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/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 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.jboss.modules.xml;
import static org.jboss.modules.xml.XmlPullParser.END_TAG;
import static org.jboss.modules.xml.XmlPullParser.FEATURE_PROCESS_NAMESPACES;
import static org.jboss.modules.xml.XmlPullParser.START_TAG;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.jboss.modules.ModuleLoader;
import org.jboss.modules.security.FactoryPermissionCollection;
import org.jboss.modules.security.ModularPermissionFactory;
import org.jboss.modules.security.PermissionFactory;
/**
* A simple parser for enterprise-style {@code permissions.xml} files.
*/
public final class PermissionsXmlParser {
private static final PermissionFactory[] NO_PERMISSION_FACTORIES = new PermissionFactory[0];
/**
* Parse the {@code permissions.xml} stream content.
*
* @param inputStream the input stream
* @param moduleLoader the module loader to load from
* @param moduleName the module name to load from
* @return the permission collection (not {@code null})
* @throws IOException if the input stream throws an exception
* @throws XmlPullParserException if the XML parser throws an exception
*/
public static FactoryPermissionCollection parsePermissionsXml(final InputStream inputStream, ModuleLoader moduleLoader, final String moduleName) throws XmlPullParserException, IOException {
final MXParser mxParser = new MXParser();
mxParser.setFeature(FEATURE_PROCESS_NAMESPACES, true);
mxParser.setInput(inputStream, null);
return parsePermissionsXml(mxParser, moduleLoader, moduleName);
}
/**
* Parse the {@code permissions.xml} content.
*
* @param reader the parser
* @param moduleLoader the module loader to load from
* @param moduleName the module name to load from
* @return the permission collection (not {@code null})
* @throws IOException if the input stream throws an exception
* @throws XmlPullParserException if the XML parser throws an exception
*/
public static FactoryPermissionCollection parsePermissionsXml(final XmlPullParser reader, ModuleLoader moduleLoader, final String moduleName) throws IOException, XmlPullParserException {
int eventType;
for (;;) {
eventType = reader.nextTag();
switch (eventType) {
case START_TAG: {
validateNamespace(reader);
switch (reader.getName()) {
case "permissions": {
return parsePermissionsElement(reader, moduleLoader, moduleName);
}
default: {
throw ModuleXmlParser.unexpectedContent(reader);
}
}
//break;
}
case END_TAG: {
return new FactoryPermissionCollection();
}
}
}
}
private static void validateNamespace(final XmlPullParser reader) throws XmlPullParserException {
final String namespace = reader.getNamespace();
if (namespace != null) {
switch (namespace) {
case "":
case "http://xmlns.jcp.org/xml/ns/javaee":
case "http://java.sun.com/xml/ns/javaee":
case "http://java.sun.com/xml/ns/j2ee":
case "http://java.sun.com/dtd":
return;
}
throw ModuleXmlParser.unexpectedContent(reader);
}
}
private static FactoryPermissionCollection parsePermissionsElement(final XmlPullParser reader, final ModuleLoader moduleLoader, final String moduleName) throws IOException, XmlPullParserException {
final int attributeCount = reader.getAttributeCount();
for (int i = 0; i < attributeCount; i ++) {
if (reader.getAttributeNamespace(i).isEmpty() && ! reader.getAttributeName(i).equals("version")) {
throw ModuleXmlParser.unknownAttribute(reader, i);
}
}
final List factories = new ArrayList<>();
int eventType;
for (;;) {
eventType = reader.nextTag();
switch (eventType) {
case START_TAG: {
validateNamespace(reader);
switch (reader.getName()) {
case "permission": {
factories.add(parsePermissionElement(reader, moduleLoader, moduleName));
break;
}
default: {
throw ModuleXmlParser.unexpectedContent(reader);
}
}
break;
}
case END_TAG: {
return new FactoryPermissionCollection(factories.toArray(NO_PERMISSION_FACTORIES));
}
}
}
}
private static PermissionFactory parsePermissionElement(final XmlPullParser reader, final ModuleLoader moduleLoader, final String moduleName) throws IOException, XmlPullParserException {
if (reader.getAttributeCount() > 0) throw ModuleXmlParser.unknownAttribute(reader, 0);
int eventType;
String className = null;
String name = null;
String actions = null;
for (;;) {
eventType = reader.nextTag();
switch (eventType) {
case START_TAG: {
validateNamespace(reader);
switch (reader.getName()) {
case "class-name": {
if (className != null) {
throw ModuleXmlParser.unexpectedContent(reader);
}
className = reader.nextText().trim();
break;
}
case "name": {
if (className == null || name != null || actions != null) {
throw ModuleXmlParser.unexpectedContent(reader);
}
name = PolicyExpander.expand(reader.nextText().trim());
break;
}
case "actions": {
if (className == null || actions != null) {
throw ModuleXmlParser.unexpectedContent(reader);
}
actions = reader.nextText().trim();
break;
}
default: {
throw ModuleXmlParser.unexpectedContent(reader);
}
}
break;
}
case END_TAG: {
return new ModularPermissionFactory(moduleLoader, moduleName, className, name, actions);
}
}
}
}
}
