should cause the provider to fail or go on without metadata. The
* assumption being that in most cases a provider will recover at some point in the future. Default: true.
*/
private boolean failFastInitialization;
/** Cache of entity IDs to their descriptors. */
private Map indexedDescriptors;
/** Pool of parsers used to process XML. */
private ParserPool parser;
/** Constructor. */
public AbstractMetadataProvider() {
super();
indexedDescriptors = new ConcurrentHashMap();
failFastInitialization = true;
initialized = false;
}
/** {@inheritDoc} */
public XMLObject getMetadata() throws MetadataProviderException {
if (!isInitialized()) {
throw new MetadataProviderException("Metadata provider has not been initialized");
}
XMLObject metadata = doGetMetadata();
if (metadata == null) {
log.debug("Metadata provider does not currently contain any metadata");
}
if (!isValid(metadata)) {
log.debug("Metadata document exists, but it is no longer valid");
return null;
}
return metadata;
}
/**
* Gets the metadata currently held by the provider. This method should not check if the provider is initialized, if
* the metadata is valid, etc. All of this is done by the invoker of this method.
*
* @return the metadata currently held by this provider or null if no metadata is available
*
* @throws MetadataProviderException thrown if there is a problem retrieving the metadata
*/
protected abstract XMLObject doGetMetadata() throws MetadataProviderException;
/** {@inheritDoc} */
public EntitiesDescriptor getEntitiesDescriptor(String name) throws MetadataProviderException {
if (!isInitialized()) {
throw new MetadataProviderException("Metadata provider has not been initialized");
}
if (DatatypeHelper.isEmpty(name)) {
log.debug("EntitiesDescriptor name was null or empty, skipping search for it");
return null;
}
EntitiesDescriptor descriptor = doGetEntitiesDescriptor(name);
if (descriptor == null) {
log.debug("Metadata document does not contain an EntitiesDescriptor with the name {}", name);
return null;
} else if (!isValid(descriptor)) {
log.debug("Metadata document contained an EntitiesDescriptor with the name {}, but it was no longer valid",
name);
return null;
}
return descriptor;
}
/**
* Gets the named EntitiesDescriptor from the metadata. This method should not check if the provider is initialized,
* if arguments are null, if metadata is valid, etc. All of this is done by the invoker of this method.
*
* @param name the name of the EntitiesDescriptor, never null
*
* @return the named EntitiesDescriptor or null if no such EntitiesDescriptor exists
*
* @throws MetadataProviderException thrown if there is a problem searching for the EntitiesDescriptor
*/
protected EntitiesDescriptor doGetEntitiesDescriptor(String name) throws MetadataProviderException {
XMLObject metadata = doGetMetadata();
if (metadata == null) {
log.debug("Metadata provider does not currently contain any metadata, unable to look for an EntitiesDescriptor with the name {}",
name);
return null;
}
EntitiesDescriptor descriptor = null;
if (metadata instanceof EntitiesDescriptor) {
descriptor = getEntitiesDescriptorByName(name, (EntitiesDescriptor) metadata);
}
return descriptor;
}
/** {@inheritDoc} */
public EntityDescriptor getEntityDescriptor(String entityID) throws MetadataProviderException {
if (!isInitialized()) {
throw new MetadataProviderException("Metadata provider has not been initialized");
}
if (DatatypeHelper.isEmpty(entityID)) {
log.debug("EntityDescriptor entityID was null or empty, skipping search for it");
return null;
}
EntityDescriptor descriptor = doGetEntityDescriptor(entityID);
if (descriptor == null) {
log.debug("Metadata document does not contain an EntityDescriptor with the ID {}", entityID);
return null;
} else if (!isValid(descriptor)) {
log.debug("Metadata document contained an EntityDescriptor with the ID {}, but it was no longer valid",
entityID);
return null;
}
return descriptor;
}
/**
* Gets the identified EntityDescriptor from the metadata. This method should not check if the provider is
* initialized, if arguments are null, if the metadata is valid, etc. All of this is done by the invoker of this
* method.
*
* @param entityID ID of the EntityDescriptor, never null
*
* @return the identified EntityDescriptor or null if no such EntityDescriptor exists
*
* @throws MetadataProviderException thrown if there is a problem searching for the EntityDescriptor
*/
protected EntityDescriptor doGetEntityDescriptor(String entityID) throws MetadataProviderException {
XMLObject metadata = doGetMetadata();
if (metadata == null) {
log.debug("Metadata document was empty, unable to look for an EntityDescriptor with the ID {}", entityID);
return null;
}
return getEntityDescriptorById(entityID, metadata);
}
/** {@inheritDoc} */
public List getRole(String entityID, QName roleName) throws MetadataProviderException {
if (!isInitialized()) {
throw new MetadataProviderException("Metadata provider has not been initialized");
}
if (DatatypeHelper.isEmpty(entityID)) {
log.debug("EntityDescriptor entityID was null or empty, skipping search for roles");
return null;
}
if (roleName == null) {
log.debug("Role descriptor name was null, skipping search for roles");
return null;
}
List roleDescriptors = doGetRole(entityID, roleName);
if (roleDescriptors == null || roleDescriptors.isEmpty()) {
log.debug("Entity descriptor {} did not contain any {} roles", entityID, roleName);
return null;
}
Iterator roleDescItr = roleDescriptors.iterator();
while (roleDescItr.hasNext()) {
if (!isValid(roleDescItr.next())) {
log.debug("Metadata document contained a role of type {} for entity {}, but it was invalid", roleName,
entityID);
roleDescItr.remove();
}
}
if (roleDescriptors.isEmpty()) {
log.debug("Entity descriptor {} did not contain any valid {} roles", entityID, roleName);
}
return roleDescriptors;
}
/**
* Gets the identified roles from an EntityDescriptor. This method should not check if the provider is initialized,
* if arguments are null, if the roles are valid, etc. All of this is done by the invoker of this method.
*
* @param entityID ID of the entity from which to retrieve the roles, never null
* @param roleName name of the roles to search for, never null
*
* @return the modifiable list of identified roles or an empty list if no roles exists
*
* @throws MetadataProviderException thrown if there is a problem searching for the roles
*/
protected List doGetRole(String entityID, QName roleName) throws MetadataProviderException {
EntityDescriptor entity = doGetEntityDescriptor(entityID);
if (entity == null) {
log.debug("Metadata document did not contain a descriptor for entity {}", entityID);
return Collections.emptyList();
}
List descriptors = entity.getRoleDescriptors(roleName);
if (descriptors != null && !descriptors.isEmpty()) {
return new ArrayList(descriptors);
}
return Collections.emptyList();
}
/** {@inheritDoc} */
public RoleDescriptor getRole(String entityID, QName roleName, String supportedProtocol)
throws MetadataProviderException {
if (!isInitialized()) {
throw new MetadataProviderException("Metadata provider has not been initialized");
}
if (DatatypeHelper.isEmpty(entityID)) {
log.debug("EntityDescriptor entityID was null or empty, skipping search for role");
return null;
}
if (roleName == null) {
log.debug("Role descriptor name was null, skipping search for role");
return null;
}
if (DatatypeHelper.isEmpty(supportedProtocol)) {
log.debug("Supported protocol was null, skipping search for role.");
return null;
}
RoleDescriptor role = doGetRole(entityID, roleName, supportedProtocol);
if (role == null) {
log.debug("Metadata document does not contain a role of type {} supporting protocol {} for entity {}",
new Object[] { roleName, supportedProtocol, entityID });
return null;
}
if (!isValid(role)) {
log
.debug(
"Metadata document contained a role of type {} supporting protocol {} for entity {}, but it was not longer valid",
new Object[] { roleName, supportedProtocol, entityID });
return null;
}
return role;
}
/**
* Gets the role which supports the given protocol.
*
* @param entityID ID of the entity from which to retrieve roles, never null
* @param roleName name of the role to search for, never null
* @param supportedProtocol protocol to search for, never null
*
* @return the role supporting the protocol or null if no such role exists
*
* @throws MetadataProviderException thrown if there is a problem search for the roles
*/
protected RoleDescriptor doGetRole(String entityID, QName roleName, String supportedProtocol)
throws MetadataProviderException {
List roles = doGetRole(entityID, roleName);
if (roles == null || roles.isEmpty()) {
log.debug("Metadata document did not contain any role descriptors of type {} for entity {}", roleName,
entityID);
return null;
}
Iterator rolesItr = roles.iterator();
RoleDescriptor role = null;
while (rolesItr.hasNext()) {
role = rolesItr.next();
if (role != null && role.isSupportedProtocol(supportedProtocol)) {
return role;
}
}
return null;
}
/**
* Gets whether this provider is initialized.
*
* @return whether this provider is initialized
*/
public boolean isInitialized() {
return initialized;
}
/**
* Sets whether this provider is initialized.
*
* @param isInitialized whether this provider is initialized
*/
protected void setInitialized(boolean isInitialized) {
initialized = isInitialized;
}
/**
* Gets whether problems during initialization should cause the provider to fail or go on without metadata. The
* assumption being that in most cases a provider will recover at some point in the future.
*
* @return whether problems during initialization should cause the provider to fail
*/
public boolean isFailFastInitialization() {
return failFastInitialization;
}
/**
* Sets whether problems during initialization should cause the provider to fail or go on without metadata. The
* assumption being that in most cases a provider will recover at some point in the future.
*
* @param failFast whether problems during initialization should cause the provider to fail
*/
public void setFailFastInitialization(boolean failFast) {
if (isInitialized()) {
return;
}
failFastInitialization = failFast;
}
/**
* Gets the pool of parsers to use to parse XML.
*
* @return pool of parsers to use to parse XML
*/
public ParserPool getParserPool() {
return parser;
}
/**
* Sets the pool of parsers to use to parse XML.
*
* @param pool pool of parsers to use to parse XML
*/
public void setParserPool(ParserPool pool) {
parser = pool;
}
/**
* Initializes this metadata provider. If called after the metadata provider has already been initialized this
* method simply returns.
*
* @throws MetadataProviderException thrown if there is a problem initializing the problem and fail fast
* Initialization is enabled
*/
public synchronized void initialize() throws MetadataProviderException {
if (initialized) {
return;
}
try {
doInitialization();
initialized = true;
} catch (MetadataProviderException e) {
if (failFastInitialization) {
log.error("Metadata provider failed to properly initialize, fail-fast=true, halting", e);
throw e;
} else {
log.error("Metadata provider failed to properly initialize, fail-fast=false, "
+ "continuing on in a degraded state", e);
initialized = true;
}
}
}
/** {@inheritDoc} */
public synchronized void destroy() {
initialized = false;
indexedDescriptors = Collections.emptyMap();
parser = null;
super.destroy();
}
/**
* Subclasses should override this method to perform any initialization logic necessary. Default implementation is a
* no-op.
*
* @throws MetadataProviderException thrown if there is a problem initializing the provider
*/
protected void doInitialization() throws MetadataProviderException {
}
/**
* Clears the entity ID to entity descriptor index.
*/
protected void clearDescriptorIndex() {
indexedDescriptors.clear();
}
/**
* Unmarshalls the metadata from the given stream. The stream is closed by this method and the returned metadata
* released its DOM representation.
*
* @param metadataInput the input reader to the metadata.
*
* @return the unmarshalled metadata
*
* @throws UnmarshallingException thrown if the metadata can no be unmarshalled
*/
protected XMLObject unmarshallMetadata(InputStream metadataInput) throws UnmarshallingException {
try {
log.trace("Parsing retrieved metadata into a DOM object");
Document mdDocument = parser.parse(metadataInput);
log.trace("Unmarshalling and caching metdata DOM");
Unmarshaller unmarshaller = unmarshallerFactory.getUnmarshaller(mdDocument.getDocumentElement());
if (unmarshaller == null) {
String msg ="No unmarshaller registered for document element " + XMLHelper
.getNodeQName(mdDocument.getDocumentElement());
log.error(msg);
throw new UnmarshallingException(msg);
}
XMLObject metadata = unmarshaller.unmarshall(mdDocument.getDocumentElement());
return metadata;
} catch (Exception e) {
throw new UnmarshallingException(e);
} finally {
try {
metadataInput.close();
} catch (IOException e) {
// ignore
}
}
}
/**
* Filters the given metadata.
*
* @param metadata the metadata to be filtered
*
* @throws FilterException thrown if there is an error filtering the metadata
*/
protected void filterMetadata(XMLObject metadata) throws FilterException {
if (getMetadataFilter() != null) {
log.debug("Applying metadata filter");
getMetadataFilter().doFilter(metadata);
}
}
/**
* Releases the DOM representation from the metadata object.
*
* @param metadata the metadata object
*/
protected void releaseMetadataDOM(XMLObject metadata) {
if (metadata != null) {
metadata.releaseDOM();
metadata.releaseChildrenDOM(true);
}
}
/**
* Gets the EntityDescriptor with the given ID from the cached metadata.
*
* @param entityID the ID of the entity to get the descriptor for
* @param metadata metadata associated with the entity
*
* @return the EntityDescriptor
*/
protected EntityDescriptor getEntityDescriptorById(String entityID, XMLObject metadata) {
EntityDescriptor descriptor = null;
log.debug("Searching for entity descriptor with an entity ID of {}", entityID);
if (entityID != null && indexedDescriptors.containsKey(entityID)) {
descriptor = indexedDescriptors.get(entityID);
if (isValid(descriptor)) {
log.trace("Entity descriptor for the ID {} was found in index cache, returning", entityID);
return descriptor;
} else {
indexedDescriptors.remove(descriptor);
}
}
if (metadata != null) {
if (metadata instanceof EntityDescriptor) {
log.trace("Metadata root is an entity descriptor, checking if it's the one we're looking for.");
descriptor = (EntityDescriptor) metadata;
if (!DatatypeHelper.safeEquals(descriptor.getEntityID(), entityID)) {
// skip this one, it isn't what we're looking for
descriptor = null;
} else if (!isValid(descriptor)) {
log.trace("Found entity descriptor for entity with ID {} but it is no longer valid, skipping it.",
entityID);
descriptor = null;
}
} else {
log.trace("Metadata was an EntitiesDescriptor, checking if any of its descendant EntityDescriptor "
+ "elements is the one we're looking for.");
if (metadata instanceof EntitiesDescriptor) {
descriptor = getEntityDescriptorById(entityID, (EntitiesDescriptor) metadata);
}
}
}
if (descriptor != null) {
log.trace("Located entity descriptor, creating an index to it for faster lookups");
indexedDescriptors.put(entityID, descriptor);
}
return descriptor;
}
/**
* Gets the entity descriptor with the given ID that is a descendant of the given entities descriptor.
*
* @param entityID the ID of the entity whose descriptor is to be fetched
* @param descriptor the entities descriptor
*
* @return the entity descriptor
*/
protected EntityDescriptor getEntityDescriptorById(String entityID, EntitiesDescriptor descriptor) {
log.trace("Checking to see if EntitiesDescriptor {} contains the requested descriptor", descriptor.getName());
List entityDescriptors = descriptor.getEntityDescriptors();
if (entityDescriptors != null && !entityDescriptors.isEmpty()) {
for (EntityDescriptor entityDescriptor : entityDescriptors) {
log.trace("Checking entity descriptor with entity ID {}", entityDescriptor.getEntityID());
if (DatatypeHelper.safeEquals(entityDescriptor.getEntityID(), entityID) && isValid(entityDescriptor)) {
return entityDescriptor;
}
}
}
log.trace("Checking to see if any of the child entities descriptors contains the entity descriptor requested");
EntityDescriptor entityDescriptor;
List entitiesDescriptors = descriptor.getEntitiesDescriptors();
if (entitiesDescriptors != null && !entitiesDescriptors.isEmpty()) {
for (EntitiesDescriptor entitiesDescriptor : descriptor.getEntitiesDescriptors()) {
entityDescriptor = getEntityDescriptorById(entityID, entitiesDescriptor);
if (entityDescriptor != null) {
// We don't need to check for validity because getEntityDescriptorById only returns a valid
// descriptor
return entityDescriptor;
}
}
}
return null;
}
/**
* Gets the entities descriptor with the given name.
*
* @param name name of the entities descriptor
* @param rootDescriptor the root descriptor to search in
*
* @return the EntitiesDescriptor with the given name
*/
protected EntitiesDescriptor getEntitiesDescriptorByName(String name, EntitiesDescriptor rootDescriptor) {
EntitiesDescriptor descriptor = null;
if (DatatypeHelper.safeEquals(name, rootDescriptor.getName()) && isValid(rootDescriptor)) {
descriptor = rootDescriptor;
} else {
List childDescriptors = rootDescriptor.getEntitiesDescriptors();
if (childDescriptors == null || childDescriptors.isEmpty()) {
return null;
}
for (EntitiesDescriptor childDescriptor : childDescriptors) {
childDescriptor = getEntitiesDescriptorByName(name, childDescriptor);
if (childDescriptor != null) {
descriptor = childDescriptor;
}
}
}
return descriptor;
}
/**
* Returns whether the given descriptor is valid. If valid metadata is not required this method always returns true.
*
* @param descriptor the descriptor to check
*
* @return true if valid metadata is not required or the given descriptor is valid, false otherwise
*/
protected boolean isValid(XMLObject descriptor) {
if (descriptor == null) {
return false;
}
if (!requireValidMetadata()) {
return true;
}
return SAML2Helper.isValid(descriptor);
}
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